®
®
ADS-941
N
START
CONVERT
50ns min., 100ns max
35ns max.
N+1
EOC
Conversion Time
600ns typ.
10ns typ.
INTERNAL S/H
Aquisition Time
Hold
350ns max.
30ns max.
OUTPUT
DATA DATA N-1 VALID
INVALID DATA
400ns max.
DATA N VALID
600ns min.
Scale is approximately 50ns per division.
Figure 2. ADS-941 Timing Diagram
Removing System Errors
Use external potentiometers to remove system errors or to
reduce the small initial errors to zero. Use a 100Ω trimpot in
series with the analog input for gain adjustment. Use a fixed
50Ω resistor instead of the trimpot for operation without
adjustment. Use a 20kΩ trimpot with the wiper tied to OFFSET
ADJUST (pin 5) for zero/offset adjustment. Connect pin 5 to
ANALOG GROUND (pin 6) for operation without zero/offset
adjustment.
ZERO/OFFSET
ADJUST
20k
Ω
+5V
–5V
+5V
4.7µF
0.1µF
10
DIGITAL
11 GROUND
5
OFFSET
ADJUST
4.7µF
+
+
+15V
12
0.1µF
6, 14, 15 ANALOG
GROUND
13
ADS-941
4.7µF
–15V
0.1µF
GAIN ADJUST
31 BIT 1 (MSB)
30 BIT 1 (MSB)
29 BIT2
28 BIT 3
27 BIT 4
26 BIT 5
25 BIT 6
24 BIT 7
23 BIT 8
22 BIT 9
21 BIT 10
20 BIT 11
19 BIT 12
18 BIT 13
17 BIT 14 (LSB)
7 OVERFLOW
16 EOC
0 to +10V
3 ANALOG INPUT
100
Ω
4 SIGNAL GROUND
CODING SELECT
1 +10V
REF. OUT
4.7µF
8
0.1µF
START CONVERT 32
ENABLE
BIPOLAR
9
2
Figure 3. ADS-941 Connection Diagram
4
CANDD [ C&D TECHNOLOGIES ]
