Automotive 4-ch analog and 4-ch digital audio ADC with integrated mic bias and input diagnostics


Product details


Number of ADC channels 4 Analog inputs 4 Digital audio interface I2S, L, TDM Control interface I2C, SPI Sampling rate (Max) (kHz) 768 ADC SNR (Typ) (dB) 110 Rating Automotive open-in-new Find other Audio ADCs

Package | Pins | Size

WQFN (RTV) 32 25 mm² 5 x 5 open-in-new Find other Audio ADCs


  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C ≤ TA ≤ +125°C
  • Simultaneous conversion of upto 8-channel audio
    • 4-channel analog microphone or line inputs
    • 4-channel digital PDM microphone inputs
  • ADC performance:
    • Line differential input dynamic range: 110 dB
    • Microphone differential input dynamic range: 110 dB
    • THD+N: –95 dB
  • ADC analog input voltage:
    • Differential, 10-VRMS full-scale inputs
    • Single-ended, 5-VRMS full-scale inputs
  • ADC sample rate (fS) = 8 kHz to 768 kHz
  • Programmable channel settings:
    • Analog input channel gain: 0 dB to 42 dB
    • Digital volume control: –100 dB to 27 dB
    • Gain calibration with 0.1-dB resolution
    • Phase calibration with 163-ns resolution
  • Programmable microphone bias (5 V to 9 V)
  • Programmable microphone analog input fault diagnostics:
    • Open inputs or shorted inputs
    • Short to ground, MICBIAS or VBAT
    • Microphone bias over current protection
  • Low-latency signal processing filter selection
  • Programmable HPF and biquad digital filters
  • I2C or SPI controls
  • Audio serial data interface:
    • Format: TDM, I2S, or left-justified (LJ)
    • Word length: 16 bits, 20 bits, 24 bits, or 32 bits
    • Master or slave interface
  • Single-supply, 3.3-V operation
  • I/O supply operation: 3.3 V or 1.8 V
  • Power consumption:
    • < 20 mW/channel at 48-kHz
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The PCM6480-Q1 is a high-performance audio converter that supports simultaneous sampling of up to a 4-channel analog microphone or a line input with up to a 4-channel digital pulse density-modulation (PDM) microphone input. The device integration enables both in-cabin active noise cancellation (ANC) and voice recognition (VR) applications in a very efficient manner by simultaneously using the analog and digital microphone input sampling. The PCM6480-Q1 consists of high-performance, audio analog-to-digital converters (ADCs) that support analog input signals up to 10 VRMS. The device offers an integrated high-voltage, programmable microphone bias, and input diagnostic circuitry that allow direct connection to microphone-based automotive systems with full fault diagnostic capability for DC-coupled inputs. The device integrates an efficient boost converter to generate a high voltage microphone bias using an external, low-voltage, 3.3-V supply, which is a readily available supply in the system. The PCM6480-Q1 integrates the programable channel gain, digital volume control, a low-jitter phase-locked loop (PLL), a programmable high-pass filter (HPF), biquad filters, low-latency filter modes, and allows for sample rates up to 768 kHz. The PCM6480-Q1 supports time-division multiplexing (TDM), I2S, or left-justified (LJ) audio formats, and can be controlled with either the I2C or SPI interface.

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Technical documentation

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Type Title Date
* Data sheet PCM6480-Q1 Automotive, 8-Channel, 768-kHz, Audio ADC With Integrated Microphone Bias and Input Fault Diagnostics datasheet Dec. 16, 2020
Application note Dynamic Performance Testing of Digital Audio D/A Converters Oct. 02, 2000

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