[ASAHI KASEI]
[AK7714]
M0018-E-00
`98/07
- 1 -
General Description
The AK7714 is a highly integrated audio processing IC with 20-bit stereo ADC and 4-channel DAC plus
on-chip DSP with 64-kbit delay RAM. The built-in ADC has a dynamic range of 99 dB with S/(N+D) of 92 dB,
and the DAC has a dynamic range of 98 dB with S/(N+D) of 89 dB, thereby ensuring high performances.
The AK7714 is compatible with each of the sampling frequencies of 48 kHz, 44.1 kHz or 32 kHz, and a
program of 512 steps (when sampling at 44.1 kHz or 32 kHz) can be executed in one sampling time. The
AK7714 is a programmable audio DSP containing RAM for delay. This allows sound field control programs to
be implemented for surround sound, echo 3D, parametric equalizer and the like.
Furthermore, the AK7714 uses a small 100-pin LQFP package, providing the optimum system for the sound
field of car audio equipment which is required to meet space saving requirements.
Features
DSP:
-
Word length:
24-bit (Data RAM)
-
Instruction cycle time:
44.2 ns
-
Multiplier: 24 x 16 40-bit
-
Divider: 24 / 24 16-bit
-
ALU:
34-bit arithmetic operation (Overflow margin: 4 bits)
24-bit arithmetic and logic operation
-
Shift+Register: 1, 2, 3, 4, 8 and 15 bits shifted left
1, 2, 3, 4, (6, 14), 8 and 15 bits shifted right
( )Numbers in parentheses are restricted.
Provided with indirect shift function
-
Program RAM: 448 x 32-bit
-
Coefficient RAM: 384 x 16-bit
-
Data RAM: 128 x 24-bit
-
Internal delay memory: 4096 x 16-bit or 2048 x 24-bit
-
Sampling frequency: 32 kHz to 48 kHz
-
Serial micro controller interface
-
Master clock: 512/384/256 fs (512 fs for sampling at 44.1 kHz or 32 kHz)
-
Master/slave operation
-
Serial signal input port (2 to 6 ch), output port (2 to 6 ch) : 16/20/24-bit
ADC: 2 channels
-
20-bit 64 x Over-sampling delta sigma
-
DR, S/N : 99 dB
-
S/(N+D) : 92 dB
-
Digital HPF (fc = 1 Hz)
DAC: 4 channels
-
20-bit 128 x Over-sampling delta sigma
-
DR, S/N : 98 dB
-
S/(N+D) : 89 dB
Others
-
Power voltage: + 5 V
5%
-
Operating temperature range: -40
C to +85
C
Package: 100-pin LQFP (0.5 mm pitch)
20-Bit Audio Codec with DSP and Delay RAM
AK7714
[ASAHI KASEI]
[AK7714]
M0018-E-00
`98/07
- 2 -
Block diagram
For standard operation (Internal connection mode, C3 to C7: initial settings)
CPCL
:L Internal connection mode
C3
C7
:All 0 (Initial settings)
This block diagram is a simplified illustration of the AK7714; it is not a circuit diagram.
[ASAHI KASEI]
[AK7714]
M0018-E-00
`98/07
- 5 -
(2) Pin function
Pin No.
Pin name
I/O
Function
Classification
3
TESTI1
I
Test pin: Leave open or connect to DVSS. (Pulldown)
4
TESTI2
I
Test pin: Leave open or connect to DVSS. (Pulldown)
5
TESTI3
I
Test pin: Leave open or connect to DVSS. (Pulldown)
6
TESTI4
I
Test pin: Leave open or connect to DVSS. (Pulldown)
Test
7
DVB
-
+5 V power supply
(Silicon substrate potential)
9
DVDD
-
+5 V Digital power supply
10,11
DVSS
-
Digital ground
Power supply
12
SDINA
I
DSP Serial data input pin (Pulldown)
OPCL="L": Disabled. Leave open or connect to DVSS.
OPCL="H": Compatible with MSB first 24 bits
14
SDOUTA
O
ADC Serial data output pin
OPCL="L": Outputs "L".
OPCL="H": Outputs MSB first 20-bit data.
15
SDOUTD1
O
DSP Serial data output pin
OPCL="L": Outputs "L".
OPCL="H": Outputs MSB first 24-bit data.
17
SDIND1
I
DAC1 Serial data input pin (Pulldown)
OPCL="L": Disabled. Leave open or connect to DVSS.
OPCL="H": Compatible with MSB first 20 bits
18
SDIND2
I
DAC2 Serial data input pin (Pulldown)
OPCL="L": Disabled. Leave open or connect to DVSS.
OPCL="H": Compatible with MSB first 20 bits
20
SDOUTD2
O
DSP Serial data output pin
OPCL="L": Outputs "L".
OPCL="H": Outputs MSB first 24-bit data.
21
SDOUT
O
DSP Serial data output pin
Outputs MSB first 24-bit data.
Digital section
Serial input/output
data
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