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參數(shù)資料
| 型號： | MAX2370_1 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Evaluation Kit |
| 中文描述： | 評估板 |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 865K |
| 代理商： | MAX2370_1 |
E
RF Upconverter Evaluation
1) Connect a CDMA RF signal generator to the IFIN
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.
2) Connect RFL to the spectrum analyzer. Configure
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.
3) Set the V
GC
voltage to 2.5V and adjust the IF input
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.
Cascaded Evaluation
1) Connect the CDMA baseband signal generator to
the I and Q ports using BNC connectors. Set the
modulation to reverse-channel CDMA at a 780mV
P-P
output level. The nominal input level at the IC
’
s I/Q
input pins is 130mV
RMS
. Measure the differential
voltage at the chip
’
s I/Q inputs and adjust the signal
generator
’
s output if necessary to achieve
130mV
RMS
.
2) Connect an external 120MHz bandpass filter
between the IFOUT and IFIN ports of the MAX2370
evaluation kit. A 50
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.
3) Connect RFL to the spectrum analyzer. Configure
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.
4) Adjust the V
GC
voltage until the RF output power is
+8dBm. The ACPR at ±885kHz offset will be
approximately -64dBc, and the ACPR at ±1.98MHz
will be approximately -82dBc.
Adjustments and Control
VGA Adjust
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.
Interface Control
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.
Detailed Description
The following section covers the EV kit
’
s circuit blocks
in detail (refer to the MAX2370 data sheet for additional
information).
I/Q Inputs
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
RMS
differential to the IC when driven with an IS-95 forward-
modulated source set to deliver 0.9V
P-P
into a matched
50
load.
Programming Interface
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.
IFLO
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
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.
MAX2370 Evaluation Kit
4
_______________________________________________________________________________________
Table 1. Register Settings
REGISTER NAME
TYPICAL
REGISTER
SETTINGS
23000
DEC
384
DEC
4800
DEC
384
DEC
090F
HEX
D03F
HEX
0C38
HEX
100
HEX
REGISTER
ADDRESS
RFM[17:0]
RFR[12:0]
IFM[13:0]
IFR[10:0]
OPCTRL[15:0]
CONFIG[15:0]
I
CC
CTRL[15:0]
TEST[8:0]
0000
b
0001
b
0010
b
0011
b
0100
b
0101
b
0110
b
0111
b
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