U4459B

Manufacturer Part NumberU4459B
DescriptionIF Amplifier
ManufacturerTEMIC Semiconductors
U4459B datasheet
 


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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.
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)
IF amp
1
IF1 in
16
IF1 in
3
I
Tun
TELEFUNKEN Semiconductors
Rev. A1, 15-Jul-96
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).
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
LO in
8
9
Mixer
IF gain
control
Bandgap
2
5
13
V
V
BG
Tun
Gain
Figure 1. Block diagram
U4459B
95 9636
6
IF2 out
14
V
S
4,15
GND
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U4459B Summary of contents

  • Page 1

    ... 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. Features D Input frequency range MHz (1st IF) D Wideband IF amplifier with high linearity D Gain control of the IF amplifier by external ...

  • Page 2

    ... Figure 2. Circuit Description The U4459B consists of a controllable 3-stage wideband amplifier, a mixer, IF-AGC and a tuner-AGC with adjustable take over point. The IF1 input voltage is applied at Pin and it is fed via a 3-stage gain controlled wideband amplifier to the mixer. The wide- band amplifier with high linearity is gain controlled by external dc voltage. The oscillator voltage (Pin 8– ...

  • Page 3

    ... R 1 Pin Pin 8–9 v 100 Pin 4.5 lim V 1.7 lim res I out 1.5 I 2.0 4.0 tun U4459B Unit V C Unit K/W Max. Unit 13 120 V RMS 50 MHz RMS 50 MHz MHz 20 mV 5.0 mA 2.5 6 (7) ...

  • Page 4

    ... IF2 out Tuner AGC IF gain control Figure 3. Test circuit + U4459B Tuner AGC IF gain IF2 out control Figure 4. Basic application circuit 10 nF 2:1 LO input 200 9637 *) depends on application ...

  • Page 5

    ... W W 5.6 k 5.6 k Figure 6. Local oscillator input 6 94 9242 Figure 7. IF2 output TELEFUNKEN Semiconductors Rev. A1, 15-Jul-96 94 9230 Figure 8. IF gain control input 94 9243 Figure 9. Tuner-AGC take over point 94 9229 3 Figure 10. Tuner-AGC output U4459B 9228 5 (7) ...

  • Page 6

    ... U4459B Dimensions in mm Package: DIP16 6 (7) 94 9128 TELEFUNKEN Semiconductors Rev. A1, 15-Jul-96 ...

  • Page 7

    ... TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone 7131 67 2831, Fax number 7131 67 2423 TELEFUNKEN Semiconductors Rev. A1, 15-Jul-96 unauthorized use. U4459B 7 (7) ...