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Description
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
MIMO receiver applications that require low power and small
size. Each mixer includes an independent LO buffer amplifier,
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
300MHz to 4GHz 3.3V DUAL
ACTIVE DOWNCONVERTING MIXER
aBsolute MaxiMuM ratings
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.
Figure 1. Test Setup for Mixer 2-Tone Measurements
DEMO MANUAL DC1719A
Supply Voltage (V
, V
CCA
CCB
+
–
IFB
, IFB
) ...................................................................4V
Enable Input Voltage (ENA, ENB) ......–0.3V to V
Mixer Bias Voltage (BIASA, BIASB) ....–0.3V to V
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 (T
Junction Temperature (T
J
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.
LTC5569
+
–
, IFA
, IFA
,
+ 0.3V
CC
+ 0.3V
CC
) ........ –40°C to 105°C
C
) .................................... 150°C
dc1719af
1
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Related Manuals for Linear Technology DC1719A
Summary of Contents for Linear Technology DC1719A
- Page 1 IF filters and the LTC5569. amplifiers. 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. Design files for this circuit board are available at http://www.linear.com/demo...
- Page 2 DEMO MANUAL DC1719A notes on test equipMent anD setup • Use high performance signal generators with low • Spectrum analyzers can produce significant internal harmonic outputs for 2-tone measurements to avoid distortion products if they are overdriven. Generally, distortion. Otherwise, lowpass filters at the signal gen- spectrum analyzers are designed to operate at their erator outputs should be used to suppress harmonics.
- Page 3 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.
- Page 4 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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