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PDF AK7738 Data sheet ( Hoja de datos )
| Número de pieza | AK7738 | |
| Descripción | Multi DSP | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK7738]
AK7738
Multi DSP with 5ch ADC + 4ch DAC + 8ch SRC
1. General Description
The AK7738 is a highly integrated digital signal processor, including a 24-bit stereo ADC with MIC gain
amplifiers, a 24-bit stereo ADC with input selector, a monaural ADC, two 32-bit stereo DACs, 4 stereo
sampling rate convertors supporting the sampling frequency up to 192kHz, two DSPs and a Sub DSP for
Audio/HF process. Each two DSPs and a Sub DSP has 2560step/fs (when fs=48kHz) parallel processing
power. The AK7738 is capable of processing sound and voice such as for hands-free function simultaneously
because two DSPs are able to work on different but synchronized sampling frequencies. As the AK7738 is a
RAM based DSP, it is freely programmable for user requirements, such as acoustic effects and proprietary
high performance hands-free function. The AK7738 is available in a 64-pin LQFP package.
2. Features
□ DSP1/DSP2: (Memory areas are shared by DSP1 and DSP2)
- Word length:
28-bit (Simple floating point supported)
- Instruction cycle:
- Multiplier:
8.1ns (2560fs at fs=48kHz)
24 x 24 → 48-bit (Double precision arithmetic available)
- Divider:
24 / 24 → 24-bit (Floating point normalization function)
- ALU:
52-bit arithmetic operation (with 4bits overflow margin)
- Program RAM:
8192 word x 36-bit
- Coefficient RAM:
6144 word x 24-bit
- Data RAM:
6144 word x 28-bit
- Delay RAM:
20480 word x 28-bit
- JX pins (Interrupt)
- Clock Mode Selector for DSP1, DSP2
- Independent Power Management Function for DSP1, DSP2
□ Sub DSP
- Word length:
28-bit (Simple floating point supported)
- Instruction cycle:
- Multiplier:
- Divider:
8.1ns (2560fs at fs=48kHz)
24 x 24 → 48-bit (Double precision arithmetic available)
24 / 24 → 24-bit (Floating point normalization function)
- ALU:
52-bit arithmetic operation (with 4bits overflow margin)
- Program RAM:
1024 word x 36-bit
- Coefficient RAM:
2048 word x 24-bit
- Data RAM:
4096 word x 28-bit
□ ADC1: 24-bit Stereo ADC with MIC Gain Amplifiers
- Sampling Frequency: fs=8kHz to 192kHz
- Channel Independent Analog Gain Amplifiers
(0 to 18dB(2dB Step), 18 to 36dB(3dB step))
- Differential Input or Single-ended Input
- ADC Characteristics S/N: 102dB (fs=48kHz, Differential Input, MIC Gain=0dB,)
- Channel Independent Digital Volume Control (+24 to -103dB, 0.5dB Step, Mute)
- Analog DRC (Dynamic Range Control)
- Digital HPF for DC Offset Cancelling
- Low Noise MIC Power Output: 2ch
- 4 types of Digital Filter for Sound Color Selection
015000122-E-00-PB
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2015/01
1 page  
■ DSP1 Block Diagram
[AK7738]
Pointer CP0, CP1
DP0, DP1
Coefficient RAM
6144w×24Bit max
2048w Unit
Data RAM
6144w x 28Bit max
2048w Unit
CBUS(24Bit)
DBUS(28Bit)
DLP0, DLP1
OFREG
64w x 15Bit
Delay RAM
20480w x 28Bit max
4096w Unit
MPX24
MPX24
XY
Multiply
24×24 → 48Bit
48Bit
28Bit
52Bit
MUL DBUS
SHIFT
48Bit
AB
ALU
52Bit
Overflow Margin: 4Bit
52-Bit
DR0 3
52Bit
Over Flow Data
Generator
Micon I/F
Control
Serial I/F
DEC
Program RAM
8192w×36Bit max
2048w Unit
PC
Stack: 5 Level (max)
TMP 12×28Bit
PTMP(LIFO) 6×28Bit
2 x 24Bit
2 x 24Bit
2 x 24Bit
2 x 24Bit
2 x 24Bit x fifo12
2 x 24Bit x fifo12
DIN6
DIN5
DIN4
DIN3
DIN2
DIN1
2 x 32Bit
2 x 32Bit
2 x 32Bit
2 x 32Bit
2 x 32Bit x fifo12
2 x 32Bit x fifo12
DOUT6
DOUT5
DOUT4
DOUT3
DOUT2
DOUT1
28bit x fifo16 DTMP (Connect to DSP2)
28bit x fifo8 CTMP (Connect to Sub DSP)
Division 2424→24 Peak Detector
Figure 2. DSP1 Block Diagram (Note 1)
Note 1. Coefficient RAM, Data RAM, Delay RAM, Program RAM areas are shared by DSP1 and DSP2 and
the sizes are configurable by control registers.
015000122-E-00-PB
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5 Page 
[AK7738]
No.
Pin
Name
I/O Function
42 AINMN I ADCM Inverted Differential Input Pin
AINMP
43
AINM
I ADCM Non-inverted Differential Input Pin
I ADCM Single-ended Input Pin
44 AIN5R
I ADC2 Rch Pseudo Differential Input 5 Pin
45 GNDIN5 I ADC2 Pseudo Differential Ground Input 5 Pin
46 AIN5L
I ADC2 Lch Pseudo Differential Input 5 Pin
AIN2RN
47
AIN4R
I ADC2 Rch Inverted Differential Input 2 Pin
I ADC2 Rch Single-ended Input 4 Pin
AIN2RP
48
AIN3R
I ADC2 Rch Non-inverted Differential Input 2 Pin
I ADC2 Rch Single-ended Input 3 Pin
AIN2LN
49
AIN4L
I ADC2 Lch Inverted Differential Input 2 Pin
I ADC2 Lch Single-ended Input 4 Pin
AIN2LP
50
AIN3L
I ADC2 Lch Non-inverted Differential Input 2 Pin
I ADC2 Lch Single-ended Input 3 Pin
51 INN2
I ADC1 Rch Inverted Differential Input 2 Pin
AIN1R
52
INP2
I ADC1 Rch Single-ended Input 1 Pin
I ADC1 Rch Non-inverted Differential Input 2 Pin
53 INN1
I ADC1 Lch Inverted Differential Input 1 Pin
AIN1L
54
INP1
I ADC1 Lch Single-ended Input 1 Pin
I ADC1 Lch Non-inverted Differential Input 1 Pin
55 MPREF
56 MPWR1
Ripple Filter Pin for Microphone Power Supply
O Connect a 1uF ceramic capacitor between this pin and AVSS.
Do not connect this pin to an external circuit.
O
Power Supply Output 1 Pin for Microphone
This pin outputs “Hi-Z” during power-down state.
57 MPWR2
O
Power Supply Output 2 Pin for Microphone
This pin outputs “Hi-Z” during power-down state.
58 AVDD
- Analog Power Supply Pin 3.0~3.6V (typ.3.3V)
59 AVSS
- Analog Ground Pin 0V (Substrate potential)
Analog Common Voltage Output Pin
60 VCOM
O
Connect a 2.2uF ceramic capacitor between this pin and AVSS.
Do not connect this pin to an external circuit.
This pin outputs “L” during power-down state.
61 VREFH
I
Analog High-level Reference Voltage Input Pin
Connect this pin to AVDD.
62 VREFL
I
Analog Low-level Reference Voltage Input Pin
Connect this pin to AVSS.
63 AOUT1R
O
DAC1 Rch Analog Output Pin
This pin outputs “Hi-Z” during power-down state.
64 AOUT1L
O
DAC1 Lch Analog Output Pin
This pin outputs “Hi-Z” during power-down state.
015000122-E-00-PB
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2015/01
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK7738.PDF ] | |
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