ADF7012 Datasheet, PDF (1/28 Pages) Analog Devices – Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter

Multichannel ISM Band
FSK/GFSK/OOK/GOOK/ASK Transmitter
ADF7012
FEATURES
Single-chip, low power UHF transmitter
75 MHz to 1 GHz frequency operation
Multichannel operation using Frac-N PLL
2.3 V to 3.6 V operation
On-board regulator—stable performance
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
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
Wireless metering
Secure keyless entry
GENERAL DESCRIPTION
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.
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.
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.
A simple 3-wire interface controls the registers. In power-down,
the part has a typical quiescent current of <0.1 μA.
OSC1
OSC2
FUNCTIONAL BLOCK DIAGRAM
PRINTED
INDUCTOR
C_REG
CLK_OUT CPV_DD CP_GND
L1
L2
C_VCO
DV_DD
D_GND
TxCLK
÷CLK
÷R
OOK\ASK
PFD/
CHARGE
PUMP
+FRACTIONAL N
VCO
OOK\ASK
PA
V_DD
RF_OUT
RF GND
LDO
REGULATOR
C_REG
TxDATA
LE
DATA
CLK
FSK\GFSK
SERIAL
INTERFACE
FREQUENCY
COMPENSATION
CENTER
FREQUENCY
CE
Σ-∆
A_GND
Figure 1.
PLL LOCK
DETECT
BATTERY
MONITOR
MUXOUT
MUXOUT
R_SET
Rev. 0
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