LTC2208 - 16-Bit, 130Msps ADC

32 Pages·2009·0.94 MB·English

by  Linear Technology Corporation

LTC2208
16-Bit, 130Msps ADC
FEATURES D ESCRIPTION
n Sample Rate: 130Msps The LTC®2208 is a 130Msps, sampling 16-bit A/D converter
n 78dBFS Noise Floor designed for digitizing high frequency, wide dynamic
n 100dB SFDR range signals with input frequencies up to 700MHz. The
n SFDR >83dB at 250MHz (1.5V Input Range) input range of the ADC can be optimized with the PGA
P-P
n PGA Front End (2.25V or 1.5V Input Range) front end.
P-P P-P
n 700MHz Full Power Bandwidth S/H
The LTC2208 is perfect for demanding communications
n Optional Internal Dither
applications, with AC performance that includes 78dBFS
n Optional Data Output Randomizer
Noise Floor and 100dB spurious free dynamic range
n LVDS or CMOS Outputs
(SFDR). Ultra low jitter of 70fs allows undersampling
RMS
n Single 3.3V Supply
of high input frequencies with excellent noise performance.
n Power Dissipation: 1.25W
Maximum DC specs include ±4LSB INL, ±1LSB DNL (no
n Clock Duty Cycle Stabilizer
missing codes).
n Pin Compatible 14-Bit Version
130Msps: LTC2208 (16-Bit), LTC2208-14 (14-Bit) The digital output can be either differential LVDS or
n 64-Pin (9mm × 9mm) QFN Package single-ended CMOS. There are two format options for the
CMOS outputs: a single bus running at the full data rate or
APPLICATIONS demultiplexed buses running at half data rate. A separate
output power supply allows the CMOS output swing to
n Telecommunications range from 0.5V to 3.6V.
n Receivers
The ENC+ and ENC– inputs may be driven differentially
n Cellular Base Stations
or single-ended with a sine wave, PECL, LVDS, TTL or
n Spectrum Analysis
CMOS inputs. An optional clock duty cycle stabilizer al-
n Imaging Systems
lows high performance at full speed with a wide range of
n ATE
clock duty cycles.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V
SENSE 64k Point FFT, F = 15.1MHz,
IN
–1dB, PGA = 0
VCM COMM1.O2N5V MODE INRTEEFRENRAELN ACDEC OVDD 0.5V TO 3.6V 0
2.2μF BIAS VOLTAGE GENERATOR 1μF –10
–20
OF –30
ANINALPOUGTAAIINN+– –+ASM/HP PAIDP1C6E -LCBIONITREDE SHCLIOFOTRG RRIECEC GATINSIODTNER DORUITVPEURTS DCL1•••K5OUT COLVMRDOSS TUDE (dBFS) ––––45670000
D0 PLI –80
M
A –90
OGND
–100
CLOCK/DUTY –110
CYCLE VDD 3.3V
–120
CONTROL 1μF 1μF 1μF
GND –130
2208TA01 0 10 20 30 40 50 60
FREQUENCY (MHz)
ENC+ ENC– PGA SHDN DITH MODE LVDS RAND 2208 TA01b
ADC CONTROL INPUTS
2208fc
1
LTC2208
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
OV = V (Notes 1 and 2)
DD DD
TOP VIEW
Supply Voltage (V ) ...................................–0.3V to 4V
DAnigailtoagl OInuptpuut tV GorltoaDugDned ( NVoolttea g3)e . .(.O..G.–N0D.3) V... .t.o.. .(–VD0D.3 +V 0to.3 1VV) 64 PGA63 RAND62 MODE61 LVDS+60 OF/OFA–59 OF/DA15+58 D15/DA14–57 D15/DA13+56 D14/DA12–55 D14/DA11+54 D13/DA10–53 D13/DA9+52 D12/DA8–51 D12/DA750 OGND49 OVDD
Digital Input Voltage.....................–0.3V to (V + 0.3V)
DD SENSE1 48 D11+/DA6
Digital Output Voltage ................–0.3V to (OV + 0.3V) GND 2 47 D11–/DA5
DD VCM 3 46 D10+/DA4
Power Dissipation ............................................2000mW GND 4 45 D10–/DA3
VDD 5 44 D9+/DA2
Operating Temperature Range VDD 6 43 D9–/DA1
GND 7 42 D8+/DA0
LLTTCC22220088IC . .........................................................................................–..4.00°°CC ttoo 8705°°CC GAANIIDNN +–1 890 65 344910 CDCLL8KK–/OOCUULTTK+O–//CUOLTFKABOUTB
GND 11 38 D7+/DB15
Storage Temperature Range ..................–65°C to 150°C ENC+ 12 37 D7–/DB14
Digital Output Supply Voltage (OV ) ..........–0.3V to 4V ENC– 13 36 D6+/DB13
DD GND 14 35 D6–/DB12
VDD 15 34 D5+/DB11
VDD 16 33 D5–/DB10
V 17DDGND 18SHDN19DITH20–D0/DB0 21+DO/DB1 22–D1/DB2 23+D1/DB3 24–D2/DB4 25+D2/DB5 26–D3/DB6 27+D3/DB7 28–D4/DB8 29+ D4/DB9 30 OGND 31 OV 32DD
UP PACKAGE
64-LEAD (9mm (cid:115) 9mm) PLASTIC QFN
TJMAX = 150°C, θJA = 20°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2208CUP#PBF LTC2208CUP#TRPBF LTC2208UP 64-Lead (9mm × 9mm) Plastic QFN 0°C to 70°C
LTC2208IUP#PBF LTC2208IUP#TRPBF LTC2208UP 64-Lead (9mm × 9mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
CONVERTER CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T = 25°C. (Note 4)
A
PARAMETER CONDITIONS MIN TYP MAX UNITS
Integral Linearity Error Differential Analog Input (Note 5) T = 25°C ±1.2 ±4.0 LSB
A
Integral Linearity Error Differential Analog Input (Note 5) l ±1.5 ±4.5 LSB
Differential Linearity Error Differential Analog Input l ±0.3 ±1 LSB
Offset Error (Note 6) l ±2 ±8.5 mV
Offset Drift ±10 μV/°C
Gain Error External Reference l ±0.2 ±1.5 %FS
Full-Scale Drift Internal Reference ±30 ppm/°C
External Reference ±15 ppm/°C
Transition Noise External Reference 2.9 LSB
RMS
2208fc
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LTC2208
ANALOG INPUT
The l denotes the specifi cations which apply over the full operating temperature range, otherwise
specifi cations are at T = 25°C. (Note 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Analog Input Range (AIN+ – AIN–) 3.135V ≤ VDD ≤ 3.465V 1.5 or 2.25 VP-P
V Analog Input Common Mode Differential Input (Note 7) l 1 1.25 1.5 V
IN, CM
IIN Analog Input Leakage Current 0V ≤ AIN+, AIN– ≤ VDD l –1 1 μA
I SENSE Input Leakage Current 0V ≤ SENSE ≤ V l –3 3 μA
SENSE DD
I MODE Pin Pull-Down Current to GND 10 μA
MODE
I LVDS Pin Pull-Down Current to GND 10 μA
LVDS
C Analog Input Capacitance Sample Mode ENC+ < ENC– 6.5 pF
IN
Hold Mode ENC+ > ENC– 1.8 pF
t Sample-and-Hold 1 ns
AP
Acquisition Delay Time
t Sample-and-Hold 70 fs RMS
JITTER
Acquisition Delay Time Jitter
CMRR Analog Input 1V < (A + = A –) <1.5V 80 dB
IN IN
Common Mode Rejection Ratio
BW-3dB Full Power Bandwidth R < 25Ω 700 MHz
S
DYNAMIC ACCURACY
The l denotes the specifi cations which apply over the full operating temperature range,
otherwise specifi cations are at T = 25°C. A = –1dBFS. (Note 4)
A IN
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SNR Signal-to-Noise Ratio 5MHz Input (2.25V Range, PGA = 0) 77.7 dBFS
5MHz Input (1.5V Range, PGA = 1) 75.3 dBFS
30MHz Input (2.25V Range, PGA = 0) T = 25°C 76.5 77.6 dBFS
A
30MHz Input (2.25V Range, PGA = 0) l 76.1 77.3 dBFS
30MHz Input (1.5V Range, PGA = 1) 75.2 dBFS
70MHz Input (2.25V Range, PGA = 0) 77.5 dBFS
70MHz Input (1.5V Range, PGA = 1) 75.1 dBFS
140MHz Input (2.25V Range, PGA = 0) 76.9 dBFS
140MHz Input (1.5V Range, PGA = 1) T = 25°C 73.8 74.8 dBFS
A
140MHz Input (1.5V Range, PGA = 1) l 73.4 74.5 dBFS
250MHz Input (2.25V Range, PGA = 0) 75.4 dBFS
250MHz Input (1.5V Range, PGA =1) 73.8 dBFS
SFDR Spurious Free 5MHz Input (2.25V Range, PGA = 0) 100 dBc
Dynamic Range 5MHz Input (1.5V Range, PGA = 1) 100 dBc
2nd or 3rd Harmonic
30MHz Input (2.25V Range, PGA = 0) T = 25°C 88 95 dBc
A
30MHz Input (2.25V Range, PGA = 0) l 87 94 dBc
30MHz Input (1.5V Range, PGA = 1) 100 dBc
70MHz Input (2.25V Range, PGA = 0) 90 dBc
70MHz Input (1.5V Range, PGA = 1) 95 dBc
140MHz Input (2.25V Range, PGA = 0) 85 dBc
140MHz Input (1.5V Range, PGA = 1) T = 25°C 86 90 dBc
A
140MHz Input (1.5V Range, PGA = 1) l 84 89 dBc
250MHz Input (2.25V Range, PGA = 0) 78 dBc
250MHz Input (1.5V Range, PGA = 1) 83 dBc
2208fc
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LTC2208
DYNAMIC ACCURACY
The l denotes the specifi cations which apply over the full operating temperature range,
otherwise specifi cations are at T = 25°C. A = –1dBFS unless otherwise noted. (Note 4)
A IN
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SFDR Spurious Free 5MHz Input (2.25V Range, PGA = 0) 100 dBc
Dynamic Range 5MHz Input (1.5V Range, PGA = 1) 100 dBc
4th Harmonic 30MHz Input (2.25V Range, PGA = 0) l 90 100 dBc
or Higher
30MHz Input (1.5V Range, PGA = 1) 100 dBc
70MHz Input (2.25V Range, PGA = 0) 100 dBc
70MHz Input (1.5V Range, PGA = 1) 100 dBc
140MHz Input (2.25V Range, PGA = 0) 95 dBc
140MHz Input (1.5V Range, PGA = 1) l 88 95 dBc
250MHz Input (2.25V Range, PGA = 0) 90 dBc
250MHz Input (1.5V Range, PGA = 1) 90 dBc
S/(N+D) Signal-to-Noise 5MHz Input (2.25V Range, PGA = 0) 77.7 dBFS
Plus Distortion Ratio 5MHz Input (1.5V Range, PGA = 1) 75.3 dBFS
30MHz Input (2.25V Range, PGA = 0) T = 25°C 76.3 77.5 dBFS
A
30MHz Input (2.25V Range, PGA = 0) l 75.9 77.5 dBFS
30MHz Input (1.5V Range, PGA = 1) 75.2 dBFS
70MHz Input (2.25V Range, PGA = 0) 77.4 dBFS
70MHz Input (1.5V Range, PGA = 1) 75 dBFS
140MHz Input (2.25V Range, PGA = 0) 76.4 dBFS
140MHz Input (1.5V Range, PGA = 1) T = 25°C 73.6 74.5 dBFS
A
140MHz Input (1.5V Range, PGA = 1) l 73.2 74.5 dBFS
250MHz Input (2.25V Range, PGA = 0) 73.6 dBFS
250MHz Input (1.5V Range, PGA = 1) 72.9 dBFS
SFDR Spurious Free Dynamic Range 5MHz Input (2.25V Range, PGA = 0) 105 dBFS
at –25dBFS 5MHz Input (1.5V Range, PGA = 1) 105 dBFS
Dither “OFF”
30MHz Input (2.25V Range, PGA = 0) 105 dBFS
30MHz Input (1.5V Range, PGA = 1) 105 dBFS
70MHz Input (2.25V Range, PGA = 0) 105 dBFS
70MHz Input (1.5V Range, PGA = 1) 105 dBFS
14 0MHz Input (2.25V Range, PGA = 0) 100 dBFS
140MHz Input (1.5V Range, PGA = 1) 100 dBFS
250MHz Input (2.25V Range, PGA = 0) 100 dBFS
250MHz Input (1.5V Range, PGA = 1) 100 dBFS
SFDR Spurious Free Dynamic Range 5MHz Input (2.25V Range, PGA = 0) 115 dBFS
at –25dBFS 5MHz Input (1.5V Range, PGA = 1) 115 dBFS
Dither “ON” 30MHz Input (2.25V Range, PGA = 0) l 100 115 dBFS
30MHz Input (1.5V Range, PGA = 1) 115 dBFS
70MHz Input (2.25V Range, PGA = 0) 115 dBFS
70MHz Input (1.5V Range, PGA = 1) 115 dBFS
140MHz Input (2.25V Range, PGA = 0) 110 dBFS
140MHz Input (1.5V Range, PGA = 1) 110 dBFS
250MHz Input (2.25V Range, PGA = 0) 105 dBFS
250MHz Input (1.5V Range, PGA = 1) 105 dBFS
2208fc
4
LTC2208
COMMON MODE BIAS CHARACTERISTICS
The l denotes the specifi cations which apply over
the full operating temperature range, otherwise specifi cations are at T = 25°C. (Note 4)
A
PARAMETER CONDITIONS MIN TYP MAX UNITS
V Output Voltage I = 0 1.15 1.25 1.35 V
CM OUT
V Output Tempco I = 0 +40 ppm/°C
CM OUT
V Line Regulation 3.135V ≤ V ≤ 3.465V 1 mV/ V
CM DD
V Output Resistance 1mA ≤ | I | ≤ 1mA 2 Ω
CM OUT
DIGITAL INPUTS AND DIGITAL OUTPUTS
The l denotes the specifi cations which apply over the
full operating temperature range, otherwise specifi cations are at T = 25°C. (Note 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ENCODE INPUTS (ENC+, ENC–)
V Differential Input Voltage (Note 7) l 0.2 V
ID
V Common Mode Input Voltage Internally Set 1.6 V
ICM
Externally Set (Note 7) 1.2 3.0 V
RIN Input Resistance (See Figure 2) 6 kΩ
C Input Capacitance (Note 7) 3 pF
IN
LOGIC INPUTS (DITH, PGA, SHDN, RAND)
V High Level Input Voltage V = 3.3V l 2 V
IH DD
V Low Level Input Voltage V = 3.3V l 0.8 V
IL DD
I Digital Input Current V = 0V to V l ±10 μA
IN IN DD
C Digital Input Capacitance (Note 7) 1.5 pF
IN
LOGIC OUTPUTS (CMOS MODE)
OV = 3.3V
DD
V High Level Output Voltage V = 3.3V I = –10μA 3.299 V
OH DD O
I = –200μA l 3.1 3.29 V
O
V Low Level Output Voltage V = 3.3V I = 160μA 0.01 V
OL DD O
I = 1.6mA l 0.10 0.4 V
O
I Output Source Current V = 0V –50 mA
SOURCE OUT
I Output Sink Current V = 3.3V 50 mA
SINK OUT
OV = 2.5V
DD
V High Level Output Voltage V = 3.3V I = –200μA 2.49 V
OH DD O
V Low Level Output Voltage V = 3.3V I = 1.60mA 0.1 V
OL DD O
OV = 1.8V
DD
V High Level Output Voltage V = 3.3V I = –200μA 1.79 V
OH DD O
V Low Level Output Voltage V = 3.3V I = 1.60mA 0.1 V
OL DD O
LOGIC OUTPUTS (LVDS MODE)
STANDARD LVDS
VOD Differential Output Voltage 100Ω Differential Load l 247 350 454 mV
VOS Output Common Mode Voltage 100Ω Differential Load l 1.125 1.2 1.375 V
LOW POWER LVDS
VOD Differential Ouptut Voltage 100Ω Differential Load l 125 175 250 mV
VOS Output Common Mode Voltage 100Ω Differential Load l 1.125 1.2 1.375 V
2208fc
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LTC2208
POWER REQUIREMENTS
The l denotes the specifi cations which apply over the full operating temperature
range, otherwise specifi cations are at T = 25°C. A = –1dBFS. (Note 4)
A IN
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V Analog Supply Voltage (Note 8) l 3.135 3.3 3.465 V
DD
P Shutdown Power SHDN = V 0.2 mW
SHDN DD
STANDARD LVDS OUTPUT MODE
OV Output Supply Voltage (Note 8) l 3 3.3 3.6 V
DD
I Analog Supply Current l 380 450 mA
VDD
I Output Supply Current l 74 90 mA
OVDD
P Power Dissipation l 1498 1782 mW
DIS
LOW POWER LVDS OUTPUT MODE
OV Output Supply Voltage (Note 8) l 3 3.3 3.6 V
DD
I Analog Supply Current l 380 450 mA
VDD
I Output Supply Current l 31 50 mA
OVDD
P Power Dissipation l 1356 1650 mW
DIS
CMOS OUTPUT MODE
OV Output Supply Voltage (Note 8) l 0.5 3.6 V
DD
I Analog Supply Current l 380 450 mA
VDD
P Power Dissipation l 1250 1485 mW
DIS
TIMING CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating temperature
range, otherwise specifi cations are at T = 25°C. (Note 4)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f Sampling Frequency (Note 8) l 1 130 MHz
S
t ENC Low Time Duty Cycle Stabilizer Off (Note 7) l 3.65 3.846 1000 ns
L
Duty Cycle Stabilizer On (Note 7) l 2.6 3.846 1000 ns
t ENC High Time Duty Cycle Stabilizer Off (Note 7) l 3.65 3.846 1000 ns
H
Duty Cycle Stabilizer On (Note 7) l 2.6 3.846 1000 ns
t Sample-and-Hold Aperture Delay –1 ns
AP
LVDS OUTPUT MODE (STANDARD and LOW POWER)
t ENC to DATA Delay (Note 7) l 1.3 2.5 3.8 ns
D
t ENC to CLKOUT Delay (Note 7) l 1.3 2.5 3.8 ns
C
t DATA to CLKOUT Skew (t -t ) (Note 7) l –0.6 0 0.6 ns
SKEW C D
t Output Rise Time 0.5 ns
RISE
t Output Fall Time 0.5 ns
FALL
Data Latency Data Latency 7 Cycles
CMOS OUTPUT MODE
t ENC to DATA Delay (Note 7) l 1.3 2.7 4.0 ns
D
t ENC to CLKOUT Delay (Note 7) l 1.3 2.7 4.0 ns
C
t DATA to CLKOUT Skew (t -t ) (Note 7) l –0.6 0 0.6 ns
SKEW C D
Data Latency Data Latency Full Rate CMOS 7 Cycles
Demuxed 7 Cycles
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LTC2208
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 5: Integral nonlinearity is defi ned as the deviation of a code from a “best
may cause permanent damage to the device. Exposure to any Absolute fi t straight line” to the transfer curve. The deviation is measured from the
Maximum Rating condition for extended periods may affect device center of the quantization band.
reliability and lifetime. Note 6: Offset error is the offset voltage measured from –1/2LSB when the
Note 2: All voltage values are with respect to GND, with GND and OGND output code fl ickers between 0000 0000 0000 0000 and 1111 1111 1111
shorted (unless otherwise noted). 1111 in 2’s complement output mode.
Note 3: When these pin voltages are taken below GND or above VDD, they Note 7: Guaranteed by design, not subject to test.
will be clamped by internal diodes. This product can handle input currents Note 8: Recommended operating conditions.
of greater than 100mA below GND or above V without latchup.
DD
Note 4: V = 3.3V, f = 130MHz, LVDS outputs, differential ENC+/
DD SAMPLE
ENC– = 2V sine wave with 1.6V common mode, input range = 2.25V
P-P P-P
with differential drive (PGA = 0), unless otherwise specifi ed.
TIMING DIAGRAMS
LVDS Output Mode Timing
All Outputs are Differential and Have LVDS Levels
tAP
N + 1 N + 4
ANALOG
INPUT N N + 3
N + 2
tH
tL
ENC–
ENC+
tD
D0-D15, OF N – 7 N – 6 N – 5 N – 4 N – 3
tC
CLKOUT+
CLKOUT– 2208 TD01
2208fc
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LTC2208
TIMING DIAGRAMS
Full-Rate CMOS Output Mode Timing
All Outputs are Single-Ended and Have CMOS Levels
tAP
N + 1 N + 4
ANALOG
INPUT N N + 3
N + 2
tH
tL
ENC–
ENC+
tD
DA0-DA15, OFA N – 7 N – 6 N – 5 N – 4 N – 3
tC
CLKOUTA
CLKOUTB
DB0-DB15, OFB HIGH IMPEDANCE
2208 TD02
Demultiplexed CMOS Output Mode Timing
All Outputs are Single-Ended and Have CMOS Levels
tAP
N + 1 N + 4
ANALOG
INPUT N N + 3
N + 2
tH
tL
ENC–
ENC+
tD
DA0-DA15, OFA N – 8 N – 6 N – 4
tD
DB0-DB15, OFB N – 7 N – 5 N – 3
tC
CLKOUTA
CLKOUTB 2208 TD03
2208fc
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LTC2208
TYPICAL PERFORMANCE CHARACTERISTICS
Integral Nonlinearity (INL) vs Differential Nonlinearity (DNL) vs
Output Code Output Code AC Grounded Input Histogram
2 1 10000
0.8 9000
1.5
0.6 8000
1
B) B) 0.4 7000
NL ERROR (LS–00..055 NL ERROR (LS 00..220 COUNT465000000000
I D 0.4 3000
–1
0.6 2000
–1.5 0.8 1000
–2 1 0
0 16384 32768 49152 65536 0 16384 32768 49152 65536 32736 32740 32744 32748 32752 32756
OUTPUT CODE OUTPUT CODE OUTPUT CODE
2208 G01 2208 G02 2208 G14
128k Point FFT, f = 4.93MHz, 64k Point FFT, f = 15.1MHz, 64k Point FFT, 15.1MHz, –20dBFS,
IN IN
–1dBFS, PGA = 0 –1dBFS, PGA = 0 PGA = 0, Internal Dither “Off”
0 0 0
–10 –10 –10
–20 –20 –20
–30 –30 –30
S) –40 S) –40 S) –40
BF –50 BF –50 BF –50
DE (d –60 DE (d –60 DE (d –60
PLITU ––8700 PLITU ––7800 PLITU ––7800
M M M
A –90 A –90 A –90
–100 –100 –100
–110 –110 –110
–120 –120 –120
–130 –130 –130
0 10 20 30 40 50 60 0 10 20 30 40 50 60 0 10 20 30 40 50 60
FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz)
2208 G15 2208 G03 2208 G04
32k Point 2-Tone FFT, 32k Point 2-Tone FFT,
64k Point FFT, 15.1MHz, –20dBFS, f = 21.14MHz and 14.25MHz, f = 20.14MHz and 14.25MHz,
IN IN
PGA = 0, Internal Dither “On” –7dBFS, PGA = 0 –25dBFS, PGA = 0
0 0 0
–10 –10 –10
–20 –20 –20
–30 –30 –30
S) –40 S) –40 S) –40
F F F
B –50 B B
d d –50 d –50
E ( –60 E ( E (
D D –60 D –60
U –70 U U
PLIT –80 PLIT –70 PLIT –70
M M –80 M –80
A –90 A A
–100 –90 –90
–110 –100 –100
–120 –110 –110
–130 –120 –120
0 10 20 30 40 50 60 0 10 20 30 40 50 60 0 10 20 30 40 50 60
FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz)
2208 G05 2208 G06 2208 G07
2208fc
9
LTC2208
TYPICAL PERFORMANCE CHARACTERISTICS
SFDR vs Input Level, fIN = 15MHz, SFDR vs Input Level, fIN = 15MHz, 64k Point FFT, fIN = 30.1MHz,
PGA = 0, Dither “Off” PGA = 0, Dither “On” –1dBFS, PGA = 0
140 140 0
130 130 –10
120 120 –20
110 110 –30
SFDR (dBc AND dBFS)186497500000000 SFDR (dBc AND dBFS)186497500000000 AMPLITUDE (dBFS) ––––––896457000000
30 30 –100
20 20 –110
10 10 –120
0 0 –130
–80 –70 –60 –50 –40 –30 –20 –10 0 –80 –70 –60 –50 –40 –30 –20 –10 0 0 10 20 30 40 50 60
INPUT LEVEL (dBFS) INPUT LEVEL (dBFS) FREQUENCY (MHz)
2208 G08 2208 G09 2208 G16
128k Point FFT, fIN = 30.1MHz, 64k Point FFT, fIN = 70.1MHz, 64k Point FFT, fIN = 70.1MHz,
–25dBFS, PGA = 0, Dither “On” –1dBFS, PGA = 0 –10dBFS, PGA = 0
0 0 0
–10 –10 –10
–20 –20 –20
–30 –30 –30
S) –40 S) –40 S) –40
F F F
B –50 B –50 B –50
d d d
E ( –60 E ( –60 E ( –60
D D D
TU –70 TU –70 TU –70
PLI –80 PLI –80 PLI –80
M M M
A –90 A –90 A –90
–100 –100 –100
–110 –110 –110
–120 –120 –120
–130 –130 –130
0 10 20 30 40 50 60 0 10 20 30 40 50 60 0 10 20 30 40 50 60
FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz)
2208 G17 2208 G18 2208 G19
64k Point FFT, fIN = 70.1MHz, 128k Point FFT, fIN = 70.1MHz, 64k Point FFT, fIN = 70.1MHz,
–20dBFS, PGA = 0 –25dBFS, PGA = 0, Dither “On” –1dBFS, PGA = 1
0 0 0
–10 –10 –10
–20 –20 –20
–30 –30 –30
S) –40 S) –40 S) –40
BF –50 BF –50 BF –50
DE (d –60 DE (d –60 DE (d –60
PLITU ––8700 PLITU ––8700 PLITU ––8700
M M M
A –90 A –90 A –90
–100 –100 –100
–110 –110 –110
–120 –120 –120
–130 –130 –130
0 10 20 30 40 50 60 0 10 20 30 40 50 60 0 10 20 30 40 50 60
FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz)
2208 G20 2208 G21 2208 G22
2208fc
10