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MAX2091
50MHz to 500MHz Analog VGA, 1735MHz to 1935MHz
Upconverting Mixer with Image Filtering, Threshold
Alarm Circuit, and Error Amplifier for Level Control
Additionally, a lowpass filter can be used between the
VGA output and the mixer input to reduce possible image
noise (RF + LO) at the VGA output from being downcon-
verted to the mixer output. Contact the factory for details.
Alarm Operation
The alarm output (ALM) remains in a logic-high state,
while DET_IN is above 1.35V nominally. ALM_THRES has
135k I input resistance and is set internally to 1.35V (typ),
such that ALM triggers when DET_IN is below 1.35V.
Alternatively, the voltage on ALM_THRES can be exter-
nally driven to allow alternative power-level trip points.
The ALM comparator has a typical hysteresis of 29mV.
Mixer LO Inputs
The mixer is designed to operate with LO+ signal levels
between -10dBm and -4dBm and with LO- grounded. In
cases where V CC is applied to the MAX2091 and LO+
is below approximately -15dBm, the mixer’s LO driver
could produce undesired spurious at RF_OUT. In such
a case, applying -10dBm to -4dBm to LO+ returns the
mixer to proper operation. To eliminate the possibility
of spurious at RF_OUT with invalid LO+ signal levels,
power-down mode can be asserted (CTRL1 = CTRL2 =
logic 0) to disable RF_OUT.
Layout Considerations
The pin configuration of the MAX2091 is optimized to
facilitate a very compact physical layout of the device and
its associated discrete components. The exposed pad
Table 2. Typical Application Circuit Component Values
MODE OF OPERATION
COMPONENT
C1, C5, C7
C2, C3,
C10, C12
C4, C11
C8
C9
VGA/MIXER
ONLY
ü
ü
ü
CLOSED-ALC
ü
ü
ü
ü
ü
VALUE
1000pF
0.01 F F
100pF
100nF
820pF
SIZE
0402
0402
0402
0603
0402
VENDOR
Murata
Murata
Murata
Murata
Murata
DESCRIPTION
C0G Dielectric
X7R Dielectric
C0G Dielectric
X7R Dielectric
C0G Dielectric
C14*
Do Not Install
0402
C15
C16
L1
R1
R2, R3**
R4**
R5
R7
R11*
U1
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
1 F F
0.01 F F
330nH
1.78k I
7.1 I
174 I
150 I
24k I
0 I
—
0603
0402
0603
0402
0402
0402
0402
0402
0402
20-pin TQFN
(5mm x 5mm)
Murata
Murata
Coilcraft
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Maxim
X7R Dielectric
X7R Dielectric
Ferrite LS series
5% Tolerance
1% Tolerance
1% Tolerance
1% Tolerance
1% Tolerance
5% Tolerance
1% Tolerance
MAX2091ETP+
Note: The checkmarks in the Mode of Operation columns indicate that the component is used within each respective application.
* C14 and R11 form an optional lowpass network to filter out potential noise from the external PLVLSET control source.
** R2–R4 form an optional 2.5dB attenuator pad.
26
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