MAX2045 MAXIM [Maxim Integrated Products], MAX2045 Datasheet - Page 17

• Manufacturer Part Number: MAX2045
• Description: High-Gain Vector Multipliers
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX2045/MAX2046/MAX2047 provide vector
adjustment through the differential I/Q amplifiers. Each
part is optimized for separate frequency ranges:
MAX2045 for f
f
790MHz to 1005MHz. All three devices can be inter-
faced using current- and/or voltage-mode DACs.
The MAX2045/MAX2046/MAX2047 accept differential
RF inputs, which are internally phase shifted 90
degrees to produce differential I/Q signals. The phase
and magnitude of each signal can then be adjusted
using the voltage- and/or current-control inputs.
Figure 1 shows a typical operating circuit when using
both current- and voltage-mode DACs. When using
only one of the two, leave the unused I/Q inputs open.
IN
10, 11, 14,
15, 16, 19,
23–27, 30,
Exposed
20, 21,
31, 32
17, 18
= 1740MHz to 2060MHz, and MAX2047 for f
PIN
Pad
12
13
22
28
29
1
2
3
4
5
6
7
8
9
REFOUT
RFOUT1
RFOUT2
IN
NAME
RBIAS
RFIN1
RFIN2
GND
VQ1
VQ2
V
IQ1
IQ2
VI1
VI2
II1
II2
—
CC
= 2040MHz to 2240MHz, MAX2046 for
______________________________________________________________________________________
Detailed Description
Noninverting in-phase voltage-control input. Requires common-mode input voltage (2.5V typ).
Inverting in-phase voltage-control input. Requires common-mode input voltage (2.5V typ).
Noninverting quadrature voltage-control input. Requires common-mode input voltage (2.5V typ).
Inverting quadrature voltage-control input. Requires common-mode input voltage (2.5V typ).
Noninverting in-phase current-control input. This pin can only sink current. It cannot source current.
Inverting in-phase current-control input. This pin can only sink current. It cannot source current.
Noninverting quadrature current-control input. This pin can only sink current. It cannot source current.
Inverting quadrature current-control input. This pin can only sink current. It cannot source current.
2.5V Reference Output. Integrated reference voltage provides a 2.5V output for single-ended voltage-
control applications. For single-ended operation, connect REFOUT to the inverting voltage inputs (VI2,
VQ2).
Ground
Noninverting RF Output
Inverting RF Output
Supply Voltage
Bias Setting Resistor. Connect a 280Ω (±1%) resistor from this pin to ground to set the bias current for
the IC.
Noninverting RF Input
Inverting RF Input
Exposed Pad. Exposed pad on the bottom of the IC should be soldered to the ground plane for proper
heat dissipation and RF grounding.
High-Gain Vector Multipliers
IN
=
The RF input and output ports require external matching
for optimal performance. See Figures 1 and 2 for appro-
priate component values. The output ports require
external biasing. In Figures 1 and 2, the outputs are
biased through the balun (T2). The RF input ports can
be driven differentially or single ended (Figures 1, 2)
using a balun. The matching values for the MAX2045/
MAX2046 were set to be the same during characteriza-
tion. An optimized set of values can be found in the
MAX2045/MAX2046/MAX2047 Evaluation Kit data
sheet.
The control amplifiers convert a voltage, current, or
voltage and current input to a predistorted voltage that
controls the multipliers. The I/Q voltage-mode inputs
can be operated differentially (Figure 1) or single
ended (Figure 2). A 2.5V reference is provided on-chip
for single-ended operation.
FUNCTION
Pin Description
I/Q Inputs
RF Ports
17