AD8027| Datasheet

AD8027, AD8028

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Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers AD8027/AD8028
FEATURES
High speed 190 MHz, 3 dB bandwidth (G = +1) 100 V/s slew rate Low distortion 120 dBc @ 1 MHz SFDR 80 dBc @ 5 MHz SFDR Selectable input crossover threshold Low noise 4.3 nV/Hz 1.6 pA/Hz Low offset voltage: 900 V max Low power: 6.5 mA/amplifier supply current Power-down mode No phase reversal: VIN > |VS| + 200 mV Wide supply range: 2.7 V to 12 V Small packaging: SOIC-8, SOT-23-6, MSOP-10
AD8027
SOIC-8 (R) NC 1 IN 2 +IN 3 VS 4
8 7 6 5

CONNECTION DIAGRAMS
AD8027
SOT-23-6 (RT) DISABLE/SELECT +VS VOUT NC +IN 3
4

VOUT 1 VS 2

+VS DISABLE/SELECT

NC = NO CONNECT

AD8028
SOIC-8 (R) VOUTA 1 IN A 2 +IN A 3 VS 4 + +
8 7 6 5

AD8028
MSOP-10 (RM) +VS VOUTB IN B +IN B VOUTA 1 IN A 2 +IN A 3 VS 4 DISABLE/SELECT A 5
03327-B-001

10 +VS

+ +

9 8 7 6

VOUTB IN B +IN B DISABLE/SELECT B

Figure 1. Connection Diagrams (Top View)

APPLICATIONS
Filters ADC drivers Level shifting Buffering Professional video Low voltage instrumentation

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/amplifier typical. The AD8027/AD8028 have a shutdown mode that is controlled via the SELECT pin. The AD8027/AD8028 are available in SOIC-8, MSOP-10, and SOT-23-6 packages. They are rated to work over the industrial temperature range of 40 C to +125 C.
20 G = +1 FREQUENCY = 100kHz RL = 1k

GENERAL DESCRIPTION
The AD8027/AD80281 are high speed amplifiers with rail-torail input and output that operate on low supply voltages and are optimized for high performance and 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 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 SELECT pin. This feature controls the voltage at which the complementary transistor input pairs switch. The AD8027/ AD8028 also have intrinsically low crossover distortion.

60 VS = +3V
SFDR (dB)

VS = +5V VS = 5V

100

120

140 0 1 2 3 4 5 6 7 OUTPUT VOLTAGE (V p-p) 8 9 10
03327-A-063

Figure 2. SFDR vs. Output Amplitude
1

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

Rev. C
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