10 MHz to 3 GHz VGA with
60 dB Gain Control Range
ADL5330
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Voltage-controlled amplifier/attenuator
Operating frequency 10 MHz to 3 GHz
Optimized for controlling output power
High linearity: OIP3 31 dBm @ 900 MHz
Output noise floor: −150 dBm/Hz @ 900 MHz
50 Ω input and output impedances
Single-ended or differential operation
Wide gain-control range: −34 dB to +22 dB @ 900 MHz
Linear-in-dB gain control function, 20 mV/dB
Single-supply 4.75 V to 5.25 V
GAIN
VPS1
ENBL VPS2 VPS2 VPS2 VPS2
VPS2
GAIN
CONTROL
COM1
INHI
COM2
OPHI
INPUT
GM
O/P
(TZ)
RFOUT
RFIN
STAGE
STAGE
INLO
OPLO
COM2
BALUN
COM1
BIAS
AND
VREF
VPS1
VREF
VPS2
APPLICATIONS
Transmit and receive power control at RF and IF
IPBS OPBS COM1 COM2 COM2
Figure 1.
GENERAL DESCRIPTION
The ADL5330 is a high performance, voltage-controlled
variable gain amplifier/attenuator for use in applications with
frequencies up to 3 GHz. The balanced structure of the signal
path minimizes distortion while it also reduces the risk of
spurious feed-forward at low gains and high frequencies caused
by parasitic coupling. While operation between a balanced
source and load is recommended, a single-sided input is
internally converted to differential form.
The output of the high accuracy wideband attenuator is applied
to a differential transimpedance output stage. The output stage
sets the 50 Ω differential output impedances and drives
Pin OPHI and Pin OPLO. The ADL5330 has a power-down
function. It can be powered down by a Logic LO input on the
ENBL pin. The current consumption in power-down mode is
250 μA.
The ADL5330 is fabricated on an ADI proprietary high
performance, complementary bipolar IC process. The ADL5330
is available in a 24-lead (4 mm × 4 mm), Pb-free LFCSP_VQ
package and is specified for operation from ambient
temperatures of −40°C to +85°C. An evaluation board is also
available.
The input impedance is 50 Ω from INHI to INLO. The outputs
are usually coupled into a 50 Ω grounded load via a 1:1 balun. A
single supply of 4.75 V to 5.25 V is required.
The 50 Ω input system converts the applied voltage to a pair of
differential currents with high linearity and good common
rejection even when driven by a single-sided source. The signal
currents are then applied to a proprietary voltage-controlled
attenuator providing precise definition of the overall gain under
the control of the linear-in-dB interface. The GAIN pin accepts
a voltage from 0 V at minimum gain to 1.4 V at full gain with a
20 mV/dB scaling factor.
Rev. A
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