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| 型号： | AD597ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/8页 |
| 文件大小： | 772K |
| 描述： | IC THERMOCOUPLE COND 8-SOIC |
| 标准包装： | 98 |
| 功能： | 热电偶调节器 |
| 传感器类型： | 外部 |
| 感应温度： | -200°C ~ 1250°C |
| 精确度： | ±4°C（最小值） |
| 拓扑： | 冰点补偿 |
| 输出类型： | 电压 |
| 输出警报： | 是 |
| 输出风扇： | 无 |
| 电源电压： | 5 V ~ 30 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
| 产品目录页面： | 797 (CN2011-ZH PDF) |
AD596/AD597
REV. B
5
SETPOINT CONTROL MODE
The AD596/AD597 can be connected as a setpoint controller as
shown in Figure 2. The thermocouple voltage is cold junction
compensated, amplified, and compared to an external setpoint
voltage. The relationship between setpoint voltage and tempera-
ture is given in Table I. If the temperature to be controlled is
within the operating range (55癈 to +125癈) of the device, it
can monitor its own temperature by shorting the inputs to
ground. The setpoint voltage with the thermocouple inputs
grounded is given by the expressions:
AD596 Setpoint Voltage = 癈 ?9.6 mV/癈 + 42mV
AD597 Setpoint Voltage = 癈 ?10.1mV/癈 9.1mV
The input impedance of the setpoint pin of the AD596/AD597
is approximately 50k&. The temperature coefficient of this
resistance is ?5 ppm/癈. Therefore, the 100ppm/癈 5 k& pot
shown in Figure 2 will only introduce an additional ?癈 degra-
dation of temperature stability over the +25癈 to +100癈 ambi-
ent temperature range.
AD596/
AD597*
CONSTANTAN
(ALUMEL)
IRON
(CHROMEL)
0.01F
+V
R
HYSTERESIS
(OPTIONAL)
TEMPERATURE
CONTROLLED
REGION
HEATER
DRIVER
TEMPERATURE
COMPARATOR
OUTPUT
SET-
POINT
VOLTAGE
V
REF
5k
100ppm/C
SET-
POINT
VOLTAGE
*H PACKAGE PINOUT SHOWN
Figure 2. Setpoint Control Mode
Switching hysteresis is often used in setpoint systems of this type
to provide noise immunity and increase system reliability. By
reducing the frequency of on-off cycling, mechanical component
wear is reduced leading to enhanced system reliability. This can
easily be implemented with a single external resistor between
Pins 7 and 3 of the AD596/AD597. Each 200 nA of current
injected into Pin 3 when the output switches will cause about
1癈 of hysteresis; that is:
R
HYST
(&)=
V
OUT
200nA
?/DIV>
1
?SPAN class="pst AD597AHZ_2319720_9">C
HYST
In the setpoint configuration, the AD596/AD597 output is
saturated at all times, so the alarm transistor will be ON regard-
less of whether there is an open circuit or not. However, ALM
must be tied to a voltage below (+V
S
4V) for proper operation
of the rest of the circuit.
STAND-ALONE TEMPERATURE TRANSDUCER
The AD596/AD597 may be configured as a stand-alone Celsius
thermometer as shown in Figure 3.
0.01F
V
S
V
OUT
9.6mV/C
+V
S
0.01F
+
G
A
+
ICE
POINT
COMP
+
AD596/
AD597*
+
G
*H PACKAGE PINOUT SHOWN
Figure 3. Stand-Alone Temperature Transducer
Temperature Proportional Output Connection
Simply omit the thermocouple and connect the inputs (Pins 1
and 2) to common. The output will now reflect the compensa-
tion voltage and hence will indicate the AD596/AD597 tem-
perature. In this three terminal, voltage output, temperature
sensing mode, the AD596/AD597 will operate over the full
extended 55癈 to +125癈 temperature range. The output
scaling will be 9.6 mV per 癈 with the AD596 and 10.1 mV per
癈 with the AD597. Additionally there will be a 42mV offset
with the AD596 causing it to read slightly high when used in
this mode.
THERMOCOUPLE CONNECTIONS
The connection of the thermocouple wire and the normal wire
or printed circuit board traces going to the AD596/AD597
forms an effective reference junction as shown in Figure 4. This
junction must be kept at the same temperature as the AD596/
AD597 for the internal cold junction compensation to work
properly. Unless the AD596/AD597 is in a thermally stable
enclosure, the thermocouple leads should be brought in directly
to Pins 1 and 2.
REFERENCE JUNCTION
CONSTANTAN
(ALUMEL)
IRON
(CHROMEL)
NOTE:
A BIAS RETURN PATH
FROM PINS 1 AND 2
OF LESS THAN 1k
IMPEDANCE MUST BE
PROVIDED.
0.01F
AD596/
AD597*
LIMITING RESISTOR
TO
LED
0.01F
+V
S
V
OUT
*H PACKAGE PINOUT SHOWN
Figure 4. PCB Connections
To ensure secure bonding, the thermocouple wire should be
cleaned to remove oxidization prior to soldering. Noncorrosive
resin flux is effective with iron, constantan, chromel, and
alumel, and the following solders: 95% tin5% silver, or 90%
tin10% lead.
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