AD781 데이터 시트보기 (PDF) - Analog Devices
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AD781 Datasheet PDF : 8 Pages
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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.
STATUS
+12V
0.1µF
7404
OR EQUIV.
6 21
CE 12/8 VL
28 STS
+5V
0.1µF
15 DGND
1
VCC
7
S/H 4 NC
3 CS
6 NC
4 A0 AD674
IN
VIN
2
OUT
8
3
GND
AD781
VEE
5
13 10 VIN
NC 14 20 VIN
16 12-BIT
D0–11
THREE-STATE
27 DATA
0.1µF
–12V
GAIN
100Ω
100Ω
10 REF IN
8 REF OUT
12 BIP OFFSET
OFFSET
CONVERT
+12V
4.7µF
5 R/C
9 AGND
7
11
0.1µF 0.1µF
–12V
4.7µF
Figure 9. AD781 to AD674 Interface
20
0
–20
–40
–60
–80
–100
–120
–140
0 3 7 10 13 16 20 23 26 30 33
FREQUENCY BINS – kHz
Figure 10. FFT Plot of AD781 to AD674 Interface,
FIN = 1 kHz
Cerdip (Q) Package
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Mini-DIP (N) Package
–8–
REV. A
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