U4459B TEMIC Semiconductors, U4459B Datasheet - Page 2

• Manufacturer Part Number: U4459B
• Description: IF Amplifier
• Manufacturer: TEMIC Semiconductors

Pin Description
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.
Absolute Maximum Ratings
Reference point Pin 4, unless otherwise specified
U4459B
Supply voltage
Supply current
Power dissipation
V
Junction temperature
Storage temperature
2 (7)
s
= 13.5 V
IF2
GND
IF1
V
LO
V
NC
I
gain
tun
out
tun
in
in
1
3
5
8
2
4
6
7
Figure 2.
Parameters
95 10696
Pin 14
Pin 14
Pin 14
16
15
14
13
12
11
10
9
IF1
GND
VS
BG
NC
NC
NC
LO
in
in
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.
Pin
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
Symbol
T
V
T
I
P
stg
s
s
j
Symbol
IF2
GND
V
GND
IF1
LO
LO
IF1
V
I
NC
NC
NC
NC
BG
VS
tun
gain
tun
out
in
in
in
in
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
TELEFUNKEN Semiconductors
–25 to +125
Value
+125
13.5
750
55
Function
Rev. A1, 15-Jul-96
Unit
mW
mA
V
C
C