Datasheet
MAX2410
Low-Cost RF Up/Downconverter
with LNA and PA Driver
8 _______________________________________________________________________________________
______________________________________________________________Pin Description
LNA Output. AC couple to this pin. This output typically provides a VSWR of better than 2:1 at frequen-
cies from 1.7GHz to 3GHz with no external matching components. At other frequencies, a matching
network may be required to match this pin to an external filter. Consult the
Typical Operating
Characteristics
for a plot of LNA Output Impedance vs. Frequency.
LNAOUT27
LNA Output Ground. Connect to PC board ground plane with minimal inductance.GND26
Receive Mixer Input Ground. Connect to PC board ground plane with minimal inductance.GND25
RF Input to Receive Mixer (Downconverter). AC couple to this pin. This input typically requires a matching
network for connecting to an external filter. See the
Typical Operating Characteristics
for a plot of RXMXIN
Impedance vs. Frequency.
RXMXIN24
IF Input of Transmit Mixer (Upconverter). AC couple to this pin. IFIN presents a high input impedance
and typically requires a matching network. See the
Typical Operating Characteristics
for a plot of IFIN
Impedance vs. Frequency.
IFIN22
IF Output of Receive Mixer (Downconverter). AC couple to this pin. This output is an open collector and
should be pulled up to V
CC
with an inductor. This inductor can be part of the matching network to the
desired IF impedance. Alternatively, a resistor can be placed in parallel to this inductor to set a termi-
nating impedance. See the
Typical Operating Circuit
for more information.
IFOUT21
RF Output of Transmit Mixer (Upconverter). AC couple to this pin. Use an external shunt inductor to
V
CC
as part of a matching network to 50Ω. This also provides DC bias. See the
Typical Operating
Characteristics
for a plot of TXMXOUT Impedance vs. Frequency.
TXMXOUT19
RF Input to Variable-Gain Power-Amplifier Driver. AC couple to this pin. Internally matched to 50Ω. This
input typically provides a 2:1 VSWR at 1.9GHz. See the
Typical Operating Characteristics
for a plot of
PADRIN Impedance vs. Frequency.
PADRIN16
Power-Amplifier Driver Input Ground. Connect to PC board ground plane with minimal inductance.GND15, 17
Power-Amplifier Driver Output. AC couple to this pin. Use external shunt inductor to V
CC
to match this pin
to 50Ω. This also provides DC bias. See the
Typical Operating Characteristics
for a plot of PADROUT
Impedance vs. Frequency.
PADROUT13
Gain-Control Input for Power-Amplifier Driver. By applying an analog control voltage between 0V and
2.15V, the gain of the PA driver can be adjusted over a 35dB range. Connect to V
CC
for maximum gain.
GC11
Logic-Level Enable for Transmitter Circuitry. A logic high turns on the transmitter. When TXEN and
RXEN are both at a logic high, the part is placed in standby mode, with 160µA (typical) supply current.
If TXEN and RXEN are both at a logic low, the part is set to shutdown mode, with 0.1µA (typical) supply
current.
TXEN9
50Ω Inverting Local-Oscillator Input Port. For single-ended operation connect LO directly to GND. If a
differential LO signal is available, AC couple the inverted LO signal to this pin.
LO
8
50Ω Local-Oscillator (LO) Input Port. AC couple to this pin.LO7
Logic-Level Enable for Receiver Circuitry. A logic high turns on the receiver. When TXEN and RXEN are
both at a logic high, the part is placed in standby mode, with a supply current of 160µA (typical). If
TXEN and RXEN are both at a logic low, the part is set to shutdown mode, with a supply current of
0.1µA (typical).
RXEN6
Supply Voltage (2.7V to 5.5V). Bypass V
CC
to GND at each pin with a 47pF capacitor as close to each
pin as possible.
V
CC
5, 10
RF Input to the LNA. AC couple to this pin. At 1.9GHz, LNAIN can be easily matched to 50Ω with one
external shunt 1pF capacitor.
LNAIN2
PIN
Ground. Connect to PC board ground plane with minimal inductance.GND
1, 3, 4, 12,
14, 18, 20,
23, 28
FUNCTIONNAME