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AD707KN Folha de dados(PDF) 8 Page - Analog Devices

Nome de Peças AD707KN
Descrição Electrónicos  Ultralow Drift Op Amp
Download  8 Pages
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD707KN Folha de dados(HTML) 8 Page - Analog Devices

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AD707
REV. B
–8–
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin Metal Can
(H-08A)
45
°
BSC
0.100
(2.54)
BSC
0.034 (0.86)
0.027 (0.69)
0.045 (1.14)
0.027 (0.69)
0.160 (4.06)
0.110 (2.79)
0.100
(2.54)
BSC
0.200
(5.08)
BSC
6
8
5
7
1
4
2
3
REFERENCE PLANE
BASE & SEATING PLANE
0.335 (8.51)
0.305 (7.75)
0.370 (9.40)
0.335 (8.51)
0.750 (19.05)
0.500 (12.70)
0.045 (1.14)
0.010 (0.25)
0.050
(1.27)
MAX
0.040 (1.02) MAX
0.019 (0.48)
0.016 (0.41)
0.021 (0.53)
0.016 (0.41)
0.185 (4.70)
0.165 (4.19)
0.250 (6.35)
MIN
8-Pin Cerdip
(Q-8)
0.320 (8.13)
0.290 (7.37)
0.015 (0.38)
0.008 (0.20)
15
°
0
°
0.005 (0.13) MIN
0.055 (1.4) MAX
1
PIN 1
4
5
8
0.310 (7.87)
0.220 (5.59)
0.405 (10.29) MAX
0.200
(5.08)
MAX
SEATING
PLANE
0.023 (0.58)
0.014 (0.36)
0.070 (1.78)
0.030 (0.76)
0.060 (1.52)
0.015 (0.38)
0.150
(3.81)
MIN
0.200 (5.08)
0.125 (3.18)
0.100
(2.54)
BSC
8-Pin Plastic DIP
(N-8)
8
14
5
0.430 (10.92)
0.348 (8.84)
0.280 (7.11)
0.240 (6.10)
PIN 1
SEATING
PLANE
0.022 (0.558)
0.014 (0.356)
0.060 (1.52)
0.015 (0.38)
0.210 (5.33)
MAX
0.130
(3.30)
MIN
0.070 (1.77)
0.045 (1.15)
0.100
(2.54)
BSC
0.160 (4.06)
0.115 (2.93)
0.325 (8.25)
0.300 (7.62)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.115 (2.93)
8-Lead SOIC
(SO-8)
0.1968 (5.00)
0.1890 (4.80)
8
5
4
1
0.2440 (6.20)
0.2284 (5.80)
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.0688 (1.75)
0.0532 (1.35)
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.0500
(1.27)
BSC
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8
°
0
°
0.0196 (0.50)
0.0099 (0.25)
x 45
°
PRECISION CURRENT TRANSMITTER
The AD707’s excellent dc performance, especially the low offset
voltage, low offset voltage drift and high CMRR, makes it
possible to make a high precision voltage-controlled current
transmitter using a variation of the Howland Current Source
circuit (Figure 26). This circuit provides a bidirectional load
current which is derived from a differential input voltage.
6
2
3
+VS
AD707
0.1µF
–VS
4
0.1µF
7
R4
100k
R3
100k
R2
100k
R1
100k
RL
IL
RSCALE
VIN
VIN
RSCALE
tL = –––––––
–––
( )
R2
R1
Figure 26. Precision Current Source/Sink
The performance and accuracy of this circuit will depend almost
entirely on the tolerance and selection of the resistors. The scale
resistor (RSCALE) and the four feedback resistors directly affect
the accuracy of the load current and should be chosen carefully
or trimmed.
As an example of the accuracy achievable, assume IL must be
10 mA, and the available VIN is only 10 mV.
RSCALE = 10 mV/10 mA = 1
IERROR due to the AD707C:
Maximum IERROR = 2(VOS)/RSCALE + 2(VOS Drift)/RSCALE +
IOS (100 k/RSCALE)
= 2 (15
µV)/l Ω +2 (0.1 µV/°C)/l Ω
+ 1 nA (100 k)/l
Ω (1.5 nA @ 125°C)
= 30
µA + 0.2 µA/°C + 100 µA
(150
µA @ 125°C)
= 130
µA/10 mA = 1.3% @ 25°C
= 180
µA/10 mA = 1.8% @ 125°C
Low drift, high accuracy resistors are required to achieve high
precision.


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