DATA SHEET SKY74068-21: Dual-Band Transmitter for CDMA and PCS Femtocell Applications Applications Description Dual-band femtocells 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. 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 Single-ended PCS driver output matched to 50 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) package with downset paddle (MSL3, 260 C per JEDEC J-STD-020) Skyworks offers lead (Pb)-free, RoHS (Restriction of Hazardous Substances) compliant packaging. 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200761B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010 1 REF VCC_CLK I– I+ Q– Q+ CS DATA SHEET • SKY74068-21 CDMA TRANSMITTER 32 31 30 29 28 27 26 VCC_RF_4 N/C 3 23 VCC_RF_3 CP 4 22 PCS_OUT VCC_PLL_2 5 21 VCC_RF_2 VCO_IO 6 20 CELL_OUT– VCO_TUNE 7 19 CELL_OUT+ VCO_EXT_RES 8 18 TX_ENABLE VCO_BYPASS 9 17 VCC_RF_1 10 11 12 13 14 15 16 GAIN_CTRL 24 DATA 2 CLK VCC_PLL_1 LATCH_ENABLE BIAS_RES VCC_INTERFACE 25 VCC_LD 1 VCC_VCO_CORE LD_OUT S1157 Q– Q+ I– I+ REF Figure 1. SKY74068-21 Transmitter Pinout – 32-Pin RFLGA (5 x 5 mm) (Top View) LD_OUT Fractional-N/ Integer-N PLL 0O CP PCS_OUT 90 O LO Generation VCO_IO 90O CELL_OUT– Serial I/O CELL_OUT+ 0O GAIN_CTRL DATA CLK LATCH_ENABLE Integrated VCO Tank S347 Figure 2. SKY74068-21 Transmitter Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 August 2, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200761B DATA SHEET • SKY74068-21 CDMA TRANSMITTER Technical Description Serial Bus Interface Baseband Filter 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). The SKY74068-21 has two modes of operation: current and voltage. In current mode, the device consists of a low resistive input. Together with an external capacitor across the differential inputs, the low resistive input acts as a low-pass filter. In voltage mode operation, the baseband section of the SKY74068-21 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 CDMA 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 SKY74068-21 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. 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 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 & 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. Electrical and Mechanical Specifications Signal pin assignments and functional pin descriptions are described in Table 1. The absolute maximum ratings of the SKY74068-21 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 SKY74068-21 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. The PCS driver output is single-ended, while the cellular driver is differential. Both are open collector outputs that require external matching. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200761B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010 3 DATA SHEET • SKY74068-21 CDMA TRANSMITTER Table 1. SKY74068-21 Signal Descriptions Pin # Name Description Pin # Name Description 1 LD_OUT Lock detect output. Open drain. 17 VCC_RF_1 Supply for bias circuits of all drivers. 2 VCC_PLL_1 Supply for the PLL. 18 TX_ENABLE Transmit enable/disable pin for all blocks, excluding VCO and PLLs. 3 N/C No connection 19 CELL_OUT+ Positive 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 bidirectional buffer. 22 PCS_OUT PCS driver output. 7 VCO_TUNE Loop filter input for the VCO. 23 VCC_RF_3 Supply for bias circuits of the PCS differential driver. 8 VCO_EXT_RES External bias-setting resistor for the VCO. 24 VCC_RF_4 Supply for the mixer and associated bias blocks. 9 VCO_BYPASS External capacitor for VCO noise filtering. 25 BIAS_RES External bias resistor for all blocks, excluding VCO. 10 VCC_VCO_CORE Supply for the VCO. 26 CS Current sink. 11 VCC_LO Supply for LO generation blocks. 27 Q+ Positive quadrature analog baseband input. 12 VCC_INTERFACE Supply for serial bus. 28 Q– Negative quadrature analog baseband input. 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. SKY74068-21 Absolute Maximum Ratings Maximum Units Supply voltage (VCC) Parameter –0.3 +3.6 V Input voltage range –0.3 VCC V Storage temperature –40 +125 C Ambient operating temperature –30 +85 C Note: Symbol Minimum Typical Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 August 2, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200761B DATA SHEET • SKY74068-21 CDMA TRANSMITTER Table 3. SKY74068-21 Recommended Operating Conditions Parameter Symbol Supply voltage Logic level: high low Minimum Typical Maximum Units 2.70 2.85 3.00 V VCC 0.5 V V VCC – 0.5 0 ZIN of logic control inputs 50 k Supply current: CDMA mode @ 5 dBm PCS mode @ 5 dBm 71 76 mA mA Supply current in sleep mode A 100 Table 4. SKY74068-21 Electrical Specifications (Note 1) (1 of 3) (TA = +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units Baseband Filter Cutoff frequency 3 MHz Amplitude ripple 0.5 Amplitude imbalance between I and Q chains 0.20 dB 0.25 dB Phase imbalance between I and Q chains 1 degrees Rejection: @ 45 MHz (CDMA) @ 80 MHz (PCS) 20 25 dB dB 1 Vp-p differential I/Q RF Upconverter, Voltage Mode Input signal level Input common mode voltage 1.3 Input impedance 1.5 1.9 V 50 k 1 0.6 mA I/Q Upconverter, Current Mode Input signal level Current sink 20 200 A 2.5 MHz I/Q RF Upconverter and Driver, CDMA I/Q frequency range 0.63 –1 dB bandwidth 5 RF output frequency range 800 Maximum RF output power 950 +5 Dynamic range 75 Control voltage range 0.2 Slope of RF AGC 30 ACPR: 750 kHz offset @ +4 dBm 1.98 MHz offset @ +0 dBm 836 MHz MHz dBm dB 50 2.7 V 75 dB/V –55 –70 dBc dBc Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200761B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010 5 DATA SHEET • SKY74068-21 CDMA TRANSMITTER Table 4. SKY74068-21 Electrical Specifications (Note 1) (2 of 3) (TA = +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units I/Q RF Upconverter and Driver, CDMA (continued) Residual sideband suppression –38 –35 dBc Carrier suppression (Note 2) –35 –32 dBc 0.5 1.0 dB Gain variation over the frequency band 824 MHz to 849 MHz Output return loss @ maximum power –12 –10 dB Receive band noise @ maximum gain, Po = +8 dBm –137 –135 dBm/Hz Noise floor @ minimum controlled output power = –81 dBm/1.23 MHz –165 –160 dBm/Hz Supply current including LO chain: Current mode @ minimum power Current mode @ –30 dBm Current mode @ +8 dBm 26 40 60 30 46 69 mA mA mA Supply current including LO chain: Voltage mode @ minimum power Voltage mode @ –20 dBm Voltage mode @ +8 dBm 22 35 60 25 40 69 mA mA mA Settling time for output power to reach 1 dB of final value s 5 I/Q RF Upconverter and Driver, PCS I/Q frequency range 0.63 –1 dB bandwidth 2.5 MHz 2000 MHz 5 RF output frequency range 1700 Maximum RF output power 1880 MHz +5 RF dynamic range 75 Control voltage range 0.2 Slope of RF AGC 30 dBm dB 50 2.7 V 80 dB/V ACPR: 885 kHz @ +1 dBm 1.25 MHz offset @ +1 dBm 1.98 MHz offset @ +2 dBm –52 –55 –70 Residual sideband suppression –35 –35 dBc Carrier suppression (Note 2) –35 –32 dBc Output return loss @ maximum power –12 –10 Receive band noise @ maximum gain, Po = +5 dBm –134 Noise floor @ minimum controlled output power = –79 dBm/1.23 MHz –165 dBc dBc dBc –160 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 dB dBm/Hz August 2, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200761B dBm/Hz DATA SHEET • SKY74068-21 CDMA TRANSMITTER Table 4. SKY74068-21 Electrical Specifications (Note 1) (3 of 3) (TA = +25 C, VCC = 2.85 V, CDMA2000 Waveform Used Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units Supply current including LO chain: Current mode @ minimum power Current mode @ –30 dBm Current mode @ +9 dBm 23 40 64 26 46 72 mA mA mA Supply current including LO chain: Voltage mode @ minimum power Voltage mode @ –30 dBm Voltage mode @ +5 dBm 19 40 66 23 46 76 mA mA mA I/Q RF Upconverter and Driver, PCS (continued) Settling time for output power to reach 1 dB of final value s 5 VCO/PLL in CDMA Mode Phase noise: @ 100 kHz offset @ 885 kHz offset @ 1.98 MHz offset –100 –120 –130 Total supply current –95 –110 –120 5.5 dBc/Hz dBc/Hz dBc/Hz mA Fractional-N PLL Reference range 1.0 Reference input sensitivity 19.2 40.0 MHz 200 500 Charge pump current, RF (sel 1) 0.032 0.040 0.048 mA Charge pump current, RF (sel 2) 0.08 0.10 0.12 mA Charge pump current, RF (sel 3) 0.16 0.20 0.24 mA Charge pump current, RF (sel 4) 0.32 0.40 0.48 mA 0.10 nA Charge pump leakage current PLL phase noise integrated from 1 kHz to 630 kHz at carrier: CDMA (Fcomp = 9.6 MHz) PCS (Fcomp = 9.6 MHz) mVp-p Unity gain loop bandwidth = 25 kHz Supply current 2 2 degrees rms degrees rms 4 mA Integer-N PLL Input frequency minimum range 500 Reference range 1.0 19.2 2500 MHz 40.0 MHz Phase detector frequency minimum range 10 Reference input sensitivity 200 500 Charge pump current, RF (sel 1) 0.22 0.28 0.34 mA Charge pump current, RF (sel 2) 0.56 0.70 0.84 mA Charge pump current, RF (sel 3) 1.12 1.40 1.68 mA Charge pump current, RF (sel 4) 2.24 2.80 3.36 mA Charge pump output voltage compliance, minimum range 0.5 VDD – 0.5 V Supply current 1000 kHz mVp-p 3.5 mA Note 1: Performance is guaranteed only under the conditions listed in this Table. Note 2: Minimum of –20 dBc at minimum power. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200761B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010 7 R1 5.1 Ω C1 1 nF C15 33 pF C22 470 pF R8 2.2 kΩ R6 1.5 kΩ C20 470 pF Note: Capacitors C8 and C9 are used only in the current operation mode. INTERFACE_VCC PLL_VCC PLL_VCC LD_OUT X R4 5.1 Ω R5 10 Ω C18 10 nF C12 1 nF × 9 8 7 6 5 4 3 2 1 C11 100 pF C14 1 nF C17 1 nF VCO_BYPASS VCO_EXT_RES VCO_TUNE VCO_IO VCC_PLL_2 CP N/C VCC_PLL_1 LD_OUT 32 11 REF VCC_VCO_CORE 10 31 30 29 28 12 13 14 27 15 SKY74068-21 VCC_CLK VCC_LD R20 10 kΩ DATA PLL_VCC I– VCC_INTERFACE C13 100 pF Q+ TCXO R3 10 Ω 26 16 VCC_RF_2 PCS_OUT VCC_RF_3 VCC_RF_4 BIAS_RES VCC_RF_1 TX_ENABLE CELL_OUT+ CELL_OUT– CS GAIN_CTRL TX_I– I+ CLK 17 18 19 20 21 22 23 24 25 R2 30 kΩ C4 33 pF C3 33 pF 1 L3 15 nH 4 6 L2 15 nH C10 0.33 μF C7 8.2 pF C2 8.2 pF L1 12 nH 2 4 Out In– In+ 3 C6 33 pF 1 5 2 3 C5 0.1 μF Out Cellular RF SAW In PCS RF SAW C8 330 pF GND GND Q– LATCH_ENABLE GND C9 330 pF GND 8 GND TX_I+ CLK LE DATA TX_AGC TX_VCC PA_ON TX_VCC S1158 CELL_OUT TX_VCC PCS_OUT TX_VCC CURRENT_SINK TX_Q+ TX_Q– DATA SHEET • SKY74068-21 CDMA TRANSMITTER Figure 3. SKY74068-21 Application Schematic Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com August 2, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200761B DATA SHEET • SKY74068-21 CDMA TRANSMITTER B 5.04 2.47 C Pin 1 Indicator Pin 1 Indicator 0.5 Pitch 5.04 32x SMT Pad 0.15 A B C 2.47 0.15 ∅2 ± 0.05 Solder Mask Opening 0.2 A B C A A 1 ± 0.1 A B C 0.1 Top View Side View Bottom View (2X R0.05) 0.38 ± 0.1 0.38 ± 0.1 0.05 0.3 ± 0.05 0.4 ± 0.05 Detail A SMT Pad Scale: 3X 7X This Rotation 7X Rotated 180° 9X Rotated 90° CW 9X Rotated 90° CCW All measurements are in millimeters Dimensioning and tolerancing according to ASME Y14.5M-1994 S1841 Figure 4. SKY74068-21 32-Pin RFLGA Package Dimension Drawing 8.00 (P1) 1.55 ± 0.05 4.00 (P0) 2.00 ± 0.05 0.30 ± 0.05 B 1.75 ± 0.10 5.35 (Bo) A 5o Max. 12.00 ± 0.30 A 5.50 ± 0.05 Pin #1 Indicator B 1.50 Min. 1.30 (Ko) 5.35 B 5o Max. Notes: 1. Carrier tape: black conductive polystyrene 2. Cover tape material: transparent conductive PSA 3. Cover tape size: 9.3 mm width 10 4. ESD surface resistivity is ≤1 x 10 Ohms/Square according to EIA, JEDIC TNR specification. 5. P0/P1 10 pitches cumulative tolerance on tape: ±0.20 mm 6. A and B measurement points are 0.30 mm from bottom pocket. 7. All dimensions are in millimeters A S461 Figure 5. SKY74068-21 Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200761B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 2, 2010 9 DATA SHEET • SKY74068-21 CDMA TRANSMITTER Ordering Information Model Name SKY74068-21 Transmitter Manufacturing Part Number SKY74068-21 Evaluation Board Part Number *** TBD *** Copyright © 2004, 2005, 2006, 2007, 2010 Skyworks Solutions, Inc. All Rights Reserved. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 August 2, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200761B