AD8348:  50 MHz to 1000 MHz Quadrature Demodulator

The AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF), variable gain amplifier (VGA), and integrated baseband amplifiers. It is suitable for use in ...More

AD8348:  50 MHz to 1000 MHz Quadrature Demodulator

Product Description

The AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF), variable gain amplifier (VGA), and integrated baseband amplifiers. It is suitable for use in communications receivers, performing quadrature demodulation from IF directly to baseband frequencies. The baseband amplifiers are designed to interface directly with dual-channel ADCs, such as the AD9201, AD9283, and AD9218, for digitizing and post-processing.

The IF input signal is fed into two Gilbert cell mixers through an X-AMP® VGA. The IF VGA provides 44 dB of gain control. A precision gain control circuit sets a linear-in-decibel gain characteristic for the VGA and provides temperature compensation. The LO quadrature phase splitter employs a divide-by-2 frequency divider to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range.

The AD8348 is fabricated on an advanced bipolar process, operating on a single 3 or 5 volt supply, packaged in space saving 28 lead thin shrunk small outline (TSSOP) package and fully specified over the –40 to +85 C temperature range

Samples AD8348ARU and evaluation boards AD8348-EVAL are available

Other Modulator/Demodulator products

    AD8345 250MHz – 1GHz RF/IF Modulator
    AD8346 800MHz – 2.5GHz Modulator
    AD8347 800MHz – 2.7GHz Demodulator
    AD8349 700MHz – 2.7GHz Modulator

Features

  • 50 MHz – 1000 MHz RF input range
  • Integrated 45 dB linear-in-dB VGA IF amplifier
  • Integrated baseband output amplifiers
  • Demodulation bandwidth 75 MHz
  • Quadrature phase accuracy 0.5°
  • Amplitude balance 0.25 dB
  • Third order intercept IIP3
    +28 dBm (min gain)
  • Noise figure 11 dB (max gain)
  • Low LO drive –10 dBm
  • Single supply 2.7 V to 5.5 V with power down

Diagrams

AD8348 Diagram
Functional Block Diagram for AD8348

Specifications

Function Demod
RF Freq (MHz) 50 to 1000
IQ Freq (MHz) 75MHz
Phase Error (deg) 0.5Deg
Amplitude Error (dB) 0.25dB
VGA Range (dB) 45dB
NF 11dB
Voltage Supply (V) 2.7 to 5.5
Supply Current (max) 58mA
Package 28-Lead TSSOP

Explore Other Products

Part# Function RF Freq (MHz) IQ Freq (MHz) Phase Error (deg) Amplitude Error (dB) VGA Range (dB) Noise Floor (dBm/Hz) Voltage Supply (V) Supply Current (max) Package Price* (1000-4999)
AD630 Demod, Mod dc to 2 - - - - - +/- 15 5 20-Lead DIP $6.25
AD8333 Demod dc to 50 - 0.1 0.05 - -161 +/- 5 44 32-Lead LFCSP $9.06
AD8339 Demod dc to 50 50 1 0.25 - - 4.5 to 5.5 35 40-Lead LFCSP $12.09
AD8340 Vector Mod 700 to 1000 - - - - - 5 130 24-Lead LFCSP $7.59
AD8341 Vector Mod 1500 to 2400 - - - - -150.5 4.75 to 5.25 125 24-Lead LFCSP $7.59
AD8345 Mod 140 to 1000 80 0.5 0.2 - -155 2.7 to 5.5 65 16-Lead Tssop $5.02
AD8346 Mod 800 to 2500 70 1 0.2 - -147 2.7 to 5.5 45 16-Lead Tssop $4.45
AD8347 Demod 800 to 2700 65 1 0.3 69.5 - 2.7 to 5.5 64 28-Lead TSSOP $5.85
AD8348 Demod 50 to 1000 75 0.5 0.25 45 - 2.7 to 5.5 58 28-Lead TSSOP $5.01
AD8349 Mod 700 to 2700 160 0.3 0.1 - -156 5 135 16-Lead Tssop $5.02
ADL5370 Mod 250 to 1300 700 - - - -156 4.75 to 5.5 210 24-Lead LFCSP $5.04
ADL5371 Mod 700 to 1300 700 - - - -156 4.75 to 5.5 175 24-Lead LFCSP $5.04
ADL5372 Mod 1500 to 2500 700 - - - -158 4.75 to 5.5 175 24-Lead LFCSP $5.04
ADL5373 Mod 2300 to 3000 700 - -