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

The PCM186x family (PCM1860, PCM1861, PCM1862, PCM1863, PCM1864, and PCM1865) of audiofront-end devices take a new approach to audio-function integration to ease compliance withEuropean Ecodesign legislation, while enabling high-performance end products at reduced cost. ThePCM186x support single-supply operation at 3.3 V, and offer an integrated programable gainamplifier (PGA) in a small package; this configuration makes it feasible to implement smaller andsmarter products at a reduced cost.

The PCM186x audio front end supports single-ended input levels from small-mV microphoneinputs to 2.1-V_RMS line inputs, without external resistor dividers. Thefront-end mixer (MIX), multiplexer (MUX), and PGA also support differential (Diff),pseudo-differential, and single-ended (SE) inputs, making these devices an ideal interface forproducts that require interference suppression. The PCM186x integrate many system-level functionsthat assist or replace some DSP functions.

An integrated band-gap voltage reference provides excellent PSRR, so that a dedicatedanalog 3.3-V rail may not be required.

• High SNR Performance:
  • 110-dB SNR (PCM1861/63/65)
  • 103-dB SNR (PCM1860/62/64)
• ADC Sample Rate (f_S) = 8 kHz to 192 kHz
• Up To Four Independent ADC Channels Available
• Single-Ended, 2.1-V_RMS Full-Scale (FS) Input
• Differential, 4.2-V_RMS FS Input
• Hardware (HW) Control: PCM1860/61
• Software (SW) Control (I²C or SPI):
  PCM1862/63/64/65
• Support for Up To Four Digital Microphones
  (SW-Controlled Devices)
• Programmable Gain Amplifier (PGA):
  • Fixed Gain: 0 dB, 12 dB, 32 dB
    (PCM1860/61)
  • SW-Controlled Gain: –12 dB to +32 dB
    (PCM1862/63/64/65)
• Integrated High-Performance Audio PLL
• Single 3.3-V Power-Supply Operation
• Power Dissipation at 3.3 V:
  • < 85 mW (PCM1860/61/62/63)
  • < 145 mW (PCM1864/65)
• Energysense Audio Content Detector for Auto System Wakeup and Sleep
• Master or Slave Audio Interface
• Automatic PGA Clipping Suppression Control
• PCB-Footprint Compatibility Across All Devices

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