Datasheet

MAX2900–MAX2904
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
8
Maxim Integrated
Pin Description
PIN
MAX2900
MAX2901
MAX2903
MAX2902
MAX2904
NAME PIN TYPE FUNCTION
1 1 1 VTUNE Analog Input VCO tuning voltage input
2 2 2 GND Supply Pin Ground
3 3 3 VREG
Analog
Input/Output
Regulated voltage output to supply the VCO.
Bypass with a 0.01µF capacitor to GND as
close to the part as possible.
4 4 4 VCC1 Supply Pin
Power supply pin for VCO circuits. Bypass
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
Resistor to ground on this pin sets the
modulation filter bandwidth.
6 6 6 EN Digital Input
Chip-enable digital input pin. Set EN low
maintain the chip in power-down mode.
7 7 7 REFEN Digital Input
Enable for crystal oscillator and frequency
reference buffer.
8 8 8 MODIN Digital Input BPSK modulation input
9 9 9 OOKIN Digital Input On-off keying modulation. On state = high.
10 10 10 VCC2 Supply
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.
11 11 11 VASK
Analog Voltage
Input
ASK voltage input pin
12 12 — LD Digital Output
Lock detector output digital pin. Level is
high when PLL is inside lock range.
— — 12 D.C. Do NOT Connect —
13 13 13 PWRSET
Anal og Inp ut
Resi stor to Gr ound
Current input set to adjust output power.
14 14 14 VCC3 Supply
P ow er sup p l y p i n for RF p ow er am p l i fi er
ci r cui ts. Byp ass w i th a 100p F cap aci tor to GN D
as cl ose to the p ar t as p ossi b l e.