參數(shù)資料
型號(hào)： AD8028ARM-REEL
廠商： ANALOG DEVICES INC
元件分類： 音頻／視頻放大
英文描述： Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
中文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO10
封裝： MO-187BA, MSOP-10
文件頁(yè)數(shù)： 16/24頁(yè)
文件大?。?/td> 478K
代理商： AD8028ARM-REEL
AD8027/AD8028
THEORY OF OPERATION
The AD8027/AD8028 is a rail-to-rail input and output amplifier
designed in Analog Devices XFCB process. The XFCB process
enables the AD8027/AD8028 to run on 2.7 V to 12 V supplies
with 190 MHz of bandwidth and over 100 V/μs of slew rate. The
AD8027/AD8028 has 4.3 nV/√Hz of wideband noise with
17 nV/√Hz noise at 10 Hz. This noise performance, with an
offset and drift performance of less than 900 μV maximum and
1.5 μV/°C typical, respectively, makes the AD8027/AD8028
ideal for high speed precision applications. Additionally, the
input stage operates 200 mV beyond the supply rails and shows
no phase reversal. The amplifier features overvoltage protection
on the input stage. Once the inputs exceed the supply rails by
0.7 V, ESD protection diodes will turn on, drawing excessive
current through the differential input pins. A series input resis-
tor should be included to limit the input current to less than
10 mA.
Rev. B | Page 16 of 24
Input Stage
The rail-to-rail input performance is achieved by operating
complementary input pairs. Which pair is on is determined by
the common-mode level of the differential input signal. Look-
ing at the schematic in Figure 55, a tail current (I
TAIL
) is gener-
ated that sources the PNP differential input structure consisting
of Q1 and Q2. A reference voltage is generated internally that is
connected to the base of Q5. This voltage is continually com-
pared against the common-mode input voltage. When the
common-mode level exceeds the internal reference voltage, Q5
diverts the tail current (I
TAIL
) from the PNP input pair to a cur-
rent mirror that sources the NPN input pair consisting of Q3
and Q4. The NPN input pair can now operate 200 mV above
the positive rail. Both input pairs are protected from differential
input signals above 1.4 V by four diodes across the input (see
Figure 55). In the event of differential input signals that exceed
1.4 V, the diodes will conduct and excessive current will flow
through them. A series input resistor should be included to limit
the input current to 10 mA.
Crossover Selection
A new feature available on the AD8027/AD8028, which is called
Crossover Selection, allows the user to choose the crossover
point between the PNP/NPN differential pairs. Although the
crossover region is small, operating in this region should be
avoided since it can introduce offset and distortion to the out-
put signal. To help avoid operating in the crossover region, the
AD8027/AD8028 allows the user to select from two preset
crossover locations (i.e., voltage levels) using the SELECT pin.
Looking at the schematic in Figure 55, the crossover region is
about 200 mV and is defined by the voltage level at the base of
Q5. Internally, two separate voltage sources are created approxi-
mately 1.2 V from either rail. One or the other is connected to
Q5 based on the voltage applied to the SELECT pin. This allows
for either dominant PNP pair operation, when the SELECT pin
is left open, or dominant NPN pair operation, when the
SELECT pin is pulled high. This pin also provides the tradi-
tional power-down function when it is pulled low. This allows
the designer to achieve the best precision and ac performance
for high-side and low-side signal applications. See Figure 50
through Figure 53 for SELECT pin characteristics.
VCC
1.2V
+
–
VEE
I
TAIL
1.2V
+
–
LOGIC
VSEL
VP
Q5
Q3
Q1
Q2
Q4
VN
VOUTP
VOUTN
I
CMFB
VCC
VEE
I
CMFB
03327-A-054
Figure 55. Simplified Input Stage
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD8028ARM-REEL7 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R I/O ±6V/12V 10-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:HIGH PERFORMANCE RRIO - Tape and Reel
AD8028ARMZ 功能描述:IC OPAMP R-R DUAL LDIST 10MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR
AD8028ARMZ-REEL 功能描述:IC OPAMP R-R DUAL LDIST 10MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5
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AD8028AR-REEL 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
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