LTC6432-15 surpasses GaAs or pHEMT FET amplifiers, says Analog Devices

The LTC6432-15, 15dB gain differential amplifier delivers up to +50dBm OIP3 linearity and low noise, says Analog Devices. The LTC6432-15 operates from 100kHz to 1.4GHz. In addition to offering linearity of up to +50.3dBm OIP3 (output third-order intercept), it provides very high OP1dB (output 1dB compression point) of +22.7dBm, and 3.2dB noise figure at 150MHz. In addition to its signal-to-noise at high frequencies, it maintains its dynamic range performance even at lower frequencies, says Analog Devices, using the LTC6432-15’s advanced SiGe bipolar design which exhibits significantly lower 1/f noise frequency corner than that of GaAs or pHEMT FET based amplifiers. The noise figure rises to only 6.6dB at 100kHz, compared to more than 20dB for other amplifiers. The LTC6432-15 effectively extends the useful bandwidth and dynamic range performance for many applications that process low frequency signals, says Analog Devices. The LTC6432-15 is also claimed to achieve superior stability over temperature, power supply ranges and from device to device, compared to GaAs and pHEMT amplifiers.

The LTC6432-15’s high dynamic range and extended bandwidth to low frequencies allow it to be used in a wide range of amplifier applications, including high sample rate analog to digital converter (ADC) drivers, cable network amplifiers, broadband signal source conditioning, radar receiver IF amplifiers, software defined radio, VHF/UHF broadcast radios and radio frequency (RF) test instruments.

The LTC6432-15 differential inputs and outputs are internally 100-Ohm-terminated. Inputs are matched from 100kHz to 1.4GHz, with better than 10dB return loss over the full bandwidth. The output is also matched from 100kHz to 1.0GHz. The amplifier needs only DC blocking capacitors at its inputs and outputs, two chokes for proper biasing, plus one feedback capacitor per output to extend its excellent gain flatness to low frequencies, says Analog Devices.

The LTC6432-15 operates from a single 5.0V supply. It draws a nominal 166mA supply current. It is specified for operation over a case temperature range from -40 to +85 degree C.  The LTC6432-15 is available in a 4.0 x 4.0mm plastic QFN package. Two grades are available, a B-grade with all typical parametric performance, and a higher performance A-grade with tested and guaranteed specifications.


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