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05-10-2017

15dB Gain Differential Amplifier Delivers up to +50dBm OIP3 Linearity and Low Noise from 100kHz to 1.4GHz

Analog Devices » LTC6432-15

Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC6432-15, a wideband fully differential amplifier with 15 dB gain, offering linearity of up to +50.3 dBm OIP3 (output thirdorder intercept), very high OP1dB (output 1 dB compression point) of +22.7 dBm, and 3.2 dB noise figure at 150 MHz. In addition to its outstanding signal-to-noise at high frequencies, it maintains its dynamic range performance even at lower frequencies. That is because the LTC6432-15’s advanced SiGe bipolar design exhibits significantly lower 1/f noise frequency corner than that of GaAs or pHEMT FET based amplifiers. Hence its noise figure rises to only 6.6 dB at 100 kHz, compared to more than 20 dB for other amplifiers. The LTC6432-15 effectively extends the useful bandwidth and dynamic range performance for many applications that process low frequency signals. Moreover, the LTC6432-15 achieves superior stability over temperature, power supply ranges and from device to device compared to GaAs and pHEMT amplifiers.

Analog Devices - LTC6432-15

The LTC6432-15’s high dynamic range and extended bandwidth to low frequencies broaden its usefulness and improve performance in a wide range of amplifier applications including high sample rate A/D converter drivers, cable network amplifiers, broadband signal source conditioning, radar receiver IF amplifiers, software defined radio, VHF/UHF broadcast radios and RF test instruments.

The LTC6432-15 differential inputs and outputs are internally 100 Ω terminated. Its inputs are matched from 100 kHz to 1.4 GHz, with better than 10 dB return loss over the full bandwidth. The output is also matched from 100 kHz to 1 GHz. 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.

OIP3 and S21 vs Frequency
OIP3 and S21 vs Frequency.

The LTC6432-15 operates from a single 5 V supply. It draws a nominal 166 mA supply current. The device is specified for operation over a case temperature range from –40 °C to 85 °C. The LTC6432-15 is available in a 4 mm × 4 mm plastic QFN package in two grades: a B-grade with all typical parametric performance at $3.69 each in 1,000-piece quantities, and a higher performance A-grade with tested and guaranteed specifications at $6.44 each. Both are available immediately from stock.

DC2496A - 100 kHz to 1000 MHz Differential ADC Driver/IF/RF Amplifier
DC2496A – 100 kHz to 1000 MHz Differential ADC Driver/IF/RF Amplifier.

Summary of Features: LTC6432-15

  • Operating Frequency: 100 kHz to 1.4 GHz
  • Output IP3 (150 MHz):
    • A-Grade: +50.3 dBm
    • B-Grade: +47 dBm
  • Output P1dB: +22.7 dBm
  • Differential Power Gain: 15.9 dB
  • Noise Figure (150 MHz): 3.2 dB
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