TheADL5243 is a high performance, digitally controlled variable gain amplifieroperating from 100 MHz to 4000 MHz.
The VGA integrates two high performance amplifiers and adigital step attenuator (DSA). Amplifier 1 (AMP1) is an internally matched gainblock amplifier with 20 dB gain, and Amplifier 2 (AMP2) is a broadband ¼ Wdriver amplifier. The DSA is 6-bit with a 31.5 dB gain control range, 0.5 dBsteps, and ±0.25 dB step accuracy. The attenuation of the DSA can be controlledusing a serial or parallel interface.
The gain block and DSA are internally matched to 50 Ω attheir inputs and outputs, and all three internal devices are separately biased.The separate bias allows all or part of the ADL5243 to be used, which allowsfor easy reuse throughout a design. The pinout of the ADL5243 also enables thegain block, DSA, or ¼ W driver amplifier to be first, giving the VGA maximumflexibility in a signal chain.
The ADL5243 consumes 175 mA and operates off a singlesupply ranging from 4.75 V to 5.25 V. The VGA is packaged in a thermallyefficient, 5 mm × 5 mm, 32-lead LFCSP and is fully specified for operation from−40°C to +85°C. A fully populated evaluation board is available.
| Richardson RFPD | |
|---|---|
| Product Category | RF Amplifiers |
| Product Number | ADL5243ACPZ-R7 |
| Product Name | RF & MW VGA |
| Frequency Range | 100 to 4000 MHz |
| Maximum Gain | 33.4 dB |
| Output Power | 26 dBm |
