PCM1870A 90dB SNR Low-Power Stereo Audio ADC With Microphone Bias, ALC, Sound Effect, Notch Filter | TI.com

PCM1870A (ACTIVE) 90dB SNR Low-Power Stereo Audio ADC With Microphone Bias, ALC, Sound Effect, Notch Filter


Recommended alternative parts

  • TLV320ADC3001  -  With PLL, higher SNR, and more advanced filtering capabilities
  • TLV320ADC3101  -  With additional inputs, support for digital microphone, PLL, higher SNR and more advanced filtering capabilities


The PCM1870A 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-DSBGA (2.49-mm × 3.49-mm) package to save footprint. The PCM1870A 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.


  • 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
  • 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
    • Hi-Z for LRCK, BCK and DOUT
    • 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-DSBGA (2.49 mm × 3.49 mm)
  • Operation Temperature Range: -40°C to 85°C
    • Portable Audio Player, Cellular Phone
    • Video Camcorder, Movie Digital Still Camera
    • PMP/DMB, Voice Recorder


Compare all products in Audio ADCs Email Download to Excel
Part number Order ADC channels Analog inputs ADC SNR (Typ) (dB) Sampling rate (Max) (kHz) Control interface Digital audio interface Package size: mm2:W x L (PKG) Approx. price (US$) Analog outputs
PCM1870A Order now 2     2     90     50     I2C
See datasheet (DSBGA)     2.09 | 1ku     0    
TLV320ADC3001 Order now 2     3     92     96     I2C     L
See datasheet (DSBGA)     1.45 | 1ku     0    
TLV320ADC3101 Order now 2     6     92     96     I2C     DSP
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     1.35 | 1ku     0