AK5704EN

Low-Power 4-ch 32-bit ADC with MIC-Amp

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  • Evaluation Board Manual
  • Data Sheet

Description

The AK5704 is a high performance analog front-end AD converter IC ideal for voice recognition, voice control, and conferencing applications. The device has a built-in 4-ch 32-bit ADC and a low noise microphone amplifier and extracts full performance of a high S/N microphone with low power consumption by achieving dynamic range of 105dB. It is possible to support up to 16-ch microphone array by connecting multiple AK5704’s. In addition, since it incorporates ultra-low power consumption voice activity detection, power consumption during wait time is greatly reduced.

Key Features

1. Recording Function
   • 4-Channel Low Power 32-bit ADC
2-types Digital Filter (Low-latency [5/fs] Sharp Roll-off and Voice)
   • Single-ended Inputs or Full-differential Inputs
   • MIC Amplifier Gain: +30 dB to 0 dB, 3 dB step
   • 2-output MIC Power Supplies: 2.8 V / 2.5 V / 1.8 V / Direct Mode Selectable
   • ADC Characteristics:
   S/N, DR: 105 dB, THD+N: -90 dB, (Gain = 0 dB)
   S/N, DR: 96 dB, THD+N: -86 dB, (Gain = +18 dB)
   • Excellent Power Supply Noise Reduction
   PSRR: 60dB
   Spurious Free Dynamic Range: 100dBc
   • 4-Channel Digital MIC Interface
   • Programmable Phase Adjustment
   • Microphone Sensitivity Adjustment
2. Digital Voice Activity Detector
3. Programmable Digital Filter
   • Mixer
   • 2nd order HPF and LPF
   • Digital ALC (Automatic Level Control): 4-ch Link Mode, 2-ch Mode
4. Digital Audio interface
   • Master/Slave mode
   • Sampling Frequency:
   8 k, 11.025 k, 12 k, 16 k, 22.05 k, 24 k, 32 k, 44.1 k, 48 k, 88.2 k, 96 k, 176.4 k, 192 kHz
   • Interface Format
  - 32/24/16-bit I2S/MSB justified, 16-bit PCM Short/Long Frame
  - 4-ch TDM
  - 8/12/16-ch Cascade TDM
5. Built-in PLL
6. Control I/F: I2C-bus (400kHz)
7. Operation Temperature Range: Ta = -40 to 85°C
8. Power Supply:
   • AVDD (ADC, MIC, PLL): 1.7 to 1.9 V or 3.0V to 3.6V
   • TVDD (Host & Audio I/F, LDO12): 1.65 to 3.6 V
9. Package: 28-pin QFN

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