U4065B Datasheet, PDF (5/23 Pages) TEMIC Semiconductors – FM Receiver

MIXOUT1, MIXOUT2
18
ESD
19
LOE
U4065B
23
ESD
94 8782
Mixer output 1, 2:
The mixer output is an open collector of a bipolar transis-
tor. The minimum voltage at this pins is 5 V (V_S-voltage
swing). The dc current into this pins is typically 9 mA.
Good LO- and RF suppression at the mixer output can be
achieved by symmetrical load conditions at the pins MIX-
OUT1 and MIXOUT2.
IF1IN
94 8785
Emitter of the local oscillator:
An external capacitor is connected between LOE and
ground. The ground pin of this capacitor is to connect to
the pin GND5. GND5 is the chip internal ground of the
local oscillator.
LOB
24
21
V_ref
330
ESD
ESD
94 8784
Input of the first IF amplifier:
W The typical input resistance is 330 . The dc voltage is
nearly the same one as the reference voltage. Please avoid
dc current at this pin.
94 8786
Base of the local oscillator:
The tank of the local oscillator is connected at pin LOB.
The ground pin of this tank is to connect to the pin GND5.
GND5 is the chip internal ground into pin 24 of the local
W ^{oscillator. The resonant resistance of the tank should be}
about 250 . Minimum Q of the unloaded tank is 50.
Rev. A3, 15-Oct-98
5 (23)