THS4508

` Fully Differential Architecture
` Centered Input Common-mode Range
` Minimum Gain of 2V/V (6 dB)
` Bandwidth: 1900 MHz
` Slew Rate: 6600 V/µs 
` 0.1% Settling Time: 2 ns
` HD<sub>2</sub>: 75 dBc at 100 MHz for gain of 10 dB.
` HD₃: 80 dBc at 100 MHz
` OIP<sub>2</sub>: 73 dBm at 70 MHz
` OIP₃: 37 dBm at 70 MHz 
` Input Voltage Noise: 1.9 nV/ (f >10 MHz)
` Noise Figure: 17.1 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. THS4509 has very low noise at 1.9 nV/, and extremely low harmonic distortion of 75 dBc HD₂ and 80 dBc HD₃ at 100 MHz with 2 Vpp, G = 10 dB, and 1 k 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.

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 of THS4509 is set to mid-supply by internal circuitry, which may be over-driven from an external source.

The input and output of THS4509 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 extremely 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 16-pin leadless QFN package (RGT), and is characterized for operation over the full industrial temperature range from 40°C to 85°C.