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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： | 2/7頁 |
| 文件大小： | 75K |
| 代理商： | U4459B |
U4459B
TELEFUNKEN Semiconductors
Rev. A1, 15-Jul-96
2 (7)
Pin Description
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
I
tun
GND
95 10696
V
gain
IF2
out
NC
IF1
in
V
tun
VS
BG
NC
NC
NC
LO
in
IF1
in
GND
LO
in
Figure 2.
6
7
13
in
IF2
out
NC
in
in
BG
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IF2 output
Not connected
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Not connected
Bandgap reference
(internal use only)
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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 1 to 16 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 8–9) for
the mixer stage can be applied symmetrically as well as
unsymmetrically.
The mixed signal (2nd IF) is fed through a buffer
amplifier to the output Pin 6. The control voltage can also
be used for an additional external preamplifier in the
tuner. This tuner-AGC with adjustable take over point
protects the IF1 input against overload.
Absolute Maximum Ratings
Reference point Pin 4, unless otherwise specified
Parameters
Symbol
V
s
I
s
Value
13.5
55
Unit
V
mA
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Supply voltage
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Pin 14
Pin 14
Supply current
Power dissipation
V
= 13.5 V
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Pin 14
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