DC2070A Datasheet DC2070A | P1-P3

dc2070afa

DEMO MANUAL DC2070A

DESCRIPTION

LTC5577

300MHz to 6GHz

High Signal Level Active

Downconverting Mixer

Demonstration circuit DC2070A is optimized for evaluation

of the LT C

5577 high signal level active downconverting

mixer. Its RF input port is matched to 50Ω from 1.3GHz to

4.3GHz with 12dB return loss, and the LO port is matched

to 50Ω from 930MHz to 4.1GHz with 10dB return loss.

The RF and LO inputs are easily matched for higher or

lower frequencies with simple external matching, as low

as 350MHz and 300MHz, respectively. The low capacitance

differential IF output is usable up to 1.5GHz. The LTC5577

active mixer is optimized for RF downconverting applica

tions that require high input signal handling capability and

wide bandwidth.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog

Devices, Inc. All other trademarks are the property of their respective owners.

Figure 1. Test Setup for Mixer 2-Tone Measurements

ABSOLUTE MAXIMUM INPUT

RATINGS

Supply Voltage (V

, IF

–

) .....................................4V

Enable Input Voltage (EN) ................–0.3V to V

+ 0.3V

LO Input Power (300MHz to 6GHz) ...................... 10dBm

LO Input DC Voltage ............................................... ±0.1V

RF Input Power (300MHz to 6GHz) ......................18dBm

RF Input DC Voltage ............................................... ±0.1V

TEMP Monitor Input Current ..................................10mA

Operating Temperature Range (T

) ........ –40°C to 105°C

Junction Temperature (T

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

Storage Temperature Range .................. –65°C to 150°C

CAUTION: THIS PART IS SENSITIVE TO ELECTRO-

STATIC DISCHARGE (ESD). OBSERVE PROPER ESD

PRECAUTIONS WHEN HANDLING THE LTC5577.

BOARD PHOTO

dc2070afa

DEMO MANUAL DC2070A

NOTES ON TEST EQUIPMENT AND SETUP

QUICK START PROCEDURE

High performance signal generators with low harmonic

outputs should be used for 2-tone measurements.

Otherwise, low pass filters at the signal generator out-

puts should be used to suppress harmonics.

High quality combiners should be used to present a

broadband 50Ω termination on all ports as well as

provide good port-to-port isolation. Attenuator pads

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

input port of the LTC5577 mixer, as shown in Figure 1.

Adding attenuator pads further improves source iso-

lation and helps prevent the signal generators from

producing intermodulation products.

1. Set the power supply output voltage to 3.3V and the

current limit to 250mA. Turn off the power supply

output.

2. Connect all test equipment and the power supply as

shown in Figure 1.

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

system performance should be evaluated to ensure that

a clean input signal is obtained and that the spectrum

analyzer’s internal distortion is minimized

3. Ramp on the power supply with a minimum ramp time

of 1ms.

4. Set the LO signal generator to provide an 1800MHz

CW signal at about 0dBm at the DC2070A’s LO port.

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 4 C1, C2, C7, C8 CAP, 1nF, 10%, 16V, X7R, 0402 MURATA, GRM155R71C102KA01D

2 1 C3 CAP, 8.2pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H8R2CA01D

3 1 C4 CAP, 0.7pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1HR70BB01D

4 1 C5 CAP, 3.9pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H3R9BB01D

5 0 R3, L4, L5, L6, C6, C10, C11,

C12, C13

COMP, 0402, OPT 0402

6 1 C9 CAP, 1µF, 10%, 10V, X7R, 0603 MURATA, GRM188R61A105KA61D

7 3 E1, E3, E4 TURRET, PAD, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

8 1 E2 TURRET, PAD, 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0

9 4 J1-J4 CONN, SMA, 50Ω, EDGE-LAUNCH E.F. JOHNSON, 142-0701-851

10 2 L1, L2 IND, 560nH, 2%, 0603 COILCRAFT, 0603LS-561XGL

11 2 R1, R2 RES, CHIP, 115, 1%, 0402 VISHAY, CRCW0402115RFKED

12 1 U1 IC, LINEAR TECHNOLOGY, LTC5577IUF,

QFN16, 4×4

LINEAR TECHNOLOGY, LTC5577IUF

dc2070afa

DEMO MANUAL DC2070A

SCHEMATIC DIAGRAM

Figure 2. High Signal Level Active Mixer

5. Set the two RF signal generators to provide one

1949MHz CW signal and one 1951MHz CW signal.

The signals should be applied to the 0° combiner. The

power applied to the DC2070A’s RF input port should

be about –3dBm/tone.

6. Perform various measurements (conversion gain, IP3,

LO leakage, etc.).

7. To turn off the DC2070A, either turn off the power sup

ply’s output, or remove the power leads starting with

the EN lead.

QUICK START PROCEDURE

P1-P3 P4-P4

DC2070A

Mfr. #:

Buy DC2070A

Manufacturer:

Analog Devices Inc.

Description:

RF Development Tools LTC5577 - 300MHz to 6GHz High Signal Lev

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

DC2070A