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Stereo CODEC. AK4955 Datasheet |
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[AK4955]
AK4955
24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP
GENERAL DESCRIPTION
The AK4955 is a 24bit stereo CODEC with a microphone amplifier, speaker amplifier, video amplifier,
LDO, and DSP. The input circuits include a microphone amplifier and the output circuits include a speaker
amplifier. It is suitable for portable application with recording/playback function. A one channel composite
In/Out video amplifier is also integrated. The internal charge pump generates a negative power
eliminating the need for AC-coupling capacitors. The AK4955 is available in a small 36pin CSP (3.0mm x
3.1mm, 0.5mm pitch), saving mounting area on the board.
FEATURES
1. Recording Functions
• Stereo Single-ended input with two Selectors
• MIC Amplifier (+24dB/+21dB/+18dB/+16dB/+14dB/+11dB/+8dB/+5dB/0dB)
• Digital ALC (Automatic Level Control)
(Setting Range: +36dB ∼ −54dB, 0.375dB Step)
• ADC Performance: S/(N+D): 81dB, DR, S/N: 88dB (MIC-Amp=+18dB)
S/(N+D): 82dB, DR, S/N: 96dB (MIC-Amp=0dB)
• Microphone Sensitivity Compensation
• 5 Band Notch Filter
• Stereo Separation Emphasis Circuit
• Digital MIC Interface
2. Playback Functions
• Digital De-emphasis Filter (tc=50/15µs, fs=32kHz, 44.1kHz, 48kHz)
• Soft Mute
• Digital ALC (Automatic Level Control)
- Setting Range: +36dB ~ −54dB, 0.375dB Step
• Digital Volume Control (+12dB ~ −115dB, 0.5dB Step & Mute)
• Stereo Separation Emphasis Circuit
• Stereo Line Output
- Output Voltage: +2dBV(1.26Vrms) (LVDD= 4.8V)
2.52Vpp (LVDD=3.3V)
- S/(N+D): 85dB, S/N: 92dB
• Mono Mixing Output
• Mono Speaker-Amplifier
- S/(N+D): 70dB@150mW, 60dB@250mW,
- S/N: 95dB
- BTL Output
- Output Power: 600mW@8Ω (SVDD=4.8V)
400mW@8Ω (SVDD=3.3V)
• Analog Mixing: Mono Input
• Beep Generator
MS1343-E-00
-1-
2011/12
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[AK4955]
3. Power Management Function
• Thermal Shut Down
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, 512fs or 1024fs (MCKI pin)
5. Output Master Clock Frequency: 32fs/64fs/128fs/256fs
6. Sampling Frequencies
• PLL Slave Mode (BICK pin): 7.35kHz ~ 48kHz
• PLL Slave Mode (MCKI pin):
8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz
• PLL Master Mode:
8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz
• EXT Master/Slave Mode:
7.35kHz ~ 48kHz (256fs), 7.35kHz ∼ 48kHz (512fs), 7.35kHz ∼ 13kHz (1024fs)
7. μP I/F: 3-wire Serial, I2C Bus (Ver 1.0, 400kHz Fast-Mode)
8. Master/Slave Mode
9. 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
10. Video Functions
• One Composite Signal Input
• Cap-less Video Amplifier for Composite Signal Output
Gain: +6 / +9 / +12 / +16.5dB
• Low Pass Filter
• Charge Pump Circuit for Negative Power Supply
11. Ta = −30 ∼ 85°C
12. Power Supply:
• Analog Power Supply (AVDD): 2.7 ~ 3.6V
• Digital Power Supply (DVDD): 1.6 ~ 2.0V
• Line Output Power Supply (LVDD): 2.7 ~ 5.5V
• Speaker Power Supply (SVDD): 2.7 ~ 5.5V
• Digital I/O Power Supply (TVDD): DVDD-0.2 ~ 3.6V
13. Package: 36pin CSP (3.0 x 3.1mm, 0.5mm pitch)
MS1343-E-00
-2-
2011/12
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■ Block Diagram
[AK4955]
AVDD VSS1
REGFIL VCOM
DVDD TVDD VSS2
Internal
MIC
Ex ternal
MIC
MPWR
LIN1
RIN1
LIN2
RIN2
PMM P
MIC Power
Supply
PM MICL
MIC-Amp
PM MICR
LDO: 2.3V
PMADL or PMADR
A/D HPF
Analog Logic
MIC Power, Video-out-Amp
(DSP Block)
PMDSP
DSP1
Line Out
MIN
LOUT
ROUT
LVDD
Speaker
SVDD
VSS3
SPP
SPN
P ML O
PMBPE
PMBPG
BEEP
GEN
PMSPK
SPK-amp
Composite
Video Out
VOUT
PMCP
CLK
GEN
Charge
Pump
PMPFIL
PMDSP
H PF3
LPF
EQ0
4 Band EQ
Stereo Emphasis
ALC
1 Band EQ
DSP2
PM DAC
M ono/
D/A DEM Stereo SMUTE DVOL
PM V
LPF
+6/9/12/16.5dB
CLAMP
PVEE
VIN
Total: 36pin
Figure 1. Block Diagram
Audio
I/ F
PMPLL
PLL
Control
Regis ter
PDN
BICK
LRCK
SDTO
SDTI
MCKO
MCKI
CSN/ SDA
CCLK/SCL
CDTIO/CAD0
I2C
MS1343-E-00
-3-
2011/12
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