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PCM1864

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103dB 4-Channel Software-Controlled Audio ADC With Universal Front End

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Data sheet

PCM1864

ACTIVE
Data sheet Order now

Product details

Number of ADC channels 4 Analog inputs 8 Digital audio interface L Control interface I2C Sampling rate (Max) (kHz) 192 ADC SNR (Typ) (dB) 103 Rating Catalog
Number of ADC channels 4 Analog inputs 8 Digital audio interface L Control interface I2C Sampling rate (Max) (kHz) 192 ADC SNR (Typ) (dB) 103 Rating Catalog
TSSOP (DBT) 30 34 mm² 7.8 x 4.4
  • 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
  • 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

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.

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.
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Technical documentation

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Type Title Date
* Data sheet PCM186x 4-Channel or 2-Channel, 192-kHz, Audio ADCs datasheet (Rev. D) PDF | HTML 28 Mar 2018
Analog Design Journal Selecting capacitors to minimize distortion in audio applications 23 Jun 2020
White paper Designing professional audio mixers for every scenario 28 Jun 2018
Application note Sitara Linux ALSA DSP Microphone Array Voice Recognition 30 Jun 2017
Design guide PCM1864 Based Circular Microphone Board Reference Design 10 Apr 2017
EVM User's guide PCM186x EVM User's Guide 31 Mar 2015
Application note Optimizing Signal Chain Noise on PCM186x Devices 05 Feb 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

PCM1864EVM — PCM1864 103dB 4-Ch Software-Controlled Audio ADC With Universal Front End Evaluation Module

The PCM1864 evaluation module (EVM) is an easy-to-use board for full evaluation of the four channel PCM1864 analog-to-digital converter (ADC). The included USB-12X board connects the EVM to the PC and provides 5-V power. The PCM1864EVM is controlled by PurePath™ Console, which allows the (...)

User guide: PDF
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Support software

PCM186x Mixer Coefficient Calculation

SLAC663.ZIP (110 KB)
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Simulation model

PCM186x IBIS Model

SLAM211.ZIP (79 KB) - IBIS Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

TIDA-01454 — PCM1864-Based Circular Microphone Board (CMB) Reference Design

The PCM1864 circular microphone board (CMB) is a low-cost easy-to-use reference design for applications that require clear-spoken audio, such as voice triggering and speech recognition. This TI Design uses a microphone array to capture a voice signal, and converts it to a digital stream (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01470 — PCM1864-Based Linear Microphone Board (LMB) Reference Design

This easy-to-use reference design is for applications that are cost sensitive and require clear-spoken audio, such as voice triggering and speech recognition. This reference design uses a linear-microphone array (up to four) to capture a voice signal and convert it to a digital stream (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDEP-0088 — Audio Pre-Processing System Reference Design for Voice-Based Applications

This reference design uses multiple microphones, a beamforming algorithm, and other processes to extract clear speech and audio amidst noise and other clutter.  The rapid increase in applications that are used in noise-prone environments for voice activated digital assitants creates demand (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDEP-0077 — Audio Preprocessing System Reference Design for Voice-Based Applications

This reference design uses multiple microphones, a beamforming algorithm, and other processes to extract clear speech and audio amidst noise and other clutter.  The rapid increase in applications that are used in noise-prone environments for voice activated digital assistants creates (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDEP-0083 — Voice Triggering and Processing with Cloud Connection to IBM Watson Reference Design

This reference design enables a single platform for demonstrating end-to-end voice capture, recognition and processing functionality.  It further enhances application development time by including pre-integration with the sensory keyword recognition software and the IBM Watson Cloud services. (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDEP-0099 — Audio Preprocessing System Reference Design for Voice-Based Applications

This reference design uses multiple microphones, a beamforming algorithm, and other processes to extract clear speech and audio amidst noise and other clutter.  The rapid increase in applications that are used in noise-prone environments for voice activated digital assistants creates demand (...)
Design guide: PDF
Schematic: PDF
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TSSOP (DBT) 30 View options

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