參數(shù)資料
型號(hào)： AD8651AR-REEL
廠商： ANALOG DEVICES INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： 50 MHz, Precision, Low Distortion, Low Noise CMOS Amplifiers
中文描述： OP-AMP, 1700 uV OFFSET-MAX, 50 MHz BAND WIDTH, PDSO8
封裝： MS-012AA, SOIC-8
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 558K
代理商： AD8651AR-REEL
AD8651/AD8652
APPLICATIONS
THEORY OF OPERATION
The AD8651 amplifier is a voltage feedback, rail-to-rail input
and output precision CMOS amplifier that operates from 2.7 V
to 5.0 V of power supply voltage. This amplifier uses Analog
Devices’ DigiTrim technology to achieve a higher degree of
precision than is available from most CMOS amplifiers.
DigiTrim technology, used in a number of ADI amplifiers, is a
method of trimming the offset voltage of the amplifier after it
has been assembled. The advantage of post-package trimming is
that it corrects any offset voltages caused by the mechanical
stresses of assembly.
Rev. B | Page 14 of 20
The AD8651 is available in standard op amp pinout, making
DigiTrim completely transparent to the user. The input stage of
the amplifier is a true rail-to-rail architecture, allowing the
input common-mode voltage range of the op amp to extend to
both positive and negative supply rails. The open-loop gain of
the AD8651/AD8652 with a load of 1 k is typically 115 dB.
The AD8651 can be used in any precision op amp application.
The amplifier does not exhibit phase reversal for common-
mode voltages within the power supply. With voltage noise of
4.5 nV/√Hz and –105 dB distortion for 10 kHz, 2 V p-p signals,
the AD8651/AD8652 is a great choice for high resolution data
acquisition systems. Its low noise, sub-pA input bias current,
precision offset, and high speed make it a superb preamp
for fast photodiode applications. The speed and output
drive capability of the AD8651 also make it useful in
video applications.
Rail-to-Rail Output Stage
The voltage swing of the output stage is rail-to-rail and is
achieved by using an NMOS and PMOS transistor pair con-
nected in a common source configuration. The maximum
output voltage swing is proportional to the output current, and
larger currents will limit how close the output voltage can get to
the proximity of the output voltage to the supply rail. This is a
characteristic of all rail-to-rail output amplifiers. With 40 mA of
output current, the output voltage can reach within 5 mV of the
positive and negative rails. At light loads of >100 k, the output
swings within ~1 mV of the supplies.
Rail-to-Rail Input Stage
The input common-mode voltage range of the AD8651 extends
to both positive and negative supply voltages. This maximizes
the usable voltage range of the amplifier, an important feature
for single-supply and low voltage applications. This rail-to-rail
input range is achieved by using two input differential pairs, one
NMOS and one PMOS, placed in parallel. The NMOS pair is
active at the upper end of the common-mode voltage range,
and the PMOS pair is active at the lower end of the common-
mode range.
The NMOS and PMOS input stages are separately trimmed
using DigiTrim to minimize the offset voltage in both differen-
tial pairs. Both NMOS and PMOS input differential pairs are
active in a 500 mV transition region when the input common-
mode voltage is approximately 1.5 V below the positive supply
voltage. A special design technique improves the input offset
voltage in the transition region that traditionally exhibits a
slight V
OS
variation. As a result, the common-mode rejection
ratio is improved within this transition band. Compared to the
Burr Brown OPA350 amplifier, shown in Figure 53 (A), the
AD8651, shown in Figure 53 (B), exhibits much lower offset
voltage shift across the entire input common-mode range,
including the transition region.
COMMON-MODE VOLTAGE (V)
V
O
μ
V
0
–600
–200
200
600
400
0
–400
2
1
4
3
5
6
0
COMMON-MODE VOLTAGE (V)
V
O
μ
V
0
–600
–200
200
600
400
0
–400
2
1
4
3
5
6
0
(A) OPA350 VOS vs. VCM (B) AD8651 VOS vs. VCM
Figure 53. Input Offset Distribution over Common-Mode Voltage
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD8651AR-REEL7 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 5.5V 8-Pin SOIC N T/R
AD8651ARZ 功能描述:IC OPAMP VF CMOS 50MHZ LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 產(chǎn)品培訓(xùn)模塊:Differential Circuit Design Techniques for Communication Applications 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:RF/IF 差分 電路數(shù):1 輸出類型:差分 轉(zhuǎn)換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤，CSP 供應(yīng)商設(shè)備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT
AD8651ARZ 制造商:Analog Devices 功能描述:OP AMP 50MHZ RRI/O 8651 SOIC8
AD8651ARZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:50 MHz, Precision, Low Distortion, Low Noise CMOS Amplifiers
AD8651ARZ-REEL 功能描述:IC OPAMP VF CMOS 50MHZ LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR)
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