LTC2500-32 - 32-Bit Oversampling ADC with Configurable Digital Filter

54 Pages·2017·1.64 MB·English

by  Analog Devices

LTC2500-32
32-Bit Oversampling ADC
with Configurable Digital Filter
FEATURES DESCRIPTION
n ±0.5ppm INL (Typ) The LTC®2500-32 is a low noise, low power, high perfor-
n 104dB SNR (Typ) at 1Msps mance 32-bit ADC with an integrated configurable digital
n 148dB Dynamic Range (Typ) at 61sps filter. Operating from a single 2.5V supply, the LTC2500-32
n Guaranteed 32-Bit No Missing Codes features a fully differential input range up to ±V , with
REF
n Configurable Digital Filter with Synchronization VREF ranging from 2.5V to 5.1V. The LTC2500-32 supports
n Relaxed Anti-Aliasing Filter Requirements a wide common mode range from 0V to VREF simplifying
n Dual Output 32-Bit SAR ADC analog signal conditioning requirements.
n 32-Bit Digitally Filtered Low Noise Output
The LTC2500-32 simultaneously provides two output
n 24-Bit Differential + 7-Bit Common Mode 1Msps
codes: (1) a 32-bit digitally filtered high precision low
Output with Overrange Detection
noise code, and (2) a 32-bit no latency composite code.
n Wide Input Common Mode Range
The configurable digital filter reduces measurement noise
n Guaranteed Operation to 85°C
by lowpass filtering and downsampling the stream of data
n 1.8V to 5V SPI-Compatible Serial I/O
from the SAR ADC core, giving the 32-bit filtered output
n Low Power: 24mW at 1Msps code. The 32-bit composite code consists of an overrange
n 24-Lead 7mm × 4mm DFN Packages detection bit, a 24-bit code representing the differential
input voltage and a 7-bit code representing the common
APPLICATIONS mode input voltage. The 32-bit composite code is available
each conversion cycle, with no cycle of latency.
n Seismology
The digital filter is highly configurable through the SPI-
n Energy Exploration
compatible interface and features many distinct filter types
n Automatic Test Equipment
that suit a variety of applications. The digital lowpass filter
n High Accuracy Instrumentation
relaxes the requirements for analog anti-aliasing. Multiple
LTC2500-32 devices can be easily synchronized using
the SYNC pin.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. patents, including 7705765, 7961132, 8319673, 8576104, 8810443, 9231611,
9054727, 9331709 and patents pending.
TYPICAL APPLICATION
Integral Nonlinearity vs
Output Code
2.5V 1.8V TO 5.1V
2.0
10µF 0.1µF
1.5
IN+, IN–
VVRR0EEVFFABRIBPIOTRLAARRY VVRR0EEVFFDIUFFNEIPROENLATRIAL IN+ S3AC2RO- VBRADIEDTDC LTC25W0P0IR-D3OE2LGBOFARWINLAT DMPE AMRDSIASGB ITLAEOL V DD32-BIT MSBRSDUDCDCSOSKRLLDYAAAKLI SCALOMCPKLE NL ERROR (ppm)–010...5005
IN– 24-BIT RDLB I–1.0
0V 0V SDOB
REF GND SCKB –1.5
WDIIFDFEE RINEPNUTTIA CLO IMNPMUOTNS MINO+D/INE –R WANITGHE 2.5V TO 5.1V 250032 TA01 –2.0
47µF –5 –2.5 0 2.5 5
(X7R, 1210 SIZE) INPUT VOLTAGE (V)
250032 TA01b
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LTC2500-32
TABLE OF CONTENTS
Features ............................................................................................................................1
Applications .......................................................................................................................1
Typical Application ...............................................................................................................1
Description.........................................................................................................................1
Absolute Maximum Ratings .....................................................................................................3
Order Information .................................................................................................................3
Pin Configuration .................................................................................................................3
Electrical Characteristics ........................................................................................................4
Converter Characteristics for Filtered Output (SDOA) .......................................................................4
Dynamic Accuracy for Filtered Output (SDOA) ...............................................................................4
Converter Characteristics for No latency Output (SDOB) ...................................................................4
Dynamic Accuracy for No Latency Output (SDOB) ...........................................................................5
Reference Input ...................................................................................................................5
Digital Inputs and Digital Outputs ..............................................................................................6
Power Requirements .............................................................................................................6
ADC Timing Characteristics .....................................................................................................6
Typical Performance Characteristics ..........................................................................................8
Pin Functions .....................................................................................................................11
Functional Block Diagram ......................................................................................................12
Timing Diagram ..................................................................................................................12
Applications Information .......................................................................................................13
Overview ...............................................................................................................................................................13
Converter Operation ..............................................................................................................................................13
Transfer Function ..................................................................................................................................................13
Analog Input .........................................................................................................................................................13
Input Drive Circuits ...............................................................................................................................................14
ADC Reference ......................................................................................................................................................21
Dynamic Performance ..........................................................................................................................................22
Power Considerations ...........................................................................................................................................22
Timing and Control ...............................................................................................................................................23
Decimation Filters .................................................................................................................................................23
Digital Filter Types ................................................................................................................................................26
Digital Interface ....................................................................................................................................................33
Preset Filter Modes ...............................................................................................................................................36
Filtered Output Data ..............................................................................................................................................36
No Latency Output Data ........................................................................................................................................45
Board Layout .....................................................................................................................51
Package Description ............................................................................................................52
Revision History .................................................................................................................53
Typical Application ..............................................................................................................54
Related Parts .....................................................................................................................54
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LTC2500-32
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Notes 1, 2)
Supply Voltage (V ) ...............................................2.8V
DD
Supply Voltage (OV ) ................................................6V
DD
TOP VIEW
Reference Input (REF) .................................................6V
Analog Input Voltage (Note 3)
RDLA 1 24 GND
IN+, IN– .........................(GND – 0.3V) to (REF + 0.3V) RDLB 2 23 GND
Digital Input Voltage VDD 3 22 OVDD
GND 4 21 BUSY
(Note 3) ..........................(GND – 0.3V) to (OV + 0.3V) IN+ 5 20 SDOB
DD IN– 6 25 19 SCKB
Digital Output Voltage GND 7 GND 18 SCKA
(Note 3) ..........................(GND – 0.3V) to (OV + 0.3V) REF 8 17 SDOA
DD REF 9 16 SDI
Power Dissipation ..............................................500mW PRE 10 15 DRL
GND 11 14 SYNC
Operating Temperature Range
GND 12 13 MCLK
LTC2500C-32 ...........................................0°C to 70°C
LTC2500I-32 ........................................–40°C to 85°C
DKD PACKAGE
Storage Temperature Range ..................–65°C to 150°C 24-LEAD (7mm × 4mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
http://www.linear.com/product/LTC2500-32#orderinfo
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2500CDKD-32#PBF LTC2500CDKD-32#TRPBF 250032 24-Lead (7mm × 4mm) Plastic DFN 0°C to 70°C
LTC2500IDKD-32#PBF LTC2500IDKD-32#TRPBF 250032 24-Lead (7mm × 4mm) Plastic DFN –40°C to 85°C
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
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LTC2500-32
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. (Note 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V + Absolute Input Range (IN+) (Note 5) l 0 V V
IN REF
V – Absolute Input Range (IN–) (Note 5) l 0 V V
IN REF
V + – V – Input Differential Voltage Range V = V + – V – l −V V V
IN IN IN IN IN REF REF
V Common Mode Input Range l 0 V V
CM REF
I Analog Input Leakage Current 10 nA
IN
C Analog Input Capacitance Sample Mode 45 pF
IN
Hold Mode 5 pF
CMRR Input Common Mode Rejection Ratio No Latency Output 128 dB
V + = V – = 4.5V , 2kHz Sine
IN IN P-P
CONVERTER CHARACTERISTICS FOR FILTERED OUTPUT (SDOA)
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C.
A
(Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution l 32 Bits
No Missing Codes l 32 Bits
Transition Noise (Note 6) See Table 2
DF Down-Sampling Factor 4 16384
INL Integral Linearity Error (Notes 7, 8) l –2 ±0.5 2 ppm
ZSE Zero-Scale Error (Notes 7, 9) l 13 0 13 ppm
Zero-Scale Error Drift (Note 7) ±7 ppb/°C
FSE Full-Scale Error (Notes 7, 9) l –100 ±10 100 ppm
Full-Scale Error Drift (Note 7) ±0.05 ppm/°C
DYNAMIC ACCURACY FOR FILTERED OUTPUT (SDOA)
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C and
A
ssinc filter. (Notes 4, 9)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DR Dynamic Range DF = 4 l 110 116 dB
IN+ = IN– = V , V = 5V, DF = 64 l 122 128 dB
CM REF
IN+ = IN– = V , V = 5V, DF = 1024 l 129.5 138 dB
CM REF
CONVERTER CHARACTERISTICS FOR NO LATENCY OUTPUT (SDOB)
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C.
A
(Notes 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution:
Differential l 24 Bits
Common Mode l 7 Bits
No Missing Codes:
Differential l 24 Bits
Common Mode l 7 Bits
Transition Noise:
Differential 2.3 ppm
RMS
Common Mode 1 LSB
RMS
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LTC2500-32
CONVERTER CHARACTERISTICS FOR NO LATENCY OUTPUT (SDOB)
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C.
A
(Notes 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
INL Integral Linearity Error:
Differential l –2 ±0.5 2 ppm
Common Mode 7-Bit Output ±0.1 LSB
ZSE Zero-Scale Error:
Differential l –13 0 13 ppm
Common Mode 7-Bit Output ±1 LSB
Zero-Scale Error Drift:
Differential ±7 ppb/°C
FSE Full-Scale Error:
Differential l –100 ±10 100 ppm
Common Mode 7-Bit Output ±1 LSB
Full-Scale Error Drift:
Differential ±0.05 ppm/°C
DYNAMIC ACCURACY FOR NO LATENCY OUTPUT (SDOB)
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C and
A
A = –1dBFS. The specifications are for the differential output (Notes 4, 10)
IN
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SINAD Signal-to-(Noise + Distortion) Ratio f = 2kHz, V = 5V l 100 104 dB
IN REF
SNR Signal-to-Noise Ratio f = 2kHz, V = 5V l 100 104 dB
IN REF
THD Total Harmonic Distortion f = 2kHz, V = 5V l –120 –114 dB
IN REF
f = 2kHz, V = 2.5V –120 –113 dB
IN REF
SFDR Spurious Free Dynamic Range f = 2kHz, V = 5V l 115 128 dB
IN REF
–3dB Input Linear Bandwidth 34 MHz
Aperture Delay 500 ps
Aperture Jitter 4 ps
RMS
Transient Response Full-Scale Step 125 ns
REFERENCE INPUT
The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T = 25°C. (Notes 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V Reference Voltage (Note 5) l 2.5 5.1 V
REF
I Reference Input Current (Note 11) l 0.9 1.4 mA
REF
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LTC2500-32
DIGITAL INPUTS AND DIGITAL OUTPUTS
The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T = 25°C. (Note 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V High Level Input Voltage l 0.8 • 0V V
IH DD
V Low Level Input Voltage l 0.2 • OV V
IL DD
I Digital Input Current V = 0V to OV l –10 10 µA
IN IN DD
C Digital Input Capacitance 5 pF
IN
V High Level Output Voltage I = –500 µA l OV – 0.2 V
OH O DD
V Low Level Output Voltage I = 500 µA l 0.2 V
OL O
I Hi-Z Output Leakage Current V = 0V to OV l –10 10 µA
OZ OUT DD
I Output Source Current V = 0V –10 mA
SOURCE OUT
I Output Sink Current V = OV 10 mA
SINK OUT DD
POWER REQUIREMENTS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T = 25°C. (Note 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V Supply Voltage l 2.375 2.5 2.625 V
DD
O Supply Voltage l 1.71 5.25 V
VDD
I Supply Current 1Msps Sample Rate l 9.5 14 mA
VDD
I Supply Current 1Msps Sample Rate (C = 20pF) 1 mA
OVDD L
I Power Down Mode Conversion Done (I + I + I ) l 6 350 µA
PD VDD OVDD REF
P Power Dissipation 1Msps Sample Rate (I ) 24 35 mW
D VDD
Power Down Mode Conversion Done (I + I + I ) 15 875 µW
VDD OVDD REF
ADC TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. (Note 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f Maximum Sampling Frequency l 1 Msps
SMPL
f Output Data Rate at SDOA l 250 ksps
DRA
f Output Data Rate at SDOB l 1 Msps
DRB
t Conversion Time l 600 660 ns
CONV
t Acquisition Time t = t – t – t (Note 12) l 327 ns
ACQ ACQ CYC CONV BUSYLH
t Time Between Conversions l 1000 ns
CYC
t Conversion High Time l 20 ns
MCLKH
t Minimum Low Time for MCLK (Note 13) l 20 ns
MCLKL
tBUSYLH MCLK to BUSY Delay CL = 20pF l 13 ns
tQUIET SCKA, SCKB Quiet Time from MCLK (Note 12) l 10 ns
t SCKA Period (Notes 13, 14) l 10 ns
SCKA
t SCKA High Time l 4 ns
SCKAH
t SCKA Low Time l 4 ns
SCKAL
tSSDISCKA SD1 Setup Time from SCKA (Note 13) l 4 ns
tHSDISCKA SD1 Hold Time from SCKA (Note 13) l 1 ns
tDSDOA SDOA Data Valid Delay from SCKA CL = 20pF, OVDD = 5.25V l 8.5 ns
C = 20pF, OV = 2.5V l 8.5 ns
L DD
C = 20pF, OV = 1.71V l 9.5 ns
L DD
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LTC2500-32
ADC TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. (Note 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t SDOA Data Remains Valid Delay from C = 20pF (Note 12) l 1 ns
HSDOA L
SCKA
tDSDOADRLL SDOA Data Valid Delay from DRL CL = 20pF (Note 12) l 5 ns
tENA Bus Enable Time After RDLA (Note 13) l 16 ns
tDISA Bus Relinquish Time After RDLA (Note 13) l 13 ns
t SCKB Period (Notes 13, 14) l 10 ns
SCKB
t SCKB High Time l 4 ns
SCKBH
t SCKB Low Time l 4 ns
SCKBL
tDSDOB SDOB Data Valid Delay from SCKB CL = 20pF, OVDD = 5.25V l 8.5 ns
C = 20pF, OV = 2.5V l 8.5 ns
L DD
C = 20pF, OV = 1.71V l 9.5 ns
L DD
t SDOB Data Remains Valid Delay from C = 20pF (Note 12) l 1 ns
HSDOB L
SCKB
tDSDOBBUSYL SDOB Data Valid Delay from BUSY CL = 20pF (Note 12) l 5 ns
tENB Bus Enable Time After RDLB (Note 13) l 16 ns
tDISB Bus Relinquish Time After RDLB (Note 13) l 13 ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 8: Integral nonlinearity is defined as the deviation of a code from a
may cause permanent damage to the device. Exposure to any Absolute straight line passing through the actual endpoints of the transfer curve.
Maximum Rating condition for extended periods may affect device The deviation is measured from the center of the quantization band.
reliability and lifetime. Note 9: Bipolar zero-scale error is the offset voltage measured from
Note 2: All voltage values are with respect to ground. –0.5LSB when the output code flickers between 0000 0000 0000 0000
Note 3: When these pin voltages are taken below ground or above REF or 0000 0000 0000 0000 and 1111 1111 1111 1111 1111 1111 1111
O , they will be clamped by internal diodes. This product can handle 1111. Full-scale bipolar error is the worst-case of –FS or +FS untrimmed
VDD
input currents up to 100mA below ground or above REF or OV without deviation from ideal first and last code transitions and includes the effect
DD
latchup. of offset error.
Note 4: V = 2.5V, OV = 2.5V, REF = 5V, V = 2.5V, f = 1MHz. Note 10: All specifications in dB are referred to a full-scale ±5V input with
DD DD CM SMPL
Note 5: Recommended operating conditions. a 5V reference voltage.
Note 6: Transition noise is defined as the noise level of the ADC with IN+ Note 11: fSMPL = 1MHz, IREF varies proportionally with sample rate.
and IN– shorted. Note 12: Guaranteed by design, not subject to test.
Note 7: The DC specifications at SDOA are measured and guaranteed at Note 13: Parameter tested and guaranteed at OV = 1.71V, OV = 2.5V
DD DD
SDOB. The operation of the digital filters is tested separately to guarantee and OV = 5.25V.
DD
the same DC specifications at SDOA.
Note 14: t , t of 10ns maximum allows a shift clock frequency up
SCKA SCKB
to 100MHz for rising edge capture.
0.8 • OVDD tWIDTH
0.2 • OVDD
tDELAY tDELAY 50% 50%
0.8 • OVDD 0.8 • OVDD 250032 F01
0.2 • OVDD 0.2 • OVDD
Figure 1. Voltage Levels for Timing Specifications
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LTC2500-32
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, V = 2.5V, OV = 2.5V, V = 2.5V,
A DD DD CM
REF = 5V, f = 1Msps, no latency output, unless otherwise noted.
SMPL
Integral Nonlinearity vs Input Differential Nonlinearity vs Input
Voltage Voltage DC Histogram
2.0 1.0 10000
σ = 2.4ppm
0.8
1.5
0.6 8000
1.0
0.4
m)
ERROR (pp 0.05 DNL (LSB) –000...202 COUNTS 46000000
L –0.5
N
I –0.4
–1.0
–0.6 2000
–1.5
–0.8
–2.0 –1.0 0
–5 –2.5 0 2.5 5 –5 –2.5 0 2.5 5 –15 –7.5 0 7.5 15
INPUT VOLTAGE (V) INPUT VOLTAGE (V) OUTPUT CODE (ppm)
250032 G01 250032 G02 250032 G03
DC Histogram Filtered Output, DC Histogram Filtered Output, DC Histogram Filtered Output,
DF = 4, SSINC Filter DF = 64, SSINC Filter DF = 1024, SSINC Filter
1000 1000 1000
σ = 0.7ppm σ = 0.17ppm σ = 0.049ppm
800 800 800
600 600 600
S S S
T T T
N N N
U U U
O O O
C 400 C 400 C 400
200 200 200
0 0 0
–4 –3 –2 –1 0 1 2 3 4 –1 –0.5 0 0.5 1 –0.4 –0.2 0 0.2 0.4
OUTPUT CODE (ppm) OUTPUT CODE (ppm) OUTPUT CODE (ppm)
250032 G04 250032 G05 250032 G06
DC Histogram Filtered Output, 128k Point FFT Filtered Output,
DF = 16384, SSINC Filter 16k Point FFT f = 2kHz f = 2kHz, DF = 4, SSINC Filter
IN IN
1000 0 0
σ = 0.018ppm SNR = 104dB SNR = 116dB
–20 THD = –120dB –20 THD = –120dB
SINAD = 104dB SINAD = 114dB
800 –40 SFDR = 121dB –40 SFDR = 121dB
S) –60 S) –60
F F
COUNTS 460000 LITUDE (dB–1–0800 LITUDE (dB–1–0800
P P
M–120 M–120
A A
200 –140 –140
–160 –160
0 –180 –180
–0.4 –0.2 0 0.2 0.4 0 125 250 375 500 0 31 62 94 125
OUTPUT CODE (ppm) FREQUENCY (kHz) FREQUENCY (kHz)
250032 G07 250032 G08 250032 G09
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LTC2500-32
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, V = 2.5V, OV = 2.5V, V = 2.5V,
A DD DD CM
REF = 5V, f = 1Msps, no latency output, unless otherwise noted.
SMPL
128k Point FFT Filtered Output, 128k Point FFT Filtered Output, 8k Point FFT Filtered Output,
f = 200Hz, DF = 64, SSINC Filter f = 100Hz, DF = 1024, SSINC Filter f = 11Hz, DF = 16384, SSINC Filter
IN IN IN
0 0 0
DR = 128dB DR = 137dB DR = 149dB
–20 –20 –20
–40 –40 –40
S) –60 S) –60 S) –60
DE (dBF–1–0800 DE (dBF–1–0800 DE (dBF–1–0800
U U U
PLIT–120 PLIT–120 PLIT–120
M M M
A–140 A–140 A–140
–160 –160 –160
–180 –180 –180
–200 –200 –200
0 2 4 6 8 0 122 244 366 488 0 8 15 23 31
FREQUENCY (kHz) FREQUENCY (Hz) FREQUENCY (Hz)
250032 G10 250032 G11 250032 G12
Filtered Output Dynamic Range THD, Harmonics vs Input
vs DF SNR, SINAD vs Input Frequency Frequency
150 105 –90
THD
104 –95 2ND
140 103 –100 3RD
GE (dB)130 dBFS)110012 SNR D (dBFS)––111005
NAMIC RAN120 SINC1 NR, SINAD (19090 SINAD MONICS, TH––112105
DY SINC2 S 98 AR–125
SINC3 H
110 SINC4 97 –130
SSINC 96 –135
FLAT PASSBAND
100 95 –140
4 10 100 1000 16384 0 25 50 75 100 125 150 175 200 0 25 50 75 100 125 150 175 200
DOWNSAMPLING FACTOR FREQUENCY (kHz) FREQUENCY (kHz)
250032 G13 250032 G14 250032 G15
SNR, SINAD vs Input Level, SNR, SINAD vs Reference THD, Harmonics vs Reference
f = 2kHz Voltage, f = 2kHz Voltage, f = 2kHz
IN IN IN
105 105 –115
104
SNR –120
104 SNR 103
S)
NR, SINAD (dBFS)110023 SINAD NR, SINAD (dBFS)11190009012 SINAD MONICS, THD (dBF–––111332505
S S 98 R
A
H
101 97 –140 THD
96 2ND
3RD
100 95 –145
–40 –30 –20 –10 0 2.5 3 3.5 4 4.5 5 2.5 3 3.5 4 4.5 5
INPUT LEVEL (dB) REFERENCE VOLTAGE (V) REFERENCE VOLTAGE (V)
250032 G16 250032 G17 250032 G18
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LTC2500-32
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, V = 2.5V, 0V = 2.5V, V = 2.5V,
A DD DD CM
REF = 5V, f = 1Msps, no latency output, unless otherwise noted.
SMPL
SNR, SINAD vs Temperature, THD, Harmonics vs Temperature,
f = 2kHz f = 100Hz INL vs Temperature
IN IN
106 –110 4
3
105 –115
AD (dBFS)110034 SISNNARD ONICS (dBFS)––112250 3RD THD OR (ppm) 012 MAX INL
N M R
SNR, SI102 THD, HAR–130 2ND INL ER––21 MIN INL
101 –135
–3
100 –140 –4
–40 –15 10 35 60 85 –40 –15 10 35 60 85 –40 –15 10 35 60 85
TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C)
250032 G19 250032 G20 250032 G21
Full-Scale Error vs Temperature Offset Error vs Temperature Supply Current vs Temperature
10 5 10
4 9 IVDD
ULL–SCALE ERROR (ppm) –505 –+FFSS ERO-SCALE ERROR (ppm)––210123 WER SUPPLY CURRENT (mA) 345678
F Z–3 O 2
P IREF IOVDD
–4 1
–10 –5 0
–40 –15 10 35 60 85 –40 –15 10 35 60 85 –40 –15 10 35 60 85
TEMPERATURE (oC) TEMPERATURE (°C) TEMPERATURE (°C)
250032 G22 250032 G23 250032 G24
Reference Current vs Reference
Shutdown Current vs Temperature Voltage CMRR vs Input Frequency
40 1.0 140
VIN+ = VIN– = 4.5VP-P SINE
DOWN CURRENT (µA)2300 NCE CURRENT (mA)000...789 CMRR (dB)111123000
R– RE0.6 100
WE10 EFE
O R
P 0.5 90
0 0.4 80
–40 –15 10 35 60 85 2.5 3 3.5 4 4.5 5 0.01 0.1 1 10 100 500
TEMPERATURE (°C) REFERENCE VOLTAGE (V) FREQUENCY (kHz)
250032 G25 250032 G26 250032 G27
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