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參數資料
| 型號： | U4459B |
| 英文描述： | IF Amplifier for Cable DVB Processing |
| 中文描述： | 中頻放大器有線DVB處理 |
| 文件頁數： | 1/7頁 |
| 文件大小： | 75K |
| 代理商： | U4459B |
U4459B
TELEFUNKEN Semiconductors
Rev. A1, 15-Jul-96
1 (7)
IF Amplifier for Cable DVB Processing
Description
The U4459B is an integrated bipolar circuit suitable for
the IF processing in cable-DVB receiver (
DVB
=
D
igital
V
ideo
B
roadcasting) and cable network application.
The circuit contains a wideband IF amplifier, mixer stage,
gain control for the IF amplifier and a tuner-AGC
(
A
utomatic
G
ain
C
ontrol) with adjustable take over point
for an additional external preamplifier (tuner).
Features
Input frequency range 30 to 50 MHz (1st IF)
Wideband IF amplifier with high linearity
Gain control of the IF amplifier by external
dc voltage
Mixer stage with local oscillator input
(symmetrical or unsymmetrical)
High output level of mixed signal (2nd IF)
(up to 2.4 V, peak-to-peak value)
Tuner-AGC with adjustable take over point for a
preamplifier
Supply voltage range 6.8 to 13.5 V
Package:
DIP16
1
16
3
IF1 in
8
9
5
13
2
IF1 in
Mixer
IF amp
IF gain
control
Bandgap
V
Tun
V
Gain
4,15
I
Tun
BG
GND
6
14
IF2 out
V
S
95 9636
LO in
LO in
Figure 1. Block diagram
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