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PDF AK4955 Data sheet ( Hoja de datos )
| Número de pieza | AK4955 | |
| Descripción | 24bit Stereo CODEC | |
| Fabricantes | AKM | |
| Logotipo |  |
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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
1 page  
[AK4955]
PIN/FUNCTION
No Pin Name
Power Supply
E2 AVDD
D5 LVDD
F4 VCOM
E1
E4 VSS1
F2
B4 DVDD
B3 TVDD
F3 REGFIL
A4 VSS2
E6 SVDD
F5 VSS3
I/O
-
O
-
-
-
-
-
-
-
F1 PVEE
O
Audio Interface
A6 MCKI
I
A2 MCKO
O
B5 LRCK
I/O
A5 BICK
I/O
B6 SDTI
I
A3 SDTO
O
Control Register Interface
B1
CSN
SDA
A1
CCLK
SCL
B2
CDTIO
CAD0
D2 I2C
I
I/O
I
I
I/O
I
I
Function
Analog Power Supply Pin, 2.7 ~ 3.6V
Lineout-Amp Power Supply Pin, 2.7 ~ 5.5V
Common Voltage Output Pin
Bias voltage of ADC inputs and DAC outputs.
Ground 1 Pin
Digital Power Supply Pin, 1.6 ~ 2.0V
Digital Interface Supply Pin, DVDD-0.2 ~ 3.6V
LDO Voltage Output pin for Analog Logic (typ 2.3V)
This pin must be connected to VSS1 with 2.2μF ±50% capacitor in series.
Ground 2 Pin
Speaker-Amp Power Supply Pin, 2.7 ~ 5.5V
Ground 3 Pin
Negative Charge Pump Output Pin
Connect to VSS1 with a 2.2μF capacitor which is low ESR (Equivalent Series
Resistance) over all temperature range.
Master Clock Input Pin (Note 1)
Master Clock Output Pin
Channel Clock Pin (Note 1)
Audio Serial Data Clock Pin (Note 1)
Audio Serial Data Input Pin (Note 1)
Audio Serial Data Output Pin
Chip Select Pin
(I2C pin = “L”) (Note 1)
Control Data Input/Output Pin
(I2C pin = “H”) (Note 1)
Control Data Clock Pin
(I2C pin = “L”) (Note 1)
Control Data Clock Pin
(I2C pin = “H”) (Note 1)
Control Data Input/Output Pin
(I2C pin = “L”) (Note 1)
Chip Address Select Pin
(I2C pin = “H”) (Note 1)
Control Mode Select Pin “H”: I2C Bus, “L”: 3-wire Serial (Note 1)
MS1343-E-00
-5-
2011/12
5 Page 
[AK4955]
Parameter
Video Signal Input
External Resistor (Note 21) R1 (Figure 2)
External Capacitor
C1 (Figure 2)
Maximum Input Voltage: VG1-0 bits = “00” (+6dB)
Pull Down Current
Video Analog Output (Figure 3)
min typ max Unit
- - 600 Ω
0.05 0.1 0.2 μF
- 1.0 1.24 Vpp
- 0.5 - μA
Output Gain
VG1-0 bits = “00”, 1.0Vpp Input
fin =100kHz
VG1-0 bits = “01”, 0.7Vpp Input
Sine wave Input
(Note 20)
VG1-0 bits = “10”, 0.5Vpp Input
VG1-0 bits = “11”, 0.3Vpp Input
DC Output Offset Level
(Note 20)
Signal Input
(Pedestal Level)
No Signal Input
S/N (Note 22)
VG1-0 bits = “00”(+6dB)
BW = 100kH ∼ 6MHz,
S = 0.7Vpp Input
Maximum Output Voltage
(Note 20)
fin =100kHz (Sine wave)
Secondary Harmonic Distortion
VG1-0 bits = “00”(+6dB), fin = 3.58MHz,
1.0Vpp: −40 ~ 100IRE, Sine Wave Input
5.5
8.5
11.5
16
−100
-
60
2.62
-
6.0
9.0
12.0
16.5
0
−572
70
-
−40
6.5
9.5
12.5
dB
17
100 mV
- mV
- dB
- Vpp
−30 dB
Load Resistance
140 150
-Ω
Load Capacitance
C2 (Figure 3)
- - 15 pF
C3 (Figure 3)
- - 400 pF
PSRR
fin = 10kHz
- 58 - dB
VG1-0 bits = “00”(+6dB)
fin = 100kHz
- 53 - dB
LPF for VIN signal : (Note 20)
Frequency Response (fin = 100kHz, 1.0Vpp, Sine wave Input)
Response at 6.75MHz
Response at 27MHz
−3.0
-
−0.5
−40
+2.0
−20
dB
Group Delay
|GD3MHz−GD6MHz|
- 15 100 ns
Note 20. This is a value at measurement point in Figure 3. 1.0Vpp input is the value when VG1-0 bits =“00”. Input
amplitude is in inverse proportion to the gain. S/N is measured at measuring point 2.
Note 21. PMV bit must be set to “0” if the input impedance of the VIN pin exceeds 600Ω in case of the input signal is
stopped or the input circuit of the VIN pin is powered down.
Note 22. S/N = 20xlog (Output Voltage[Vpp]/Noise Level[Vrms]). Output Voltage = 0.7 [Vpp].
VIN pin
From Video DAC
R1 C1
AK4955
Figure 2. External Resistor of Video Signal Input pin
Measurement point1
Video Signal Output
C2
75 ohm
R2
C3
Measurement point2
R3
75 ohm
Figure 3. Load Capacitance C2 and C3
MS1343-E-00
- 11 -
2011/12
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4955.PDF ] | |
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