AD817ARZ-REEL 查看數據表（PDF） - Analog Devices
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AD817ARZ-REEL Datasheet PDF : 14 Pages
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AD817
HIGH SPEED DAC BUFFER
The wide bandwidth and fast settling time of the AD817 make
it a very good output buffer for high speed current output D/A
converters like the AD668. As shown in Figure 38, the op amp
establishes a summing node at ground for the DAC output. The
output voltage is determined by the amplifier’s feedback resistor
(10.24 V for a 1 kΩ resistor). Note that since the DAC gener-
ates a positive current to ground, the voltage at the amplifier
output will be negative. A 100 Ω series resistor between the
noninverting amplifier input and ground minimizes the offset
effects of op amp input bias currents.
1 MSB
+15V
10µF
VCC 24
0.1µF
TO ANALOG
GROUND PLANE
2
REFCOM 23
3
REFIN1 22
4
REFIN2 21
5
DIGITAL
INPUTS 6
I OUT 20
AD668
RLOAD 19
7
ACOM 18
8
LCOM 17
9
IBPO 16
10
VEE 15
11
THCOM 14
12 LSB
VTH 13
1V NOMINAL
REFERENCE INPUT
10kΩ
1kΩ
100Ω
AD817
ANALOG GROUND PLANE
0.1µF
10µF
–15V
ANALOG
OUTPUT
ANALOG
SUPPLY
GROUND
100pF
1kΩ
+5V
Figure 38. High Speed DAC Buffer
8-Pin Plastic Mini-DIP
(N-8)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin SOIC
(SO-8)
8
PIN 1
1
5
0.25
(6.35) 0.31
(7.87)
4
0.39 (9.91) MAX
0.165±0.01
(4.19±0.25)
0.035±0.01
(0.89±0.25)
0.125
(3.18)
MIN
0.18±0.03
(4.57±0.76)
0.018±0.003
(0.46±0.08)
0.10
(2.54)
BSC
0.033
(0.84)
NOM
SEATING
PLANE
0.30 (7.62)
REF
0.011±0.003
(0.28±0.08)
15°
0°
8
PIN 1
1
5
0.1574 (4.00)
0.1497 (3.80)
4
0.2440 (6.20)
0.2284 (5.80)
0.0098 (0.25)
0.0040 (0.10)
0.1968 (5.00)
0.1890 (4.80)
0.0196 (0.50)
0.0099 (0.25)
x 45°
0.0688 (1.75)
0.0532 (1.35)
0.0500 0.0192 (0.49)
(1.27)
BSC
0.0138 (0.35)
8°
0.0098 (0.25) 0°
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
–12–
REV. B
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