Texas Instruments has introduced its first differential amplifiers which are programmable for variable gain.
The 2.4GHz LMH6881 single-channel and 2.4GHz LMH6882 dual-channel amplifiers have a 6dB to 26dB gain range.
"The programmable gain control in the LMH6881 and LMH6882 eliminates the need for gain-setting resistors and their associated mismatch errors,enabling more robust systems for applications,such as medical,test and measurement,military,wireless communications,and microwave backhaul,"said the supplier.
Noise figures at maximum gain(26dB)and 100MHz input frequency are:9.7dB noise figure,44-dBm OIP3,and-100 dBc HD3.
Gain control can be implemented via SPI bus or dedicated pins,with no external resistors needed.
The devices support DC/AC coupling and single-ended-to-differential conversion which can remove the need for a balun.
The LMH6882's channel gain matching is 0.2dB and phase matching is 1.5 degrees,which provides image rejection for wideband zero IF and I/Q sampling applications.
Drive high-performance ADCs:Drive high-speed analog-to-digital converters(ADCs),such as the 8-bit,single-channel ADC083000;10-bit,dual-channel
ADC10D1500;12-bit,dual-channel ADC12D1800RF;and 14-bit,single-channel ADS4149.
