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參數(shù)資料
| 型號(hào)： | 935268119118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | 3.90 MM, 0.635 MM PITCH, PLASTIC, SOT-519-1, SSOP-16 |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大小： | 128K |
| 代理商： | 935268119118 |
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Philips Semiconductors
Product data
NE1617A
Temperature monitor for microprocessor systems
2001 Dec 14
14
PC BOARD LAYOUT CONSIDERATION
Because the NE1617A is used to measure a very small voltage from
the remote sensor, care must be taken to minimize noise induced at
the sensor inputs, especially in the computer motherboard noisy
environment. These precautions should be considered:
– Place the NE1617A as close as possible to the remote sensor. It
can be from 4 to 8 inches, as long as the worst noise sources
such as clock generator, data and address buses, CRTs are
avoided.
– Route the D+ and D– lines in parallel and close together with
ground guards enclosed.
– Leakage currents due to PC board contamination must be
considered. Error can be introduced by the leakage current as
shown on the characteristics curve (Temperature Error vs. PC
Board Resistance, Figure 5).
– Use wide tracks to reduce inductance and noise pickup that may
be introduced by narrow ones. The width of 10 mil and space of
10 mil are recommended.
GND
D+
D–
GND
SL01218
– Place a bypass capacitor of 0.1
F close to the VDD pin and an
input filter capacitor of 2200 pF close to the D+ and D– pins.
– A shielded twisted pair is recommended for a long distance
remote sensor. Connect the shield of the cable at the device side
to the NE1617A GND pin and leave the shield at the remote end
unconnected to avoid ground loop. Also notice that the series
resistance of the cable may introduce measurement error; 1
can introduce about 0.5
°C.
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