Kenwood TS-2000, Service Manual

Page: 47 / 171

47
TS-2000/X
CODEC (16 bit) : AK4518
(Control unit IC522,523)
■
Block diagram
∆∑
Modulator
Decimation
Filter
Clock
Divider
Serial I/O
Interface
Common
Voltage
8x
Interpolator
∆∑
Modulator
Decimation
Filter
∆∑
Modulator
LPF
8x
Interpolator
∆∑
Modulator
LPF
6
5
3
4
2
1
21
19
20
24 22 23 14 13
15
12
11
10
18
17
8
7
16
9 AINL
VCML
AINR
VCMR
VRAD
VRDA
VCOM
AOUTL
AOUTR
MCLK
CMODE
LRCK
SCLK
SDTO
SDTI
PWAD
PWDA
DEM1
DEM0
VA AGND VB VD DGND
No. Name I/O Function
17 DEM1 I De-emphasis frequency select pin.
18 DEM0 I De-emphasis frequency select pin.
19 AOUTL O Lch analog output pin.
20 AOUTR O Rch analog output pin.
21 VCOM O Common voltage output pin, 0.45 x VA.
Connect a 4.7
µ
F electrolytic capacitor
and 0.1
µ
F ceramic capacitor between
this pin and AGND.
22 AGND – Analog ground pin.
23 VB – Substrate pin.
24 VA – Analog power supply pin.
Amplifier : UPC2709TB
(TX-RX 2 unit IC405, 415,416, TX-RX 3 unit IC1)
■
Equivalent circuit
6 : Vcc
4 : OUT
2,5 : GND 3 : GND
1 : IN
■
Pin function
No. Name I/O Function
1 VRDA I Voltage reference input pin for DAC, VA.
2 VRAD I Voltage reference input pin for ADC, VA.
3 AINR I Rch analog input pin.
4 VCMR O Rch common voltage output pin,
0.45 x VA. Connect a 4.7
µ
F electrolytic
capacitor and 0.1
µ
F ceramic capacitor
between this pin and AGND.
5 VCML O Lch common voltage output pin,
0.45 x VA. Connect a 4.7
µ
F electrolytic
capacitor and 0.1
µ
F ceramic capacitor
between this pin and AGND.
6 AINL I Lch analog input pin.
7 PWAD I ADC power down mode pin.
“L” : Power down
8 PWDA I DAC power down mode pin.
“L” : Power down
9 MCLK I Master clock input pin.
10 LRCK I Input/output channel clock pin.
11 SCLK I Audio serial data clock pin.
12 SDTO O Audio serial data output pin.
13 DGND – Digital ground pin.
14 VD – Digital power supply pin.
15 SDTI I Audio serial data input pin.
16 CMODE I Master clock select pin.
“H” : 384fs or 512fs, “L” : 256fs
SEMICONDUCTOR DATA