FX118 Datasheet, PDF (2/7 Pages) CML Microcircuits – Duplex Frequency Inverter for Cordless Telephones

Pin Number
FX118DW
FX118P
1
Xtal: Output of clock oscillator inverter.
Function
2
No Internal Connection: It is recommended that, to improve noise conditions, this pin is connected to V .
SS
3
LPF(1) Out: The output of the Channel 1 Lowpass Filter. It is to be coupled to “B Mod(1) In” via a 1.0µF
capacitor – see Figure 2.
4
B Mod(1) In: The input to Channel 1 balanced modulator. Internally biased at V /2 it is to be coupled to
DD
“LPF(1)” via a 1.0µF capacitor – see Figure 2.
5
V : Negative supply (GND).
SS
6
C1 Out: The analogue output of Channel 1.
7
C1 Amp Output: Channel 1 amplifier with external components (see Figure 2) can be used to provide gain in
the signal path.
8
C1 In: The negative input of Channel 1 Amplifier. Recommended external components are shown in Figure 2.
9
C2 In: The negative input of Channel 2 Amplifier. Recommended external components are shown in Figure 2.
10
C2 Amp Output: Channel 2 amplifier with external components (see Figure 2) can be used to provide gain in
the signal path.
11
C2 Out: The analogue output of Channel 2.
12
V:
BIAS
The
internal
analogue
bias
line
at
V /2.
DD
It
should
be
decoupled
to
V
SS
via
a
1.0µF
or
greater
capacitor.
See Figure 2.
13
B Mod(2) In: The input to Channel 2 balanced modulator. Internally biased at V /2 it is to be coupled to
DD
“LPF(2)” via a 1.0µF capacitor – see Figure 2.
14
LPF(2) Out: The output of the Channel 2 Lowpass Filter. It is to be coupled to “B Mod(2) In” via a 1.0µF
capacitor – see Figure 2.
15
V_DD: The positive supply rail. A single positive supply voltage (3.0v – 5.0v) is required. Levels and voltages
within the Duplex Frequency Inverter are dependent upon this supply.
16
Xtal/Clock: 4.433619 MHz Xtal or externally derived clock is injected at this pin. See Figure 2. Operation of
the FX118 without a Xtal or clock input may cause device damage.
2