AD781 Analog Devices, AD781 Datasheet - Page 8

• Manufacturer Part Number: AD781
• Description: Complete 700 ns Sample-and-Hold Amplifier
• Manufacturer: Analog Devices

AD781
AD781 TO AD674 INTERFACE
Figure 9 shows a typical data acquisition circuit using the
AD781, a high linearity, low aperture jitter SHA and the AD674
a 12-bit high speed ADC. The time between the AD674 status
line going high and the actual start of conversion allows the
AD781 to settle to 0.01%. As a result, the AD674 status line
can be used to control the AD781; only an inverter is needed to
interface the two devices.
V
IN
0.1µF
0.1µF
3
2
GND
IN
V
CC
+12V
–12V
Figure 9. AD781 to AD674 Interface
1
5
V
AD781
EE
7
OUT
S/H
OR EQUIV.
CONVERT
7404
Cerdip (Q) Package
OFFSET
4 NC
6
8
GAIN
NC
+12V
4.7µF
100
100
NC
28
15
13
14
10
12
3
4
8
5
9
CE
STS
DGND
A
20 V
REF IN
BIP OFFSET
AGND
CS
10 V
REF OUT
R/C
6
0.1µF
0
7
IN
IN
12/8
AD674
2
0.1µF
D0–11
11
V
1
L
16
27
Dimensions shown in inches and (mm).
12-BIT
THREE-STATE
DATA
OUTLINE DIMENSIONS
STATUS
4.7µF
0.1µF
–12V
+5V
–8–
Figure 10. FFT Plot of AD781 to AD674 Interface,
F
IN
–100
–120
–140
–20
–40
–60
–80
20
= 1 kHz
0
0
3
7
Mini-DIP (N) Package
FREQUENCY BINS – kHz
10
13
16
20
23
26
30
REV. A
33