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PDF PCM1870 Data sheet ( Hoja de datos )
| Número de pieza | PCM1870 | |
| Descripción | 16-Bit Low-Power Stereo Audio ADC | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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BurrĆBrown Products
from Texas Instruments
PCM1870
SLAS544 – MAY 2007
16-Bit Low-Power Stereo Audio ADC With Microphone Bias and Microphone Amplifier
FEATURES
• Analog Front End:
– Stereo Single End Input With MUX
– Mono Differential Input
– Stereo Programmable Gain Amplifier
– Microphone Boost Amplifier and Bias
• Analog Performances Dynamic Range: 90 dB
• Power-Supply Voltage
– 1.71 V to 3.6 V for Digital I/O Section
– 1.71 V to 3.6 V for Digital Core Section
– 2.4 V to 3.6 V for Analog Section
• Low Power Dissipation:
– 13 mW in Record, 1.8/2.4 V, 48 kHz, Stereo
– 5.3 mW in Record, 1.8/2.4 V, 8 kHz, Mono
– 3.3 µW in All Power Down
• Sampling Frequency: 5 kHz to 50 kHz
• Auto Level Control for Recording
• Operation by Single Clock Input Without PLL
•www.DataSheet4U.com System Clock: Common Audio Clock
(256 fS/384 fS), 12/24, 13/26, 13.5/27, 19.2/38.4,
19.68/39.36 MHz
• 2 (I2C) or 3 (SPI) Wire Serial Control
• Programmable Function by Register Control:
– Digital Soft Mute
– Power Up/Down Control for Each Module
– 30-dB to –12-dB Gain for Analog Inputs
– 0/12/20-dB Boost for Microphone Input
– Parameter Settings for ALC
– Three-Band Tone Control and 3D Sound
– High-Pass Filter and Two-Stage Notch
Filter
• Pop Noise Reduction Circuit
• Package: 24-QFN (4 mm × 5 mm)
• Operation Temperature Range: –40°C to 85°C
APPLICATIONS
• Portable Audio Player, Cellular Phone
• Video Camcorder, Movie Digital Still Camera
• PMP/DMB, Voice Recorder
DESCRIPTION
The PCM1870 is a low-power stereo ADC designed
for portable digital audio applications, with line-input
amplifier, boost amplifier, microphone bias,
programmable gain control, sound effects, and auto
level control (ALC). It is available in a 24-QFN (4-mm
× 5-mm) package to save footprint. The PCM1870
accepts right-justified, left-justified, I2S, and DSP
formats, providing easy interfacing to audio DSP and
encoder chips. Sampling rates up to 50 kHz are
supported. The user-programmable functions are
accessible through a 2- or 3-wire serial control port.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
1 page  
www.ti.com
TERMINAL
NAME
NO.
AGND
24
AIN1L
21
AIN1R
20
AIN2L
3
AIN2R
2
AOL
18
AOR
16
BCK
13
DGND
11
DOUT
8
LRCK
14
MC/SCL
7
MD/SDA
6
MICB
22
MODE
4
MS/ADR
5
PGINL
19
PGINR
17
SCKI
12
TEST
15
VCC
VCOM
VDD
VIO
23
1
10
9
Table 1. TERMINAL FUNCTIONS
I/O DESCRIPTION
– Ground for analog
I Analog input 1 for L-channel
I Analog input 1 for R-channel
I Analog input 2 for L-channel
I Analog input 2 for R-channel
O Microphone amplifier output for L-channel
O Microphone amplifier output for R-channel
I/O Serial bit clock
– Ground for digital
O Serial audio data output
I/O Left- and right-channel clock
I Mode control clock for 3-wire / 2-wire interface
I/O Mode control data for 3-wire / 2-wire interface
O Microphone bias source output
I 2- or 3-wire interface selection (LOW: SPI, HIGH: I2C)
I Mode control select for 3-wire / 2-wire interface
I Analog input to gain amplifier for L-channel
I Analog input to gain amplifier for R-channel
I System clock
I Test Pin. Should be connected to ground.
– Power supply for analog
– Common voltage for analog
– Power supply for digital core
– Power supply for digital I/O
PCM1870
SLAS544 – MAY 2007
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PCM1870
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PCM1870 DESCRIPTION
SLAS544 – MAY 2007
Analog Input
The AIN1L, AIN1R, AIN2L and AIN2R pins can be used as microphone or line inputs with selectable 0- or 20-dB
boost and 1-Vrms input. All analog inputs have high input impedance (20 kΩ), which is not changed by gain
settings. One pair of inputs is selected by register 87 (AIL[1:0], AIR[1:0]). AIN1L and AIN1R can also be used as
a monaural differential input.
Gain Setting for Analog Input
Analog signals can be adjusted from 30 dB to –12 dB in 1-dB steps after the 0-, 12- or 20-dB boost amplifier.
Gain level can be set for each channel by register 79, 80 (ALV[5:0], ARV[5:0]).
A/D Converter
The ADC includes a multilevel delta-sigma modulator, aliasing filter, decimation filter, high-pass filter and notch
filter and can accept 1 Vrms as full-scale input voltage. The decimation filter has a digital soft mute controlled by
register 81 (RMUL, RMUR), and the high-pass and notch filters can be disabled by register 81 (HPF[1:0]) and
registers 96 through 104 if they are not needed to cancel dc offset or avoid wind noise.
Common Voltage
Unbuffered common voltage. The VCOM pin is normally biased to 0.5 VCC, and it provides common voltage to
internal circuitry. Connecting a 4.7-µF capacitor to this pin is recommended to optimize analog performance.
Microphone Bias
The MICB pin is a microphone bias source for an external microphone, which can provide 2 mA (typ) bias
current.
Auto Level Control (ALC) for Recording
The sound when microphone recording should be adjusted to a suitable level without saturation. The digitally
controlled auto level control (ALC) automatically expands small input signals and compresses large input signals
while recording. Expansion level, compression level, attack time, and recovery time can be selected by register
83. See the bit descriptions of register 83 for detailed settings.
3D Sound
A 3D sound effect is provided by mixing L-channel and R-channel data through a band-pass filter with two
control parameters, mixing ratio and band-pass filter characteristic. The control parameters are set in register 95
(3DP[3:0], 3FLO). The 3D sound effect is applied to the ADC digital output.
3-Band Tone Control
Tone control has bass, midrange, and treble controls that can be adjusted from 12 dB to –12 dB in 1-dB steps
by register 92 to 94 (LGA[4:0], MGA[4:0] and HGA[4:0]). Register 92 (LPAE), which attenuates the digital input
signal automatically, can prevent clipping of the output signal at settings higher than 0 dB for bass control. LPAE
is not effective for midrange and treble control.
High-Pass Filter and Notch Filter
The high-pass filter cuts dc offset in the analog section of the ADC and can be set to 4 Hz, 120 Hz, or 240 Hz at
48-kHz sampling by register 81 (HPF[1:0]).
Notch filters remove noise at particular frequencies, CCD noise, motor noise and other mechanical noise in an
application. The PCM1870 has two notch filters, whose center frequency and frequency bandwidth can be
programmed by registers 96 to 104.
Digital Monaural Mixing
The audio data can be mixed to monaural digital data from stereo digital data in the internal audio interface
section by register 96 (MXEN).
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