參數(shù)資料
型號(hào)： MCP6V26-E/MS
廠商： Microchip Technology
文件頁(yè)數(shù)： 14/50頁(yè)
文件大小： 0K
描述： IC OPAMP AUTO-ZERO SGL 8MSOP
標(biāo)準(zhǔn)包裝： 100
放大器類型： 自動(dòng)調(diào)零
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 1 V/µs
增益帶寬積： 2MHz
電流 - 輸入偏壓： 7pA
電壓 - 輸入偏移： 2µV
電流 - 電源： 620µA
電流 - 輸出 / 通道： 22mA
電壓 - 電源，單路/雙路(±)： 2.3 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 8-MSOP
包裝： 管件
2011 Microchip Technology Inc.
DS25007B-page 21
MCP6V26/7/8
4.0
APPLICATIONS
The MCP6V26/7/8 family of auto-zeroed op amps are
manufactured using Microchip’s state-of-the-art CMOS
process. This family is designed for low cost, low power
and high precision applications. Its low supply voltage,
low quiescent current and wide bandwidth make the
MCP6V26/7/8 devices ideal for battery-powered appli-
cations.
4.1
Overview of Auto-Zeroing
Operation
Figure 4-1 shows a simplified diagram of the
MCP6V26/7/8 auto-zeroed op amps. This will be used
to explain how the DC voltage errors are reduced in this
architecture.
FIGURE 4-1:
Simplified Auto-Zeroed Op Amp Functional Diagram.
4.1.1
BUILDING BLOCKS
The Null Amplifier and Main Amplifier are designed for
high gain and accuracy using a differential topology.
They have a main input pair (+ and - pins at their top
left) used for the signal. They have an auxiliary input
pair (+ and - pins at their bottom left) used for correcting
the offset voltages. Both input pairs are added together
internally. The capacitors at the auxiliary inputs (CFW
and CH) hold the corrected values during normal
operation.
The Output Buffer is designed to drive external loads at
the VOUT pin. It also produces a single-ended output
voltage (VREF is an internal reference voltage).
All of these switches are make-before-break in order to
minimize glitch-induced errors. They are driven by two
clock phases (
φ1 and φ2) that select between normal
mode and auto-zeroing mode.
The clock is derived from an internal R-C oscillator
running at a rate of fOSC1 = 850 kHz. The oscillator’s
output is divided down to the desired rate.
The internal POR ensures the part starts up in a known
good state. It also provides protection against power
supply brown-out events.
The Digital Control circuitry takes care of all of the
housekeeping details of the switching operation. It also
takes care of POR events.
VIN+
VIN–
Main
Output
VOUT
VREF
Amp.
Buffer
NC
Null
Amp.
Null
Input
φ1
Switches
Null
Correct
φ2
Switches
Null
Output
Switches
CH
CFW
POR
Digital
Control
Oscillator
φ1
φ2
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MCP6V26T-E/MS 功能描述:運(yùn)算放大器 - 運(yùn)放 Single, Auto-Zero Op Amp, E Temp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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MCP6V27-E/MD 功能描述:運(yùn)算放大器 - 運(yùn)放 620 uA, 2 MHz Auto-Zeroed Op Amps RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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