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參數(shù)資料
| 型號(hào)： | MCP6548 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Open-Drain Output Sub-Microamp Comparators |
| 中文描述： | 開(kāi)漏輸出子微安比較 |
| 文件頁(yè)數(shù)： | 14/28頁(yè) |
| 文件大?。?/td> | 625K |
| 代理商： | MCP6548 |
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MCP6546/7/8/9
DS21714C-page 14
2003 Microchip Technology Inc.
3.7
Battery Life
In order to maximize battery life in portable
applications, use large resistors and small capacitive
loads. Also, avoid toggling the output more than
necessary and do not use chip select (CS) to conserve
power for short periods of time. Capacitive loads will
draw additional power at start-up.
3.8
PCB Surface Leakage
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
12
. A 5V difference
would cause 5 pA. If current-to-flow, this is greater
than the MCP6546/7/8/9 family’s bias current at 25°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 3-6.
FIGURE 3-6:
for Inverting Circuit.
Example Guard Ring Layout
1.
Inverting Configuration (Figures 3-3 and 3-6):
a.
Connect the guard ring to the non-inverting
input pin (V
IN
+). This biases the guard ring
to the same reference voltage as the
comparator (e.g., V
DD
/2 or ground).
b.
Connect the inverting pin (V
IN
–) to the input
pad without touching the guard ring.
3.9
Typical Applications
3.9.1
PRECISE COMPARATOR
Some applications require higher DC precision. An
easy way to solve this problem is to use an amplifier
(such as the MCP6041) to gain-up the input signal
before it reaches the comparator. Figure 3-7 shows an
example of this approach.
FIGURE 3-7:
Comparator.
Precise Inverting
3.9.2
WINDOWED COMPARATOR
Figure 3-8 shows one approach to designing a
windowed comparator. The wired-OR connection
produces a high output (logic 1) when the input voltage
is between V
RB
and V
RT
(where V
RT
> V
RB
).
FIGURE 3-8:
Windowed comparator.
Guard Ring
V
SS
V
IN
-
V
IN
+
V
REF
V
DD
V
DD
R
1
R
2
V
REF
V
OUT
V
IN
V
PU
R
PU
MCP6546
MCP6041
V
RT
1/2
MCP6547
V
RB
V
IN
V
PU
R
PU
V
OUT
1/2
MCP6547
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| MCP6548-E/MS | 功能描述:校驗(yàn)器 IC Single 1.6V Open Drain Comp RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MCP6548-E/P | 功能描述:校驗(yàn)器 IC Single 1.6V Open Drain Comp RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MCP6548-E/SN | 功能描述:校驗(yàn)器 IC Single 1.6V Open Drain Comp RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MCP6548-I/MS | 功能描述:校驗(yàn)器 IC Sgl 1.6V Open D w/CS RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MCP6548-I/P | 功能描述:校驗(yàn)器 IC Sgl 1.6V Open D w/CS RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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