ADL5336ACPZ-R7 Просмотр технического описания (PDF) - Analog Devices
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ADL5336ACPZ-R7 Datasheet PDF : 30 Pages
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Data Sheet
FEATURES
Pair of VGAs with rms AGC detectors
VGA and AGC modes of operation
Continuous gain control range: 48 dB
Noise figure = 6.8 dB at maximum gain
IMD3 >62 dBc for 1.0 V p-p composite output
Differential input and output
Multiplexed inputs for VGA2
Programmable detector AGC setpoints
Programmable VGA maximum gain
Power-down feature
Single 5 V supply operation
APPLICATIONS
Point-to-multipoint radios
Instrumentation
Medical
GENERAL DESCRIPTION
The ADL5336 consists of a pair of variable gain amplifiers (VGAs)
designed for cascaded IF applications. The amplifiers have linear-
in-dB gain control and operate from low frequencies to 1 GHz.
Their excellent gain conformance over the control range and
flatness over frequency are due to Analog Devices, Inc., patented
X-AMP® architecture, an innovative technique for implementing
high performance variable gain control.
Each VGA has 24 dB of gain control range. Their maximum gain
can be independently programmable over a 6 dB range via the
SPI. The VGAs can be cascaded to provide a total range of 48 dB.
When connected to a 50 Ω source through a 1:4 balun, the gain
is 6 dB higher. The second VGA has an SPI programmable input
switch that selects one of two external inputs.
Cascadable IF VGAs with
Programmable RMS Detectors
ADL5336
FUNCTIONAL BLOCK DIAGRAM
COM OPP1 OPM1 IP2A IM2A COM IP2B IM2B
VCM1
VPOS
INP1
VGA1
INM1
VPOS
X2
COM
MODE
ENBL
VGA2
X2
ADL5336
SPI
VCM2
VPOS
OPP2
OPM2
VPOS
COM
SDO
DATA
GAIN1 DTO1 GAIN2 DTO2 COMD VPSD LE CLK
Figure 1.
When driven from a 200 Ω source or from a 50 Ω source through
a 1:4 balun, the noise figure (NF) for the composite amplifier is
6.8 dB at maximum gain. The output of each VGA can drive
100 Ω loads to 5 V p-p maximum.
Each VGA has an independent square law detector for autonomous,
automatic gain control (AGC) operation. Each detector setpoint
can be programmed independently through the SPI from −24 dBV
to −3 dBV in 3 dB steps. When both VGAs are arranged in AGC
mode and are programmed to the same setpoint, the composite NF
increases to 9 dB when backed off by 18 dB from maximum gain.
The ADL5336 operates from a 5 V supply and consumes a typical
supply current of 80 mA. When disabled, it consumes 4 mA. It is
fabricated in an advanced silicon-germanium BiCMOS process and
is available in a 32-lead exposed paddle LFCSP package. Performance
is specified over a −40°C to +85°C temperature range.
Rev. C
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