Data Sheet

AD8027/AD8028

Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers

Rev. E

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FEATURES

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High speed

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190 MHz, −3 dB bandwidth (G = +1)

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100 V/µs slew rate

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Low distortion

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120 dBc at 1 MHz SFDR

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80 dBc at 5 MHz SFDR

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Selectable input crossover threshold

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Low noise

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4.3 nV/√Hz

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1.6 pA/√Hz

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Low offset voltage: 900 µV maximum

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Low power: 6.5 mA per amplifier supply current

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Power-down mode

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No phase reversal: VIN > |VS| + 200 mV

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Wide supply range: 2.7 V to 12 V

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Small packaging: 8-lead SOIC, 6-lead SOT-23, 10-lead MSOP

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Qualified for automotive applications (AD8028WARMZ-R7 only)

APPLICATIONS

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Filters

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ADC drivers

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Level shifting

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Buffering

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Professional video

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Low voltage instrumentation

PIN CONNECTION DIAGRAM

Figure 1. 8-Lead SOIC, AD8027

See the Pin Configurations and Function Descriptions section for

additional pin configurations and information about the pin func-

tions.

GENERAL DESCRIPTION

The AD8027/AD80281 are high speed amplifiers with rail-to-rail

input and output that operate on low supply voltages and are

optimized for high performance and a wide dynamic signal range.

The AD8027/AD8028 have low noise (4.3 nV/√Hz, 1.6 pA/√Hz) and

low distortion (120 dBc at 1 MHz). In applications that use a fraction

of or use the entire input dynamic range and require low distortion,

the AD8027/AD8028 are ideal choices.

Many rail-to-rail input amplifiers have an input stage that switches

from one differential pair to another as the input signal crosses a

threshold voltage, which causes distortion. The AD8027/AD8028

have a unique feature that allows the user to select the input

crossover threshold voltage through the DISABLE/SELECT pin

(DISABLE/SELECT x in the 10-lead MSOP, hereafter referred to

as DISABLE/SELECT throughout this data sheet). This feature con-

trols the voltage at which the complementary transistor input pairs

switch. The AD8027/AD8028 also have intrinsically low crossover

distortion.

With their wide supply voltage range (2.7 V to 12 V) and wide

bandwidth (190 MHz), the AD8027/AD8028 amplifiers are designed

to work in a variety of applications where speed and performance

are needed on low supply voltages. The high performance of the

AD8027/AD8028 is achieved with a quiescent current of only 6.5

mA (typical) per amplifier. The AD8027/AD8028 have a shutdown

mode that is controlled via the DISABLE/SELECT pin.

The AD8027/AD8028 are available in 8-lead SOIC, 6-lead SOT-23,

and 10-lead MSOP packages. The AD8028WARMZ-R7 is an auto-

motive grade version, qualified for automotive applications. See the

Automotive Products section for more details. The AD8027/AD8028

family is designed to work over the extended temperature range of

−40°C to +125°C.

Figure 2. SFDR vs. Output Voltage

1 Protected by U.S. patent numbers 6,486,737B1; 6,518,842B1.