مدار مجتمع (آی سی) آی‌سی تعبیه‌شده (پردازنده) پردازندهٔ سیگنال دیجیتال (دی‌اس‌پی)

Product Attributes

Introduction

The AK7738 is a highly integrated DSP featuring a 24-bit stereo ADC with microphone gain amplifier, a 24-bit stereo ADC with input selector, a mono ADC, two 32-bit stereo DACs, four stereo sample rate converters supporting sampling frequencies up to 192kHz, two DSPs, and a sub-DSP for audio/high-frequency processing. Each pair of DSPs and one sub-DSP provides parallel processing capability of 2560 steps/sampling frequency (at 48kHz sampling frequency). Since the two DSPs can operate at different but synchronous sampling frequencies, the AK7738 can simultaneously process audio and voice, such as for hands-free functionality. As a RAM-based DSP, the AK7738 can be freely programmed for user requirements such as acoustic effects and proprietary high-performance hands-free functionality. The AK7738 is available in a 64-pin LQFP package.

Features

• DSP1/DSP2: (Memory area shared between DSP1 and DSP2)
  • Word length: 28-bit (simple floating-point support)
  • Instruction cycle: 8.1ns (2560× fs at fs = 48kHz)
  • Multiplier: 24 × 24 → 48-bit (double-precision support)
  • Divider: 24 / 24 → 24-bit (floating-point normalization)
  • ALU: 52-bit arithmetic (4-bit overflow guard)
  • Program RAM: 8192 words × 36-bit
  • Coefficient RAM: 6144 words × 24-bit
  • Data RAM: 6144 words × 28-bit
  • Delay RAM: 20480 words × 28-bit
  • JX pin (interrupt)
  • Clock mode selector for DSP1 and DSP2
  • Independent power management for DSP1 and DSP2
• Sub-DSP
  • Word length: 28-bit (simple floating-point support)
  • Instruction cycle: 8.1ns (2560× fs at fs = 48kHz)
  • Multiplier: 24 × 24 → 48-bit (double-precision support)
  • Divider: 24 / 24 → 24-bit (floating-point normalization)
  • ALU: 52-bit arithmetic (4-bit overflow guard)
  • Program RAM: 1024 words × 36-bit
  • Coefficient RAM: 2048 words × 24-bit
  • Data RAM: 4096 words × 28-bit
• ADC1: 24-bit stereo ADC with microphone gain amplifier
  • Sampling frequency: fs = 8kHz ~ 192kHz
  • Per-channel independent analog gain amplifier (0 ~ 18dB (2dB step), 18 ~ 36dB (3dB step))
  • Differential or single-ended input
  • ADC SNR: 102dB (fs = 48kHz, differential input, mic gain = 0dB)
  • Per-channel independent digital volume control (+24 ~ -103dB, 0.5dB step, mute)
  • Analog dynamic range control
  • Digital HPF for DC offset cancellation
  • Low-noise microphone power output: 2 channels
  • 4 digital filters for sound character selection
• ADC2: 24-bit stereo ADC with input selector
  • Sampling frequency: fs = 8kHz ~ 192kHz
  • Analog input selector: differential input × 1 or single-ended input × 2, half-differential input × 1
  • ADC SNR: 102dB (fs = 48kHz, differential input)
  • Per-channel independent digital volume (+24 ~ -103dB, 0.5dB step, mute)
  • Digital HPF for DC offset cancellation
  • 4 digital filters for sound character selection
• ADCM: 24-bit mono ADC
  • Sampling frequency: fs = 8kHz ~ 192kHz
  • Differential or single-ended input
  • ADC SNR: 102dB (fs = 48kHz, differential input)
  • Per-channel independent digital volume (+24 ~ -103dB, 0.5dB step, mute)
  • Digital HPF for DC offset cancellation
  • 4 digital filters for sound character selection
• DAC: Advanced 32-bit DAC
  • 2 channels × 2
  • Sampling frequency: fs = 8kHz ~ 192kHz
  • Single-ended output
  • DAC SNR: 108dB (fs = 48kHz)
  • Per-channel independent digital volume control (+12 ~ -115dB, 0.5dB step, mute)
  • 4 digital filters for sound character selection
• SRC:
  • 2 channels × 4
  • Input fs = 8kHz ~ 192kHz, output fs = 8kHz ~ 192kHz (output fs/input fs = 0.167 ~ 6.0)
• Frequency converter: Mono simple SRC
  • 1 channel × 2
  • Input fs = 44.1kHz ~ 48kHz, output fs = 8kHz ~ 16kHz (output fs/input fs = 0.167 ~ 0.363)
• Digital interface transmitter:
  • Compatible with S/PDIF, IEC60958, AES/EBU, EIAJ CP1201
  • 24-bit stereo output
• Digital interface:
  • Digital input port: up to 24 channels in TDM mode
  • Digital output port: up to 28 channels in TDM mode
  • Independent LRCK/BICK input port × 5 lines
  • Data format: MSB 32, 24-bit / LSB 24, 20, 16-bit / I²S
  • PCM short frame/long frame support
  • TDM format support
• Digital mixer circuit
• PLL circuit
• Microprocessor interface: SPI (up to 7MHz), I²C bus (1MHz, Fast Mode Plus)
• Power supply:
  • Analog AVDD: 3.0 ~ 3.6V (typical 3.3V)
  • Digital LVDD: 3.0 ~ 3.6V (typical 3.3V) (integrated 3.3V → 1.2V regulator)
  • Interface VDD33: 3.0 ~ 3.6V (typical 3.3V)
  • TVDD1: 1.7 ~ 3.6V (typical 3.3V)
  • TVDD2: 1.7 ~ 3.6V (typical 3.3V)
• Operating temperature range: -40℃ ~ 85℃
• Package: 64-pin LQFP (10mm × 10mm, 0.5mm pitch)