The F1456 is a High-Gain/High-Linearity 2100MHz to 2950MHz TX Variable Gain Amplifier used in transmitter applications. The F1456 TX VGA provides 32.1dB maximum gain with +38dBm OIP3 and 3.9dB noise figure. Up to 31.5dB gain control is achieved using the combination of a digital step attenuator (DSA) plus KLIN™ RF variable gain amplifier gain adjustment. This device uses a single 5V supply and 215mA of ICC. This device is packaged in a 6 × 6 mm, 28-QFN with 50Ω single-ended RF input and RF output impedances for ease of integration into the signal path.


  • Broadband 2100MHz to 2950MHz
  • 32.1dB max gain
  • 3.9dB NF @ max gain (2650MHz)
  • 31.5dB total gain control range, 0.5dB step
  • < 2 dB overshoot between major gain transitions 
  • +38dBm OIP3
  • Maintains +21.5dBm output P1dB over 13dB gain adjustment range
  • SPI interface for DSA control
  • Single 5V supply voltage
  • ICC = 215mA
  • Up to +105 °C TCASE operating temperature
  • 50Ω input and output impedance
  • Standby for power savings
  • Pin compatible 700–1100MHz and 1400–2300MHz versions
  • 6 × 6 mm, 28-QFN package




Type Title Date
Datasheet PDF 8.75 MB
Guide PDF 2.24 MB
Guide PDF 2.83 MB
Overview PDF 1.15 MB
Product Change Notice PDF 32 KB
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Software & Tools - Software Log in to Download ZIP 169.81 MB
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Constant Linearity (KLIN) RF Technology by IDT

IDT’s KLIN (constant linearity) RF technology extends both OIP3 and output 1 dB compression point (P1dBO) amplifier gain settings. This is particularly valuable in transmitter designs where the gain of the device is maintained within a normal gain setting window about 6 dB below maximum gain. 

KLIN refers to Constant High Linearity Inner Amplifiers as the gain is adjusted. This technology extends the compression performance over a wide range of input powers, and also extends output third order intercept and corresponding inner modulation distortion performance over a wide range of output powers.

This technology is particularly advantageous in transmitter designs, where the gain of the device is maintained within a normal gain setting window.

This technology applies to some of IDT's high-gain, high-linearity transmitter variable gain amplifiers (VGAs). For more information, visit: http://www.idt.com/products/rf-products/variable-gain-amplifiers-vga.