SKY74702 Skyworks Solutions, SKY74702 Datasheet
SKY74702
Manufacturer Part Number
SKY74702
Description
Transmitter for CDMA Applications
Manufacturer
Skyworks Solutions
Datasheet
1.SKY74702.pdf
(2 pages)
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DataSheet
PRODUCT SUMMARY
SKY74702: Transmitter for CDMA Applications
Applications
• CDMA phones in the cellular band:
Features
• Serial bus interface control
• Low power consumption in all operating modes
• Image reject upconverter replaces external RF SAW filter
• Transmit power control with 90 dB dynamic range
• Variable gain RF block for improved in-band SNR
• VHF VCO (external tank), 200 to 700 MHz
• VHF VCO switching to increase the talk time of the radio
• Two separate PLL synthesizers provide dual-loop, multi-band
• Fully programmable PLL dividers and selectable charge pump
• Transmit puncture pin disables programmable portions of
• RFLGA™ (40-pin, 6 x 6 x 1 mm) package with downset paddle
Description
The SKY74702 device is a single-supply, monolithic integrated
circuit. It is designed for use in single-mode Code Division
Multiple Access (CDMA) cellular voice/data applications including
extensions for CDMA-Japan.
The SKY74702 is a highly integrated superheterodyne transmitter
that incorporates the following components:
• In-Phase and Quadrature (I/Q) modulator – accepts the analog I
• Voltage Controlled Oscillator (VCO) and VHF synthesizer –
• UHF synthesizer – controls the UHF oscillator
• Variable Gain Amplifier (VGA) – provides the variable output
• Image reject upconverter and power amplifier (PA) drivers
4
⎯ CDMA-US
⎯ CDMA-Japan
operation and power-save mode for both standby and lower
frequency of operation
currents for multi-VCO applications
device
and Q current outputs from the baseband analog processor and
converts them to Intermediate Frequency (IF) signals
generates the LO signal for the quadrature modulator
power for CDMA systems
U
.com
200030B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • January 31, 2005
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
DataSheet4U.com
The signal enters the chip as a baseband I/Q signal, which is
upconverted by an I/Q quadrature modulator. The resulting signal
is fed through a VGA to provide variable output power. After
leaving the open collector output of the VGA, the signal enters a
switch matrix. This switch matrix allows the signal to be routed
through an external filter, or it can be filtered by the tuned
collector load and passed directly to the UHF image reject mixer.
The image reject mixer is internally connected to the PA driver.
The mixer driver combination has a variable gain control that can
be used to reduce the RF gain, which improves the in-band
Signal-to-Noise Ratio (SNR) at a lower output power. The PA
driver amplifies the RF signal to the appropriate level for the
desired output power. This is then filtered by a bandpass filter
and sent to an external PA to obtain the final rated output power
at the antenna.
The device package and pinout for the 40-pin RF Land Grid Array
(RFLGA) are shown in Figure 1. A block diagram of the SKY74702
is shown in Figure 2.
VCC_IQ_MOD
VCO_TANK+
VCO_TANK–
POT_IREF
VCC_DIV
VCC_IF
IREF
Figure 1. SKY74702 Pinout – 40-Pin RFLGA Package
Q+
Q–
I+
I–
1
2
3
4
5
6
7
8
9
10
11
40
12
39
13
38
14
37
15
(Top View)
36
16
35
17
34
18
33
19
32
20
31
30
29
28
27
26
25
24
23
22
21
N/C
N/C
N/C
N/C
VCC_BIAS_DIFF_DRV
CDMA_DRV_OUT
VCC_CDMA_DRV
TX_PUNCTURE
DATA
LATCH_ENABLE
CLK
S304
1
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SKY74702 Summary of contents
Page 1
... This is then filtered by a bandpass filter and sent to an external PA to obtain the final rated output power at the antenna. The device package and pinout for the 40-pin RF Land Grid Array (RFLGA) are shown in Figure 1. A block diagram of the SKY74702 is shown in Figure 2. DataSheet4U.com 40 ...
Page 2
... January 31, 2005 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 200030B 4 DataSheet U .com I+ I– ÷2 ÷4 ÷2 VHF PLL UHF PLL ÷1 Figure 2. SKY74702 Transmitter Block Diagram DataSheet4U.com SKY74702-11 Mux CDMA_DRV_OUT POT_CELL Control Signal S305 Manufacturing Part Number Product Revision ...