Low Power 24-Bit 2ch ADC & 2ch DAC with ALC/Eq and MIC/HP/SPK-Amp
The AK4953A is a low power consumption 24bit stereo CODEC with a microphone, headphone and speaker amplifiers. The input circuits include a microphone amplifier and an ALC (Automatic Level Control) circuit, and the output circuits include a cap-less headphone amplifier and a speaker amplifier. It is suitable for portable application with recording/playback function. The integrated charge pump circuit generates a negative voltage and removes the output AC coupling capacitors. The speaker amplifier has a wide operating voltage range, which is from 0.9V to 5.5V, enabling a direct drive to batteries. The AK4953A is available in a small 36pin QFN (5x5mm 0.4mm pitch), utilizing less board space than competitive offerings.
• Stereo Single-ended input with three Selectors
• MIC Amplifier (+29dB/+26dB/+23dB/+20dB/+16dB/+12dB/0dB)
• Digital ALC (Automatic Level Control)
(Setting Range: +36dB to -54dB, 0.375dB Step)
• ADC Performance: S/(N+D): 82dB, DR, S/N: 88dB (MIC-Amp=+20dB)
S/(N+D): 85dB, DR, S/N: 96dB (MIC-Amp=0dB)
• Wind-noise Reduction Filter
• 5 Band Notch Filter
• Digital MIC Interface
2. Playback Function
• Digital De-emphasis Filter (tc=50/15µs, fs=32kHz, 44.1kHz, 48kHz)
• Digital ALC (Automatic Level Control)
(Setting Range: +36dB to -54dB, 0.375dB Step)
• Digital Volume Control (+12dB to -115dB, 0.5dB Step, Mute)
• Capacitor-less Stereo Headphone Amplifier
- HP-Amp Performance: S/(N+D): 80dB@24mW, S/N: 96dB
- Output Power: 24mW@16Ω
- Pop Noise Free at Power-ON/OFF
• Mono Speaker-Amplifier
- SPK-Amp Performance: S/(N+D): 70dB@250mW, S/N: 95dB
- BTL Output
- Output Power: 400mW@8Ω (SVDD=3.3V)
100mW@8Ω (SVDD=1.5V)
• Beep Generator
3. Power Management
4. Master Clock:
(1) PLL Mode
• Frequencies: 11.2896MHz, 12MHz, 13.5MHz, 24MHz, 27MHz (MCKI pin)
32fs or 64fs (BICK pin)
(2) External Clock Mode
• Frequencies: 256fs, 384fs, 512fs or 1024fs (MCKI pin)
5. Output Master Clock Frequencies: 32fs/64fs/128fs/256fs
• PLL Slave Mode (BICK pin): 7.35kHz to 96kHz
• PLL Slave Mode (MCKI pin): 7.35kHz, 8kHz, 11.025kHz, 12kHz, 14.7kHz, 16kHz, 22.05kHz, 24kHz, 29.4kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz, 96kHz
• PLL Master Mode: 7.35kHz, 8kHz, 11.025kHz, 12kHz, 14.7kHz, 16kHz, 22.05kHz, 24kHz, 29.4kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz, 96kHz
• EXT Master/Slave Mode: 7.35kHz to 96kHz (256fs), 7.35kHz to 48kHz (384fs),
7.35kHz to 48kHz (512fs), 7.35kHz to 12kHz (1024fs)
6. µP I/F: 3-wire Serial, I2C Bus (Ver 1.0, 400kHz Fast-Mode)
7. Master/Slave mode
8. Audio Interface Format: MSB First, 2’s complement
• ADC: 24bit MSB justified, 16/24bit I2S
• DAC: 24bit MSB justified, 16bit LSB justified, 24bit LSB justified, 16/24bit I2S
9. Ta = -30 to 85°C (SPK-Amp = OFF)
Ta = -30 to 70°C (SPK-Amp = ON)
10. Power Supply:
• Analog Power Supply (AVDD): 2.85 to 3.5V
• Digital Power Supply (DVDD): 1.6 to 2.0V
• Digital I/O Power Supply (TVDD): DVDD to 3.5V
• Speaker Power Supply (SVDD): 0.9 to 5.5V
11. Package: 36pin QFN (5 x 5mm, 0.4mm pitch)