Datasheet AK5706 (Asahi Kasei Microdevices)

[AK5706]
AK5706 Low-Power 2-ch ADC with AAA and Audio Buffer 1. General Description
The AK5706 is a high-performance 24-bit stereo ADC (Analog-to-Digital converter) with integrated Acoustic Activity Analyzer (AAA), audio buffer, and support for digital and high-SNR microphones. The AAA listens for audio activity in a very low-power state while the rest of the device remains powered off. Once qualifying audio content is detected, the audio buffer begins recording and the rest of the AK5706 wakes up, in turn waking other devices in the system as needed. Designed for systems that must listen for specific Typ.es of audio activity while consuming very low power, the AK5706 is ideal for products such as speech recognition systems, security cameras, and smart doorbells.
2. Features 1. Acoustic Activity Analyzer (AAA)
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High Accuracy Mode (Idd = 30 µA) / External Trigger Mode (Idd = 11 µA) 2. Audio Buffer: 64 kB for up to 2 sec of recording 3. Audio Capture
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2-Channel Low-Power 24-bit ADC S/N, DR: 105 dB (High Performance Mode) S/N, DR: 103 dB (Low Power Mode)
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Single-ended Inputs or Full-differential Inputs
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MIC Amplifier Gain: +30 dB to 0 dB, 3 dB steps
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4-Channel Digital MIC Interface (64 fs / 32 fs / 48 fs / 24 fs)
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Programmable Phase Adjustment
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Selectable Digital Filter (Low-latency Sharp Roll-off or Voice)
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Microphone Sensitivity Adjustment
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2-output MIC Power Supplies Low-power Mode (Idd = 1 µA): 1.1 V / 1.3 V / 1.8V / Direct Mode Selectable Normal Mode: 2.8 V / 2.5 V / 1.8 V / Direct Mode Selectable 4. External Trigger Input for AAA/ADC Power-up 5. Multi Sync Mode for up to 8-ch recording 6. Digital Audio interface
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Master/Slave Mode
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Sampling Frequency 8 kHz to 192 kHz
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Interface Formats 24 / 16-bit I2S/MSB justified 24 / 16-bit SPI (audio buffer access) 4-ch TDM for Digital Mic 4-ch / 6-ch / 8-ch Sync Transfer for Analog Mic 7. Built-in PLL 8. Crystal Oscillator (12.288 MHz) 9. Control I/F: I2C-bus (400 kHz) / SPI (13 MHz) 10. Operation Temperature Range: Ta =
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40 to 85 °C 11. Power Supply:
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AVDD (ADC, MIC, PLL): 1.7 to 1.9 V or 3.0 to 3.6 V
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TVDD (Host & Audio I/F, LDO): 1.65 to 3.6 V 12. Package: 32-pin CSP (2.668 x 2.695 mm, 0.4mm pitch)
200500012-E-00-PB 2020/05 - 1 - Document Outline 1. General Description 2. Features 3. Table of Contents 4. Block Diagram 5. Pin Configurations and Functions 5.1. Pin Configurations 5.2. Functions 5.3. Handling of Unused Pins 5.4. Pin State in Power-down Mode 6. Absolute Maximum Ratings 7. Recommended Operating Conditions 8. Electrical Characteristics 8.1. Microphone & ADC Analog Characteristics (AVDD = 3.3V: AVDDMD bit = “1”) 8.2. Microphone & ADC Analog Characteristics (AVDD = 1.8V: AVDDMD bit = “0”) 8.3. Acoustic Activity Analyzer Characteristics 8.4. PLL, AOSC Characteristics 8.5. LDO Characteristics 8.6. VCOM Characteristics 8.7. Power Supply Current 8.8. Power Consumption for Each Operation Mode (Typ.) 8.9. Filter Characteristics 8.9.1. Short Delay Sharp Roll-off Filter (ADVF bit = “0”) 8.9.2. Voice Filter (ADVF bit = “1”) 8.10. DC Characteristics 8.11. Switching Characteristics 9. Package 9.1. Outline Dimensions 9.2. Material & Lead finish 9.3. Marking 10. Ordering Guide 11. Revision History IMPORTANT NOTICE