
MAX2900–MAX2904
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
Pin Description
PIN
MAX2900
1
2
3
MAX2901
MAX2903
1
2
3
MAX2902
MAX2904
1
2
3
NAME
VTUNE
GND
VREG
PIN TYPE
Analog Input
Supply Pin
Analog
Input/Output
FUNCTION
VCO tuning voltage input
Ground
Regulated voltage output to supply the VCO.
Bypass with a 0.01μF capacitor to GND as
close to the part as possible.
Power supply pin for VCO circuits. Bypass
4
4
4
VCC1
Supply Pin
with a 1000pF and a 10μF capacitor to GND
as close to the part as possible.
5
5
5
RLPF
Analog Input Resistor to ground on this pin sets the
Resistor to Ground modulation filter bandwidth.
6
7
8
9
6
7
8
9
6
7
8
9
EN
REFEN
MODIN
OOKIN
Digital Input
Digital Input
Digital Input
Digital Input
Chip-enable digital input pin. Set EN low
maintain the chip in power-down mode.
Enable for crystal oscillator and frequency
reference buffer.
BPSK modulation input
On-off keying modulation. On state = high.
Power supply pin for internal RF buffer
10
10
10
VCC2
Supply
circuits. Bypass with a 100pF and a 0.01μF
capacitor to GND as close to the part as
possible.
11
12
11
12
11
—
VASK
LD
Analog Voltage
Input
Digital Output
ASK voltage input pin
Lock detector output digital pin. Level is
high when PLL is inside lock range.
—
—
12
D.C.
Do NOT Connect —
13
13
13
PWRSET
Analog Input
Resistor to Ground
Current input set to adjust output power.
Power supply pin for RF power amplifier
14
14
14
VCC3
Supply
circuits. Bypass with a 100pF capacitor to GND
as close to the part as possible.
8
Maxim Integrated