MAX2510EVKIT-SO Maxim Integrated Products, MAX2510EVKIT-SO Datasheet - Page 3

• Manufacturer Part Number: MAX2510EVKIT-SO
• Description: RF Modules & Development Tools MAX2510 EVAL KIT MAX2510 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX2510EVKIT-SO

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7) The USB output power should be approximately
8) When the transmitter is working properly, you may
This section describes how to connect and use the
MAX2510’s receiver section.
1) Remove the I and Q input signal sources to prevent
2) Switch the part into Rx mode by moving the RXEN
3) Change the LO frequency to equal the desired Rx
4) Connect RXIN to a second RF-signal generator
5) Connect an oscilloscope to the limiter outputs
6) Connect a voltmeter to the RSSI test pad in the
transmitter is set in USB mode and the lower side-
band (LSB) is the suppressed sideband. If the
application requires LSB, reverse the relevant
instructions. The EV kit also accommodates differ-
ential I and Q inputs. (Refer to the Detailed
Description section.)
0dBm with GC = 2V. Test the GC function by slowly
lowering the voltage on the GC pin from 2V to 0V.
You will see at least a 40dB change in USB power
over this voltage range.
wish to test other features, such as shutdown mode
(both TXEN and RXEN jumpers set to “low”. The I
and Q inputs can be adjusted to check transmitter
gain over frequency, VBIAS voltage, etc.
crosstalk into the receiver during Rx-mode mea-
surements. The GC and VBIAS voltage supplies
have no function in Rx mode.
jumper to the “high” position and the TXEN jumper
to the “low” position.
frequency minus 10.7MHz. This provides a
10.7MHz downconverted signal into the off-chip fil-
ter (a 10.7MHz bandpass type). For a 240MHz Rx
frequency, the LO frequency should be (240 - 10.7
= 229.3 MHz). Leave the LO power level at -13dBm.
using an SMA cable. Terminate RXIN with 50Ω.
For differential operation, connect the signal gener-
ator to RXIN and RXIN through a balun. Set this
generator’s frequency to 240MHz at -30dBm of out-
put power.
LIMOUT and LIMOUT. A 2-channel oscilloscope
with low-capacitance probes is ideal. The signals
from LIMOUT and LIMOUT should be approximate-
ly 600mVp-p and out-of-phase with each other.
upper-left corner of the EV kit to monitor the RSSI
output voltage. For -30dBm of RXIN power, the
RSSI voltage should be 1.8V. Lower the input power
in 10dBm steps, observing the decrease in RSSI
output voltage of about 20mV per 1dB change in
input power. Return the power level to -30dBm.
_______________________________________________________________________________________
Rx Mode
MAX2510 Evaluation Kit
7) Observe that the signals at LIMOUT and LIMOUT
Besides the Tx and Rx modes previously mentioned, the
MAX2510 supports two other operating modes: shutdown
and standby. Bring both TXEN and RXEN jumpers to the
“low” position, putting the part in shutdown mode and
reducing the supply current to 2.0µA (typical).
To enter standby mode, bring both TXEN and RXEN
jumpers to the “high” position. This reduces the supply
current to about 0.5µA while leaving the VREF generator
active (for fast switching into receive mode).
The following section covers the EV kit’s circuit design
in detail. (See the MAX2510 data sheet for additional
information.)
The I, I, Q, and Q pins comprise the quadrature modu-
lator’s baseband inputs. They require external DC bias-
ing to set a common-mode level of approximately 1.4V.
On the EV kit, this voltage is provided by external resis-
tors and a voltage supply (VBIAS). The I and Q pins are
AC coupled to SMA connectors, which induces a high-
pass cutoff of approximately 300Hz. The I and Q pins
are biased to the common-mode voltage and AC
grounded. Test points on the EV kit allow flexible
access to these pins if the application requires differen-
tial drive.
The MAX2510’s Tx outputs (TXOUT and TXOUT) are
high-impedance open collectors; therefore, external
inductors are used for proper biasing. DC-blocking
capacitors are used to connect to these outputs. The
inductors and capacitors act only to provide biasing;
they do not set the output impedance. For single-ended
applications, terminate TXOUT with a 50Ω terminator.
Alternatively, replace L4 with a 0Ω short. Refer to the
MAX2510 data sheet for more information on matching
this port.
The Rx inputs (RXIN and RXIN) require an impedance-
matching network for optimum performance. The Rx
inputs are matched to 240MHz on the EV kit as
shipped. The input matching network comprises a
series capacitor from each Rx input SMA connector to
the part, as well as a shunt inductor across RXIN and
RXIN. The EV kit layout provides space for additional
components: one series element on each side and a
_______________Detailed Description
remain at constant level over the RXIN power range.
Power-Management Features
Transmitter Output
Baseband Inputs
Advanced System
Receiver Input
3