MCP6541RT-E/OT Datasheet

IC型号：
MCP6541RT-E/OT
PDF描述：
COMP, 1.6V, SINGLE, P-P, SOT23-5; Comparator Type:Sub-Microa...
文件大小：
1139.80KB
PDF页数：
32页
芯片厂家：
Microchip

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MCP6541/1R/1U/2/3/4

4.8

PCB Surface Leakage

4.9

Unused Comparators

In applications where low input bias current is critical,

PCB (Printed Circuit Board) surface leakage effects

need to be considered. Surface leakage is caused by

humidity, dust or other contamination on the board.

Under low humidity conditions, a typical resistance

between nearby traces is 10

惟.

A 5V difference would

cause 5 pA of current to flow. This is greater than the

MCP6541/1R/1U/2/3/4 family鈥檚 bias current at 25掳C

(1 pA, typ.).

The easiest way to reduce surface leakage is to use a

guard ring around sensitive pins (or traces). The guard

ring is biased at the same voltage as the sensitive pin.

An example of this type of layout is shown in

Figure 4-9.

An unused amplifier in a quad package (MCP6544)

should be configured as shown in

Figure 4-10.

This

circuit prevents the output from toggling and causing

crosstalk. It uses the minimum number of components

and draws minimal current (see

Figure 2-15

and

Figure 2-18).

录 MCP6544

鈥?/div>

FIGURE 4-10:

Guard Ring

Unused Comparators.

FIGURE 4-9:

Example Guard Ring Layout

for Inverting Circuit.

Inverting Configuration (Figures 4-6 and 4-9):

a. Connect the guard ring to the non-inverting

input pin (V

+). This biases the guard ring

to the same reference voltage as the

comparator (e.g., V

/2 or ground).

b. Connect the inverting pin (V

鈥? to the input

pad without touching the guard ring.

Non-inverting Configuration (Figure

4-4):

a. Connect the non-inverting pin (V

+) to the

input pad without touching the guard ring.

b. Connect the guard ring to the inverting input

pin (V

鈥?.

漏

2006 Microchip Technology Inc.

DS21696E-page 17

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MCP6541RT-E/OT 产品属性

制造商
Microchip
产品种类
校验器 IC
通道数量
1 Channel
产品
Analog Comparators
输出类型
Push-Pull
补偿电压（最大值）
7 mV
最大工作温度
+ 125 C
安装风格
SMD/SMT
封装 / 箱体
SOT-23
封装
Reel
最小工作温度
- 40 C
工厂包装数量
3000
Supply Voltage - Max
5.5 V
Supply Voltage - Min
1.6 V

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