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
DD
/2 it is to be coupled to
“LPF(1)” via a 1.0µF capacitor – see Figure 2.
5
V
SS
:
Negative supply (GND).
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
DD
/2. 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
DD
/2 it is to be coupled to
“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
CMLMICRO [ CML MICROCIRCUITS ]
