MAX2370EVKIT Maxim Integrated Products, MAX2370EVKIT Datasheet - Page 4

• Manufacturer Part Number: MAX2370EVKIT
• Description: RF Modules & Development Tools MAX2370 EVAL KIT MAX2370 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX2370EVKIT

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

1) Connect a CDMA RF signal generator to the IFIN
2) Connect RFL to the spectrum analyzer. Configure
3) Set the V
1) Connect the CDMA baseband signal generator to
2) Connect an external 120MHz bandpass filter
3) Connect RFL to the spectrum analyzer. Configure
4) Adjust the V
Apply a voltage from 0.5V to 2.5V to header VGC to
adjust the IF and RF VGA of the MAX2370. The VGC
voltage is filtered on the EV kit to minimize undesired
amplitude modulation.
MAX2370 Evaluation Kit
4
port using the SMA connector. Set the carrier fre-
quency to 120MHz, set the output power to
-16.5dBm, and set the modulation to reverse-chan-
nel CDMA.
the spectrum analyzer to measure ACPR for
reverse-channel CDMA. Set the center frequency to
455MHz with a +10dBm reference level and 30kHz
resolution bandwidth.
power until the RF output power is +8dBm. The
ACPR at ±885kHz offset will be approximately
-67dBc, and the ACPR at ±1.98MHz will be approx-
imately -86dBc.
the I and Q ports using BNC connectors. Set the
modulation to reverse-channel CDMA at a 780mV
output level. The nominal input level at the IC’s I/Q
input pins is 130mV
voltage at the chip’s I/Q inputs and adjust the signal
generator’s output if necessary to achieve
130mV
between the IFOUT and IFIN ports of the MAX2370
evaluation kit. A 50Ω filter with approximately 4dB of
insertion loss is recommended, or an attenuator with
a loss of 4dB can be used if a 120MHz filter is not
available. The on-board baluns and matching net-
works at the IFOUT and IFIN ports each add approx-
imately 0.5dB of loss, for a total IF loss of 5dB.
the spectrum analyzer to measure ACPR for
reverse-channel CDMA. Set the center frequency to
455MHz with a +10dBm reference level and 30kHz
resolution bandwidth.
+8dBm. The ACPR at ±885kHz offset will be
approximately -64dBc, and the ACPR at ±1.98MHz
will be approximately -82dBc.
_______________________________________________________________________________________
RMS
GC
.
Adjustments and Control
GC
voltage to 2.5V and adjust the IF input
voltage until the RF output power is
RMS
RF Upconverter Evaluation
. Measure the differential
Cascaded Evaluation
VGA Adjust
P-P
The interface port is designed to use a 20-pin ribbon
cable (Figure 1); 10 pins are signal lines, and the other
10 pins are digital grounds. Pin 1 of the interface cable
is red. Pin 1 is also designated in the silk screen on
each of the PC boards.
The following section covers the EV kit’s circuit blocks
in detail (refer to the MAX2370 data sheet for additional
information).
The single-ended I/Q signals are converted to differen-
tial by operational amplifiers on the EV kit. The op amps
also provide DC bias to the I/Q input pins of the
MAX2370. The EV kits are set up to provide 130mV
differential to the IC when driven with an IS-95 forward-
modulated source set to deliver 0.9V
50Ω load.
The programming interface is provided by the INTF2300
interface board. The interface board buffers and level
shifts logic levels from the PC to the MAX2370 EV kit
(refer to the INTF2300 documentation). These logic sig-
nals control the logic pins as well as the serial interface.
The IFLO output port provides an output signal at the
IF VCO frequency with a typical -12dBm output power.
Enable the IFLO port by setting the BUF_EN bit in the
OPCTRL register.
REF is the reference frequency input to the RF and IF PLL.
The REF port is AC-coupled. Make sure the reference sig-
nal has low phase noise, similar to that of a TCXO.
Table 1. Register Settings
REGISTER NAME
I
OPCTRL[15:0]
CONFIG[15:0]
CC
RFM[17:0]
RFR[12:0]
IFM[13:0]
TEST[8:0]
IFR[10:0]
CTRL[15:0]
Detailed Description
REGISTER
SETTINGS
Programming Interface
23000
TYPICAL
4800
D03F
0C38
090F
384
384
100
DEC
DEC
HEX
DEC
HEX
HEX
HEX
DEC
Interface Control
P-P
into a matched
REGISTER
ADDRESS
I/Q Inputs
0000
0001
0010
0011
0100
0101
0110
0111
b
b
b
b
b
b
b
b
IFLO
REF
RMS