Linear Technology LTC5599 Demo Manual

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Description

–

DC2091 F01

DEMO MANUAL DC2091A

LTC5599

30MHz to 1300MHz Low Power

Direct Quadrature Modulator

Demonstration circuit 2091A is optimized for evaluation

of the LTC

5599 low power direct quadrature modulator.

The balanced I and Q baseband input ports can be either AC- or DC-coupled to a source with a common mode volt

age level of about 1.4V. Fixed LC networks on the LO and RF ports cover a continuous 90MHz to 1300MHz range. The SPI interface controls the supply current, modulator

MeasureMent setup

BB SIGNAL SOURCE

= 1.4VDC)

CMBB

gain, and allows optimization of the LO carrier feedthrough and side-band suppression.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2091A

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

–3dB

SPECTRUM

ANALYZER

Figure 1. Test Setup for RF Performance Measurements

–6dB

LO SIGNAL

SOURCE

– +

DC POWER SUPPLY

(3.3V)

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DEMO MANUAL DC2091A

absolute MaxiMuM input ratings

Supply Voltage ......................................................... 3.8V

Common Mode Level of BBPI, BBMI,

BPQ, BBMQ ...................................................2V

and

LOL, LOC DC Voltage ............................................. ± 0.1V

LOL, LOC Input Power .........................................20dBm

Voltage on Any Pin ...........................–0.3V to V

.................................................................... 150°C

JMAX

+ 0.3V

Case Operating Temper ature Range ....... –40°C to 105°C

Storage Temp erature Range .................. –65°C to 150°C

CAUTION: THIS PART IS SENSITIVE TO ELECTRO STATIC DISCHARGE (ESD). OBSERVE PROPER ESD PRECAUTIONS WHEN HANDLING THE LTC5599.

notes on test equipMent anD setup

• Use high performance signal generators with fully configurable differential I and Q outputs, such as the Rohde & Schwarz SMJ100A vector signal generator or equivalent.

• Use narrow resolution bandwidth (RBW) and engage video averaging on the spectrum analyzer to lower the displayed average noise level (DANL) in order to improve sensitivity and to increase dynamic range. The trade-off is increased sweep time.

• Spectrum analyzers can produce significant internal dis tortion products if analyzers are designed to operate at their best with about –30dBm to –40dBm at their input filter or preselector. Sufficient spectrum analyzer input attenuation should be used to avoid saturating the instrument, but too much attenuation reduces sensitivity and dynamic range.

they are overdriven. Generally, spectrum

• Before taking measurements, the system performance should be evaluated to ensure that:

1) clean input signals can be produced

2) the spectrum analyzer’s internal distortion is mini

3) the spectrum analyzer has enough dynamic range

4) the system is accurately calibrated for power and

• Digital modulation often requires DC coupling and flat frequency response. For best EVM performance with complex modulation, the RC networks at the baseband I/Q inputs are

mized

and sensitivity

frequency.

not required.

quick start proceDure

1. Remove the demonstration circuit from its protective packaging in an ESD-safe working area.

2. Turn off the DC power supply as well as the baseband and LO signal sources’ outputs.

3. Connect all test equipment as show in Figure 1.

4. Make sure jumper JP1 is installed and the jumper JP2 is installed at the 1-2 position.

5. Slowly increase the supply voltage to 3.3V. Do not exceed 3.8V.

6. Turn on the baseband signal source. Set the baseband common mode bias to 1.4V.

7. Verify the total V 28mA. The demonstration circuit is now turned on and is ready for measurements.

8. Turn on the output of the LO source and apply a

492.8MHz, 0dBm CW Signal.

9. Set the baseband signal source to provide a 100kHz, 200mV channels should be 90° shifted and set for lower sideband selection.

10. Measure the modulator’s RF output on the Spectrum Analyzer at 492.7MHz.

P-P(DIFF)

supply current is approximately

baseband input signal. The I and Q

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CTRL

GND

LOL

LOC

GND

TTCK

GND

SDO

SDI

SCLK

CSB

GNDRF

GND

BBMQ

BBPQ

BBMI

BBPI

TEMP

LTC5599IUF

1716J2J6J51514

543

0.01µF

L1, 39nH

C5, 15pF

0.1µF

R1, 1Ω

CTRL

TTCK

TEMP

BBMI

BBPI

GND

SDO

SDI

SCLKCSRF

3.3V

VCC

FB1

330Ω AT

100MHz

DC2091 F02

BBPQ

BBMQ

R12, OPT

R2, OPT

49.9Ω

0.1µF

R3, 0Ω

R4, 0Ω

R5, 0Ω

R6, 0Ω

4.7µF

C2, 1000pF

49.9Ω

0.1µF

R10

49.9Ω

0.1µF

R11

49.9Ω

0.1µF

* REMOVE THE RC NETWORK FOR BEST EVM WITH COMPLEX DIGITAL MODULATION.

quick start proceDure

DEMO MANUAL DC2091A

11. Calculate the Voltage Conversion Gain: =20•log (V

Gain

RF(OUT)(50Ω)

/ V

IN(DIFF)(I OR Q)

)

12. Measure the Output 1dB Compression Point by increas-

ing the

input signal level until the Voltage Conversion

Gain degrades by 1dB.

13.

Measure the Image Rejection at 492.9MHz.

14. Measure the LO Leakage at 492.8MHz.

DeMo boarD scheMatic

JP1

2 1

15. Connect the DC590B to the DC2091A with the ribbon cable provided. Make sure jumper JP6 on the DC590B is set to 3.3V.

16. Run QuikEval

to start the GUI associated with the

LTC5599.

17. The turn off procedure is the reverse of the turn on procedure. Make sure V

is removed after V

EN.

Figure 2. Low Power I/Q Modulator Schematic

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DEMO MANUAL DC2091A

ISO_7V_UNREG

ISO_5V_3

p3v_REG

ISO_CSb

ISO_SCK_SCL

ISO_SDA_MOSI

ISO_MISO

EE_V

EE_SDA

EE_SCL

EE_GND

GPI01

SCL

SDA

24LC025

VCC_B

DIR

VCC_A

GND

VCC_L

GND

VCC_L

GND

SDO

SDI

SCLK

DC2091 F03

DeMo boarD scheMatic

VCC_L

1 2 3

JP1

HD-2X7.0.79

VCC_L

R22

200k

NC7WZ17P6X

C15

0.1µF

R20

100Ω

74LVC1T45GW

R23

C11

0.1µF

C14

0.1µF

C10

2.2pF

C16

0.1µF

R19

R25

C12

2.2pF

R26

C13

2.2pF

C17

0.1µF

R18

4.99k

C18

2.2pF

ISO_GND

R13

R15

4.99k

R14

4.99k

Figure 3. Demo Board SPI Interface

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DEMO MANUAL DC2091A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., X5R, 4.7µF, 10%, 16V, 0603 MURATA, GRM188R61C475KAAJD

2 1 C2 CAP., C0G, 1000pF, 5%, 50V, 0402 MURATA, GRM1555C1H102JA01D

3 10 C3, C6–C9, C11, C14–C17 CAP., X7R, 0.1µF, 10%, 16V, 0402 MURATA, GRM155R71C104KA88D

4 1 C4 CAP., X7R, 0.01µF, 10%, 16V, 0402 MURATA, GRM155R71C103KA01D

5 1 C5 CAP., COG, 15pF, 5%, 50V, 0402 MURATA, GRM1555C1H150JA01D

6 4 C10, C12, C13, C18 CAP.,COG, 2.2pF,+/-.1pF, 25V, 0402 MURATA, GRM1555C1E2R2BZ01D

7 5 E1, E2, E3, E7, E8 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

8 3 E4, E5, E6 TESTPOINT, TURRET, .063" MILL-MAX, 2308-2-00-80-00-00-07-0

9 1 FB1 FERRITE BEAD, 33Ω @100MHz TDK, MPZ1608S331AT

10 1 JP1 HEADER, 2 PIN, 0.079 SINGLE ROW SULLINS, NRPN021PAEN-RC

11 1 JP2 HEADER, 3 PIN, 0.079 SINGLE ROW SULLINS, NRPN031PAEN-RC

12 2 XJP4, XJP5 SHUNT, 2mm Ctrs. SAMTEC, 2SN-BK-G

13 6 J1–J6 CONN., SMA, 50Ω, EDGE-LANCH E.F.JOHNSON, 142-0701-851

14 1 L1 IND., 39nH, 0402HP COILCRAFT, 0402HP-39NXJLU

15 1 P1 HEADER, 2X7PIN, 0.079CC MOLEX, 87831-1420

16 1 R1 RES., CHIP, 1Ω, 1%, 0402 VISHAY, CRCW04021R00FNED

17 0 R2, R12 OPT, 0402

18 4 R3, R4, R5, R6 RES., CHIP, 0Ω, 0402 VISHAY, CRCW04020000Z0ED

19 4 R8, R9, R10, R11 RES., CHIP, 49.9Ω, 1%, 0402 VISHAY, CRCW040249R9FKED

20 3 R13, R14, R15 RES., CHIP, 4.99K, 1%, 0402 VISHA

21 5 R18, R19, R23, R25, R26 RES., CHIP, 1K, 1%, 0402 VISHAY, CRCW04021K00FKED

22 1 R20 RES., CHIP, 100Ω, 1%, 0402 VISHAY, CRCW0402100RFKED

23 1 R22 RES., CHIP, 200K, 1%, 0402 VISHAY, CRCW0402200KFKEA

24 1 U1 IC., LTC5599, QFN-24-4X4 LINEAR TECHNOLOGY, LTC5599IUF#PBF

25 1 U2 IC, EEPROM 2KBIT 400KHZ 8TSSOP MICROCHIP TECH., 24LC025-I/ST

26 2 U3, U5 I.C., DUAL BUFFER SCHMT TRIG UHS SC706 FAIRCHILD SEMI., NC7WZ17P6X

27 1 U4 I.C., DUAL TRANSCEIVER 3ST 6TSSOP NXP, 74LVC 1T45GW,125

28 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT DC2091A

Y, CRCW04024K99FKED

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.

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DEMO MANUAL DC2091A

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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.

LT C 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 LT C application engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

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LT 1115 REV A • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 2014