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| FX118 Datasheet, PDF (3/7 Pages) CML Microcircuits – Duplex Frequency Inverter for Cordless Telephones | |||
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Application Information
C3
C2
C1
V DD
X1
R1
XTAL
1
2
LPF(1) OUT
3
C4
B MOD(1) IN
4
VSS
5
CHANNEL 1 OUTPUT
CHANNEL 1 INPUT
C5
R2
C1 OUT
6
R 3 C1 AMP OUT
7
C1 IN
8
FX118
16
XTAL/CLOCK
15
V DD
14
LPF(2) OUT
13
B MOD(2) IN
12
VBIAS
C2 OUT
11
C2 AMP OUT
10
9
C2 IN
C8
C7
VSS
R5
CHANNEL 2 OUTPUT
CHANNEL 2 INPUT
R4
C6
Component
R1
=
R2 R3 C5
R4 R5 C6
C1
Value
1.0Mâ¦
See Note
See Note
47pF
VSS
C2
=
33pF
C3
0.47µF
C4
1.0µF
Tolerances C = ±20% R = ±10%
C7
=
1.0µF
C8
1.0µF
X1
4.433619MHz
NOTES
1. Configurations R2, R3, C5 and R4, R5, C6 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 (VDD) is fitted with a current limiting
device (resistor or fast-reaction fuse).
Fig.2 Recommended External Components
RF
AMP
Rx Channel
IF
AMP
DETECTION
FM
RF
AMP
MODULATION
PRE-
EMPHASIS
FM
Tx Channel
CHANNEL 1 (C1)
CHANNEL 2 (C2)
BASE UNIT
FX118
DE-EMPHASIS
AF AMP
HYBRID
TRANSFORMER
AF AMP
RF
AMP
Rx Channel
IF
AMP
DETECTION
FM
RF
AMP
MODULATION
PRE-
EMPHASIS
FM
CHANNEL 1 (C1)
CHANNEL 2 (C2)
FX118
Tx Channel
HANDHELD UNIT
Fig.3 Example of the FX118 Employed in a Cordless Telephone Application
DE-EMPHASIS
AF AMP
AF AMP
TELEPHONE
LINE
3
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