CX74036
IS-136 Receive RF IC for TDMA and AMPS Applications
Conexant鈥檚 CX74036 receive RF IC is an advanced, highly integrated and high
performance, triple-mode, dual-band IC for IS-136 compliant cellular radio
applications and is designed in an advanced 28 GHz Ft BiCMOS process. In the
800 MHz cellular band, the CX74036 is designed to operate in both the Time
Division Multiple Access (TDMA) mode and Advanced Mobile Phone System
(AMPS) mode. In the 1900 MHz Personal Communications System (PCS) band,
the device operates in the TDMA mode.
The CX74036 embodies all the necessary functions for a radio receiver system
except for the RF and Intermediate Frequency (IF) filters and RF Local Oscillator
(LO) sources. The device front-end section has two Low Noise Amplifier (LNA) and
mixer pairs, one for the 800 MHz band and the other for the 1900 MHz band. A
common path is taken from the first IF mixer output to the demodulator output.
The CX74036 48-pin, 7x7 Land Grid Array (LGA) package pin configuration is
shown in Figure 1. A block diagram of the CX74036 is shown in Figure 2.
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Front-end to baseband in one IC
Inphase and Quadrature (I/Q) demodulator
3 V supply operation
Low current consumption
LNA gain switch with current reduction
IF LO synthesizer with Voltage Controlled
Oscillator (VCO) (requires external tank)
鈥?/div>
70 dB Variable Gain Amplifier (VGA) dynamic
range
鈥?/div>
Low Noise Figure (NF) and high 3rd order Input
Intercept Point (IIP3) mixers
Applications
鈥?/div>
Cellular and/or PCS band phones
鈥?/div>
TDMA and/or AMPS mode phones
鈥?/div>
Portable battery powered radio equipment
VCC2_LNAH
VCC2_LNAL
VCC1_LNA
LNA_INH
LNA_INL
LNA_O H
LNA_O L
EXT_LO
39
LNA_G
MXIH
MIXIL
BAND
CHIP_EN
LO IH
LO IL
VCC_MX
STANDBY
IQ /IF
MXO UT+
MXO UT-
MX2I+
1
2
3
4
5
6
7
8
9
10
11
12
13
48
47
46
45
44
43
42
41
40
38
IF_O +
NC2
NC1
37
36
35
34
33
32
31
30
29
28
27
26
IF_O -
Q-
Q+
I-
I+
EXT_LO IN
VCC_VCO
VCO -
VCO +
VCC_SYN
LP_FIL
REFIN
DATA
14
15
16
17
18
19
20
21
22
23
24
25
MX2I-
VG AI-
IFBYPASS
VG AI+
Vvga
FB_CAP
VCC_VG A
MX2O UT
VCC_IF
LATCH_EN
CLK
101105A-1_082500
Figure 1. CX74036 48-Pin, 7x7 LGA Package Pin Configuration
Data Sheet
Conexant 鈥?Proprietary
Data Subject to Change
Doc. No. 101105A
October 17, 2000
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CONEXANT
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