U2759B

www.DataSheet4U.com U2759B IF Signal Processing for DAB Description The U2759B is a bipolar integrated IF signal processing circuit. It is designed for DAB (Digital Audio Broadcasting) applications. Features D High linearity of the complete circuit D 3-stage gain controlled wideband amplifier D Internal AGC loops D AGC time constants and thresholds adjustable D Mixer: double balanced high current Gilbert Cell Block Diagram DC 11 IF1IN IF1IN 16 6 IF2OUT 1 7 3 14 4 GND 15 8 LO LO Figure 1. 9 5 AGCT 10 THRIF 12 VREF BG 13 GND NC VS 9144 AGCPRE THRPRE Bandgap 2 Ordering and Package Information Extended Type Number U2759B-A U2759B-AFL U2759B-AFLG3 Package DIP16 SO24 SO24 Remarks Taping according ICE-286-3 TELEFUNKEN Semiconductors Rev. A1, 06-Sep-96 1 (9) Preliminary Information U2759B Pin Description IF1IN 1 THRPRE 2 16 IF1IN 15 GND 14 VS 13 BG 12 VREF 11 DC 10 THRIF 9 12585 AGCPRE 3 GND AGCT 4 5 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol IF1IN THRPRE AGCPRE GND AGCT IF2OUT NC LO LO THRIF DC VREF BG VS GND IF1IN Function IF1 input AGC-threshold for pre-amplifier AGC for pre-amplifier Ground AGC time constant for IF amplifier IF2 output Not connected Local oscillator Local oscillator AGC-threshold for IF amplifier DC-level Reference voltage Bandgap Supply voltage Ground IF1 input IF2OUT 6 NC LO 7 8 Figure 2. Pinning DIP16 LO IF1IN 1 THRPRE 2 NC 3 24 IF1IN 23 GND 22 NC 21 NC 20 VS 19 BG 18 VREF 17 DC 16 THRIF 15 14 NC NC AGCPRE 4 GND AGCT NC IF2OUT NC 5 ...