200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
MAX2900–MAX2904
Pin Description
MAX2900
1
2
3
PIN
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
with a 1000pF and a 10µF capacitor to GND
as close to the part as possible.
4
4
4
VCC1
Supply Pin
5
6
7
8
9
5
6
7
8
9
5
6
7
8
9
RLPF
EN
REFEN
MODIN
OOKIN
Resistor to ground on this pin sets the
Analog Input
Resistor to Ground modulation filter bandwidth.
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
circuits. Bypass with a 100pF and a 0.01µF
capacitor to GND as close to the part as
possible.
ASK voltage input pin
Lock detector output digital pin. Level is
high when PLL is inside lock range.
10
10
10
VCC2
Supply
11
12
—
13
11
12
—
13
11
—
12
13
VASK
LD
D.C.
PWRSET
Analog Voltage
Input
Digital Output
Do NOT Connect —
Analog Input
Current input set to adjust output power.
Resistor to Ground
Supply
Power supply pin for RF power amplifier
circuits. Bypass with a 100pF capacitor to GND
as close to the part as possible.
14
14
14
VCC3
8
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