Linear Technology LTC5585 Manuel utilisateur

Preliminary

Linear Technology Confidential

LTC5585 Demo Board (DC1662A) Quick Start Guide

Quick Start Procedures:

1. Connect test equipments as shown in Figure 1 with all signal sources and DC supplies off.

2. Turn on the 5V DC power supply.

3. Connect EN to VCC_SENSE.

4. Monitor the DC volt meter, and adjust the DC supply voltage until VCC_SENSE is 5V.

5. Verify ICC is approximately 190mA.

6. Turn on the RF and the LO signal generators.

7. Adjust the spectrum analyzer settings. Be sure to use enough input attenuation to avoid over-

driving the spectrum analyzer.

8. Take measurement.

Using the IIP2 and DC Offset adjustment features:

Method 1 (On-board trim pots):

1. Install jumpers to all 6 positions of jumper block JP1

2. Apply 1V DC to VCTRL.

3. Connect EIP2 and EDC to VCC_SENSE.

4. Adjust REF trim pot until the voltage on the REF test point reaches 0.5V.

5. Adjust IIP2 and DC Offset using the on-board trim pots.

Method 2 (External voltage sources):

1. Remove jumpers from all 6 positions of jumper block JP1.

2. Connect EIP2 and EDC to VCC_SENSE.

3. Using 5 separate DC power supplies, apply 0.5V to each of the demo board REF, IP2I, IP2Q,

DCOI, and DCOQ test points.

4. Vary the voltages on IP2I, IP2Q, DCO1, and DCOQ to adjust IIP2 and DC Offset.

Preliminary

Linear Technology Confidential

Figure 1. Measurement Setup

Signal

Generator

SMJ100A

3dB

PAD

DC Block DC Block

Combiner

Mini-Circuits

ZFSCJ-2-1

Spectrum

Analyzer

FSEM30

DC Block DC Block

Combiner

Mini-Circuits

ZFSCJ-2-1

50-ohm

Termination

Signal

Generator

SME06

Signal

Generator

SME06

3dB

PAD

3dB

PAD

ZRL-3500

6dB

PAD

6dB

PAD

Combiner

MCLI

PS2-173

6dB

PAD

Mini-Circuits

DC Volt

Meter

1V DC Power

Supply

(20mA Minimum)

5V DC Power

Supply

(250mA Minimum)

Preliminary

Linear Technology Confidential

Figure2. Demo Board Schematic

Preliminary

Linear Technology Confidential

Item

Qty

Reference

Part Description

Manufacturer / Part #

1 0 C1-C8,C14,C17,C23-C28,R5-R8,R16 OPT, 0402

2 0 C9 OPT, 0603

3 7 C10,C11,C31-C35 CAP., X7R, 0.1uF, 10%, 16V, 0402 MURATA, GRM155R71C104KA88D

4 2 C13,C19 IND., MULTILAYER, 5.1nH, +/-0.3nH, 0402 MURATA, LQG15HS5N1S02D

5 3 C15,C36,C37 CAP., C0G, 1000pF, 5%, 50V, 0402 MURATA, GRM1555C1H102JA01D

6 1 C16 CAP., X7R, 4.7uF, 10%, 16V, 0805 MURATA, GRM21BR71C475KA73L

7 2 C12,C18 RES., CHIP, 0 Ohm, 0402 VISHAY, CRCW04020000Z0

8 4 C21,C22,C29,C30 CAP., X5R, 1uF, 10%, 10V, 0402 MURATA, GRM155R61A105KE15D

9 10 E1-E6,E8-E10,E13 TESTPOINT, TURRET, .063" MILL-MAX, 2308-2-00-80-00-00-07-0

10 3 E7,E11,E12 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

11 6 J1-J6 CONN., SMA, 50-OHM, EDGE-LANCH E.F.JOHNSON, 142-0701-851

12 1 JP1 HEADER, 6 X 2 PIN, 2MM SAMTEC, TMM-106-02-L-D

13 6 XJP1 (6 LOCATION FOR JP1) SHUNT SAMTEC, 2SN-BK-G

14 8 L1-L4,R1-R4 RES., CHIP, 0 Ohm, 0805 VISHAY, CRCW08050000Z0

15 1 L5 CAP., C0G, 1.0pF, +/-0.05pF, 0402 MURATA, GJM1555C1H1R0WB01D

16 1 L6 CAP., C0G, 1.2pF, +/-0.05pF, 0402 MURATA, GJM1555C1H1R2WB01D

17 5 PT1-PT5 POT., 4mm SMD, 500 Ohm BOURNS, 3214X-1-501-E

18 4 R9,R11,R13,R14 RES., CHIP, 100Ohm, 1%, 1/16W, 0402 VISHAY, CRCW0402100RFKED

19 1 R15 RES., CHIP, 1 Ohm, 1%, 1/8W, 0805 VISHAY, CRCW08051R00FNEA

20 1 T1 TRANSFORMER, RFBALUN ANAREN, BD0826J50200A00

IC, LT5585IUF#PBF, QFN 4mm X 4mm

LINEAR TECH., LT5585IUF#PBF

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