Single-Supply, Fixed G = 2, High Speed,

Video Amplifier with Charge Pump

ADA4859-3

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©2008 Analog Devices, Inc. All rights reserved.

FEATURES

Integrated charge pump

Supply range: 3 V to 5.5 V

Output range: −3.3 V to −1.8 V

50 mA maximum output current at −3 V for external use

High speed amplifiers

−3 dB bandwidth: 195 MHz

Slew rate: 740 V/μs

0.1 dB gain flatness: 60 MHz

0.1% settling time: 20 ns

Low power

Total quiescent current: 38 mA

Power-down feature

High input common-mode voltage range

−1.8 V to +3.8 V at +5 V supply

Current feedback architecture

Differential gain error: 0.01%

Differential phase error: 0.02°

Available in 16-lead LFCSP

APPLICATIONS

Professional video

Consumer video

Imaging

Active filters

CONNECTION DIAGRAM

NOTES

1. NC = NO CONNECT.

2. EXPOSED PAD, CONNECT TO GROUND.

ADA4859-3

1

2

C1_a

C1_b

CPO

3

4

11 –IN2

12 +IN2

CHARGE

PUMP

10 OUT2

9

56

7

8

16

15

14

13

PD

Figure 1.

GENERAL DESCRIPTION

The ADA4859-3 (triple) is a single-supply, high speed current

feedback amplifier with an integrated charge pump that eliminates

the need for negative supplies in order to output negative voltages

or output a 0 V level for video applications. The 195 MHz, large

signal −3 dB bandwidth at a fixed gain of 2, as well as the 740 V/μs

slew rate, make this amplifier ideal for high resolution professional

and consumer video applications. The amplifier also has a wide

input common-mode voltage range that extends from 1.8 V

below ground to 1.2 V below the positive rail at 5 V supply.

This triple video amplifier is designed to operate on supply

voltages of 3.3 V to 5 V, using only 38 mA total quiescent

current, including the charge pump. To further reduce the

power consumption, it is equipped with a power-down feature

that lowers the total supply current to as low as 2 mA when the

amplifier is not being used. Even in power-down mode, the

charge pump can be used to power external components. The

maximum output current for external use is 50 mA at −3 V.

The ADA4858-3 is available in a 16-lead LFCSP, and it is designed

to work over the industrial temperature range of −40°C to +105°C.