2

Pin Number

Function

FX118DW

FX118P

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Xtal: Output of clock oscillator inverter.

No Internal Connection: It is recommended that, to improve noise conditions, this pin is connected to V

LPF(1) Out: The output of the Channel 1 Lowpass Filter. It is to be coupled to “B Mod(1) In” via a 1.0

µF

capacitor – see Figure 2.

B Mod(1) In: The input to Channel 1 balanced modulator. Internally biased at V

“LPF(1)” via a 1.0

µF capacitor – see Figure 2.

V

C1 Out: The analogue output of Channel 1.

C1 Amp Output: Channel 1 amplifier with external components (see Figure 2) can be used to provide gain in

the signal path.

C1 In: The negative input of Channel 1 Amplifier. Recommended external components are shown in Figure 2.

C2 In: The negative input of Channel 2 Amplifier. Recommended external components are shown in Figure 2.

C2 Amp Output: Channel 2 amplifier with external components (see Figure 2) can be used to provide gain in

the signal path.

C2 Out: The analogue output of Channel 2.

V

See Figure 2.

B Mod(2) In: The input to Channel 2 balanced modulator. Internally biased at V

“LPF(2)” via a 1.0

µF capacitor – see Figure 2.

LPF(2) Out: The output of the Channel 2 Lowpass Filter. It is to be coupled to “B Mod(2) In” via a 1.0

µF

capacitor – see Figure 2.

V

– 5.0v) is required. Levels and voltages

within the Duplex Frequency Inverter are dependent upon this supply.

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.