U2760B
CT2-RX/TX IC
Description
The IC for digital cordless telephone application is
fabricated using TEMIC’s most advanced UHF process.
It covers the CT2 band (864 MHz to 868 MHz) as well as
the CT2 Plus band (up to 952 MHz). The RX/TX circuit
provides the down conversion to the data stream and the
up conversion from the first IF. In conjunction with
TEMIC’s RF front end, Twin PLL, I/Q modulator and
AMDs CT2 PhoX
TM
controller AM 79C4xx a complete
CT2 IC kit is available.
Electrostatic sensitive device.
Observe precautions for handling.
Features
D
Low supply voltage 2.9 V typical (min. 2.7 V)
D
Provides down conversion to the data stream,
D
D
D
D
D
D
D
up conversion from the first IF
Integrated UHF and VHF VCOs
Low noise figure of RX path (NF 10 dB)
RX and TX power down
First IF filter used for transmit as well receive mode
Temperature compensated logarithmic
Receiver
Signal Strength Indicator
(RSSI) with a 75 dB
dynamic range
Low power consumption in RX and TX mode
(<20 mA typ.)
SSO28 plastic package
Benefits
D
Low power consumption results in extended talk time
D
Few external components and very small package
save space
v
Block Diagram (Simplified Schematic)
MX1/3 MX1/3 MX2/4 MX2/4
outp
outn in
nin
RX enable
MX1 in
VCO1 ref
VCO1 tank
VCO1 out
MX4 outn
MX4 outp
TX enable
26
15
21
7
6
5
22
23
24
9
VCC
vco/lf
8
GND
vco/lf
3
MX3 in
17
18
16
MX4
MX3
COMP
VCO1
VCO2
DEMOD
MX1
MX2
LIMIT
RSSI
27
RSSI out
25
1
2
MX2 out
28
LIMIT in VCC
4
20
GND
19
10 pF
11
12
QUAD
DEMOD out
COMP in
100k
W
13
100k
W
COMP cap
14
10
94 9532
VCO2 VCO2 VCO2
ref
tank out
RXdata
Figure 1.
Rev. A3, 05-Oct-98
1 (14)
TEMIC [ TEMIC SEMICONDUCTORS ]
