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APPLICATIONS

THS 4509

CM

From

50

Ω

Source

0.22

µF

49.9

Ω

69.8

Ω

100

Ω

69.8

Ω

100

Ω

348

Ω

2.5 V

−2.5 V

348

Ω

487

Ω

487

Ω

56.3

Ω

1:1

Open

To 50

Ω

Test

Equipment

DESCRIPTION

-1 10

-105

-100

-95

-90

-85

-80

-75

1

10

100

f - Frequency - MHz

G = 10 dB,

THS4509

SLOS454 – JANUARY 2005

WIDEBAND, LOW NOISE, LOW DISTORTION FULLY DIFFERENTIAL AMPLIFIER

To allow for dc coupling to ADCs, its unique output

common-mode control circuit maintains the output

•

Fully Differential Architecture

common-mode voltage within 3 mV offset (typ) from

•

Centered Input Common-mode Range

the set voltage, when set within 0.5 V of mid-supply,

with less than 4 mV differential offset voltage. The

•

Minimum Gain of 2V/V (6 dB)

common-mode set point is set to mid-supply by

•

Bandwidth: 1900 MHz (100 mVpp, G = 10 dB,

internal circuitry, which may be over-driven from an

external source.

•

Slew Rate: 6600 V/µs (2V step, G = 10 dB)

The input and output are optimized for best perform-

•

1% Settling Time: 2 ns (2 V step, G = 10 dB)

ance with their common-mode voltages

set

to

•

mid-supply. Along with high performance at low

power supply voltage, this makes for extremely high

performance single supply 5 V data acquisition sys-

•

tems. The combined performance of the THS4509 in

a gain of 10 dB driving the ADS5500 ADC, sampling

•

at 125 MSPS, is 81 dBc SFDR and 69.1 dBc SNR

G = 10 dB)

with a –1 dBFS signal at 70 MHz.

•

The THS4509 is offered in a Quad 16-pin leadless

G = 10 dB)

QFN package (RGT), and is characterized for oper-

•

Input Voltage Noise: 1.9 nV/

√Hz (f >10 MHz)

ation over the full industrial temperature range from

–40

°C to 85°C.

•

Noise Figure: 17.1 dB (50

Ω System, G = 10

dB)

•

Output Common-Mode Control

•

Power Supply:

– Voltage: 3 V (

±1.5 V) to 5 V (±2.5 V)

– Current: 37.7 mA

•

Power-Down Capability: 0.65 mA

•

5 V Data Acquisition Systems High

Linearity ADC Amplifier

•

Wireless Communication

•

Medical Imaging

•

Test and Measurement

The THS4509 is a wideband, fully differential op amp

designed for 5 V data acquisition systems. It has very

low noise at 1.9 nV/

√Hz, and extremely low harmonic

MHz with 2 Vpp, G = 10 dB, and 1 k

Ω load. Slew rate

is very high at 6600 Vµs and with settling time of 2 ns

to 1% (2 V step) it is ideal for pulsed applications. It is

designed for minimum gain of 6 dB, but is optimized

for gain of 10 dB.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.