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> THS4508 wideband 2GHZ differential opamp lo noise (X4
THS4508 wideband 2GHZ differential opamp lo noise (X4
Burr-Brown / Texas Instruments.
Fully Differential Architecture
Common-Mode Input Range Includes the Negative Rail
* Minimum Gain of 2 V/V (6 dB)
* Input Voltage Noise: 2.3 nV/sqrtHz (f > 10 MHz)
* Noise Figure: 19.2 dB (G = 10 dB)
* Output Common-Mode Control
* 5-V Power Supply Current: 39.2 mA
* Power-Down Capability: 0.65 mA
* 5-V Data-Acquisition Systems
* High Linearity ADC Amplifier
* Wireless Communication
* Test and Measurement
The THS4508 is a wideband, fully-differential operational amplifier designed for single-supply 5-V data-acquisition systems. It has very low noise at 2.3 nV/sqrtHz, and extremely low harmonic distortion of -72 dBc HD2 and -79 dBc HD3 at 100 MHz with 2 VPP, G = 10 dB, and 1-kohm load. Slew rate is very high at 6400 V s 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 5-mV offset (typical) from the set voltage, when set within 0.5 V of mid-supply. The common-mode set point is set to mid-supply by internal circuitry, which may be over-driven from an external source.
The THS4508 is a high-performance amplifier that has been optimized for use in high performance, 5-V single supply data acquisition systems. The output has been optimized for best performance with its common-mode voltages set to mid supply, and the input has been optimized for best performance with its common-mode voltage set to 0.7 V. High performance at a low power-supply voltage makes for high-performance single-supply 5-V data-acquisition systems with a minimum parts count. The combined performance of the THS4508 in a gain of 10-dB driving the ADS5500 ADC, sampling at 125 MSPS, is 82-dBc SFDR, and 68.3-dBc SNR with a -1-dBFS signal at 70 MHz.
