IDTF1240NBGI

DATASHEET Dual Intermediate Frequency Digital Variable Gain Amplifier IDTF1240NBGI GENERAL DESCRIPTION The IDTF1240 (0.5 dB steps) is an IF VGA for Diversity Basestation receivers. The device offers significantly better Noise and Distortion performance than currently available devices. It is packaged in a compact 5x5 Thin QFN with 200 ohm differential input and output impedances for ease of integration into the receiver lineup. COMPETITIVE ADVANTAGE The IDTF1240 IF VGA improves system SNR, especially at lower gain settings. Via IDT’s proprietary FlatNoiseTM technology both IP3O & NF are kept virtually flat while gain is backed off, enhancing SNR significantly under high level interferer conditions, and greatly benefiting 2G/3G/4G Multi-Carrier IF sampling receivers. The fast-settling, parallel mode gain step of 0.50 dB coupled with the excellent differential non-linearity allow for SNR to be maximized further by targeting the minimum necessary gain in small, accurate increments. The matched output does not require a terminating resistor, thus the gain and distortion performance are preserved when driving Bandpass Anti-Alias filters. See the ‘Applications Information’ section starting on Page 19 for more details of the benefits of the F1240 in IF sampling receivers. FEATURES Ideal for systems with high SNR requirements 20 dB typical Maximum Gain 31.5 dB gain control range 6 bit control 0.50 dB Gain Steps Excellent Noise Figure = 4.0 dB 5mm x 5mm 32 pin packag...