F1240 Datasheet | IDT

Description The F1240 is a dual channel IF variable gain amplifier for diversity basestation receivers. Each channel has 31.5d B of total attenuation and a 0.5d B attenuation step. The device offers significantly better noise and distortion performance than currently available devices. It is packaged in a pact 5mm x 5mm QFN with 200Ω differential input and output impedances for ease of integration into the receiver lineup. petitive Advantage The F1240 IF VGA improves system signal-to-noise (SNR), especially at lower gain settings. With IDT’s proprietary Flat Noise TM technology both OIP3 and noise figure 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 time, less than 15ns, gain step of 0.5d B coupled with the excellent differential linearity allow for signal to noise ratio (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 for more details and benefits of the F1240 in IF sampling receivers. Typical Applications - Base Station 2G, 3G, 4G, TDD radio cards - Repeaters and E911 systems - Digital Pre-Distortion - Point to Point Infrastructure - Public Safety Infrastructure Features - Ideal for systems with high SNR requirements - 20d B typical Maximum Gain - 31.5d B gain control range - 6 bit control via serial or parallel control - 0.5d B Gain Steps - Excellent Noise Figure : 4.0d B - NF degrades just 1.3d B @ 10d B below Max Gain - 200Ω Differential Matched Input - 200Ω Differential Matched Output - No termination resistors required - 10MHz - 500MHz frequency range - Ultra-Linear: OIP3 +47d Bm typical - Excellent 2nd Harmonic Rejection - External current setting resistors - Very...