Low Power Stereo Codec with Headphone Amplifier

The low power CS42L51 audio codec delivers excellent audio performance while maximizing battery life and minimizing end-product form factors. The CS42L51 operates from a single, 1.8 V power supply to optimize power consumption, yet deliver 46 mW into stereo 16 ohm headphones for a great listening experience. This 24-bit, 96 kHz stereo codec allows infinite sample rate adjustment between 4 kHz and 100 kHz and generates its own on-chip negative power supply voltage.

Innovation that Rocks® Cirrus RocksTM Cirrus®


Portable Codecs

Application Categories

Speakers, Smart Home


  • Low power audio codec
    • Stereo playback: 12.93 mW @ 1.8 V
    • Stereo record and playback: 20 mW @ 1.8 V
  • Operates from a single 1.8 V or 2.5 V supply
  • Analog inputs
    • 3:1 stereo input selector
    • PGA, +12 dB to -3 dB in 0.5 dB steps
    • +32 dB or +16 dB stereo microphone pre-amp with bias supply
    • Automatic level control with overflow detection
  • Analog outputs
    • Configurable as stereo headphone or line level outputs
    • Ground centered outputs – no DC blocking capacitors required
    • Up to 88 mW into stereo 16 Ω headphones (2.5 V)
    • Up to 46 mW into stereo 16 Ω headphones (1.8 V)
  • Digital signal processing engine
    • Digital bass and treble tone control
    • Programmable peak signal detect and limiter
    • Digital volume control with soft ramp and zero cross
    • On-chip beep generation
  • 98 dB dynamic range
  • -88 dB THD+N (-75 dB with HP load)
  • 24-bit conversion, up to 96 kHz sample rates
  • Flexible power down management – chip/block selectable
  • CS42L51, 32L-QFN, lead-free assembly

Parametric Specifications

DACs 2
ADCs 2
Sample Rate (kHz) 4-96
Analog Power Supply (V) 1.65-2.63
Power Consumption (mW) 7.05-34.3
Package 32 QFN

Technical Documents

CS42L51 Product Datasheet

DS679F2 : 2727 Kb

CS42L51 Product Bulletin

0167-0605-PB-LP : 88 Kb



Comprehensive Solutions