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ADF7901BRU-REEL7 Datasheet(PDF) 1 Page - Analog Devices

Part # ADF7901BRU-REEL7
Description  High Performance ISM Band OOK/FSK Transmitter IC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADF7901BRU-REEL7 Datasheet(HTML) 1 Page - Analog Devices

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High Performance ISM Band
OOK/FSK Transmitter IC
ADF7901
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
Single-chip, low power UHF transmitter
369.5 MHz to 395.9 MHz frequency operation using
fractional-N PLL and fully integrated VCO
3.0 V supply voltage
Data rates up to 50 kbps supported
Low current consumption
26 mA at 12 dBm output at 384 MHz
Power-down mode (<1 μA)
24-lead TSSOP
GENERAL DESCRIPTION
The ADF7901 is a low power OOK/FSK UHF transmitter
designed for use in RF remote control devices. It is capable of
frequency shift keying (FSK) modulation on eight different
channels, selectable by three external control lines. OOK
modulation is performed by modulating the PA control line.
The on-chip VCO operates at 2× the output frequency. The
division by 2 at the output of the VCO reduces the amount of
PA feedthrough. As a result, OOK modulation depths of greater
than 50 dB are easily achievable.
The FSK_ADJ and ASK_ADJ resistors can be adjusted in the
system to optimize output power for each modulation scheme.
An additional 1.5 dB of output power is provided for the lower
bank of channels to adjust for antenna performance. The CE
line allows the transmitter to be powered down completely.
In this mode, the leakage current is typically 0.1 μA.
FUNCTIONAL BLOCK DIAGRAM
R = 1
FSK
DVDD
TXDATA
CE
DGND
FSK1
OOK_SEL
RFOUT
RFGND
VDD
RSET
OSC2
CVCO
CREG2
PA_EN
RSET_FSK
RSET_OOK
OSC1
PA
CREG2
CREG1
LDO
REGULATOR
1
LDO
REGULATOR
2
PDF
CHARGE
PUMP
⎟ FRACTIONAL N
Σ-Δ
FSK2 FSK3
CHANNEL SELECT
VCO
Figure 1.


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