Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
200154A Skyworks Proprietary and Confidential information Products and Product Information are Subject to Change Without Notice February 16, 2005
1
PRODUCT SUMMARY
SKY74693: Receiver for CDMA, AMPS, PCS, and GPS Mobile
Handset Applications
Applications
Tri-band, tri-mode handsets
PCS and GPS phones
CDMA and GPS phones
Features
Two-step gain control, PCS LNA
Three-step gain control, cellular LNA
GPS LNA
External resistor to adjust LNA bias current
Independent AMPS, CDMA, PCS, and GPS mixers
Single LO input for CDMA, PCS, and GPS mixer
Buffered LO signal for transmit upconverter
Single external UHF VCO for PLL circuitry
VGA with 90 dB dynamic range
Integrated VHF oscillator and tank circuit
VCO_ON control for current optimization
Battery cell operation (2.7 V < VCC < 3.3 V)
RFLGATM package (48-pins, 7 x 7 x 1 mm) Pb-free (MSL3,
260
C per JEDEC J-STD-020) package with downset paddle
Skyworks offers lead (Pb)-free "environmentally
friendly" packaging that is RoHS compliant
(European Parliament for the Restriction of
Hazardous Substances).
Description
The SKY74693 is a highly integrated, single Intermediate
Frequency (IF) receiver intended for use in Code Division Multiple
Access (CDMA) phones operating in Personal Communications
System (PCS), cellular CDMA, Advanced Mobile Phone System
(AMPS), and Global Positioning System (GPS) modes. Skyworks
provides the following three product options:
SKY74693-12. Single-band, single-mode (CDMA).
SKY74693-13. Dual-band, single-mode (cellular CDMA and
PCS).
SKY74693-14. Tri-band, tri-mode (CDMA, AMPS, PCS, GPS).
Except for the Surface Acoustic Wave (SAW) filters, a UHF Voltage
Controlled Oscillator (VCO), and matching components, the device
incorporates everything required to implement the receiver chain,
from the Low-Noise Amplifier (LNA) to the In-Phase and
Quadrature (I/Q) demodulator stages. Three LNAs are in the front-
end receiver: a three-step gain stage cellular LNA (high, mid, and
bypass), a two-step gain stage PCS LNA (high, bypass), and a
high gain stage GPS LNA.
After RF LNA signal amplification and filtering from the antenna,
the received signal is mixed down from RF to the IF. There are
separate mixers for AMPS, CDMA-cellular, CDMA-PCS, and GPS
modes. To use a single IF frequency plan, the CDMA and PCS
mixer outputs have been combined. Therefore, both CDMA and
PCS bands use the same IF SAW filter. The AMPS differential
output can be combined externally to mate to a single-ended SAW
filter. The GPS mixer is an image-reject mixer, which eliminates
the need for an external RF SAW filter between the LNA and
mixer. The GPS image-reject mixer has a differential output for an
external L-C bandpass filter. After IF filtering, the IF signal is
amplified by a Variable Gain Amplifier (VGA) and fed to an I/Q
demodulator, resulting in baseband I/Q signals at the output.
The SKY74693 is also designed with a single Local Oscillator (LO)
input port for the AMPS/CDMA/PCS/GPS mixer. These mixers
operate at different RF frequency inputs, but have the same IF
frequency output. This usually refers to a single IF plan at
183.6 MHz. The LO_IN signal (pin 39) provides an LO port for the
CDMA/PCS/GPS mixers. In the cellular band, an internal divider
divides the frequency by two, which provides the LO input to the
cellular mixer. In the GPS band, the UHF LO frequency is 2/3 that
of the UHF VCO frequency. This allows only a single external VCO.
The UHF VCO is also buffered and amplified internally, which
provides the LO to drive the transmtiter upconverter LO port.
The VGA has a minimum dynamic range of 90 dB with a control
voltage range of 0.5 to 2.5 V, which is common to all modes. A
VHF oscillator operates with external tank circuits to provide LO
frequencies for the I/Q demodulator in the cellular, PCS, and GPS
modes. The noise figure, gain, and third order Input Intercept
Point (IIP3) of each stage in the receiver are optimized to meet the
system requirements for AMPS and CDMA modes according to
TIA/EIA-98-C. The design employs SiGe BiCMOS technology for
low cost, high performance, and a high level of integration.
A block diagram of the SKY74693 is shown in Figure 1.
PRODUCT SUMMARY SKY74693
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
2
February 16, 2005 Skyworks Proprietary and Confidential information Products and Product Information are Subject to Change Without Notice 200154A
PCS_LNA_OUT
CELL_LNA_OUT
GPS_LNA_VCC
PCS_MIX_IN
CELL_MIX_IN
LO_IN
x2
AFC
3
GPS_LNA_IN
VCO_TUNE
PLL
I+
I
Q+
Q
XTAL
AMPS_VGA_IN
PCS_LNA_IN
CELL_LNA_IN
S222
90
o
90
o
90
o
+
2
2
4
CDMA_VGA_IN+
GPS_VGA_IN
Cellular Mixer
AMPS, 800 MHz
Cellular Mixer
CDMA, 800 MHz
PCS Mixer
CDMA, 1800 MHz
Cellular LNA
CDMA/AMPS, 800 MHz
PCS LNA
CDMA, 1800 MHz
2
CDMA_VGA_IN
AMPS_IF+
LO_OUT
GPS_IF+
CELL_PCS_IF+
CELL_PCS_IF
GPS_IF
AMPS_IF
2
2
Figure 1. SKY74693 Receiver Block Diagram
Ordering Information
Model Name
Manufacturing Part Number
Product Revision
SKY74693 Receiver, Single-Band, Single-Mode (CDMA)
SKY74693 Receiver, Dual-Band, Single-Mode (CDMA and PCS)
SKY74693 Receiver, Tri-Band, Tri-Mode (CDMA, AMPS, PCS, and GPS)
SKY74693-12
SKY74693-13
SKY74693-14
Copyright 2005 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. ("Skyworks") products. These materials are provided by Skyworks as a service to its customers and may be
used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials. Skyworks may make changes to its documentation, products,
specifications and product descriptions at any time, without notice. Skyworks makes no commitment to update the information and shall have no responsibility whatsoever for conflicts,
incompatibilities, or other difficulties arising from future changes to its documentation, products, specifications and product descriptions.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by or under this document. Except as may be provided in Skyworks Terms and Conditions of
Sale for such products, Skyworks assumes no liability whatsoever in association with its documentation, products, specifications and product descriptions.
THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED OR OTHERWISE, RELATING TO SALE AND/OR USE OF SKYWORKS PRODUCTS
INCLUDING WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER
INTELLECTUAL PROPERTY RIGHT. SKYWORKS FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN
THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST
REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THESE MATERIALS WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications. Skyworks customers using or selling Skyworks products for use in such applications do so at their
own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale.
The following are trademarks of Skyworks Solutions, Inc.: Skyworks, the Skyworks logo, and Breakthrough Simplicity. Product names or services listed in this publication are for identification
purposes only, and may be trademarks of Skyworks or other third parties. Third-party brands and names are the property of their respective owners. Additional information, posted at
www.skyworksinc.com, is incorporated by reference.
PDF 
ZIP