PRELIMINARY DATA SHEET • SKY73035 DOWNCONVERSION MIXER
A high isolation SPDT switch allows the SKY73035 to be used for
frequency hopping applications. This switch provides greater than
40 dB of LO1 to LO2 isolation:
Functional Description
The SKY73035 is a high gain single mixer, optimized for base
station receiver applications. The device consists of a low loss RF
balun, high linearity passive mixer, and a low noise IF amplifier.
An LO amplifier is also included that allow the SKY73035 to
connect directly to the output of a Voltage Controlled Oscillator
(VCO). This eliminates the extra gain stages needed by most
discrete passive mixers. A Single Pole, Double Throw (SPDT)
switch has been included to select between two different LO
inputs (LO1 and LO2) for frequency hopping applications such as
GSM.
LO_SEL Input
High
LO Path Selected
LO1 (pin 11) enabled
LO2 (pin 15) enabled
Low
For applications that do not require frequency hopping, LO_SEL is
fixed to one state and the appropriate LO input is used. An internal
pull-down resistor enables the LO2 input.
RF Baluns and Passive Mixer
IF Amplifier
The RF baluns provide a single ended input, which can easily be
matched to 50 Ω using a simple external matching circuit. The RF
baluns offer very low loss, and excellent amplitude and phase
balance.
The SKY73035 includes high dynamic range IF amplifiers that
follow the passive mixers in the signal path. The outputs require a
supply voltage connection using inductive chokes. These choke
inductors should be high-Q and have the ability to handle 200 mA
or greater.
The high linearity SKY73035 is a passive, double balanced mixer
that provides a very low conversion loss, and excellent 3rd Order
Input Insertion Point (IIP3).
A simple matching network allows the output ports to be matched
to a balanced 200 Ω impedance. The IF amplifiers are optimized
for IF frequencies between 50 and 500 MHz. The IF amplifiers can
be operated outside of this range, but with a slight degradation in
performance.
Addtionally, the balanced nature of the mixer provides for high
port-to-port isolation.
LO Buffers and SPDT LO Switch
The LO buffers allow the input power of the SKY73035 to be in
the range of ±3.0 dBm. The LO section is optimized for high-side
LO injection. However, each of the two LOs can be driven over a
wide frequency range with only slight degradation in
performance.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY73035 are provided in
Table 2 and the recommended operating conditions in Table 3.
Electrical characteristics for the SKY73035 are provided in
Table 4.
Table 2. SKY73035 Absolute Maximum Ratings
Parameter
Supply voltage, +5 V
Symbol
Minimum
Maximum
5.5
Units
V
VCC
ICC
4.5
Supply current
240
mA
dBm
dBm
°C
RF input power
PRF
PLO
TC
20.0
LO input power
20.0
Operating case temperature
Junction temperature
Storage case temperature
–40
–40
+85
TJ
+150
+125
°C
TSTG
°C
Notes: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value.
Nominal thermal resistance (junction to case) is 5.1 °C/W.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200712A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • May 3, 2007
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