sky74068-21 Skyworks Solutions, Inc., sky74068-21 Datasheet

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sky74068-21

Manufacturer Part Number
sky74068-21
Description
Sky74068-21 Dual-band Transmitter For Cdma And Pcs Femtocell Applications
Manufacturer
Skyworks Solutions, Inc.
Datasheet
DATA SHEET
SKY74068-21: Dual-Band Transmitter for CDMA and PCS
Femtocell Applications
Applications
 Dual-band femtocells
Features
 Low power consumption in all operating modes
 Direct upconversion architecture
 Device controlled using a three-wire read/write serial bus
 Baseband RC filter to reject receive band noise
 Fully integrated VCO with auto-tuning
 Dual-mode fractional-N/integer-N PLL
 Variable gain PA drivers
 Differential cellular driver output matched to 200 
 Single-ended PCS driver output matched to 50 
 Transmit power control with >75 dB dynamic range
 Low current consumption at low transmit power minimizes
 Hardware TX_ENABLE for gated mode operation
 RFLGA™ (32-pin, 5 x 5 x 1 mm) package with downset paddle
interface with independent supply voltage
current consumption and noise
(MSL3, 260 C per JEDEC J-STD-020)
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances) compliant packaging.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200761B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010
Description
The SKY74068-21 transmitter is a highly integrated device for
dual-band Code Division Multiple Access (CDMA) femtocells. The
SKY74068-21 supports femtocells in the cellular CDMA and
Personal Communications System (PCS) modes.
The device requires a minimum number of external components
to complete a CDMA radio subsystem. Included on-chip are the
baseband filter, direct upconversion In-Phase and Quadrature (I/Q)
mixers, variable gain power amplifier (PA) drivers, a fully
integrated Voltage Controlled Oscillator (VCO) with Local Oscillator
(LO) generation blocks, and a dual-mode fractional-N/integer-N
Phase Locked Loop (PLL).
External components needed for operation include bias resistors,
bypass capacitors, and passives to comprise the PLL loop filter.
The signal enters the chip as an analog baseband I/Q signal. It is
filtered by the baseband filter and upconverted to the desired RF
transmit frequency. The signal is amplified by one of two
upconverters, depending on whether the chip is operating in
cellular or PCS mode. The resulting signal is fed through the
appropriate PA driver stage to provide variable output power and
to drive the external PA. The signal is then filtered by an external
Surface Acoustic Wave (SAW) filter and sent to the PA to obtain
the final rated power.
The 32-pin RF Land Grid Array (RFLGA) device package and
pinout are shown in Figure 1. Figure 2 shows a functional block
diagram for the SKY74068-21.
1

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sky74068-21 Summary of contents

Page 1

... Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010 Description The SKY74068-21 transmitter is a highly integrated device for dual-band Code Division Multiple Access (CDMA) femtocells. The SKY74068-21 supports femtocells in the cellular CDMA and Personal Communications System (PCS) modes ...

Page 2

... DATA SHEET • SKY74068-21 CDMA TRANSMITTER VCC_PLL_1 VCC_PLL_2 VCO_EXT_RES VCO_BYPASS Figure 1. SKY74068-21 Transmitter Pinout – 32-Pin RFLGA ( mm) LD_OUT Fractional-N/ Integer-N PLL CP VCO_IO Integrated VCO Tank Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 2 August 2, 2010 • ...

Page 3

... Otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. The SKY74068-21 is rated to Moisture Sensitivity Level 3 (MSL3) at 260 C. It can be used for lead or lead-free soldering. For additional information, refer to the Skyworks Application Note, PCB Design & ...

Page 4

... DATA SHEET • SKY74068-21 CDMA TRANSMITTER Table 1. SKY74068-21 Signal Descriptions Pin # Name 1 LD_OUT Lock detect output. Open drain. 2 VCC_PLL_1 Supply for the PLL. 3 N/C No connection 4 CP Charge pump output. 5 VCC_PLL_2 Supply for the PLL. 6 VCO_IO Input/output port for the VCO bi- directional buffer ...

Page 5

... Z of logic control inputs IN Supply current: CDMA mode @ 5 dBm PCS mode @ 5 dBm Supply current in sleep mode Table 4. SKY74068-21 Electrical Specifications (Note +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted Parameter Baseband Filter Cutoff frequency Amplitude ripple Amplitude imbalance between I and Q ...

Page 6

... DATA SHEET • SKY74068-21 CDMA TRANSMITTER Table 4. SKY74068-21 Electrical Specifications (Note +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted Parameter I/Q RF Upconverter and Driver, CDMA (continued) Residual sideband suppression Carrier suppression (Note 2) Gain variation over the frequency band Output return loss @ maximum power ...

Page 7

... Table 4. SKY74068-21 Electrical Specifications (Note +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted Parameter I/Q RF Upconverter and Driver, PCS (continued) Supply current including LO chain: Current mode @ minimum power Current mode @ –30 dBm Current mode @ +9 dBm Supply current including LO chain: Voltage mode @ minimum power Voltage mode @ – ...

Page 8

... DATA SHEET • SKY74068-21 CDMA TRANSMITTER Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 8 August 2, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200761B GND GND ...

Page 9

... B C Pin 1 Indicator 5.04 0. Top View (2X R0.05) 0.38 ± 0.1 All measurements are in millimeters Dimensioning and tolerancing according to ASME Y14.5M-1994 Figure 4. SKY74068-21 32-Pin RFLGA Package Dimension Drawing 1.55 ± 0.05 0.30 ± 0.05 B Pin #1 Indicator Max. B 1.30 (Ko) B Notes: 1. Carrier tape: black conductive polystyrene 2. Cover tape material: transparent conductive PSA 3 ...

Page 10

... DATA SHEET • SKY74068-21 CDMA TRANSMITTER Ordering Information Model Name SKY74068-21 Transmitter Copyright © 2004, 2005, 2006, 2007, 2010 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer ...

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