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Wideband, Fully Differential
1900MHz Operational Amplifier
Burr-Brown / Texas Instruments.
Fully Differential Architecture
Centered Input Common-mode Range
Output Common-Mode Control
Minimum Gain of 2V/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/rtHz (f >10 MHz)
Power Supply Voltage: 3 V to 5 V
Power Supply Current: 37.7 mA
Power-Down Current: 0.65 mA
APPLICATIONS
5 V Data Acquisition Systems High Linearity ADC Amplifier
Wireless Communication
Medical Imaging
Test and Measurement
Description
The THS4509 is a wideband, fully differential op amp designed for 5-V data acquisition systems. It has a low noise at 1.9 nV/rtHz, and low harmonic distortion of -75 dBc HD2 and -80 dBc HD3 at 100 MHz with 2 Vpp, G = 10 dB, and 1 kohm load. Slew rate is 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.
To allow for dc coupling to ADCs, its unique output common-mode control circuit maintains the output common-mode voltage within 3 mV offset (typ) from the set voltage, when set within 0.5 V of mid-supply, with less than 4 mV differential offset voltage. The common-mode set point is set to mid-supply by internal circuitry, which may be over-driven from an external source.
The input and output are optimized for best performance with their common-mode voltages set to mid-supply. Along with high performance at low power supply voltage, this makes 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.
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