2

dc1861af

DEMO MANUAL DC1861A

QUICK START PROCEDURE

1. Connect all test equipment as shown in Figure 1.

2. Set the power supply output voltage to 3.3V, and set

the current limit to 150mA.

PIN BEFORE THE EN PIN TO ENSURE THAT THE PART

DOES NOT GET DAMAGED. ALSO, REMOVE POWER

FROM EN PIN BEFORE REMOVING POWER FROM

4. Set the LO signal generator to provide a 1800MHz CW

signal at about 0dBm to the demo board’s LO port.

5. Set the RF signal generators to provide one 1950MHz

CW signal and one 1951MHz CW signal. The signals

should be applied to the 2-way combiner. The output

of the combiner should be applied to the demo board’s

RF input port. The two tones should be set to about

–6dBm each at the mixer’s RF input port.

6. Set the spectrum analyzer’s center frequency to 150MHz.

7. Perform various measurements (Conversion Gain, OIP3,

LO leakage, etc.)

PARTS LIST

NOTES ON TEST EQUIPMENT AND SETUP

• High performance signal generators with low harmonic

outputs should be used for 2-tone measurements. Oth-

erwise, lowpass filters at the signal generator outputs

should be used to suppress harmonics.

• High quality combiners should be used to present a

broadband 50Ω termination on all ports as well as pro-

vide good port-to-port isolation. Attenuator pads may

be used on the inputs to the combiner and the RF input

port of the LTC5567 mixer shown in Figure 1. Adding

attenuator pads further improves source isolation and

helps prevent the signal generators from producing

intermodulation products.

• Spectrum analyzers can produce significant internal

distortion products if they are overdriven. Generally,

spectrum analyzers are designed to operate at their

best with about –30dBm to –40dBm at their input. The

spectrum analyzer’s input attenuation setting should

be used to avoid saturating the instrument. Set the

spectrum analyzer’s input attenuation depending on

the spectrum analyzer used.

• Before performing measurements on the DUT, the sys-

tem performance should be evaluated to ensure that

a clean input signal is obtained and that the spectrum

analyzer’s internal distortion is minimized.

ITEM

QTY

REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

1

2

C1, C2

CAP, X7R, 0.01μF, 25V, 10%, 0402

AVX, 04023C103KAT

2

1

C3

CAP, NPO, 2.7pF, 50V, 5%, 0402

AVX, 04025A2R7JAT

3

0

C4, C6

TBD, 0402

4

1

C5

CAP, NPO, 3.9pF, 50V, 5%, 0402

AVX, 04025A3R9JAT

5

2

C7, C8

CAP, NPO, 330pF, 16V, 5%, 0402

AVX, 0402YA331JAT

6

1

C9

CAP, X7R, 1μF, 10V, 10%, 0603

AVX, 0603ZC105KAT

7

4

E1-E4

TESTPOINT, TURRET, 0.063" PBF

MILL-MAX, 2308-2-00-80-00-00-07-0

8

4

J1-J4

CONN, SMA, 50Ω EDGE-LANCH

E. F. JOHNSON, 142-0701-851(PBF)

9

2

L1, L2

INDUCTOR, WIREWOUND, 300nH, ±5%, 0603

COILCRAFT, 0603HP-R30XJLW

10

2

R1, R2

RES, CHIP, 3.01k, 1/16W, 1% 0402

VISHAY, CRCW04023K01FKED

11

0

R3

TBD, 0402

12

1

R4

RES, CHIP, 0Ω, 0603

NIC NRC060000TRF

13

1

T1

RF TRANSFORMER, TC8-1-10LN+

MINI-CIRCUITS, TC8-1-10LN+

14

1

U1

I.C. LTC5567IUF, QFN 16 PIN, 4mm

× 4mm

LINEAR TECH. INC., LTC5567IUF