Linear Technology LTC5585 User manual

Preliminary
Linear Technology Confidential 1
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 2
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
ZRL-3500
6dB
PAD
6dB
PAD
Combiner
MCLI
PS2-173
6dB
PAD
Mini-Circuits
Mini-Circuits
DC Volt
Meter
1V DC Power
Supply
(20mA Minimum)
5V DC Power
Supply
(250mA Minimum)

Preliminary
Linear Technology Confidential 3
Figure2. Demo Board Schematic

Preliminary
Linear Technology Confidential 4
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
21
1
U1
IC, LT5585IUF#PBF, QFN 4mm X 4mm
LINEAR TECH., LT5585IUF#PBF

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