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PDF AK7770EQ Data sheet ( Hoja de datos )
| Número de pieza | AK7770EQ | |
| Descripción | Audio DSP | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK7770]
AK7770EQ
Audio DSP with Multi-Channel Audio CODEC
GENERAL DESCRIPTION
The AK7770 is a digital signal processor with an integrated 4-channel audio ADC and a 6-channel audio
DAC, as well as an S/PDIF transmitter. It utilizes an enhanced dual bit architecture that results in wide
dynamic range for the ADC, and the advanced multi-bit architecture of the DAC enables wide dynamic
range and low out-of-band noise. Two sample-rate converters are integrated, allowing for operation at
48kHz sampling rate with input rates of 32kHz, 44.1kHz, or 48kHz. Volume control, compression, EQ and
sound processing are performed by the DSP. In addition, delay adjustment up to 70ms is possible for four
output channels through the integrated delay RAM. The AK7770 is packaged in a space-saving 80-pin
LQFP package.
FEATURES
■ DSP
- Data Width: 24-bit (Data RAM F20.4 floating Point)
- Processing Speed: 13.5 ns (1536step/fs; fs = 48kHz)
- Multiplication: 20 x 16 → 36-bit Double precision arithmetic available
- Program RAM: 1536 x 36-bit
- Coefficient RAM: 1536 x 16-bit
- Offset RAM: 64 x 14-bit
- DRAM: 14kword (1word = F16.4 floating point)
- Sample Rate: fs = 48kHz
- Master / Slave operation
■ 4:2 Selector with Input Pre-amp
■ 4ch 24-bit ADC
- 64-times oversampling
- Sample Rate: 48kHz
- S/(N+D): 84dB (fs = 48kHz)
- DR, S/N: 96dB (fs = 48kHz)
- Digital HPF for offset DC cancellation
- Channel independent Digital Volume control (+24/-103dB, 0.5dB step)
- Soft Mute
■ 6ch 24-bit DAC
- 128-times oversampling
- Sample Rate: 48kHz
- S/(N+D): 88dB (fs = 48kHz )
- DR, S/N: 100dB
- Channel independent Digital Volume control (+12/-115dB, 0.5dBstep)
- Soft Mute
- Digital de-emphasis
MS0699-E-01-PB
-1-
2008/06
1 page  
■ Ordering Information
AK7770EQ
AKD7770
■ Pin Assignment
-10 ∼ +70°C
Evaluation board
80pin LQFP (0.5mm pitch)
[AK7770]
AOUTR1
AOUTL1
VSS1
AVDD
FRIR2
FROR2
FROL2
FRIL2
AINR1
AINL1
AINR2
AINL2
AINR3
AINL3
AINR4
AINL4
VSS1
VCOM
AVDD
FROR1
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
80 pin LQFP
(TOP VIEW)
40 SDA
39 DVDD18
38 VSS3
37 DVDD
36 SCL
35 CAD0
34 CAD1
33 SDIN2
32 BITCLK2
31 CLK2
30 LRCLK2
29 SDIN1
28 BITCLK1
27 CLK1
26 LRCLK1
25 DVDD18
24 VSS3
23 DVDD
22 XTI
21 XTO
pin
Input
Output
I/O
Power
MS0699-E-01-PB
-5-
2008/06
5 Page 
[AK7770]
■ DAC3 + HP Amp
(Ta=25°C; AVDD=HVDD=DVDD=3.3V; DVDD18=1.8V; VSS1=VSS2=VSS3=0V;
Signal frequency = 1kHz; Measurement bandwidth =20Hz~20kHz , fs=48kHz fs; SRC reset; fs=48kHzs)
Parameter
min typ max
Analog Volume Control Characteristics OPGA):
Units
Gain
Maximum (OPGA[4:0] bits= “1FH”)
-
+0
- dB
Minimum (OPGA[4:0] bits= “01H”)
-
-50
- dB
Step size
+0dB ∼ -16dB
0.1 1
- dB
-16dB ∼ -38dB
0.1 2
- dB
-38dB ∼ -50dB
- 4 - dB
Headphone-Amp Characteristics: DAC → HPL/HPR pins, RL=16Ω
Output Voltage
1.53 1.7 1.87 Vpp
S/(N+D)
(−3dBFS)
S/N (A-weighted)
Inter channel Isolation
Inter channel Gain Mismatch
Load Resistance
Load Capacitance
Load Capacitance
(RL, Figure 3)
(C1, Figure 3)
(C2, Figure 3)
63
80
60
-
16
-
-
73 - dB
86 - dB
80 - dB
0.1 0.5 dB
- -Ω
- 30 pF
- 300 pF
HP-Amp
−
+
HPL pin
HPR pin
C1
Measurement
Point
47μF
+
0.22μF C2
10Ω
RL
Figure 3. Headphone amplifier output circuit
MS0699-E-01-PB
- 11 -
2008/06
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AK7770EQ.PDF ] | |
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