Sharp DX-SX1H Service Manual page 64

DX-SX1H
IC902 VHiADC08351-1: A/D Converter (ADC08351)
Pin No. Terminal Name
1 OE
2 DGND
3-10 D0-D7
11 VD
12 CLK
13 VD
14 VREF
15 PD
16 VA
17 VIN
18, 19 AGND
20 DGND
V
14
REF
99
266
18k
V
17
IN
12k
26
AGND
18
CMOS/TTL compatible digital input terminal.
When this terminal is set to Low, digital output of ADC08351 becomes enable.
When this terminal is set to High, digital output changes to the high-impedance condition.
Ground return circuit terminal for digital power supply.
Conversion data output terminal. C0 shows LSB, and D7 shows MBS.
Effective data are output on data bus immediately after CLK input rising edge.
When OE terminal is set to Low, these terminals become enable.
Positive digital power voltage terminal. Connected to +3V power supply.
VA and VD are supplied from the common power supply.
CMOS/TTL compatible clock input terminal. VIN is sampled at CLK input trailing edge.
Positive digital power voltage terminal. Connected to +3V voltage power.
Positive reference voltage input terminal. Voltage of this terminal ranges from 0.75V to VA.
CMOS/TTL compatible digital input terminal.
When this terminal is set to High, ADC08351 enters the power down mode, minimizing power consumption.
When this is set to Low, the device enters the normal operation mode.
Positive analog power voltage terminal: To connect +3V voltage power.
Analog signal input. Convertible input ranges from 0.5Vp-p to 0.68Va.
Ground return circuit terminal for analog power supply.
Ground return circuit terminal for digital power supply.
V
A
16
Encoder and error correction
1
17
SWITCH
256
CLOCK
GENERATOR
12
CLK
Figure 64 BLOCK DIAGRAM OF IC
Function
+
V
D
13,11
17
ENCODER
ROUGH/FINE
AND
COMPARATOR
ERROR
CORRECTION
17
ENCODER
ROUGH/FINE AND
ERROR
COMPARATOR
CORRECTION
15
PD AGND DGND
– 64 –
+
8
8
OUTPUT
MUX
DRIVER
8
19 2,20
OE
8
DATA
3
OUT
10
(D0~D7)
1