AD8348ARU Analog Devices Inc, AD8348ARU Datasheet - Page 19
AD8348ARU
Manufacturer Part Number
AD8348ARU
Description
IF QUADRATURE DEMODULATOR
Manufacturer
Analog Devices Inc
Datasheet
1.AD8348ARUZ.pdf
(28 pages)
Specifications of AD8348ARU
Rohs Compliant
NO
Rohs Status
RoHS non-compliant
Function
Demodulator
Lo Frequency
100MHz ~ 2GHz
Rf Frequency
50MHz ~ 1GHz
P1db
-22dBm
Gain
25.5dB
Noise Figure
10.75dB
Current - Supply
58mA
Voltage - Supply
2.7 V ~ 5.5 V
Package / Case
28-TSSOP
Lead Free Status / RoHS Status
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VCMO. This forms a high-pass response for the baseband
signal path with a lower 3 dB frequency of
Alternatively, the user can externally adjust the dc offset by driving
IOFS (QOFS) with a digital-to-analog converter or other voltage
source. In this case, the baseband circuit operates all the way down
to dc (f
and can be easily overridden with an external voltage source.
The nominal voltage level applied to IOFS (QOFS) to produce
a 0 V differential offset at the baseband outputs is 900 mV.
f
PASS
PASS
= 0 Hz). The integrator output current is only 50 μA
=
2
π
×
2650
1
Ω
×
COFS
Rev. A | Page 19 of 28
The IOFS (QOFS) pin must be connected to either a bypass
capacitor (>0.1 μF) or an external voltage source to prevent the
feedback loop from oscillating.
The feedback loop will be broken at dc if an ac-coupled baseband
filter is placed between the mixer outputs and the baseband
amplifier inputs. If an ac-coupled filter is implemented, the user
must handle the offset compensation via some external means.
AD8348