Datasheet ADL5331 (Analog Devices)

1 MHz to 1.2 GHz VGA with 30 dB Gain Control Range Data Sheet ADL5331 FEATURES FUNCTIONAL BLOCK DIAGRAM Voltage-controlled amplifier/attenuator GAIN ENBL VPS2 VPS2 VPS2 VPS2 Operating frequency: 1 MHz to 1.2 GHz VPS1 VPS2 Optimized for controlling output power GAIN ADL5331 High linearity: OIP3 47 dBm @ 100 MHz CONTROL COM1 COM2 Output noise floor: −149 dBm/Hz @ maximum gain LY R Input impedance: 50 Ω E O INHI US INPUT L AT OUTPUT OPHI Output impedance: 20 Ω RFIN GM AB U (TZ) RFOUT INUO RI N Wide gain-control range: 30 dB STAGE E STAGE A T INLO NT V OPLO AT Linear-in-dB gain control function: 40 mV/dB CO Single-supply voltage: 4.75 V to 5.25 V COM1 BIAS COM2 AND VREF APPLICATIONS VPS1 VPS2
01 0
Transmit and receive power control at RF and IF NC IPBS OPBS COM2 COM2 COM2
3- 59 07
CATV distribution
Figure 1.
GENERAL DESCRIPTION
The ADL5331 is a high performance, voltage-controlled The output of the high accuracy wideband attenuator is applied variable gain amplifier/attenuator for use in applications with to a differential transimpedance output stage. The output stage frequencies up to 1.2 GHz. The balanced structure of the signal provides a differential output at OPHI and OPLO, which must be path maximizes signal swing, eliminates common-mode noise pulled up to the supply with RF chokes or a center-tapped balun. and minimizes distortion while it also reduces the risk of spu- The ADL5331 consumes 240 mA of current including the out- rious feed-forward at low gains and high frequencies caused by put pins and operates off a single supply ranging from 4.75 V parasitic coupling. to 5.25 V. A power-down function is provided by applying a The 50 Ω differential input system converts the applied logic low input on the ENBL pin. The current consumption in differential voltage at INHI and INLO to a pair of differential power-down mode is 250 μA. currents with high linearity and good common-mode rejection. The ADL5331 is fabricated on an Analog Devices, Inc., pro- The signal currents are then applied to a proprietary voltage- prietary high performance, complementary bipolar IC process. controlled attenuator providing precise definition of the overall The ADL5331 is available in a 24-lead (4 mm × 4 mm), Pb-free gain under the control of the linear-in-dB interface. The GAIN LFCSP package and is specified for operation from ambient pin accepts a voltage from 0 V at a minimum gain to 1.4 V at a temperatures of −40°C to +85°C. An evaluation board is also full gain with a 40 mV/dB scaling factor over most of the range. available.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION BASIC CONNECTIONS GAIN CONTROL INPUT CMTS TRANSMIT APPLICATION Interfacing to AD9789 INTERFACING TO AN IQ MODULATOR SOLDERING INFORMATION EVALUATION BOARD SCHEMATIC OUTLINE DIMENSIONS ORDERING GUIDE