IF Amplifier
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U4459B
IF Amplifier for Cable DVB Processing
Description
The U4459B is an integrated bipolar circui...
Description
www.DataSheet4U.com
U4459B
IF Amplifier for Cable DVB Processing
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
14
VS
2 VTun
5 VGain
13 BG
4,15 GND
Figure 1. Block diagram
TELEFUNKEN Semiconductors Rev. A1, 15-Jul-96
1 (7)
U4459B
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
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