110dB 2-Channel Hardware-Controlled Audio ADC With Universal Front End - PCM1861


110dB 2-Channel Hardware-Controlled Audio ADC With Universal Front End



The PCM186x family of audio front-end devices takes a new approach to audio-function integration to ease compliance with European Ecodesign legislation while enabling high-performance end products. With no need for a 5-volt supply or an external programmable-gain amplifier, smaller, smarter products are feasible at reduced cost.

The PCM186x’s highly flexible audio front end supports input levels from small-mV microphone inputs to 2.1VRMS line Inputs without external resistor dividers. The PCM186x family integrates many system-level functions that assist or replace some DSP functions.

All these features are available using a single 3.3V power supply. An integrated bandgap voltage reference provides excellent PSRR, so that a dedicated analog 3.3V rail may not be required.


  • Universal Analog Mic Input, 2.1VRMS Full Scale
    • 8 Analog Inputs with MUX and PGA
    • Analog pre-mix function before PGA/MUX
    • Single Ended, Pseudo-Differential or
      Differential Inputs with Mic Bias
    • 4x Digital Microphone Inputs
  • Up to 4 Mono ADC channels (PCM1865)
  • Hardware Control (PCM1861)
  • I2C or SPI Control (PCM1863/5)
  • H/W Programmable Gain Amplifier
    • Fixed Mic Pregain select : 20, 32dB (Analog)
  • S/W Programmable Gain Amplifier
  • Integrated High Performance Audio PLL
  • Single 3.3V Supply for Analog and Digital
    • Additional 1.8V Core and Interface for lower
      power consumption
  • Power Dissipation at 3.3V: <85mW (PCM1861/3),
    <145mW (PCM1865)
  • ‘Energysense’ Audio Content Detector - for auto
    system wakeup and sleep
  • Master or Slave Audio Interface:
  • Mixer functionality:
    • Digital Mixer to mix ADC outputs and I2S
      synchronous inputs
    • Zero Crossing PGA Gain changes
  • Automatic PGA Clipping Suppression control
  • PCB-footprint compatibility across all 3 devices

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Parametrics Compare all products in Audio ADC

ADC Channels
Analog Inputs
ADC SNR (Typ) (dB)
Sampling Rate (Max) (kHz)
Control Interface
Digital Audio Interface
Additional Features
Package Size: mm2:W x L (PKG)
Approx. Price (US$)
Analog Outputs
Energysense Signal Detection
Analog Mic support   
30TSSOP: 50 mm2: 6.4 x 7.8(TSSOP)   
1.75 | 1ku   

Other qualified versions of PCM1861

Version Part Number Definition
Automotive PCM1861-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects