U4065B Datasheet, PDF (1/23 Pages) TEMIC Semiconductors – FM Receiver

U4065B
FM Receiver
Description
The IC U4065B is a bipolar integrated FM-frontend
circuit. It contains a mixer, an oscillator, two IF
preamplifiers and an unique interference sensor. The
device is designed for high performance car radio and
home receiver applications.
Features
D All frontend functions of a high performance FM-
receiver, except the RF preamplifier, are integrated
D Improved dynamic range by high current double
balanced mixer design and a new AGC conception
with 3 loops on chip
D Improved blocking and intermod behavior by use of
an unique “interference” sensor controlling the AGC
D Easy cascading of three IF filters (ceramic) by use of
two on-chip IF preamplifiers
D On-chip control functions are available for system
gain adjust (dB linear vs. dc current)
D Low noise LO design
D ESD protected
Block Diagram
ANT
RF tank
PIN
ATT
V_S
IF tank
19 18
16
14
15 _Mixer
IF gain adjust
IF BPF
20 21 4 7
IF 1
IF BPF
V_S
53
IF outp
IF BPF
2
IF 2
RF tank
V_tune
RF
D.N.C. 12
Inter-
ference
mixer
LO tank
23
Local
24
oscill.
AGC
wide band
& IF
IF&
detector
22 1
LO output
11
9
Interference
IF BPF
8
10
13
AGC adjust
(wide band)
Voltage
17
reg.
6
+
V_S
V_ref = 4 V
AGC level
V_S
94 8768
Rev. A3, 15-Oct-98
1 (23)