鈥?/div>
WCDMA
The CX74040 Application-Specific Integrated Circuit (ASIC) is a
single supply, monolithic integrated circuit that incorporates all
the active functional blocks required for a transmitter. It is
designed for use in Wideband Code Division Multiple Access
(WCDMA) and Universal Mobile Telecommunication System
(UMTS) voice/data applications in the IMT-2000 frequency
band.
The highly integrated super-heterodyne transmitter comprises
all the critical components to implement the transmitter chain:
an In-Phase and Quadrature (I/Q) modulator that accepts the
analog I and Q outputs from the baseband processor and
converts them to Intermediate Frequency (IF) signals; a Voltage
Controlled Oscillator (VCO) and VHF synthesizer to generate the
Local Oscillator (LO) signal for the quadrature demodulators; a
UHF synthesizer to control the UHF oscillator; and a Variable
Gain Amplifier (VGA), which is required in CDMA systems to
provide a linear variable output power at the antenna.
The output of the VGA is fed to the upconverter with a provision
of Rx band filtering using a discrete IF filter. The output of the
upconverter is fed to the power amplifier pre-driver and filtered
using a bandpass filter. The output is sent to an external power
amplifier to obtain the rated final output power at the antenna.
The device package and pinout for the 40-pin RF Land Grid
Array (RFLGA鈩? device is shown in Figure 1. A block diagram
of the CX74040 is shown in Figure 2.
31
30
29
28
27
26
25
24
23
22
21
12
13
14
15
16
17
18
19
20
VGA_OUT+
VGA_OUT鈥?/div>
VCC_IF
POT_MIX
DRIVER_ON
IF_IN+
IF_IN鈥?/div>
POT_UHF_LO
VCC_MIXER2
VCC_MIXER1
VCC_BIAS_MIX
FEATURES
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Single battery cell operation (2.7 V < VCC < 3.3 V)
Low power consumption in all operating modes
Transmit power control with 90 dB dynamic range
Variable gain RF block to meet Signal-to-Noise Ratio (SNR)
100 to 1200 MHz oscillator (external tank)
VCO_ON feature to increase the talk time of the radio
Two separate Phase Lock Loop (PLL) synthesizers: dual-
loop multiband operation, power-save mode for both
standby and lower frequency of operation
鈥?/div>
Fully programmable PLL dividers, selectable charge-pump
currents for multi-VCO applications controlled via the Serial
Bus Interface
鈥?/div>
40-pin, 6 mm x 6 mm RFLGA package with downset paddle
VCC_IQ_MOD
VCO_TANK+
VCO_TANK鈥?/div>
40
39
38
37
36
35
34
33
VCC_DIFF_DRV
VCC_CLK
VCC_VHF
VHF_CP
REF
LD_OUT
UHF_CP
VCC_UHF_SYNTH
UHF_LO_SYNTH
POT_DRV
UHF_LO
VCC_UHF
1
2
3
4
5
6
7
8
9
10
11
RFGC
CLK
LATCH_ENABLE
SEC_DRV_OUT
DATA
VCC_BIAS_SEC_DRV
SEC_DRV_BYPASS
Figure 1. CX74040 Pinout 鈥?40-Pin LGA (Top View)
Skyworks Solutions, Inc. Proprietary and Confidential
103117A
[781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM
VCC_BIAS_DIFF_DRV
32
VGA_CTRL
VCC_DIV
Q+
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