PRELIMINARY DATA SHEET SKY73013-306: Direct Quadrature Demodulator 4.9–5.925 GHz Featuring “No-Pull” LO Architecture Functional Block Diagram Applications ● ● ● ● WiMAX, WLAN receivers UNII Band OFDM receivers RFID, DSRC applications Proprietary radio links Features ● ● ● ● ● ● ● ● ● RF is non-integer multiple of LO frequency Broadband RF: 4.9–5.925 GHz, LO: 3.268–3.952 GHz, IF: DC–100 MHz Single 3.3 V supply Very low LO drive level (-15 dBm) High dynamic range, low noise figure Excellent linearity and quadrature accuracy—suitable for 64-QAM OFDM Low current consumption Small 4 x 4 mm 16-lead QFN package Available lead (Pb)-free and RoHS-compliant Baseband Output I+ I- RF Input LNA x 3/2 Frequency Multiplier 2/3 FRF Local Oscillator Gain Control (on/off) Q+ Q- Baseband Output Description The Skyworks SKY73013-306 is an integrated receiver downconverter subsystem for the 4.9–5.925 GHz band. Its exceptional dynamic range and quadrature accuracy make this device an ideal solution for direct conversion and low-IF OFDM and singlecarrier communications systems (including 64-QAM WiMax and WLAN). The SKY73013-306 employs an innovative “no-pull” local oscillator (LO) architecture which offsets the required synthesizer frequency from that of the receiver center frequency by the non-integer factor of 3/2. This greatly improves the performance of direct conversion receiver architecture by eliminating dynamic DC offsets (caused by LO-RF leakage) and VCO pulling. This receiver frequency plan is compatible with the 3/2 “no-pull” modulator frequency plan. The SKY73013-306 contains a low noise amplifier at the RF input, the gain of which can be set to a high or low value via the gain control input. This LNA drives a highly linear quadrature mixer pair. The quadrature local oscillator signals to these mixer stages are provided by the 3/2 frequency conversion stage. The nominal supply voltage for SKY73013-306 is 3.3 V. This part can operate over the temperature range of -40 °C to 85 °C. An evaluation board is available upon request. NEW Skyworks offers lead (Pb)-free, RoHS (Restriction of Hazardous Substances)-compliant packaging. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200508 Rev. C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 1, 2008 1 PRELIMINARY DATA SHEET • SKY73013-306 Electrical Specifications VCC = 3.3 V, T = 25 °C, LO Input Power = -15 dBm, ZOUT = 1000 Ω Differential unless otherwise noted Parameter Condition Min. Typ. Max. 3 3.3 3.6 Unit DC Operating Conditions Supply voltage DC current 33 V mA RF Performance RF input frequency 4.9 5.925 GHz LO input frequency 3.268 3.952 GHz -10 dBm LO drive level -20 RF input impedance Differential LO input impedance Differential 100 100 IQ amplitude imbalance IQ phase error Noise figure -15 Direct conversion measurement (no image), LNA Gain control voltage = VCC Direct conversion measurement (no image), LNA Gain control voltage = 0 V 0.15 0.25 dB 2 3 Deg 6.0 8.5 dB 26 27 dB 26 4 dB dB Voltage conversion gain(1) LNA gain control voltage = VCC LNA gain control voltage = 0 V 22.5 0 24.5 2 Input 1 dB compression point LNA gain control voltage = VCC LNA gain control voltage = 0 V -17 -16 -15 -14 dBm dBm Input IP2 LNA gain control voltage = VCC LNA gain control voltage = 0 V 28 32 dBm dBm Input IP3 LNA gain control voltage = VCC LNA gain control voltage = 0 V 0 3 dBm dBm BB load impedance Differential IF output common mode voltage 500 || 15 1.55 IF DC offset IF output linear signal swing Ω || pF 1.65 1.75 V 10 20 mV Differential IF frequency range DC LO-to-RF isolation 2 Vpp 100 MHz 61 1. Voltage conversion gain = 20 log10 (VOUTrms/VINrms), independent of impedance. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 February 1, 2008 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200508 Rev. C dB PRELIMINARY DATA SHEET • SKY73013-306 Typical Performance Data VCC = 3.3 V, T = 25 °C, LO Input Power = -15 dBm, ZOUT = 1000 Ω Differential unless otherwise noted 30 30 25 20 Noise Figure (dB) Voltage Gain (dB) 25 LNA Gain Control = VCC 15 10 LNA Gain Control = 0 V 5 LNA Gain Control = 0 V 20 15 10 LNA Gain Control = VCC 0 5 -5 4600 4800 5000 5200 5400 5600 5800 4600 6000 5000 5200 5400 5600 5800 Frequency (MHz) Frequency (MHz) Voltage Conversion Gain vs. Frequency Noise Figure vs. Frequency 0.25 6000 3.0 LNA Gain Control = VCC Phase Error (Degrees) 0.20 I/Q Imbalance (dB) 4800 0.15 0.10 LNA Gain Control = 0 V 0.05 2.5 2.0 1.5 1.0 0.5 0 0 4600 4800 5000 5200 5400 5600 5800 6000 4600 4800 5000 5200 5400 5600 5800 Frequency (MHz) Frequency (MHz) I/Q Imbalance vs. Frequency Phase Error vs. Frequency 6000 -10 -11 IP1 dB (dBm) -12 LNA Gain Control = 0 V -13 -14 -15 -16 -17 LNA Gain Control = VCC -18 -19 -20 4600 4800 5000 5200 5400 5600 5800 6000 Frequency (MHz) Input 1 dB Compression Point vs. Frequency Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200508 Rev. C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 1, 2008 3 PRELIMINARY DATA SHEET • SKY73013-306 Pin Out Pin Descriptions RBIAS LNA+ LNAGND EN Gain C I- I+ 16 15 14 13 Pin # 12 N/C 1 11 LO- 2 10 LO+ 3 9 CTR2 4 5 6 7 8 VCC Q+ Q- CTR Evaluation Board Name Description 1 RBIAS Bias resistor. Nominal value = 1.2 k, 1% 2 LNA+ RF input + 3 LNA1 RF input - 4 GND Ground 5 VCC Supply voltage 6 Q+ BB/IF Q+ output 7 Q- BB/IF Q- output 8 CTR1 9 CTR2 Debug pin; connect to ground 10 LO+ Local oscillator input + Debug pin; connect to ground 11 LO- Local oscillator input - The SKY73013 Evaluation Board is used to test the performance of the SKY73013 Direct Quadrature Demodulator. The evaluation board BOM is as shown in the table below. 12 N/C No connection 13 I+ BB/IF I+ output 14 I- BB/IF I- output The evaluation board for SKY73013 allows the part to be fully exercised. The board is populated with several components which are not required for normal operation but facilitate special testing of the SKY73013, such as two high gain, differential baseband amplifiers which are well-suited for differential-tosingle-ended conversion, and are included for noise figure measurements. 15 GainC 16 EN Paddle Gain control; LNA is ON with VCC applied to this pin, off when grounded Chip enable; chip is enabled with VCC applied to this pin and disabled when this pin is grounded Must be connected via lowest possible impedance to ground for proper electrical and thermal performance The evaluation board requires a power supply voltage of 3.3 V nominal, that is capable of sourcing 50 mA. Absolute Maximum Ratings Characteristic Evaluation Circuit PCB RF Input Power VCC VGC (LNA On/Off) IF Outputs: [I-, I+, Q+, Q-] Supply voltage 4.5 V Supply current 60 mA LO input power LO+ RF+ Value 0 dBm 0 dBm Operating temperature -40 °C to +85 °C Storage temperature -65 °C to +85 °C Performance is guaranteed only under the conditions listed in the specifications table and is not guaranteed under the full range(s) described by the Absolute Maximum specifications. Exceeding any of the absolute maximum/minimum specifications may result in permanent damage to the device and will void the warranty. LO- RF- Op-Amp IF Outputs: [I-, I+, Q+, Q-] Op-Amp Power Header [+5 V, +1.5 V, GND, -5 V] High Gain Op-Amps to Observe very Small Signals on an Oscilloscope CAUTION: Although this device is designed to be as robust as possible, ESD (Electrostatic Discharge) 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 must be employed at all times. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 February 1, 2008 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200508 Rev. C PRELIMINARY DATA SHEET • SKY73013-306 Evaluation Circuit Schematic VGAIN CONTROL VCC VCC C25 Ground R5 C26 U2 AD8138ARM Ground H2 VP R7 Enable VOCM C23 C22 H1 } “I” R8 BB Out U1 R1 16 15 14 13 EN GainC I- I+ 1 R BIAS C1 VN } “Q” R9 N/C 12 C10 C2 RF Input + 2 LNA+ SKY73013 3 LNAC3 L8 LO Input + L6 LO Input - LO- 11 C4 RF Input - LO+ 10 4 GND VCC 5 Q+ 6 Q7 CTR2 CTR1 8 BB Out C8 9 C19 R3 L5 C27 H3 VCC C7 C6 VP C20 } “I” R2 BB Out VP VOCM VP VOCM VOCM R4 U3 AD8138ARM Ground VN VN H4 C30 } “Q” BB Out VN R6 C1, C3, C8, C10 not installed. Zero Ω resistors installed in positions L5, L6, and L8. U2, U3, and associated components are installed to facilitate noise figure measurements. Evaluation Board Test Procedure for Gain, Quadrature Accuracy, and Input Compression Use the following testing procedure to set up the SKY73013 evaluation board for testing. 1. Connect a 3.3 V DC power supply to VCC and either 3.3 V or 0 V to VGAIN CONTROL (for high or low gain). 2. Connect a 100 Ω balun (recommended: Krytar 4020080 180° Hybrid, with the Summing port terminated with 50 Ω) to the RF input input. Connect a vector signal generator to the input of the balun. Alternatively, at the expense of 3 dB signal loss, it is possible to drive the RF input single-ended with a 50 Ω source, as long as the opposite input is terminated with 50 Ω. Set this source to -20 dBm. 3. Connect a CW sine wave source, at 2/3 the RF frequency, to the LO. It is less critical to use a balun on this port, although it is still recommended. Set this source to -15 dBm . 4. Connect oscilloscope probes on the I+, I-, Q+ and Q- pins of header 1 5. Enable power supply. 6. Enable RF (set to CW) and LO power sources. 7. Observe quadrature amplitude balance and phase accuracy. 8. Adjust RF drive level to observe signal compression. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200508 Rev. C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 1, 2008 5 PRELIMINARY DATA SHEET • SKY73013-306 Evaluation Board Test Procedure for Evaluating Noise Floor Evaluation Board Components Component Description C1, C3, C8, C10, C12, C17 Do not place C2, C4 0.5 pF 1. Reduce the input RF level to -60 dBm C6 10 pF 0805 2. Connect 5 V to the 5 V pin on header 4 to power the differential amplifiers U2 and U3. C7 100 pF 0603 0402 This is procedure assumes that circuit is set up according to the procedure described above. 3. Move the Oscilloscope probes to the I+, I-, Q+ and Q- pins of header 3. The differential amplifiers are included in the signal path because the IF output signals directly from the I and Q baseband outputs of the SKY73013 are smaller than the minimum required by most oscilloscopes to make a reasonable measurement, although these signal levels are well within the dynamic range of almost any op amp or variable gain amplifier. 4. Adjust RF signal generator level until demodulated noise is approximately equal to that of the downconverted sinusoid output level. This input signal level corresponds to the inputreferred noise floor, the input level at which the output SNR is 0 dB. Circuit Design Considerations The following design considerations are general in nature and must be followed regardless of final use or configuration. Default 0201 C13, C14 2.7 pF C15, C18, C22, C24 1000 pF 0402 C19 5.1 pF 0402 C20 1 pF 0402 C21 0Ω 0402 C23 100 pF 0402 C25, C26, C27 5.1 pF 0201 C28, C29, C30 0.1 µF 0402 H1, H3 8-pin SMT header H2, H4 4-pin header L5, L6, L8 0Ω 0402 R1 1.2 k Ω 1% 0402 0402 R2 510 Ω R3, R5, R6, R9 39k Ω 0402 R4, R7, R8 510 Ω 0402 RFC1, RFC2, RFC3, RFC4 SMA connector U1 SKY73013 U2, U3 AD83138ARM 1. Paths to ground should be made as short as possible, with lowest possible impedance. 2. The ground pad of the SKY73013 direct quadrature demodulator has special electrical and thermal grounding requirements. This pad is the main thermal conduit for heat flow from the die to the circuit board. As such, design the printed circuit board ground pad to dissipate the maximum heat produced by the SKY73013 and ensure that the method used to electrically and mechanically connect the SKY73010 package to this ground pad is adequate to allow for this heat flow. 3. Two external bypass capacitors on the Vcc pin are recommended. One larger-value capacitor should be used for low frequency bypassing and the other, smaller value capacitor for high frequency bypassing. The smaller capacitor should be physically located as near as possible to the SKY73013 VCC pin. Special attention should be given to ensure that the selected smaller capacitor does not go into parallel self resonance at the RF frequency. QFN-16 (4 X 4mm) 0.157 (4.00 mm) 0.008 (0.20 mm) Seating Plane Pin 1 Indicator 0.157 (4.00 mm) 0.085 (2.15 mm) + 0.004 (0.10 mm) - 0.006 (0.15 mm) Exposed Pad 0.042 (1.075 mm) 0.0008 (0.02 mm) +0.001 (0.03 mm) -0.0008 (0.02 mm) 0.035 (0.90 mm) ± 0.004 (0.10 mm) 0.085 (2.15 mm) + 0.004 (0.10 mm) - 0.006 (0.15 mm) 0.077 (1.950 mm) 0.077 (1.950 mm) 4. The RF and LO inputs must be driven differentially for optimal performance. A 1:1 impedance balun is recommended for each with a center tap on the secondary side that is DC grounded. Special attention should be paid to ensure that the center tap has access to as “clean” a ground as possible. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 February 1, 2008 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200508 Rev. C PRELIMINARY DATA SHEET • SKY73013-306 Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 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. 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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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200508 Rev. C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 1, 2008 7