AD8369

FEATURES Digitally Controlled Variable Gain in 3 dB Steps –5 dB to +40 dB (RL = 1 k⍀) –10 dB to +35 dB (RL = 200 ⍀) Less than 0.2 dB Flatness over a +20 MHz Bandwidth up to 380 MHz 4-Bit Parallel or 3-Wire Serial Interface Differential 200 ⍀ Input and Output Impedance Single 3.0 V–5.5 V Supply Draws 37 mA at 5 V Power-Down <1 mA Maximum APPLICATIONS Cellular/PCS Base Stations IF Sampling Receivers Fixed Wireless Access Wireline Modems Instrumentation 45 dB Digitally Controlled VGA LF to 600 MHz AD8369 FUNCTIONAL BLOCK DIAGRAM BIT3 BIT2 BIT1 BIT0 DENB SENB 3dB STEP GAIN CODE DECODE BIAS Gm CELLS VPOS PWUP FILT OPHI OPLO INHI INLO COMM CMDC COMM PRODUCT DESCRIPTION The AD8369 is a high performance digitally controlled variable gain amplifier (VGA) for use from low frequencies to a –3 dB frequency of 600 MHz at all gain codes. The AD8369 delivers excellent distortion performance: the two-tone, third-order intermodulation distortion is –69 dBc at 70 MHz for a 1 V ...