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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
Pin Description (continued)
PIN
17
18
19
20
—
NAME
CTRL1
MIX_IN
IF_OUT
V CC_IF
EP
FUNCTION
Functional Control Bit (see Table 1)
Mixer Input. See the Typical Application Circuit for connection details.
Driver Amplifier Output (50 I ). See the Typical Application Circui t for connection details.
Driver-Amplifier Supply Voltage Input. Bypass to ground with a 10nF capacitor as close as
possible to the pin.
Exposed Pad. Internally connected to GND. Solder this exposed pad to a PCB pad that uses
multiple ground vias to provide heat transfer out of the device into the PCB ground planes. These
multiple via grounds are also required to achieve the noted RF performance (see the Layout
Considerations section).
Table 1. Mode Control Logic
CTRL1
0
1
CTRL2
0
0
VGA
Disabled
Enabled
MIXER
Disabled
Enabled
ERROR
AMPLIFIER
Disabled
Disabled
ALC
LOOP
Disabled
Disabled
ALARM
Disabled
Disabled
FUNCTIONAL DESCRIPTION
Power-Down Mode
VGA/Mixer Only Mode
Closed ALC Mode:
1
1
Enabled
Enabled
Enabled
Enabled
Enabled
ALC loop locks DET_VIN
to PLVLSET
0
1
—
—
—
—
—
Factory Test Mode
(Do Not Use)
Detailed Description
The MAX2091 is a monolithic SiGe BiCMOS upconverter
IC that integrates an analog variable-gain amplifier, an
upconverting mixer stage, and image filter. The device
amplifies IF signals in the 50MHz to 500MHz range
before mixing them with an LO signal. The resulting
1735MHz to 1935MHz upconverted signal is then filtered
on-chip as the final stage of signal conditioning.
The analog attenuator is controlled by an external analog
control voltage. Device features include 23dB gain (no
attenuation), 5.4dB NF (no attenuation, including attenu-
ator insertion loss), and +24.5dBm OIP3. Each of these
features makes the MAX2091 an ideal upconverter for
numerous transmitter applications. When paired with the
MAX2092 RF VGA, a complete 2-chip IF-RF signal con-
ditioning solution is possible for microwave point-to-point
transmitter applications.
Applications Information
Modes of Operation
The MAX2091 can operate in several different modes, as
summarized in Table 1 .
VGA/Mixer-Only Mode Operation
VGA/mixer-only mode operation consists of setting
CTRL1 = logic 1 and CTRL2 = logic 0 and applying a DC
value to PLVLSET between 0 and 2.5V DC, to manually
adjust the IF attenuator and subsequently the RF_OUT
power. The output power at RF_OUT increases at a
rate of 19.5dB/V as PLVLSET is increased when IF_IN
is driven with a fixed input power between -25dBm and
+5dBm. The error amplifier and alarm are powered off
in this mode, reducing the supply current (10mA typ). In
VGA/mixer-only mode, components R5, R7, C8, C9, and
C16 are left unpopulated.
24
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