High Speed, High Voltage,

1 A Output Drive Amplifier

Data Sheet

ADA4870

Rev. 0

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FEATURES

Ideal for driving high capacitive or low resistive loads

Wide supply range: 10 V to 40 V

High output current drive: 1 A

Wide output voltage swing: 37 V swing with 40 V supply

High slew rate: 2500 V/µs

High bandwidth: 52 MHz large signal, 70 MHz small signal

Low noise: 2.1 nV/√Hz

Quiescent current: 32.5 mA

Power down: 0.75 mA

Short-circuit protection and flag

Current limit: 1.2 A

Thermal protection

APPLICATIONS

Envelope tracking

Power FET driver

Ultrasound

Piezo drivers

PIN diode drivers

Waveform generation

Automated test equipment (ATE)

CCD panel drivers

Composite amplifiers

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The ADA4870 is a unity gain stable, high speed current

feedback amplifier capable of delivering 1 A of output current

and 2500 V/μs slew rate from a 40 V supply. Manufactured

using the Analog Devices, Inc., proprietary high voltage extra

fast complementary bipolar (XFCB) process, the innovative

architecture of the ADA4870 enables high output power, high

speed signal processing solutions in applications that require

driving a low impedance load.

The ADA4870 is ideal for driving high voltage power FETs,

piezo transducers, PIN diodes, CCD panels, and a variety of

other demanding applications that require high speed from

high supply voltage at high output current.

The ADA4870 is available in a power SOIC package (PSOP_3),

featuring an exposed thermal slug that provides high thermal

conductivity, enabling efficient heat transfer for improved perfor-

mance and reliability in demanding applications. The ADA4870

operates over the industrial temperature range (−40°C to +85°C).

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

TFL

SD

ON

INN

INP

NC

OUT

OUT

OUT

OUT

NC

OUT

ADA4870

–20

–15

–10

–5

0

5

10

15

20

–4,000

–3,000

–2,000

–1,000

0

1,000

2,000

3,000

4,000

TIME (45ns/DIV)

SLEW RATE