Features for the PCM1861

High SNR Performance:
110-dB SNR (PCM1861/63/65)
103-dB SNR (PCM1860/62/64)

ADC Sample Rate (fS) = 8 kHz to 192 kHz
Up To Four Independent ADC Channels Available
Single-Ended, 2.1-VRMS Full-Scale (FS) Input
Differential, 4.2-VRMS 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

Description for the PCM1861

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

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

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