AD707JR-REEL7 データシートの表示（PDF） - Analog Devices
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AD707JR-REEL7 Datasheet PDF : 8 Pages
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AD707
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.
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.
R3
100kΩ
R4
100kΩ
+VS 0.1µF
RSCALE = 10 mV/10 mA = 1 Ω
IERROR due to the AD707C:
Maximum IERROR = 2(VOS)/RSCALE + 2(VOS Drift)/RSCALE +
2
7
IOS (100 k/RSCALE)
OBSOLETE VIN
AD707
6
3
4 0.1µF
R1
100kΩ
–VS
R2
100kΩ
( ) tL
=
VIN
–––––––
RSCALE
R2
–––
R1
RSCALE
RL
IL
Figure 26. Precision Current Source/Sink
= 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.
8-Pin Metal Can
(H-08A)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin Plastic DIP
(N-8)
0.185 (4.70)
0.165 (4.19)
0.050
(1.27)
MAX
REFERENCE PLANE
0.750 (19.05)
0.500 (12.70)
0.250 (6.35)
MIN
0.100
(2.54)
BSC
5
0.160 (4.06)
0.110 (2.79)
0.335 (8.51)
0.305 (7.75)
0.370 (9.40)
0.335 (8.51)
4
0.200
(5.08)
3
BSC
2
6
0.045 (1.14)
7 0.027 (0.69)
8
0.040 (1.02) MAX
0.045 (1.14)
0.010 (0.25)
0.019 (0.48)
0.016 (0.41)
0.100
(2.54)
BSC
0.021 (0.53)
0.016 (0.41)
BASE & SEATING PLANE
1
0.034 (0.86)
0.027 (0.69)
45 °
BSC
0.005 (0.13) MIN
8-Pin Cerdip
(Q-8)
0.055 (1.4) MAX
8
PIN 1
1
5
0.310 (7.87)
0.220 (5.59)
4
0.200
(5.08)
MAX
0.200 (5.08)
0.125 (3.18)
0.405 (10.29) MAX
0.060 (1.52)
0.015 (0.38)
0.150
(3.81)
MIN
0.023 (0.58) 0.100 0.070 (1.78)
0.014 (0.36) (2.54) 0.030 (0.76)
BSC
SEATING
PLANE
0.320 (8.13)
0.290 (7.37)
0.015 (0.38)
0.008 (0.20)
15°
0°
–8–
0.430 (10.92)
0.348 (8.84)
8
5 0.280 (7.11)
1
4 0.240 (6.10)
0.325 (8.25)
PIN 1
0.060 (1.52)
0.300 (7.62)
0.210 (5.33)
0.015 (0.38)
MAX
0.130
0.160 (4.06)
(3.30)
0.115 (2.93)
MIN
0.022 (0.558)
0.100
0.070 (1.77)
SEATING
PLANE
0.014 (0.356) (2.54) 0.045 (1.15)
BSC
0.195 (4.95)
0.115 (2.93)
0.015 (0.381)
0.008 (0.204)
8-Lead SOIC
(SO-8)
0.1968 (5.00)
0.1890 (4.80)
8
0.1574 (4.00)
0.1497 (3.80) 1
5
0.2440 (6.20)
4 0.2284 (5.80)
PIN 1
0.0098 (0.25)
0.0040 (0.10)
0.0688 (1.75)
0.0532 (1.35)
0.0196
0.0099
(0.50)
(0.25)
x
45°
SEATING
PLANE
0.0500 0.0192 (0.49)
(1.27) 0.0138 (0.35)
BSC
0.0098 (0.25)
0.0075 (0.19)
8°
0° 0.0500 (1.27)
0.0160 (0.41)
REV. B
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