Multichannel ISM Band
FSK/GFSK/OOK/GOOK/ASK Transmitter
ADF7012
FEATURES
GENERAL DESCRIPTION
Single-chip, low power UHF transmitter
75 MHz to 1 GHz frequency operation
Multichannel operation using fractional-N PLL
2.3 V to 3.6 V operation
The ADF7012 is a low power FSK/GFSK/OOK/GOOK/ASK
UHF transmitter designed for short-range devices (SRDs). The
output power, output channels, deviation frequency, and mod-
ulation type are programmable by using four, 32-bit registers.
On-board regulator
The fractional-N PLL and VCO with external inductor enable
the user to select any frequency in the 75 MHz to 1 GHz band.
The fast lock times of the fractional-N PLL make the ADF7012
suitable in fast frequency hopping systems. The fine frequency
deviations available and PLL phase noise performance facilitates
narrow-band operation.
Programmable output power
−16 dBm to +14 dBm, 0.4 dB steps
Data rates: dc to 179.2 kbps
Low current consumption
868 MHz, 10 dBm, 21 mA
433 MHz, 10 dBm, 17 mA
There are five selectable modulation schemes: binary frequency
shift keying (FSK), Gaussian frequency shift keying (GFSK),
binary on-off keying (OOK), Gaussian on-off keying (GOOK),
and amplitude shift keying (ASK). In the compensation register,
the output can be moved in <1 ppm steps so that indirect com-
pensation for frequency error in the crystal reference can be made.
315 MHz, 0 dBm, 10 mA
Programmable low battery voltage indicator
24-lead TSSOP
APPLICATIONS
Low cost wireless data transfer
Security systems
RF remote controls
A simple 3-wire interface controls the registers. In power-down,
the part has a typical quiescent current of <0.1 μA.
Wireless metering
Secure keyless entry
FUNCTIONAL BLOCK DIAGRAM
PRINTED
INDUCTOR
CLK
OUT
C
VCO
OSC1
OSC2
L1
L2
V
DD
OOK\ASK
PA
÷CLK
VCO
RF
RF
OUT
÷R
PFD/
CHARGE
PUMP
GND
DV
DD
DGND
C
REG
LDO
REGULATOR
+FRACTIONAL N
OOK\ASK
FSK\GFSK
TxCLK
Σ-Δ
TxDATA
PLL LOCK
DETECT
MUXOUT
LE
DATA
CLK
FREQUENCY
COMPENSATION
MUXOUT
SERIAL
INTERFACE
R
SET
BATTERY
MONITOR
CENTER
FREQUENCY
CE
AGND
Figure 1.
Rev. A
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