SKY74067-21 SKYWORKS | Alldatasheet

Document overview

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Technical content

Features

  • Low power consumption in all operating modes
  • Direct upconversion architecture
  • Device controlled using a three-wire read/write serial bus interface with independent supply voltage
  • 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 Ω
  • Single-ended PCS driver output matched to 50 Ω
  • Transmit power control with >75 dB dynamic range
  • Low current consumption at low transmit power minimizes current consumption and noise
  • Hardware TX_ENABLE for gated mode operation
  • RFLGA™ (32-pin, 5 x 5 x 1 mm) Pb-free (MSL3, 260 °C per JEDEC J-STD-020) package with downset paddle Skyworks offers lead (Pb)-free, RoHS (Restriction of Hazardous Substances) compliant packaging.

Description

The SKY74067-21 transmitter is a highly integrated device for dual-band Code Division Multiple Access (CDMA) femtocell base station applications. The SKY74067-21 supports femtocells in the cellular CDMA and Personal Communications System (PCS) bands. The device requires a minimum number of external components to complete a CDMA2000 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 In-Phase and Quadrature (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 SKY74067-21.

DATA SHEET • SKY74067-21 CDMA2000 TRANSMITTER Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 200803A • Skyworks Proprietary and Confiden tial information • Products and Product Information are Subject to Change Without Notice • April 13, 2009 3 Technical Description Baseband Filter In voltage mode operation, the baseband section of the SKY74067-21 contains a simple RC filter to reject receive band noise from incoming I and Q signals. VCO, LO Chain, and PLL The VCO has an internal tank circuit automatically tuned to the desired frequency. The VCO is connected to an on-chip PLL and LO generation blocks. The output of the LO generation blocks drives the LO port of the I/Q RF upconverter. A dual-mode fractional-N/integer-N PLL is used to lock the VCO to the desired frequency in cellular mode. A bi-directional buffer is available to measure the VCO output or to enable use of an external LO for testing purposes. I/Q RF Upconverter The I/Q RF upconverter converts the incoming I/Q signal to the desired RF output signal. The upconverter passes the output signal directly to the variable gain PA drivers. The LO for the upconverter is provided by the VCO and LO generation blocks. The upconverter block consists of two separate mixers, one for cellular mode operation and the other for PCS mode. The output of the PCS mixer is routed to the PCS PA driver and the cellular mixer output is routed to the cellular PA driver. Variable Gain PA Drivers The SKY74067-21 includes two PA drivers. These drivers control the power level of the signal provided by the PCS and cellular upconverters. The gain of both drivers is variable, yielding over 75 dB of dynamic range. The PCS driver output is single-ended, while the cellular driver is differential. Both are open collector outputs that require external matching. Serial Bus Interface A three-wire serial bus with read/write capability provides mode and bias control, and control of the PLL. The serial interface consists of three signals: a bus clock (CLK), a bus enable (LATCH_ENABLE), and the serial, bi-directional data line (DATA). Package and Handling Information Since the device package is sensitive to moisture absorption, it is baked and vacuum packed before shipping. Instructions on the shipping container label regarding exposure to moisture after the container seal is broken must be followed. Otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. The SKY74067-21 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 & SMT Assembly/Rework Guidelines for RFLGA Packages, document number 103147. Care must be taken when attaching this product, whether it is done manually or in a production solder reflow environment. Production quantities of this product are shipped in a standard tape and reel format. For packaging details, refer to the Skyworks Application Note Tape and Reel, document number 101568. Electrical and Mechanical Specifications Signal pin assignments and functional pin descriptions are described in Table 1. The absolute maximum ratings of the SKY74067-21 are provided in Table 2. The recommended operating conditions are specified in Table 3 and electrical specifications are provided in Table 4. An application schematic diagram for the SKY74067-21 is shown in Figure 3. The package dimensions for the 32-pin RFLGA are shown in Figure 4, and the tape and reel dimensions are provided in Figure 5. Electrostatic Discharge (ESD) Sensitivity The SKY74067-21 is a static-sensitive electronic device. Do not operate or store near strong electrostatic fields. Take proper ESD precautions.

Table 1. SKY74067-21 Signal Descriptions 1 LD_OUT Lock detect output. Open drain. 17 VCC_RF_1 Supply for bias circuits of all drivers. 3 N/C No connection 19 CELL_OUT+ Positiv e cellular driver differential output. 4 CP Charge pump output. 20 CELL_OUT– Negative cellular driver differential output. 5 VCC_PLL_2 Supply for the PLL. 21 VCC_RF_2 Supply for PCS and cellular output drivers.

6 VCO_IO Input/output port for the VCO bi-

22 PCS_OUT PCS driver output. 10 VCC_VCO_CORE Supply for the VCO. 26 CS Current sink. 13 CLK Clock signal for serial bus. 29 I+ Positive in-phase analog baseband input. 14 LATCH_ENABLE Latch enable signal for serial bus . 30 I– Negative in-phase analog baseband input. 15 DATA Data signal for serial bus. 31 VCC_CLK Supply for the TCXO buffer. 16 GAIN_CTRL Gain control voltage. 32 REF TCXO input. Table 2. SKY74067-21 Absolute Maximum Ratings parameters set at or below their nominal value.

Table 3. SKY74067-21 Recommended Operating Conditions Table 4. SKY74067-21 Electrical Specifications (1 of 3)

1.98 MHz offset @ +0 dBm

Table 4. SKY74067-21 Electrical Specifications (2 of 3)

1.25 MHz offset @ +1 dBm

1.98 MHz offset @ +2 dBm

Table 4. SKY74067-21 Electrical Specifications (3 of 3) Note 1: Minimum of –20 dBc at minimum power.

Figure 3. SKY74067-21 Application Schematic

DATA SHEET • SKY74067-21 CDMA2000 TRANSMITTER Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 10 April 13, 2009 • Skyworks Proprietary a nd Confidential information • Products and Product Information are Subject to Change Without Notice • 200803A

Ordering Information

Model Name Manufacturing Part Numb er Evaluation Kit Part Number SKY74067-21 CDMA2000 Transmitter SKY74067- 21 (Pb-free package) TW17-D215-001 Copyright © 2009 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. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS 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 BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, 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, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. 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. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.