270 MHz, 400 μA

Current Feedback Amplifier

Data Sheet

AD8005

Rev. B

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FEATURES

Ultralow power

400 μA power supply current (4 mW on ±5 VS)

Specified for single supply operation

High speed

270 MHz, −3 dB bandwidth (G = +1)

170 MHz, −3 dB bandwidth (G = +2)

280 V/μs slew rate (G = +2)

28 ns settling time to 0.1%, 2 V step (G = +2)

Low distortion/noise

−63 dBc at 1 MHz, VO = 2 V p-p

−50 dBc at 10 MHz, VO = 2 V p-p

4.0 nV/√Hz input voltage noise at 10 MHz

Good video specifications (RL = 1 kΩ, G = +2)

Gain flatness 0.1 dB to 30 MHz

0.11% differential gain error

0.4° differential phase error

APPLICATIONS

Signal conditioning

A/D buffer

Power sensitive, high speed systems

Battery powered equipment

Loop/remote power systems

Communication or video test systems

Portable medical instruments

GENERAL DESCRIPTION

The AD8005 is an ultralow power, high speed amplifier with a

wide signal bandwidth of 170 MHz and slew rate of 280 V/μs.

This performance is achieved while consuming only 400 μA of

quiescent supply current. These features increase the operating

time of high speed battery powered systems without reducing

dynamic performance.

The current feedback design results in gain flatness of 0.1 dB to

30 MHz while offering differential gain and phase errors of 0.11%

and 0.4°. Harmonic distortion is low over a wide bandwidth with

THDs of −63 dBc at 1 MHz and −50 dBc at 10 MHz. Ideal features

for a signal conditioning amplifier or buffer to a high speed A-to-D

converter in portable video, medical or communication systems.

The AD8005 is characterized for +5 V and ±5 V supplies and

operates over the industrial temperature range of −40°C to

+85°C. The amplifier is supplied in 8-lead PDIP, 8-lead SOIC_N,

and 5-lead SOT-23 packages.

FUNCTIONAL BLOCK DIAGRAMS

Figure 1. 8-Lead PDIP and SOIC_N

Figure 2. 5-Lead SOT-23

Figure 3. Frequency Response; G = ±2, VS = +5 V or ±5 V

Figure 4. Distortion vs. Frequency; VS = ±5 V

AD8005

NC 1

–IN 2

+IN 3

–VS 4

NC

8

+VS

7

OUT

6

NC

5

NC = NO CONNECT

TOP VIEW

(Not to Scale)

AD8005

TOP VIEW

(Not to Scale)

OUT 1

+IN 3

–VS 2

+VS

5

–IN

4

0.1

1

10

100

500

FREQUENCY (MHz)

0

3

2

1

–1

–2

–3

–4

–5

–6

VS = +5V

VS = ±5V

G = +2

VOUT = 200mV p-p

RL = 1kΩ

110

20

FREQUENCY (MHz)

G = +2

VOUT = 2V p-p

RL = 1kΩ

–40

–60

–80

–100

–50

–70

–90

THIRD HARMONIC

SECOND HARMONIC