CX74037 Datasheet, PDF (1/11 Pages) Conexant Systems, Inc – Transmit RF IC for TDMA or AMPS Applications

CX74037
Transmit RF IC for TDMA or AMPS Applications
Conexant’s 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:
• 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).
The CX74037 48-pin, 7x7 LGA package pin configuration is shown in Figure 1. A
CX74037 block diagram is shown in Figure 2.
Features
• Sectional enable lines for independent control of
circuits within the chip
• 90 dB IF VGA range
• Separate IF frequencies can be used for the 800
MHz (AMPS) and 1900 MHz Bands (PCS)
• Dual drivers for 800 MHz and 1900 MHz
• PA driver is deactivated by using the Driver Enable
signal when there is no transmission
• Available in a 48-pin, 7x7 LGA package with
downset paddle
Applications
• Cellular and/or PCS-band phones
• TDMA and/or AMPS-mode phones
• Portable battery powered equipment
Data Sheet
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
37
48 47 46 45 44 43 42 41 40 39 38
2
36
3
35
4
34
5
33
6
32
7
31
8
30
9
29
10
28
11
27
12
26
14 15 16 17 18 19 20 21 22 23 24
13
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
Conexant Proprietary
Data Subject to Change
Doc. No. 101103A
September 27, 2000