DC2391A

DC2391A AD | Alldatasheet

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DESCRIPTION

Demonstration circuit 2391A is optimized for evaluation of the LT C®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, V CTRL. 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. L, L T , L TC, L TM, 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. Design files for this circuit board are available at http://www.linear .com/demo/DC2391A Figure 1: Test Setup for RF Performance Measurements TEST SETUP SPECTRUM ANAL YZER OR VSA IQ BASEBAND GENERATOR LO SIGNAL GENERATOR DVM POWER SUPPL Y +3.3V IQ INPUTS L TC5589 ON DC2391A RF LO GND SPI EN+3.3V 2560MHz, 0dBm NOM. Linduino® ONE DC2026C USB SERIAL CONTROLLER USB SPI PC USB RIBBON CABLE DC2391A F01 ABSOLUTE MAX INPUT RATINGS Common Mode Level of Voltage on Any Pin Not CAUTION: This part is sensitive to electrostatic discharge (ESD). Observe proper ESD precautions when handling the LTC5589.

NOTES ON TEST EQUIPMENT AND SETUP QUICK START PROCEDURE

• Use a high performance baseband signal genera - tor with differential outputs, such as the Rohde & Schwarz SM J100A 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 trade- off 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. 1. Remove the DC2391A from its protective packaging in an ESD-safe working area (see Figure 1). Make sure jumper JP1 is installed (V CTRL = VCC). 2. Set the baseband signal generator output DC common- mode 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 V CC pin or JP1 is +3.3V. Adjust if necessary. 4. A pply 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 V CC 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 side- band selection. 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 pro- vided. 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 V EN is removed before VCC.

Figure 2: QuikEval Screen QuikEval SOFTWARE 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. 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 . 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. 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. 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 discontinui- ties 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 adjust- ment during the I/Q phase extension bits changes. For more information, refer to the LTC5589 data sheet.

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 ; PARTS LIST

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. SCHEMATIC DIAGRAM D D C C B B A A 1. ALL RESISTORS ARE IN OHMS, 0402 2. ALL CAPACITORS ARE 0402 NOTE: UNLESS OTHERWISE SPECIFIED EE_GND VCC SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 07, 2016 11 LOW POWER I/Q MODULATOR 0.7GHz - 3.8GHz AK ANDY M. N/A LTC5589IUF DEMO CIRCUIT 2391A SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 07, 2016 11 LOW POWER I/Q MODULATOR 0.7GHz - 3.8GHz AK ANDY M. N/A LTC5589IUF DEMO CIRCUIT 2391A SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 07, 2016 11 LOW POWER I/Q MODULATOR 0.7GHz - 3.8GHz AK ANDY M. N/A LTC5589IUF DEMO CIRCUIT 2391A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV ANDY M.3RD PROTO3 01-07-16__ DESCRIPTION DATEAPPROVEDECO REV ANDY M.3RD PROTO3 01-07-16__ DESCRIPTION DATEAPPROVEDECO REV ANDY M.3RD PROTO3 01-07-16__ C17 0.2pF C2 1nF LO C12 2.2pF HD-2X7.0.79 ISO_7V_UNREG1 ISO_5V_3p3v_REG2 ISO_CSb6 EE_GND12 EE_SCL11 EE_SDA9 ISO_SCK_SCL4 ISO_SDA_MOSI7 GPIO114 ISO_GND3 ISO_MISO5 ISO_GND8 EE_VCC10 ISO_GND13 R21 10 OPT TP6 SDA R18 1K 100nF C5 2pF VCTRL R24 OPT BBMQ FB1

330 Ohm @100 MHz

4.99K OPT R28 100K TEST R1 1 RF BBPQ R27 OPT R14 4.99K L1 4.7nH TEST R11 OPT OPT R26 OPT OPT E9GND BBMI R12 OPT TTCK R20 0 C16 0.1uF C15 100nF TEMP TP7 SCL TP5 CSB C11 2.2pF R23 200K R2 OPT 24LC025 A01 A12 A23 VSS4 SDA 5 SCL 6 WP 7 VCC 8 E10 ISO-3.3V E3EN OPT R17 1K C13 2.2pF 4.7uF R19 1K E2GND BBPI OPT JP1 1 2 TP3 SDI VCC 2.7V - 3.6V R15 4.99K R22 1K R25 OPT E7GND C10 2.2pF LTC5589IUF VCTRL1 GND2 LOL3 LOC4 GND5 TTCK6 TEMP7 BBPI8 BBMI9 BBPQ10 BBMQ11 GND 12 GNDRF 13 GNDRF 14 GNDRF 15 RF 16 GNDRF 17 GNDRF 18 CSB19 SCLK20 SDI21 SD022 EN23 VCC24 GND25 R10 OPT C4 100pF C14 1nF C18 0.2pF

DEMO MANUAL DC2391A Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2016 LT 0616 • PRINTED IN USA 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