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ADF7011
High Performance ISM Band
ASK/FSK/GFSK Transmitter IC
FEATURES
Single Chip Low Power UHF Transmitter
Frequency Band
433 MHz to 435 MHz
868 MHz to 870 MHz
On-Chip VCO and Fractional-N PLL
2.3 V to 3.6 V Supply Voltage
Programmable Output Power
–16 dBm to +12 dBm, 0.3 dB Steps
Data Rates up to 76.8 kbps
Low Current Consumption
29 mA at +10 dBm at 433.92 MHz
Power-Down Mode (<1 H9262A)
24-Lead TSSOP Package Hooks to External VCO for
< 1.4 GHz Operation
APPLICATIONS
Low Cost Wireless Data Transfer
Wireless Metering
Remote Control/Security Systems
Keyless Entry
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The ADF7011 is a low power OOK/ASK/FSK/GFSK UHF
transmitter designed for use in ISM band systems. It contains
and integrated VCO and Σ-∆ fractional-N PLL. The output
power, channel spacing, and output frequency are program-
mable with four 24-bit registers. The fractional-N PLL enables
the user to select any channel frequency within the European
433 MHz and 868 MHz bands, allowing the use of the ADF7011
in frequency hopping systems. The fractional-N also allows the
transmitter to operate in the less congested sub-bands of the
868 MHz to 870 MHz SRD band.
It is possible to choose from the four different modulation
schemes: Binary or Gaussian Frequency Shift Keying (FSK/
GFSK), Amplitude Shift Keying (ASK), or On/Off Keying
(OOK). The device also features a crystal compensation register
that can provide ±1 ppm resolution in the output frequency.
Indirect temperature compensation of the crystal can be accom-
plished inexpensively using this register.
Control of the four on-chip registers is via a simple 3-wire inter-
face. The devices operate with a power supply ranging from
2.3 V to 3.6 V and can be powered down when not in use.
VCO
OOK/ASK
LDO
REGULATOR
MUXOUT
LOCK DETECT
SERIAL
INTERFACE
FREQUENCY
COMPENSATION
CENTER
FREQUENCY
H11548 FRACTIONAL-N
SIGMA-DELTA
OOK/ASK
PFD/
CHARGE
PUMP
H11548 R
H11548 CLK
PA
FSK/GFSK
OSC1 OSC2
CLK
OUT
CPV
DD
CP
GND
C
REG
C
VCO
VCO
GND
V
DD
RF
OUT
RF
GND
C
REG
R
SET
MUXOUT
TESTA
GND
CE
CLK
DATA
LE
TxDATA
TxCLK
D
GND
DV
DD
CP
OUT
VCO
IN
ADF7011