ADS-942MC Murata Power Solutions Inc, ADS-942MC Datasheet - Page 4

• Manufacturer Part Number: ADS-942MC
• Description: Analog To Digital Converter
• Manufacturer: Murata Power Solutions Inc

ADS-942
Removing System Errors
Use external potentiometers to remove system errors or to
reduce the small initial errors to zero. Use a 100
series with the analog input for gain adjustment. Use a fixed
50
UNIPOLAR
+FS – 1 LSB
SCALE
+7/8 FS
+3/4 FS
+1/2 FS
+1/4 FS
+1/8 FS
+1 LSB
resistor instead of the trimpot for operation without
0
+9.999390
+8.750000
+7.500000
+5.000000
+2.500000
+1.250000
+0.000610
INPUT VOLT.
+15V
–15V
0.000000
0 to +10V
0 TO +10V
+5V
4.7µF
4.7µF
4.7µF
0.1µF
GAIN ADJUST
MSB
11 1111 1111 1111 00 0000 0000 0000
11 1000 0000 0000
11 0000 0000 0000
10 0000 0000 0000
01 0000 0000 0000
00 1000 0000 0000 11 0111 1111 1111
00 0000 0000 0001 11 1111 1111 1110
00 0000 0000 0000 11 1111 1111 1111
0.1µF
0.1µF
0.1µF
STRAIGHT BIN.
4.7µF
OFF. BINARY
100
6, 14, 15
10
12
13
3
11
4 SIGNAL GROUND
1
Figure 3. ADS-942 Connection Diagram
ANALOG INPUT
DIGITAL
GROUND
+10V REF. OUT
LSB
trimpot in
ANALOG
GROUND
Table 3. Output Coding
MSB
00 0111 1111 1111
00 1111 1111 1111
01 1111 1111 1111
10 1111 1111 1111
COMP. BINARY
COMP. OFF. BIN.
OUTPUT CODING
+15V
ZERO/OFFSET
ADS-942
ADJUST
OFFSET
ADJUST
20k
4
5
adjustment. Use a 20k
ADJUST (pin 5) for zero/offset adjustment. Connect pin 5 to
ANALOG GROUND (pin 6) for operation without zero/offset
adjustment.
–15V
START CONVERT
CODING SELECT
LSB
BIPOLAR
MSB
ENABLE
01 1111 1111 1111
01 1000 0000 0000
01 0000 0000 0000
00 0000 0000 0000
11 0000 0000 0000
10 1000 0000 0000
10 0000 0000 0001
10 0000 0000 0000
TWO'S COMP.
32
8
9
2
trimpot with the wiper tied to OFFSET
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
LSB
7
+5V
BIT 1 OUT (MSB)
BIT 1 OUT (MSB)
BIT 2 OUT
BIT 3 OUT
BIT 4 OUT
BIT 5 OUT
BIT 6 OUT
BIT 7 OUT
BIT 8 OUT
BIT 9 OUT
BIT 10 OUT
BIT 11 OUT
BIT 12 OUT
BIT 13 OUT
BIT 14 OUT (LSB)
OVERFLOW
EOC
INPUT VOLT.
+4.999390
+3.750000
+2.500000
–2.500000
–3.750000
–4.999390
–5.000000
0.000000
±5V
®
+FS – 1LSB
–FS+1LSB
BIPOLAR
SCALE
+3/4FS
+1/2FS
–1/2FS
–3/4FS
–FS
0
®