Application Information
V
DD
C
3
C
2
X
1
C
1
R
1
XTAL
1
2
16
15
14
13
XTAL/CLOCK
V
DD
LPF(2) OUT
B MOD(2) IN
LPF(1) OUT
3
4
C
4
B MOD(1) IN
C
8
V
SS
C1 OUT
CHANNEL 1 OUTPUT
CHANNEL 1 INPUT
C1 IN
FX118
5
6
7
8
12
11
10
9
V
BIAS
C
C2 OUT
C2 AMP OUT
V
SS
R
5
7
R
3
C1 AMP OUT
CHANNEL 2 OUTPUT
CHANNEL 2 INPUT
C2 IN
C
5
R
2
R
4
C
6
V
SS
Component
R
1
R
2
R
3
C
5
R
4
R
5
C
6
C
1
=
Value
1.0MΩ
See Note
See Note
47pF
C
2
C
3
C
4
=
33pF
0.47µF
1.0µF
C
7
C
8
X
1
=
1.0µF
1.0µF
4.433619MHz
T
olerances
C =
±
20% R =
±
10%
NOTES
1. Configurations R
2
, R
3
, C
5
and R
4
, R
5
, C
6
should be chosen with respect to the specific application.
2. Operation of any CML microcircuit without a Xtal or clock input may cause device damage. To minimise damage
in the event of a Xtal/drive failure, it is recommended that the power rail (V
DD
) is fitted with a current limiting
device (resistor or fast-reaction fuse).
Fig.2 Recommended External Components
Rx Channel
RF
AMP
IF
AMP
DETECTION
BASE UNIT
FX118
DE-EMPHASIS
AF AMP
FM
CHANNEL 1 (C1)
RF
AMP
PRE-
EMPHASIS
CHANNEL 2 (C2)
FM
HYBRID
TRANSFORMER
AF AMP
TELEPHONE
LINE
MODULATION
Tx Channel
Rx Channel
RF
AMP
IF
AMP
DETECTION
FX118
DE-EMPHASIS
AF AMP
FM
CHANNEL 1 (C1)
RF
AMP
PRE-
EMPHASIS
CHANNEL 2 (C2)
FM
AF AMP
MODULATION
Tx Channel
HANDHELD UNIT
Fig.3 Example of the FX118 Employed in a Cordless Telephone Application
3
CMLMICRO [ CML MICROCIRCUITS ]
