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PDF AK4678 Data sheet ( Hoja de datos )
| Número de pieza | AK4678 | |
| Descripción | Stereo CODEC | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK4678]
AK4678
24bit Stereo CODEC with MIC/RCV/HP/SPK/LINE-AMP
GENERAL DESCRIPTION
The AK4678 is a 24bit stereo CODEC with a built-in Microphone-Amplifier, Receiver-Amplifier, Mono
Class-D Speaker-Amplifier, Cap-less Class-G Headphone-Amplifier and Line-Amplifier. The AK4678
features dual PCM I/F in addition to audio I/F that allows easy interfacing in mobile phone designs with
Bluetooth I/F. The playback features also include 5-band Parametric EQ and Dynamic Range Control,
therefore the AK4678 can automatically adjust a comfortable volume without distortion and provides
great flexibility. The AK4678 is available in a 49pin CSP, utilizing less board space than competitive
offerings.
FEATURES
1. Recording Function (Stereo CODEC)
4 Stereo Input Selectors
4 Stereo Inputs (Single-ended) or 3 Mono Input (Full-differential)
MIC Amplifier: +24dB ~ 6dB, 3dB step
2 Output MIC Power Supplies
Digital ALC (Automatic Level Control): +36dB ~ 54dB, 0.375dB Step, Mute
ADC CHARACTERISTICS: S/(N+D): 80dB, DR, S/N: 87dB (MIC-Amp=+18dB)
S/(N+D): 80dB, DR, S/N: 92dB (MIC-Amp=0dB)
Stereo Digital MIC Interface
Wind-noise Reduction Filter
Stereo Separation Emphasis
3-band Programmable Notch Filter
Audio Interface Format: 24/16bit MSB justified, 24/16bit I2S, 16bit DSP Mode
2. Playback Function (Stereo CODEC)
Digital Volume (+6dB ~ 57.0dB, 0.5dB Step, Mute)
Digital ALC (Automatic Level Control): +36dB ~ 54dB, 0.375dB Step, Mute
Stereo Separation Emphasis
Dynamic Range Control
5-band Parametric Equalizer
Stereo Line Output (Selectable Full-differential / Single-ended)
Mono Receiver-Amp
- BTL Output
- Output Power: 60mW @ 32
- Analog Volume: +12 ~ 30dB & Mute, 3dB Step
Cap-less Stereo Class-G Headphone-Amp
- Output Power: 25mW @ 32, 45mW @ 16
- Analog Volume: +6 ~ 62dB & Mute, 2dB Step
- Zero crossing Detection
- Pop Noise Free at Power-ON/OFF
Mono Class-D Speaker-Amp
- BTL Output
- Short Protection Circuit
- Output Power: 1.1W @ 8, SVDD=4.2V, THD+N = 10%
0.89W @ 8, SVDD=4.2V, THD+N = 1%
- Analog Volume: +12 ~ 30dB & Mute, 3dB Step
- Pop Noise Free at Power-ON/OFF
Audio Interface Format:
- 24/16bit MSB justified, 16bit LSB justified, 16/24bit I2S, 16bit DSP Mode
MS1403-E-04
-1-
2014/12
1 page  
■ Ordering Guide
AK4678ECB
AKD4678
■ Pin Layout
[AK4678]
30 +85C
49pin CSP (0.4mm pitch) Black type
Evaluation board for AK4678
7
6
5
Top View
4
3
2
1
7
6
5
4
3
2
1
MS1403-E-04
A B C D E FG
CNB
CPB
TVDD
SDTO
BICK
MCKI
BICKB
A
CNA
CPA
VSS2
SCL
SDTI
SYNCB
SDTIB
B
VEE HPR
PVDD
HPL
SDA
LIN4
PDN
RIN4
LRCK
SYNCA
SDTOB BICKA
SDTOA SDTIA
CD
LIN3
/IN3+
RIN3
/IN3
RIN2
/IN2+
LOUT
/LOP
ROUT
/LON
SPFIL
LIN1/IN1+
/DMDAT
LIN2
/IN2
RIN1/IN1
/DMCLK
VSS1
VCOM
AVDD
MPWR1 MPWR2
RCP RCN
SVDD
SPN
DVDD
SPP
VSS3
EFG
Top View
-5-
2014/12
5 Page 
[AK4678]
Parameter
min typ max Unit
Stereo DAC Characteristics:
Resolution
- - 24 Bits
Stereo Line Output Characteristics: Stereo DAC LOUT/ROUT pins, ALC=OFF, IVOL=0dB, OVOL=0dB,
Output Voltage (Note 15)
LVL=0dB, RL=10k; unless otherwise specified.
1.62 1.8
1.98
Vpp
S/(N+D) (0dBFS)
70 80
- dB
S/N (A-weighted)
82 92
- dB
Interchannel Isolation
80 95
- dB
Interchannel Gain Mismatch
- 0 0.8 dB
Load Resistance
10 -
- k
Load Capacitance
- - 30 pF
PSRR (Note 16)
217Hz
- 75
- dB
1kHz
- 75
- dB
Mono Line Output Characteristics: Stereo DAC LOP/LON pins, ALC=OFF, IVOL=0dB, OVOL=0dB, LVL=0dB,
LODIF bit = “1”, RL=10k for each pin (Full-differential)
Output Voltage (Note 17)
3.24 3.6
3.96 Vpp
S/(N+D) (0dBFS)
- 73
- dB
S/N (A-weighted)
- 95
- dB
Load Resistance (LOP/LON pins, respectively)
(Note 18)
10
-
- k
Load Capacitance (LOP/LON pins, respectively)
(Note 19)
-
-
30 pF
PSRR (Note 16)
217Hz
- 70
- dB
1kHz
- 70
- dB
Mono Receiver-Amp Output Characteristics:
DAC(Stereo, Note 20) RCP/RCN pins, ALC=OFF, IVOL=0dB, OVOL=0dB, RCVG=6dB, RL=32, BTL; unless
otherwise specified.
Output Voltage (Note 21)
0dBFS
1.76 1.96
2.16 Vpp
0dBFS, RCVG=0dB
- 3.91
- Vpp
S/(N+D)
0dBFS
40 59
- dB
0dBFS, RCVG=0dB
S/N (A-weighted) (DAC RCP/RCN pins)
- 55
84 94
- dB
- dB
Output Noise Level (A-weighted, RCVG = 9dB)
-
100
- dBV
Load Resistance
32 -
-
Load Capacitance (Note 19)
- - 30 pF
PSRR (Note 16)
217Hz
- 75
- dB
1kHz
- 75
- dB
Note 15. Output voltage is proportional to AVDD voltage. Vout = 1.0 x AVDD Vpp(typ)
Note 16. PSRR is referred to SVDD with 200mVpp sine wave.
Note 17. Output voltage is proportional to AVDD voltage. Vout = (LOP) – (LON) = 2.0 x AVDD Vpp(typ)
Note 18. This is a resistance value between output pin and VSS1. When a resistor is connected between output pins, load
resistance for each output pin is half. Therefore, it is necessary to decide load resistance in consideration of these.
Note 19. This is a capacitance value between output pin and VSS1. When a capacitor is connected between output pins,
load capacitance for each output pin doubles. Therefore, it is necessary to decide load capacitance in
consideration of these.
Note 20. Input signal of left and right channels is same phase and level.
Note 21. Output voltage is proportional to AVDD voltage. Vout = (RCP) – (RCN) = 2.17 x AVDD Vpp(typ)
Po = 15mW @ 32, Vout = 1.96Vpp. Po = 60mW @ 32, Vout = 3.91Vpp.
MS1403-E-04
- 11 -
2014/12
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4678.PDF ] | |
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