1 Features

1• Fully-Differential Architecture

• Centered Input Common-Mode Range

• Output Common-Mode Control

• Minimum Gain of 2 V/V (6 dB)

• Bandwidth: 1900 MHz

• Slew Rate: 6600 V/μs

• 1% Settling Time: 2 ns

• HD2: –75 dBc at 100 MHz

• HD3: –80 dBc at 100 MHz

• OIP3: 37 dBm at 70 MHz

• Input Voltage Noise: 1.9 nV/√Hz (f > 10 MHz)

• Power-Supply Voltage: 3 V to 5 V

• Power-Supply Current: 37.7 mA

• Power-Down Current: 0.65 mA

2 Applications

. 5-V Data Acquisition Systems High

Linearity ADC Amplifiers

. Wireless Communication

. Medical Imaging

. Test and Measurement

3 Description

The THS4509 device is a wideband, fully-differential

op amp designed for 5-V data acquisition systems. It

has a low noise at 1.9 nV/√Hz, and low harmonic

distortion of .75 dBc HD2 and .80 dBc HD3 at 100

MHz with 2 VPP, G = 10 dB, and 1-kΩ load. Slew rate

is high at 6600 V/μs, and with settling time of 2 ns to

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

designed for a minimum gain of 6 dB, but is

optimized for gains of 10 dB.

To allow for DC coupling to analog-to-digital

converters (ADCs), its unique output common-mode

control circuit maintains the output common-mode

voltage within 3-mV offset (typical) from the set

voltage, when set within 0.5-V of midsupply, with less

than 4-mV differential offset voltage. The commonmode

set point is set to midsupply by internal

circuitry, which may be overdriven from an external

source.

The input and output are optimized for best

performance with the common-mode voltages set to

midsupply. Along with high performance at low

power-supply voltage, this design makes it ideal for

high-performance, single-supply 5-V data acquisition

systems. 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 with a .1 dBFS signal at 70 MHz.

The THS4509 is offered in a quad, leadless VQFN-16

package (RGT), and is characterized for operation

over the full industrial temperature range from .40°C

to +85°C.