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E94245-TE
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any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
Absolute Maximum Ratings (Ta = 25C)
Supply voltage
V
CC
5
V
Operating temperature
Topr
35 to +85
C
Storage temperature
Tstg
65 to +150
C
Allowable power dissipation
P
D
500
mW
Operating Conditions
Supply voltage
V
CC
2.7 to 3.6
V
Description
The CXA1741Q is an analog cellular(TACS/
NTACS) FM IF IC which incorporates an IF filter.
Features
Incorporates a ceramic filter function, which is
normally mounted externally.
Quadrature detection discriminator function.
This IC has almost all IF functions and is ideal for
reduction in set size because of few external parts
required.
The built-in filter permits mode changeover
between TACS and NTACS.
Wide operating voltage range (2.7 V to 3.6 V) and
low current consumption (Icc=10 mA (typ.) when
Vcc= 3 V).
Wide range and excellent temperature
characteristics for the RSSI (receiving signal
strength indicator).
Applications
Ideally suited for cellular phones, particularly hand-
held sets.
Structure
Bipolar silicon monolithic IC
IF Amplifier for Analog Cellular Communications
40 pin QFP (Plastic)
CXA1741Q
For the availability of this product, please contact the sales office.
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CXA1741Q
Block Diagram and Pin Configuration
(Top View)
1
2
3
4
5
6
7
8
9
10
11
19
18
17
16
15
14
13
12
20
31
32
33
34
35
36
37
38
39
40
23
22
21
24
25
26
27
30
28
29
XTALIN
XTALOUT
AGCPS
VREF
RSSIPS
T2
RSDETPS
T1
GND2
V
CC
2
T3
MIXADJ2
MIXPS
GND
V
CC
IFPS
IFIN
GND
MIXIN
MIXADJ1
T4
T5
V
CC
1
GND1
T6
FADJ1
SGND
BPFPS1
FADJ2
BPFPS2
SW(TACS/NTACS)
NC
BPFO
AUDIO
RSSI
GADJ(RSSI)
IF2
LIMPS
BIAS
LIM
DET
RSSI
AGC
BPF1
BPF0
1/2
OSC
PSN
PSN
RF AMP
MIXER
Note) Pins 21 and 25 are connected via the IC internal wiring.
Pins 12, 21 and Pins 25, 34 are connected via IC internal resistors.
When designing a PCB, ensure that all GND pins of IC are connected to the GND on PCB with its
connection wiring distance minimized.
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CXA1741Q
7
RSSI
1.2 V
8
GADJ
0.2 V
9
IF2
0.9 V
10
LIMPS
1.8 V
11
12
147
7
11
12
10
RSSI output. Outputs a
DC voltage in accordance
with the signal input to the
RF amplifier.
Adjusts the RSSI amplifier
gain (varies the resistance
so as to obtain a linear
RSSI output).
Limiter operation monitor.
Not used normally.
Connects a limiter
integrating capacitor.
Pin No.
Symbol
Pin voltage
I/O
Equivalent circuit
Description
DC
AC
resistance
8
7
147
147
147
11
12
9
--5--
CXA1741Q
11
V
CC
2
3.0 V
12
GND2
0 V
13
T1
14
RSDETPS 1.4 V
15
T2
16
RSSIPS
1.8 V
17
VREF
1.3 V
33
34
17
reference voltage
used in the
internal circuit
Power supply. Supplies
current to the LIM, DET,
and RSSI circuits.
Ground.
IC operation check.
Connects an RSSI detector
integrating capacitor.
IC operation check.
Connects an RSSI
integrating capacitor.
Monitor for the reference
voltage used in the internal
circuit.
When connected to an
external capacitor, this pin
also functions to lower the
reference voltage dynamic
impedance.
Pin No.
Symbol
Pin voltage
I/O
Equivalent circuit
Description
DC
AC
resistance
11
12
147
14
11
12
16
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