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參數(shù)資料
| 型號： | AD537 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Voltage-to-Frequency Converter IC(壓頻轉換器芯片) |
| 中文描述： | 電壓頻率轉換器集成電路（壓頻轉換器芯片） |
| 文件頁數(shù)： | 8/8頁 |
| 文件大小： | 179K |
| 代理商： | AD537 |
AD537
REV. C
–
8
–
P
C
–
0
–
4
THERMOCOUPLE INPUT
The output of a Chromel-Constantan (Type E) thermocouple,
using a reference junction at 0
°
C, varies from 0 mV to 53.14 mV
over the temperature range 0
°
C to +700
°
C with a slope of
80.678
μ
V/degree over most of its range and some nonlinearity
over the range 0
°
C to +200
°
C. For this example, we assume
that it is desired to indicate temperature in Degrees Celsius
using a counter/display with a 100 ms gate width. Thus, the V-F
converter must deliver an output of 7 kHz for an input of
53.14 mV. If very precise operation down to 0
°
C is imperative,
some sort of linearizing is necessary (see, for example,
Analog
Devices’ Nonlinear Circuits Handbook
, pp. 92
–
97) but in many
cases operation is only needed over part of the range.
The circuit shown in Figure 14 provides good accuracy from
+300
°
C to +700
°
C. The extrapolation of the temperature volt-
age curve back to 0
°
C shows that an offset of
–
3.34 mV is
required to fit the curve most exactly. This small amount of
voltage can be introduced without an additional calibration step
using the +1.00 V output of the AD537. To adjust the scale, the
thermocouple should be raised to a known reference tempera-
ture near 500
°
C and the frequency adjusted to value using R1.
The error should be within
±
0.2% over the range 400
°
C to
700
°
C.
1
2
14
13
5
6
7
10
9
8
3
4
12
11
AD537
+5V
V
LOGIC
10Hz/
°
C
0.005μF
47k
I
OFFSET
≈
120
R1 SCALE
50
T
MEAS
T
REF
(0
C)
0 TO 53mV
BUF
DRIVER
CURR-
TO-FREQ
CONV
PRECISION
VOLTAGE
REFERENCE
V
T
V
R
360μA
F
S
Figure 14. Thermocouple Interface with First-Order
Linearization
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
14-Lead Side-Brazed Ceramic DIP (TO–116)
(D–14)
PIN 1
0.310 (7.87)
0.220 (5.59)
0.098 (2.49) MAX
0.005 (0.13) MIN
8
7
14
1
0.200
(5.08)
MAX
0.200 (5.08)
0.125 (3.18)
0.023 (0.58)
0.014 (0.36)
0.070 (1.78)
0.030 (0.76)
0.100
(2.54)
BSC
0.060 (1.52)
0.015 (0.38)
0.150
(3.81)
MIN
SEATING
PLANE
0.785 (19.94) MAX
0.320 (8.13)
0.290 (7.37)
0.015 (0.38)
0.008 (0.20)
10-Lead Metal Can (TO-100)
(H-10A)
°
36
0.034 (0.86)
0.028 (0.71)
0.045 (1.14)
0.029 (0.74)
0.115
(2.92)
BSC
0.230
(5.84)
BSC
6
8
5
7
1
4
2
3
9
10
REFERENCE PLANE
0.562 (14.30)
0.500 (12.70)
BASE & SEATING PLANE
0.355 (9.02)
0.305 (7.75)
0.370 (9.40)
0.335 (8.51)
0.040 (1.01)
0.010 (0.25)
0.050
(1.27)
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)
0.044 (1.12)
0.032 (0.81)
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