Datasheet
Connections and Setup
This section provides step-by-step instructions for get-
ting the EV kits up and running in all operation modes.
1) Verify that shunts JU1, JU2, JU4, JU6, JU7, and
JU9 are in place.
2) Set the power supply to +4V and turn it off.
3) Set the adjustable power supply to +2.1V and turn it off.
4) Connect the ground terminal to GND.
5) Connect the positive +4.0V terminal to VCC.
6) Connect the positive terminal of the adjustable
power supply to VASK.
7) Set the IF generator to 14.56MHz and set the output
level to 200mV. Keep the IF generator output off.
8) Use an SMA cable to connect the output of the IF
generator to the REFIN on the MAX2900–MAX2904
EV kits.
9) Use an SMA cable to connect the RFOUT to the
input of the spectrum analyzer.
10) Set the spectrum analyzer to view the output.
11) Turn on all power supplies and enable the signal
generator.
12) Measure the supply current.
13) Observe the RF output frequency displayed on the
spectrum analyzer.
14) Measure the RF output power.
15) The RF output power should be approximately
23dBm after accounting for cable and connector loss.
Adjustments and Control
Operation Modes
The EV kits support four modes of operation:
• SHUTDOWN mode—EN = REFEN = low. (Shunt
pins 2 and 3 of JU1, JU2).
• SYNTH mode—EN = REFEN = high, OOKIN = low.
(Shunt pins 1 and 2 of JU1, JU2; shunt pins 2 and 3 of JU4).
• TRANSMIT mode—EN = REFEN = OOKIN = high.
(Shunt pins 1 and 2 of JU1, JU2, JU4).
• REFERENCE only mode—REFEN = high, EN = low.
(Shunt pins 2 and 3 of JU1. Shunt pins 1 and 2 of JU2).
See Table 1 for jumper selection.
Modulations
The IC supports various modulation modes:
• BPSK is obtained through the MODIN pin (JU3).
• OOK is obtained digitally with the OOKIN pin (JU4).
• ASK is obtained through the VASK pin.
• FM is imposed on the VCO or the reference.
Synthesizer Programming
(MAX2900/MAX2901/MAX2903)
The three pins D0, D1, D2 (JU6, JU7, and JU9) are
used as digital entries to program the synthesizer divi-
sion ratios (MAX2900). For MAX2901/MAX2903, pin
DIV63 (JU9) is used to select the division ratio of 62 or
63. Refer to the MAX2900–MAX2904 data sheet for cor-
responding division ratios.
Modulation Filter and Power Management
The RLPF input controls the modulation filter center fre-
quency. Pins PWRSET and VASK are analog inputs
Evaluate: MAX2900–MAX2904
MAX2900–MAX2904 Evaluation Kits
_______________________________________________________________________________________ 7
JUMPER
MAX2900
MAX2901/
MAX2903
MAX2902/
MAX2904
NAME DESCRIPTION
1 1 1 EN Chip Enable
2 2 2 REFEN Reference Enable
3 3 3 MODIN BPSK Modulation Input
4 4 4 OOKIN OOK Modulation Input
6/7 ——D0/D1 Digital Synthesizer Programming Input
— 6/7 6/7 VCO+/ VCO- VCO Output
8 8 8 REFOUT REF Output
9 ——D2 Digital Synthesizer Programming Input
— 9 — DIV63 Digital Synthesizer Programming Input
—— 9 N.C. Not Connected
Table 1. Jumper Description