CX74037
Transmit RF IC for TDMA or AMPS Applications
Conexant鈥檚 CX74037 Transmit RF Application-Specific Integrated Circuit (ASIC) is
a triple-mode, dual-band transmitter intended for use in IS-136 compliant cellular
phones. As a dual mode IC, it can be used in Time Division Multiple Access
(TDMA) mode or Advanced Mobile Phone System (AMPS) mode. The device is
available in a 48-pin 7x7 Land Grid Array (LGA) package with downset paddle.
The CX74037 RF IC device includes the following functional components:
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In-Phase and Quadrature (I/Q) modulator
Two Intermediate Frequency (IF) Voltage Controlled Oscillator (VCO) inputs
IF Variable Gain Amplifier (VGA)
Two upconverters
Two drivers for external Power Amplifiers (PAs).
Features
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Sectional enable lines for independent control of
circuits within the chip
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90 dB IF VGA range
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Separate IF frequencies can be used for the 800
MHz (AMPS) and 1900 MHz Bands (PCS)
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Dual drivers for 800 MHz and 1900 MHz
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PA driver is deactivated by using the Driver Enable
signal when there is no transmission
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Available in a 48-pin, 7x7 LGA package with
downset paddle
Applications
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Cellular and/or PCS-band phones
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TDMA and/or AMPS-mode phones
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Portable battery powered equipment
The CX74037 48-pin, 7x7 LGA package pin configuration is shown in Figure 1. A
CX74037 block diagram is shown in Figure 2.
IF_VCO_IN2+
IF_VCO_IN2-
LO_PCS_IN
IF_SELECT
VCC_MIX
LO_CELL
VGA_EN
MODE
NC
NC
MIX_IN+
MIX_IN-
VCC_IF
VGA_GC
VGA_OUT-
VGA_OUT+
VCC_LD_PCS
POT_CELL
DRV_ENA
RF_PCS_OUT
VCC_BIAS
RF_CELL_OUT
BAND
1
2
3
4
5
6
7
8
9
10
11
12
13
VCC_DRV_CEL
VCC_MID_PCS
VCC_MOD
DRV_PCS_IN
POT_PCS
I_DATA+
DRV_CELL_IN
Q_DATA+
I_DATA-
Q_DATA-
NC
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
NC
37
36
35
34
33
32
31
30
29
28
27
26
25
NC
IF_VCO_IN1-
IF_VCO_IN1+
NC
NC
NC
VCC_DIV
MIX_CELL_OUT
PULL_ENA
VCC_DIFF_DRV
MIX_PCS_OUT
NC
NC
101103A-1_080400
Figure 1. CX74037 48-Pin, 7x7 LGA Package Pin Configuration
Data Sheet
Conexant Proprietary
Data Subject to Change
Doc. No. 101103A
September 27, 2000
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