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參數(shù)資料
| 型號： | 5962-9322201MEA |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | VOLTAGE-FREQUENCY CONVERTER, 4 MHz, CDIP16 |
| 封裝： | CERDIP-16 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 956K |
| 代理商： | 5962-9322201MEA |
AD652
REV. B
–16–
C1049b
–
0
–
2/00
(rev.
B)
Figure 30. Delta Modulator lnput Signal and Ramp-Wise
Approximation
Figure 31. Delta Modulator Input Signal, Ramp-Wise
Approximation and Output Frequency
Figure 32. Maximum Integrating Cap Value vs. Input
Signal Bandwidth
BRIDGE TRANSDUCER INTERFACE
The circuit of Figure 33 illustrates a simple interface between
the AD652 and a bridge-type transducer. The AD652 is an
ideal choice because its buffered 5 volt reference can be used as
the bridge excitation thereby ratiometrically eliminating the gain
drift related errors. This reference will provide a minimum of
10 mA of external current, which is adequate for bridge resis-
tance of 600
and above. If, for example, the bridge resistance
is 120
or 350 , an external pull-up resistor (R
PU) is required
and can be calculated using the formula:
RPU (max )
=
+VS – 5V
5 V
RBRIDGE
– 10 mA
An instrumentation amplifier is used to condition the bridge sig-
nal before presenting it to the SVFC. The AD625, with its high
CMRR, minimizes common-mode errors and also can be set to
arbitrary gains between 1 and 10,000 via three resistors, simpli-
fying the scaling for the AD652’s calibrated 10 volt input range.
These resistors should be selected such that the following equa-
tion holds:
10 V
= VBRIDGE
2 RF
RG
+1
where 10 k
≤ RF ≤ 20 k, and VBRIDGE is the maximum
output voltage of the bridge.
The bridge output may be unipolar, as is the case for most
pressure transducers, or it may be bipolar as in some strain mea-
surements. If the signal is unipolar, the reference input of the
AD625 (Pin 7) is simply grounded. If the bridge has a bipolar
output, however, the AD652 reference can be tied to Pin 7,
thereby, converting a
±5 volt signal (after gain) into a 0 volt to
+10 volt input for the SVFC.
Figure 33. Bridge Transducer Interface
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Cerdip
(Q-16)
16
1
8
9
0.310 (7.87)
0.220 (5.59)
PIN 1
0.005 (0.13) MIN
0.080 (2.03) MAX
SEATING
PLANE
0.023 (0.58)
0.014 (0.36)
0.200 (5.08)
MAX
0.840 (21.34) MAX
0.150
(3.81)
MIN
0.070 (1.78)
0.030 (0.76)
0.200 (5.08)
0.125 (3.18)
0.100
(2.54)
BSC
0.060 (1.52)
0.015 (0.38)
15°
0°
0.320 (8.13)
0.290 (7.37)
0.015 (0.38)
0.008 (0.20)
PLCC
(P-20A)
3
PIN 1
IDENTIFIER
4
19
18
8
9
14
13
TOP VIEW
(PINS DOWN)
0.395 (10.02)
0.385 (9.78)
SQ
0.356 (9.04)
0.350 (8.89)
SQ
0.048 (1.21)
0.042 (1.07)
0.048 (1.21)
0.042 (1.07)
0.020
(0.50)
R
0.050
(1.27)
BSC
0.021 (0.53)
0.013 (0.33) 0.330 (8.38)
0.290 (7.37)
0.032 (0.81)
0.026 (0.66)
0.180 (4.57)
0.165 (4.19)
0.040 (1.01)
0.025 (0.64)
0.056 (1.42)
0.042 (1.07)
0.025 (0.63)
0.015 (0.38)
0.110 (2.79)
0.085 (2.16)
PRINTED
IN
U.S.A.
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