Linear Technology DC1719A Quick setup guide

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DEMO MANUAL DC1719A
Description
LTC5569
300MHz to 4GHz 3.3V DUAL
ACTIVE DOWNCONVERTING MIXER
Demonstration circuit DC1719A is optimized for evaluation
of the LTC
®
5569 dual active downconverting mixer. Its RF
and LO input ports are internally matched to 50Ω from
1.4GHz to 3.3GHz, and from 1GHz to 3.5GHz, respectively.
The IF output uses a bandpass network followed by an
8:1 transformer to provide a 50Ω match at 190MHz. The
LTC5569 dual active mixer is optimized for diversity and for
MIMOreceiverapplicationsthatrequirelowpowerandsmall
size.Eachmixerincludes an independentLObufferamplifier,
an active mixer core, and a bias circuit with an enable pin.
The symmetry of the IC assures that a phase and ampli-
tude coherent LO is applied to each mixer. Broadband
integrated transformers on the RF and LO inputs provide
single-ended 50Ω interfaces. The differential IF outputs
allow convenient interfacing to differential IF filters and
amplifiers.
Design files for this circuit board are available at
http://www.linear.com/demo
BoarD photo
Figure 1. Test Setup for Mixer 2-Tone Measurements
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
aBsolute MaxiMuM ratings
Supply Voltage (VCCA, VCCB, IFA+, IFA–,
IFB+, IFB–)...................................................................4V
Enable Input Voltage (ENA, ENB) ......–0.3V to VCC + 0.3V
Mixer Bias Voltage (BIASA, BIASB)....–0.3V to VCC + 0.3V
LO Input Power (350MHz to 4.3GHz)...................10dBm
LO Input DC Voltage............................................... ±0.1V
RF Input Power (300MHz to 4GHz)......................15dBm
RF Input DC Voltage (RFA, RFB) ............................ ±0.1V
Operating Temperature Range (TC)........ –40°C to 105°C
Junction Temperature (TJ).................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
CAUTION: This part is sensitive to electrostatic discharge
(ESD). Observe proper ESD precautions when handling
the LTC5569.

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DEMO MANUAL DC1719A
notes on test equipMent anD setup
quick start proceDure
• Use high performance signal generators with low
harmonic outputs for 2-tone measurements to avoid
distortion. Otherwise, lowpass filters at the signal gen-
erator 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
provide good port-to-port isolation. Attenuator pads
may be used on the inputs to the combiner and the RF
input port of the LTC5569 mixer, as shown in Figure1.
Adding attenuator pads further improves source iso-
lation 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
system performance should be evaluated to ensure
that a clean input signal is obtained and that the spec-
trum analyzer’s internal distortion is minimized.
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 2 C1, C2 0402 2.7pF ±0.25pF 50V NPO AVX, 04025A2R7CAT2A
2 1 C5 CAP, 0402 3.9pF ±0.1pF 50V NPO AVX, 04025A3R9BAT
3 4 C7, C8, C9, C10 CAP, 0402 10nF 10% 25V X7R AVX, 04023C103KAT
4 1 C11 CAP, 0603 2.2µF 10% 6.3V X5R AVX, 06036D225KAT
5 5 J1, J2, J3, J4, J5 CONN, BNC, SMA 50Ω EDGE-LANCH E. F. JOHNSON, 142-0701-851
6 4 L1, L2, L3, L4 0603 180nH 2% COILCRAFT, 0603HP-R18XGL
7 0 R1, R2, R3, R4 RES, 0402 OPTION OPTION
8 4 TP1, TP2, TP3, TP4 TURRET MILL-MAX, 2308-2-00-80-00-00-07-0
9 2 T1, T2 XFMR, WIDEBAND 2MHz TO 500MHz MINI-CIRCUITS, TC8-1+
10 1 U1 IC, DUAL ACTIVE DOWNCONVERTING MIXER LINEAR TECHNOLOGY, LTC5569IUF
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 250mA.
3. Connect the VCC pin to the 3.3V supply. Connect ENA
to the 3.3V supply.
BE SURE TO CONNECT THE VCC PIN
BEFORE THE
ENA PIN TO ENSURE THAT THE PART DOES NOT GET
DAMAGED. ALSO, REMOVE POWER FROM ENA PIN
BEFORE REMOVING POWER FROM THE VCC PIN.
4. Set the LO signal generator to provide a 2140MHz 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
RFA 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
190MHz.
7. Perform various measurements (conversion gain,
OIP3, LO leakage, etc.).

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DEMO MANUAL DC1719A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
scheMatic DiagraM
Figure 2. Dual Active Mixer

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DEMO MANUAL DC1719A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0611 • PRINTED IN USA
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