U4459B Datasheet | TEMIC Semiconductors

Description The U4459B is an integrated bipolar circuit suitable for the IF processing in cable-DVB receiver (DVB = Digital Video Broadcasting) and cable network application. The circuit contains a wideband IF amplifier, mixer stage, gain control for the IF amplifier and a tuner-AGC (Automatic Gain Control) with adjustable take over point for an additional external preamplifier (tuner). Features D Input frequency range 30 to 50 MHz (1st IF) D Wideband IF amplifier with high linearity D Gain control of the IF amplifier by external dc voltage D Mixer stage with local oscillator input (symmetrical or unsymmetrical) D High output level of mixed signal (2nd IF) (up to 2.4 V, peak-to-peak value) D Tuner-AGC with adjustable take over point for a preamplifier D Supply voltage range 6.8 to 13.5 V Package: DIP16 LO in 8 IF1 in 1 IF amp LO in 9 95 9636 6 16 IF1 in Mixer IF2 out IF gain control 3 ITun Bandgap 2 VTun 5 VGain 13 BG 4,15 GND Figure 1. Block diagram TELEFUNKEN Semiconductors Rev. A1, 15-Jul-96 1 (7) Pin Description IF1in 1 Vtun 2 16 IF1in 15 GND 14 VS 13 BG 12 NC 11 NC 10 NC 9 95 10696 Itun 3 GND 4 Vgain 5 IF2out NC 6 7 LOin 8 LOin ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol IF1in Vtun Itun GND Vgain IF2out NC LOin LOin NC NC NC BG VS GND IF1in Function IF1 input Take over point of tuner-AGC Tuner-AGC output current Ground IF gain control input IF2 output Not connected Local oscillator input Local oscillator input Not connected Not connected Not connected Bandgap reference (internal use only) Supply voltage Ground IF1 input The mixed signal (2nd IF) is fed through a buffer amplifier to the...