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Series Information for AD8348ARUZ - Analog Devices


  • feature
    Integrated I/Q demodulator with IF VGA amplifier Operating IF frequency 50 MHz to 1000 MHz (3 dB IF BW of 500 MHz driven from RS = 200 u03a9) Demodulation bandwidth 75 MHz Linear-in-decibel AGC range 44 dB Third-order intercept IIP3 +28 dBm @ minimum gain (FIF = 380 MHz) IIP3 u22128 dBm @ maximum gain (FIF = 380 MHz) Quadrature demodulation accuracy Phase accuracy 0.5u00b0 Amplitude balance 0.25 dB Noise figure 11 dB @ maximum gain (FIF = 380 MHz) LO input u221210 dBm Single supply 2.7 V to 5.5 V Power-down mode Compact, 28-lead TSSOP package



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 char- acteristic 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. Optionally, the IF VGA can be disabled and bypassed. In this mode, the IF signal is applied directly to the quadrature mixer inputs via the MXIP and MXIN pins. Separate I- and Q-channel baseband amplifiers follow the baseband outputs of the mixers. The voltage applied to the VCMO pin sets the dc common-mode voltage level at the baseband outputs. Typically, VCMO is connected to the internal VREF voltage, but it can also be connected to an external voltage. This flexibility allows the user to maximize the input dynamic range to the ADC. Connecting a bypass capacitor at each offset compensation input (IOFS and QOFS) nulls dc offsets produced in the mixer. Offset compensation can be overridden by applying an external voltage at the offset compensation inputs. The mixers’ outputs are brought off-chip for optional filtering before final amplification. Inserting a channel selection filter before each baseband amplifier increases the baseband amplifiers’ signal handling range by reducing the amplitude of high level, out-of-channel interferers before the baseband signal is fed into the I/Q baseband amplifiers. The single-ended mixer output is amplified and converted to a differential signal for driving ADCs.


Frequency Min:
Frequency Max:
Supply Voltage Min:
Supply Voltage Max:
RF IC Case Style:
No. of Pins:
Operating Temperature Min:
Operating Temperature Max:
Product Range:
AD8348 Series
MSL 1 - Unlimited
No SVHC (07-Jul-2017)
Base Number:
Frequency Range:
50MHz to 1GHz
IC Temperature Range:
Local Oscillator Frequency Range:
100MHz to 2GHz
Operating Temperature Range:
-40°C to +85°C
RF Type:
Supply Voltage Range:
2.7V to 5.5V
Termination Type:
Surface Mount Device

Alternate Descriptions

RS Components
AD8348 quadature demodulator & IF VGA
Newark Electronics
IC, IF QUADRATURE DEMODULATOR, 8348; Frequency Min:50MHz; Frequency Max:1GHz; Supply Voltage Min:2.7V; Supply Voltage Max:5.5V; RF IC Case Style:TSSOP; No. of Pins:28Pins; Operating Temperature Min:-40°C; Operating Temperature RoHS Compliant: Yes
Richardson RFPD
RS Components UK
AD8348 quadature demodulator & IF VGA
RS Components DE
Analog Devices AD8348ARUZ Quadraturdemodulator 75MHz, Verstärkung 25.5dB, TSSOP 28-Pin Rauschfaktor : 10.75dB Montage-Typ : SMD Versorgungsstrom max. : 58 mA Abmessungen : 9.7 x 4.4 x 1.05mm Länge : 9.7mm Arbeitsspannnung max. : 5,5 V Betriebstemperatur max. : +85 °C Arbeitsspannnung min. : 2,7 V
RS Components HK
AD8348 quadature demodulator & IF VGA
RS Components JP
RS Components FR
AD8348 quadature demodulator & IF VGA
RS Components CN
AD8348 quadature demodulator & IF VGA
RS Components ES
AD8348 quadature demodulator & IF VGA
RS Components NL
AD8348 quadature demodulator & IF VGA
RS Components NO
RS Components SG
AD8348 quadature demodulator & IF VGA
RS Components TW
Demodulatore quadruplo TSSOP AD8348ARUZ