DEMO MANUAL DC2391A LTC5589 700MHz to 6000MHz LOW POWER I/Q MODULATOR ABSOLUTE MAX INPUT RATINGS DESCRIPTION Supply Voltage:...................................................... +3.8V Common Mode Level of BBPI, BBMI, BBPQ, and BBMQ:............................ +2V LOL, LOC DC Voltage:..........................................±50mV LOL, LOC Input Power:...................................... +20dBm TEMP, SDO Current Sink........................................ 10mA Voltage on Any Pin Not to Exceed...................................–0.3V to (VCC +0.3V) TJMAX.....................................................................150°C Operating Temperature Range............... –40°C to 105°C Storage Temperature Range.................. –65°C to 150°C Demonstration circuit 2391A is optimized for evaluation of the LTC®5589 low power I/Q modulator up to 4.5GHz. For frequencies above 4.5GHz, LO matching circuit on the DC2391A demo board can be easily modified for improved image rejection performance. Refer to data sheet for additional information. The four balanced I- and Q-baseband input ports can be either AC-coupled with internal bias supplied, or DC-coupled from a source with a common-mode voltage level of about +1.4V. The SPI interface is used to set internal registers which control the gain, optimum center frequency, I-offset, Q-offset and sideband suppression. In addition to the digital gain control with 1dB steps, there is an analog gain control, VCTRL. An on‑chip thermometer can be used to compensate for the gain vs temperature variations using a digital gain control change. The update can either be automatically triggered, or entirely switched off. CAUTION: This part is sensitive to electrostatic discharge (ESD). Observe proper ESD precautions when handling the LTC5589. Design files for this circuit board are available at http://www.linear.com/demo/DC2391A L, LT, LTC, LTM, Linear Technology , the Linear logo and Linduino are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TEST SETUP IQ BASEBAND GENERATOR SPECTRUM ANALYZER OR VSA LO SIGNAL GENERATOR IQ INPUTS DVM PC Linduino® ONE DC2026C RF LTC5589 ON DC2391A GND SPI USB SERIAL CONTROLLER USB USB LO 2560MHz, 0dBm NOM. +3.3V EN + – SPI + – POWER SUPPLY +3.3V RIBBON CABLE DC2391A F01 Figure 1: Test Setup for RF Performance Measurements dc2391af 1 DEMO MANUAL DC2391A NOTES ON TEST EQUIPMENT AND SETUP • Use a high performance baseband signal generator with differential outputs, such as the Rohde & Schwarz SMJ100A vector signal generator or equivalent. • The LO harmonics can degrade image rejection severely. Third harmonic should be kept at least 6dB lower than the desired image rejection, or it should be compensated by adjusting the quadrature phase balance, register 0x05. In the extreme case of nearly square wave LO drive, large offset values may be required for registers 0x04 and 0x05. • Use narrow resolution bandwidth (RBW) and engage video averaging on the spectrum analyzer to lower the displayed average noise level (DANL). The tradeoff is increased sweep time. • Spectrum analyzers can produce significant internal distortion products if overdriven. Generally, spectrum analyzers are designed to operate their best with about –30 to –40dBm at their 1st mixer. Sufficient spectrum analyzer input attenuation should be used to avoid overdrive, but too much attenuation reduces sensitivity and dynamic range. • Before taking measurements, the system performance should be evaluated to ensure that: 1) clean baseband signals can be produced, 2) the LO harmonics and phase noise are minimized for CW LO drive, 3) the spectrum analyzer’s internal distortion is minimized, and noise floor is satisfactory. QUICK START PROCEDURE 1. Remove the DC2391A from its protective packaging in an ESD-safe working area (see Figure 1). Make sure jumper JP1 is installed (VCTRL = VCC). 2. Set the baseband signal generator output DC commonmode voltage to +1.4VDC, set the amplitude (Vemf) = 1V diff, but do not yet connect the 4 cables to the DC2391A. 3. Connect the DC power supply and increase voltage to +3.3V. Using a voltmeter, verify the voltage at the LTC5589 VCC pin or JP1 is +3.3V. Adjust if necessary. 4.Apply 3.3V to DC2391A’s enable input (EN).The enable voltage must never exceed the LTC5589’s VCC supply voltage by 0.3V or drop below –0.3V. 5. Verify the total VCC supply current is approximately 29mA. 6. Connect the RF output to the spectrum analyzer. 7. Connect the LO source to the LO input and apply a 2560MHz, 0dBm CW LO signal. 8. Configure the baseband signal source to provide a single CW carrier with 100kHz offset. I- and Q-channels should be in phase-quadrature and set for lower sideband selection. 2 9. Observe the modulator’s RF output on the spectrum analyzer at 2559.9MHz. Also observe the sideband suppression (aka Image Rejection) at 2560.1MHz, and the LO Leakage at 2560MHz. 10. Up to this point, the I/Q Modulator has been at default center frequency and gain, with no trims. To change modulator center frequency, gain, etc., connect the Linduino to the DC2391A with the ribbon cable provided. Make sure jumper JP3 on the DC2026C is set to 3.3V. 11. Run QuikEval™ to start the GUI associated with the I/Q modulator. 12. Be sure to update the QuikEval to get latest software version that supports the LTC5589. LTC5589 GUI will automatically be installed on the computer for the first time when DC2391A is connected to Linduino DC2026C. 13. The turn off procedure is the reverse of the turn on procedure: Make sure VEN is removed before VCC. dc2391af DEMO MANUAL DC2391A QuikEval SOFTWARE Figure 2: QuikEval Screen QuikEval Usage Notes 1.The LTC5589 QuikEval is a modified version of the LTC5599 QuikEval program. The Windows Start Menu for LTC5589 will say LTC5599 LTC5589. That’s OK. The correct form will be automatically loaded. 6. In end applications, Linduino C code is available to help user get from engineering units (MHz, dB gain, mV, dB and degrees imbalance) to register values, and vice versa. 2. The status box at the right shows activity, and should show Connected. Begin by clicking “Reset”. Red font notification occurs if anything wrong. If SPI connection is lost, simply click “Connect” near top right corner. 7.The LTC5589 registers reset to default while starting QuikEval GUI, which defaults CLOEN bit (bit 4, register 0x06) to 1. This allows for the automatic adjustment of the LO match. For large phase adjustments, the I/Q phase extension bits are changed from default, and it is recommended to let GUI find the best C_LO values (check box in GUI) in order to avoid phase discontinuities during I/Q phase extension bits changes. In that case, the CLOEN bit is cleared and CLOO override bits in register 0x06 are used to keep the LO match the same while the polyphase filter center frequency is adjusted in order to maintain a smooth phase adjustment during the I/Q phase extension bits changes. For more information, refer to the LTC5589 data sheet. 3. When a new LO frequency is entered in the top left corner of the form, followed by Enter key, the software calculates a new register 0x00 value, shows it, loads it, and reads back to verify. 4. Gain is easily modified here. DC current consumption automatically scales with gain changes (lower RF output power permits lower DC current). 5. If desired, I and Q DC offsets can be trimmed out, as can SSB suppression, via the controls on left side of form. dc2391af 3 DEMO MANUAL DC2391A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 1 C1 CAP., X5R, 4.7µF, 10%, 16V, 0603 MURATA, GRM188R61C475KAAJD 2 2 C2, C14 CAP., C0G, 1000pF, 5%, 50V, 0402 MURATA, GRM1555C1H102JA01D 3 3 C3, C15, C16 CAP., X7R, 0.1µF, 10%, 16V, 0402 MURATA, GRM155R71C104KA88D 4 1 C4 CAP., C0G, 100pF, 5%, 25V, 0402 MURATA, GRM1555C1E101JA01D 5 1 C5 CAP, C0G, 2pF, ±0.05pF, 50V, 0402 MURATA, GJM1555C1H2R0WB01D 6 0 R2, C6, C7, R8, C8, R9, C9, R10, R11, R12, R24, R25, R26, R27 OPT, OPT 7 4 C10, C11, C12, C13 CAP., COG, 2.2pF, ±0.1pF, 25V, 0402 MURATA, GRM1555C1E2R2BZ01D 8 2 C17, C18 CAP, C0G, 0.2pF, ±0.05pF, 50V, 0402 MURATA, GRM1555C1HR20WA01D 9 5 E1, E2, E3, E7, E9 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 10 4 E4, E5, E6, E10 TESTPOINT, TURRET, 0.063" MILL-MAX, 2308-2-00-80-00-00-07-0 11 1 FB1 FERRITE BEAD, 330Ω @100MHz TDK, MPZ1608S331AT00 12 1 JP1 HEADER, 2-PIN 0.079 SINGLE ROW SULLINS, NRPN021PAEN-RC 13 1 XJP5 SHUNT, 2mm CTRS. SAMTEC, 2SN-BK-G 14 6 J1-J6 CONN., SMA, 50Ω, EDGE-LANCH E. F. JOHNSON, 142-0701-851 15 0 J7, J8 CON., OPT 16 1 L1 IND.,4.7nH, 0402HP COILCRAFT, 0402HP-4N7XJLU 17 1 P1 HEADER, 2X7PIN, 0.079CC MOLEX, 87831-1420 18 1 R1 RES., CHIP, 1, 1%, 0402 VISHAY, CRCW04021R00FKED 19 6 R7, R16, R17, R18, R19, R22 RES., CHIP, 1k, 1%, 0402 VISHAY, CRCW04021K00FKED 20 3 R13, R14, R15 RES., CHIP, 4.99k, 1%, 0402 VISHAY, CRCW04024K99FKED 21 1 R20 RES., CHIP, 0Ω, 0402 VISHAY, CRCW04020000Z0ED 22 1 R21 RES., CHIP, 10Ω, 1%, 0402 VISHAY, CRCW040210R0FKED 23 1 R23 RES., CHIP, 200k, 1%, 0402 VISHAY, CRCW0402200KFKED 24 1 R28 RES., CHIP, 100k, 1%, 0402 VISHAY, CRCW0402100KFKED 25 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2391A 26 1 U1 IC., LOW POWER DIRECT QUADRATURE MODULATOR, QFN-24-4X4 LINEAR TECH., LTC5589IUF#PBF 27 1 U2 IC, EEPROM 2-KBIT 400kHz 8TSSOP MICROCHIP TECH., 24LC025-I/ST 28 2 STENCIL (TOP AND BOTTOM) STENCIL DC2391A 29 1 CABLE ASSY., 8 STRIP LINEAR RIBBON CABLE ; 4 dc2391af Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C E9 E7 J3 J4 E6 J8 J7 E3 E2 LO R25 OPT C18 0.2pF TTCK E5 R27 OPT J1 VCTRL R26 OPT R24 OPT C1 4.7uF E4 C6 OPT R8 OPT R2 5 OPT R28 100K R19 1K C5 2pF C7 OPT R9 OPT 1nF TTCK GND LOC LOL GND VCTRL C14 1nF 6 5 4 3 2 1 C2 VCC C3 100nF L1 4.7nH R1 1 JP1 1. ALL RESISTORS ARE IN OHMS, 0402 2. ALL CAPACITORS ARE 0402 NOTE: UNLESS OTHERWISE SPECIFIED GND GND BBPI BBMI TEMP TEST TEST EN GND E1 1 2 D 25 FB1 330 Ohm @100 MHz 4 24 GND 23 VCC TEMP 4 7 20 U1 LTC5589IUF SD0 22 EN BBPI 8 19 GNDRF GNDRF GNDRF RF GNDRF GNDRF CSB 21 BBMI 9 C4 1K C9 OPT R11 OPT C17 0.2pF R20 C15 100nF R21 10 100pF R12 OPT C8 OPT R10 OPT 13 14 15 16 17 18 R22 3 0 3 RF BBPQ BBMQ C11 2.2pF TP4 SCLK 4 3 2 1 TP5 CSB C12 2.2pF THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE J5 J6 C10 2.2pF TP3 SDI SDA VSS 5 6 7 8 APPROVALS SCL A2 VCC C16 0.1uF U2 A1 WP 24LC025 A0 C13 2.2pF R18 1K 2 SCALE = NONE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. AK VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. ANDY M. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. J2 TP2 SDO 2 R14 4.99K R7 TP6 SDA 1K E10 14 12 11 9 10 5 7 4 6 2 1 GPIO1 EE_GND EE_SCL EE_SDA EE_VCC ISO_MISO P1 ISO_SDA_MOSI ISO_SCK_SCL ISO_CSb ISO_5V_3p3v_REG ISO_7V_UNREG HD-2X7.0.79 APPROVED DATE ANDY M. 01-07-16 DATE: SIZE Thursday, January 07, 2016 1 OF 1 LOW POWER I/Q MODULATOR 0.7GHz - 3.8GHz IC NO. REV. LTC5589IUF N/A 3 DEMO CIRCUIT 2391A SHEET 1 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only EE_GND TP7 SCL DESCRIPTION 3RD PROTO TECHNOLOGY R15 4.99K R16 1K R23 200K ISO-3.3V REV 3 TITLE: SCHEMATIC R13 4.99K R17 1K __ ECO 1 REVISION HISTORY ISO_GND 3 SDI BBPQ 10 ISO_GND 8 SCLK BBMQ 11 GND 12 ISO_GND 13 VCC 2.7V - 3.6V 5 A B C D DEMO MANUAL DC2391A SCHEMATIC DIAGRAM dc2391af 5 DEMO MANUAL DC2391A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 6 dc2391af Linear Technology Corporation LT 0616 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016