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| 型号： | ADM1034ARQZ-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封装： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件页数： | 11/40页 |
| 文件大小： | 1318K |
| 代理商： | ADM1034ARQZ-REEL |
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ADM1034
Rev. 0 | Page 19 of 40
LAYOUT CONSIDERATIONS
Digital boards can be electrically noisy environments. Try
to protect the analog inputs from noise, particularly when
measuring the very small voltages from a remote diode sensor.
Take the following precautions:
Place the ADM1034 as close as possible to the remote
sensing diode. A distance of 4 inches to 8 inches is
adequate, provided that the worst noise sources such
as clock generators, data/address buses, and CRTs are
avoided.
Route the D+ and D tracks close together, in parallel, with
grounded guard tracks on each side. Provide a ground
plane under the tracks if possible.
Use wide tracks to minimize inductance and reduce noise
pickup. At least 5 mil track width and spacing are
recommended.
5MIL
GND
D+
GND
D–
04918-0-028
Figure 29. Arrangement of Signal Tracks
Try to minimize the number of copper/solder joints,
because they can cause thermocouple effects. Where
copper/solder joints are used, make sure that they are in
both the D+ and D paths and at the same temperature.
Thermocouple effects are not a major problem because
1°C corresponds to approximately 200 V, and thermocou-
ple voltages are approximately 3 V/°C of temperature
difference. Unless there are two thermocouples with a big
temperature differential between them, the voltages should
be much less than 200 V.
Place a 0.1 F bypass capacitor close to the ADM1034.
If the distance to the remote sensor is more than 8 inches,
twisted pair cable is recommended. This works up to about
6 feet to 12 feet.
For very long distances (up to 100 feet), use shielded
twisted pair such as Belden #8451 microphone cable.
Connect the twisted pair to D+ and D and the shield to
GND, close to the ADM1034. Leave the remote end of the
shield unconnected to avoid ground loops.
Because the measurement technique uses switched current
sources, excessive cable and/or filter capacitance can affect the
measurement. When using long cables, the filter capacitor C1
may be reduced or removed. In any case, the total shunt
capacitance should never exceed 1000 pF.
Noise Filtering
For temperature sensors operating in noisy environments,
common practice is to place a capacitor across the D+ and D
pins to help combat the effects of noise. However, large
capacitances affect the accuracy of the temperature measurement,
leading to a recommended maximum capacitor value of 1000 pF.
While this capacitor reduces the noise, it does not eliminate it,
making it difficult to use the sensor in a very noisy environment.
The ADM1034 has a major advantage over other devices when
it comes to eliminating the effects of noise on the external
sensor. The series resistance cancellation feature allows a filter
to be constructed between the external temperature sensor and
the part. The effect of any filter resistance seen in series with the
remote sensor is automatically cancelled from the temperature.
The construction of a filter allows the ADM1034 and the
remote temperature sensor to operate in noisy environments.
Figure 30 shows a low-pass R-C-R filter with the following
values: R = 100 and C = 1 nF. This filtering reduces both
common-mode noise and differential noise.
04110-0-009
D+
1nF
100
REMOTE
TEMPERATURE
SENSOR
D–
100
Figure 30. Filter between Remote Sensor and ADM1034
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