16 Bits Low Power Stereo Audio ADC w/Microphone Bias & Microphone Amplifier datasheet

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PCM1870
SLAS544A–MAY2007–REVISEDSEPTEMBER2007
16-Bit Low-Power Stereo Audio ADC With Microphone Bias and Microphone Amplifier
FEATURES • Package:
1
• AnalogFrontEnd: – 24-QFN(4 mm· 5mm)
– StereoSingleEndInputWith MUX – 24-DSBGA(2.49mm· 3.49 mm)
– Mono DifferentialInput • OperationTemperatureRange:–40(cid:176) Cto85(cid:176) C
– StereoProgrammableGain Amplifier
APPLICATIONS
– MicrophoneBoostAmplifierand Bias
• PortableAudioPlayer, CellularPhone
• AnalogPerformancesDynamicRange:90dB
• VideoCamcorder,MovieDigital Still Camera
• Power-SupplyVoltage
• PMP/DMB,VoiceRecorder
– 1.71Vto3.6Vfor DigitalI/OSection
– 1.71Vto3.6Vfor DigitalCoreSection DESCRIPTION
– 2.4Vto3.6Vfor AnalogSection
The PCM1870 is a low-power stereo ADC designed
• LowPowerDissipation: for portable digital audio applications, with line-input
– 13mWinRecord,1.8/2.4V,48kHz,Stereo amplifier, boost amplifier, microphone bias,
programmable gain control, sound effects, and auto
– 5.3mWin Record,1.8/2.4V, 8kHz,Mono
level control (ALC). It is available in 24-QFN (4-mm ·
– 3.3μWinAllPower Down 5-mm) and 24-DSBGA (2.49-mm · 3.49-mm)
• SamplingFrequency:5kHzto50kHz packages to save footprint. The PCM1870 accepts
• AutoLevelControlfor Recording right-justified, left-justified, I2S, and DSP formats,
providing easy interfacing to audio DSP and encoder
• OperationbySingleClockInputWithoutPLL chips. Sampling rates up to 50 kHz are supported.
• SystemClock:Common AudioClock The user-programmable functions are accessible
(256f /384f ),12/24,13/26,13.5/27,19.2/38.4, througha2-or3-wire serialcontrol port.
S S
19.68/39.36MHz
• 2(I2C)or3(SPI)WireSerialControl
• ProgrammableFunctionbyRegisterControl:
– DigitalSoftMute
– Power Up/DownControlfor Each Module
– 30-dBto–12-dBGainforAnalog Inputs
– 0/12/20-dBBoostforMicrophoneInput
– Parameter Settingsfor ALC
– Three-Band ToneControland3DSound
– High-Pass Filterand Two-StageNotchFilter
• PopNoiseReductionCircuit
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2007,TexasInstrumentsIncorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarilyincludetestingofallparameters.
PCM1870
www.ti.com
SLAS544A–MAY2007–REVISEDSEPTEMBER2007
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore
susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
ABSOLUTE MAXIMUM RATINGS
overoperatingfree-airtemperaturerange(unlessotherwisenoted)(1)
PCM1870 UNIT
V ,V ,V Supplyvoltage –0.3to4 V
DD IO CC
Groundvoltagedifferences:DGND,AGND,PGND ±0.1 V
Inputvoltage –0.3to4 V
Inputcurrent(anypinsexceptsupplies) ±10 mA
Ambienttemperatureunderbias –40to110 (cid:176) C
Storagetemperature –55to150 (cid:176) C
Junctiontemperature 150 (cid:176) C
Leadtemperature(soldering) 260/5 (cid:176) C/s
Packagetemperature(reflow,peak) 260 (cid:176) C
(1) Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratings
only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindictedunderrecommendedoperating
conditionsisnotimpled.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliabiltiy.
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
V Analogsupplyvoltage 2.4 3.3 3.6 V
CC
V ,V Digitalsupplyvoltage 1.71 3.3 3.6 V
DD IO
Digitalinputlogicfamily CMOS
SCKIsystemclock 3.072 18.432 MHz
Digitalinputclockfrequency
LRCKsamplingclock 8 48 kHz
Digitaloutputloadcapacitance 10 pF
T Operatingfree-airtemperature –40 85 (cid:176) C
A
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SLAS544A–MAY2007–REVISEDSEPTEMBER2007
ELECTRICAL CHARACTERISTICS
AllspecificationsatT =25(cid:176) C,V =V =V =V =3.3V,f =48kHz,systemclock=256f ,and16-bitdata,unless
A DD IO CC PA S S
otherwisenoted
PCM1870RHF,PCM1870YZF
PARAMETER TESTCONDITIONS UNIT
MIN TYP MAX
AUDIODATA
DataFormat
Resolution 16 Bits
Audiodatainterfaceformat I2S,left-,right-justified,DSP
Audiodatabitlength 16 Bits
Audiodataformat MSB-first,2s-complement
f Samplingfrequency 5 50 kHz
S
V <2V 27
DD
Systemclock MHz
V >2V 40
DD
DIGITALINPUT/OUTPUT
Logicfamily CMOScompatible
V 0.7V
IH IO
Inputlogiclevel VDC
V 0.3V
IL IO
I V =3.3V 10
IH IN
Inputlogiccurrent μA
I V =0V –10
IL IN
V I =–2mA 0.75V
OH OH IO
Outputlogiclevel VDC
V I =2mA 0.25V
OL OL IO
LINEINPUTTODIGITALOUTPUTTHROUGHADC(AIN1L/R,AIN2L/RANDPGINL/R—ALC=OFF,PG1=PG2=PG3=PG4=0dB
DynamicPerformance
2.828 Vp-p
Full-scaleinputvoltage 0dB
1 Vrms
Dynamicrange EIAJ,A-weighted 90 dB
SNR Signal-to-noiseratio EIAJ,A-weighted 83 90 dB
Channelseparation 87 dB
THD+N Totalharmonicdistortion+noise –1dB 0.009% 0.017%
AnalogInput
Centervoltage 0.5V V
CC
AIN1L,AIN1R,AIN2L,andAIN2R 10 20
Inputimpedance PGINLandPGINR,PG3=PG4=–12dB 70 142 kΩ
PGINLandPGINR,PG3=PG4=30dB 4.7 9.5
ANALOGOUTPUTS(AOLANDAOR)
Centervoltage 0.5V V
CC
Loadresistance 10 kΩ
Loadcapacitance 20 pF
MICROPHONEBIAS—ALC=OFF,PG1=PG2=PG3=PG4=0dB
Biasvoltage 0.75V V
CC
Biassourcecurrent 2 mA
Outputnoise 6.5 μV
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SLAS544A–MAY2007–REVISEDSEPTEMBER2007
ELECTRICAL CHARACTERISTICS (continued)
AllspecificationsatT =25(cid:176) C,V =V =V =V =3.3V,f =48kHz,systemclock=256f ,and16-bitdata,unless
A DD IO CC PA S S
otherwisenoted
PCM1870RHF,PCM1870YZF
PARAMETER TESTCONDITIONS UNIT
MIN TYP MAX
FILTERCHARACTERISTICS
DecimationFilterforADC
Passband 0.408f
S
Stopband 0.591f
S
Pass-bandripple ±0.02 dB
Stop-bandattenuation f<3.268f –60 dB
S
Groupdelay 17/f s
S
High-PassFilterforADC
–3dB 3.74
Frequencyresponse(f =4Hz) –0.5dB 10.66 Hz
c
–0.1dB 24.20
–3dB 118.77
Frequencyresponse(f =120Hz) –0.5dB 321.75 Hz
c
–0.1dB 605.52
–3dB 235.68
Frequencyresponse(f =240Hz) –0.5dB 609.95 Hz
c
–0.1dB 2601.2
POWERSUPPLYANDSUPPLYCURRENT
V V 1.71 3.3 3.6
IO IO
V Voltagerange V 1.71 3.3 3.6 VDC
DD DD
V V 2.4 3.3 3.6
CC CC
BPZinput,allactive,noload 8 12 mA
Supplycurrent
Allinputsareheldstatic. 1 10 μA
BPZinput 26.4 39.6 mW
Powerdissipation
Allinputsareheldstatic. 3.3 33 μW
TEMPERATURECONDITION
Operationtemperature –40 85 (cid:176) C
θ Thermalresistance 35 (cid:176) C/W
JA
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SLAS544A–MAY2007–REVISEDSEPTEMBER2007
PIN ASSIGNMENTS
RHF Package YZF Package
(Top View) (Top View)
AGND VCC MICB AIN1L AIN1R A
AIN1R AIN1L MICB V
COM
24 23 22 21 20
B
V 1 19 PGINL
COM PGINR PGINL V AGND
CC
AIN2R 2 18 AOL
C
AIN2L 3 17 PGINR
AOR AOL AIN2R AIN2L
MODE 4 16 AOR D
MS/ADR 5 15 TEST TEST MODE MS/ADRMD/SDA
MD/SDA 6 14 LRCK E
MC/SCL 7 13 BCK LRCK DGND VIO MC/SCL
8 9 10 11 12 F
BCK SCKI V DOUT
DD
UT VIO VDD ND CKI 1 2 3 4
O G S
D D P0057-01
Table1. TERMINALFUNCTIONS
TERMINAL
NO. I/O DESCRIPTION
NAME
RHF YZF
AGND 24 B4 – Groundforanalog
AIN1L 21 A2 I Analoginput1forL-channel
AIN1R 20 A1 I Analoginput1forR-channel
AIN2L 3 C4 I Analoginput2forL-channel
AIN2R 2 C3 I Analoginput2forR-channel
AOL 18 C2 O MicrophoneamplifieroutputforL-channel
AOR 16 C1 O MicrophoneamplifieroutputforR-channel
BCK 13 F1 I/O Serialbitclock
DGND 11 E2 – Groundfordigital
DOUT 8 F4 O Serialaudiodataoutput
LRCK 14 E1 I/O Left-andright-channelclock
MC/SCL 7 E4 I Modecontrolclockfor3-wire/2-wireinterface
MD/SDA 6 D4 I/O Modecontroldatafor3-wire/2-wireinterface
MICB 22 A3 O Microphonebiassourceoutput
MODE 4 D2 I 2-or3-wireinterfaceselection(LOW:SPI,HIGH:I2C)
MS/ADR 5 D3 I Modecontrolselectfor3-wire/2-wireinterface
PGINL 19 B2 I AnaloginputtogainamplifierforL-channel
PGINR 17 B1 I AnaloginputtogainamplifierforR-channel
SCKI 12 F2 I Systemclock
TEST 15 D1 I TestPin.Shouldbeconnectedtoground.
V 23 B3 – Powersupplyforanalog
CC
V 1 A4 – Commonvoltageforanalog
COM
V 10 F3 – Powersupplyfordigitalcore
DD
V 9 E3 – PowersupplyfordigitalI/O
IO
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FUNCTIONALBLOCKDIAGRAM
MD/SDA MC/SCL MS/ADR MODE AOL PGINL TEST SCKI DOUT BCK LRCK
2 Clock
SerialInterface(SPI/IC) Manager AudioInterface
Mute
PG1 ATR
AIN2L MUX1 3MUX
AIN1L
0/+12/+20 dB
ADL
PG3
DS Digital
D2S
+30 to–12 dB ADC Filter
ADR
PG4
+30 to–12 dB DS Digital
ADC Filter
AIN1R 2 PG2
X 4
U X
M U
AIN2R M
MCB 0/+12/+20 dB ModuleThatCanBePoweredUp/Down
MicBias
MICB
PowerOn PowerUp/Down
CCOOMM Reset Manager
V V
COM COM
AOR PGINR V V DGND V AGND
IO DD CC
B0231-01
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TYPICAL PERFORMANCE CURVES
AllspecificationsatT =25(cid:176) C,V =V =V =V =3.3V,f =8kHzto48kHz,systemclock=256f and16-bitdata,
A DD IO CC PA S S
unlessotherwisenoted.
DECIMATIONFILTER,STOP-BAND DECIMATIONFILTER,PASS-BAND
0 0.2
–20
0.1
–40
B B
d d
– –
e e
d –60 d 0
u u
plit plit
m m
A –80 A
–0.1
–100
–120 –0.2
0 1 2 3 4 0 0.1 0.2 0.3 0.4 0.5
Frequency[´f ] Frequency[´f ]
S S
G001 G002
Figure1. Figure2.
HIGH-PASSFILTERPASS-BANDCHARACTERISTICS HIGH-PASSFILTERPASS-BANDCHARACTERISTICS
(f =4Hzat48kHz) (f =120Hzat48kHz)
C C
5 5
0 0
B B
d –5 d –5
– –
e e
d d
u u
plit plit
m –10 m –10
A A
–15 –15
–20 –20
0 0.0005 0.001 0.0015 0.002 0 0.005 0.01 0.015 0.02
Frequency[´f ] Frequency[´f ]
S S
G003 G012
Figure3. Figure4.
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TYPICAL PERFORMANCE CURVES (continued)
AllspecificationsatT =25(cid:176) C,V =V =V =V =3.3V,f =8kHzto48kHz,systemclock=256f and16-bitdata,
A DD IO CC PA S S
unlessotherwisenoted.
HIGH-PASSFILTERPASS-BANDCHARACTERISTICS
(f =240Hzat48kHz)
C
5
0
B
d –5
–
e
d
u
plit
m –10
A
–15
–20
0 0.01 0.02 0.03 0.04
Frequency[´f ]
S
G004
Figure5.
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TYPICAL PERFORMANCE CURVES (continued)
AllspecificationsatT =25(cid:176) C,V =V =V =V =3.3V,f =44.1kHz,systemclock=256f and16-bitdata,unless
A DD IO CC PA S S
otherwisenoted.
3BANDTONECONTROL(BASS,MID,TREBLE) 3BANDTONECONTROL(BASS)
15 15
10 10
5 5
B B
d d
– –
e e
d 0 d 0
u u
plit plit
m m
A –5 A –5
–10 –10
–15 –15
0.01 0.1 1 10 100 1k 10k 100k 0 200 400 600 800 1k
Frequency–Hz Frequency–Hz
G005 G006
Figure6. Figure7.
3BANDTONECONTROL(MID) 3BANDTONECONTROL(TREBLE)
15 15
10 10
5 5
B B
d d
– –
e e
d 0 d 0
u u
plit plit
m m
A –5 A –5
–10 –10
–15 –15
0 1k 2k 3k 4k 5k 2k 4k 6k 8k 10k 12k 14k
Frequency–Hz Frequency–Hz
G007 G008
Figure8. Figure9.
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TYPICAL PERFORMANCE CURVES (continued)
AllspecificationsatT =25(cid:176) C,V =V =V =V =3.3V,f =48kHz,systemclock=256f and16-bitdata,unless
A DD IO CC PA S S
otherwisenoted.
ADCSNRATHIGHGAIN(PG1/PG2=0dB) ADCSNRATHIGHGAIN(PG1/PG2=20dB)
100 90
85 f =1kHz
IN
90
80
SingleInput
75
85
SingleInput
B B 70
d DifferentialInput d
– 70 – 65
R R
N N
S S 60
60 DifferentialInput
55
50
50
f =1kHz 45
IN
40 40
0 5 10 15 20 25 30 0 5 10 15 20 25 30
PG3/PG4Gain–dB PG3/PG4Gain–dB
G009 G010
Figure10. Figure11.
THD+N/SNRvsPOWERSUPPLY
(ADCTODIGITALOUTPUT)
0.012 92
f =1kHz
IN
0.011 91
THD+N
%0.010 90 B
– d
N –
+ R
D N
TH0.009 89 S
SNR
0.008 88
0.007 87
2 2.5 3 3.5 4
PowerSupply–V
G011
Figure12.
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