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Cascadable IF VGAs with
Programmable RMS Detectors
Data Sheet
ADL5336
Rev. B
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FEATURES
Pair of VGAs with rms AGC detectors
VGA and AGC modes of operation
Continuous gain control range: 48 dB
Noise figure (NF) = 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
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
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 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.
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.
ADL5336
09550-001
VCM1
VPOS
VPOS
COM
MODE
ENBL
INP1
INM1
VPOS
VPOS
COM
SDO
DATA
OPP2
VCM2
COM
OPM2
OPP1 OPM1 IP2
A
IM2
A
COM IP2B IM2B
GAIN1 DTO1 GAIN2 DTO2 COMD VPSD LE CLK
X
2
X
2
SPI
VGA1
VGA2
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 8 Seite 31
- ・ Abmessungen des Paketumrisses on Seite 31
- ・ Teilenummerierungssystem on Seite 31
- ・ Blockdiagramm on Seite 1 Seite 18 Seite 21 Seite 26 Seite 27
- ・ Beschreibung der Funktionen on Seite 1 Seite 8 Seite 31
- ・ Technische Daten on Seite 1 Seite 4 Seite 7
- ・ Anwendungsbereich on Seite 1 Seite 21
- ・ Elektrische Spezifikation on Seite 9
