MAX2900–MAX2904
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
9
Maxim Integrated
Pin Description (continued)
PIN
MAX2900
MAX2901
MAX2903
MAX2902
MAX2904
NAME PIN TYPE FUNCTION
15 15 15 GND Supply Pin Ground
16, 17 16, 17 16, 17 RF-, RF+ RF Output RF d i ffer enti al outp ut, op en- col l ector typ e
18 — — N.C. Not Connected —
— 18 — GND Supply Pin Ground
— — 18 D.C. Do Not Connect —
19 — 19 N.C. Not Connected —
— 19 — DIVOUT ECL Output Divider output
— 20, 21 20, 21 VCO-, VCO+
Open Collector
RF
VCO output (differential)
20 — — D1 Digital Input Channel selection bit 1
21 — — D0 Digital Input Channel selection bit 0
22 22 22 OSC Analog Input
Crystal oscillator connection. See Typical
Operating Circuit.
23 23 23 REFIN
Analog Voltage
Input
Refer ence i np ut p i n anal og ( can b e used as
i np ut or as cr ystal osci l l ator d r i ver ) . See
Typical Operating Circuit.
24 24 — VCC4 Supply Pin
Power-supply pin for the synthesizer circuits.
Bypass with a 1000pF capacitor to GND as
close to the part as possible.
— — 24 VCC4 Supply Pin
Power-supply pin for the digital circuits.
Bypass with a 100pF capacitor to GND as
close to the part as possible.
25 25 25 REFOUT Analog Output Buffered clock analog output pin
26 — — D2 Digital Input Channel selection bit 2
— 26 — DIV63 Digital Input
Division ratio selections (division ratio = 62
when DIV63 = high; division
ratio = 63 when DIV63 = low).
— — 26 N.C. Not Connected —
27 27 — VCC5 Supply Pin
Power-supply pin for charge pump circuits.
Bypass with a 100pF capacitor to GND as
close to the part as possible.
— — 27 VCC5 Supply Pin
Power-supply pin. Bypass with a 100pF
capacitor to GND as close to the part as
possible.
28 28 — CPOUT Analog Output Charge pump output pin
— — 28 D.C. Do Not Connect —
GROUND GROUND GROUND GROUND
Electrical
Ground
Back side of package is connected to
ground.
