ADF7901
器件描述：High Performance ISM Band ASK/FSK Transmitter IC
器件厂商：AD [Analog Devices]
文件大小：285.01KB，共12页
Sponsor by e络盟器件资料摘要：
High Performance ISM Band
ASK/FSK Transmitter IC
Preliminary Technical Data
ADF7901
Rev. PrD
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: 781.326.8703 © 2005 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 supported < 2.5 kbps
Low current consumption 26 mA at 12 dBm
Output at 384 MHz
Power-down mode (< 1 µA)
24-Lead TSSOP package
GENERAL DESCRIPTION
The ADF7901 is a low power OOK/FSK UHF transmitter
designed for use in RF Remote Control Devices. The device
is capable of Frequency Shift Keying (FSK) modulation on
8 different channels, selectable by 3 external control lines. OOK
modulation is performed by modulating the PA control line.
The on-chip VCO operates at 2 × the output frequency. The
divide by 2 at the output of the VCO reduces the amount of PA
feedthrough. As a result of this, 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
DV
DD
TXDATA
CE D
GND
FSK1 OOK_SEL
RF
OUT
RF
GND
V
DD
RSET
OSC2
C
VCO
C
REG2
PA_EN
RSET_FSK
RSET_OOK
OSC1
PA
C
REG
2
C
REG1LDO
REGULATOR
#1
LDO
REGULATOR
#2
PDF
CHARGE
PUMP
÷ FRACTIONAL N
SIGMA-DELTA
FSK2 FSK3
CHANNEL SELECT
VCO
01975-001
Figure 1.
ASK/FSK Transmitter IC
Preliminary Technical Data
ADF7901
Rev. PrD
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: 781.326.8703 © 2005 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 supported < 2.5 kbps
Low current consumption 26 mA at 12 dBm
Output at 384 MHz
Power-down mode (< 1 µA)
24-Lead TSSOP package
GENERAL DESCRIPTION
The ADF7901 is a low power OOK/FSK UHF transmitter
designed for use in RF Remote Control Devices. The device
is capable of Frequency Shift Keying (FSK) modulation on
8 different channels, selectable by 3 external control lines. OOK
modulation is performed by modulating the PA control line.
The on-chip VCO operates at 2 × the output frequency. The
divide by 2 at the output of the VCO reduces the amount of PA
feedthrough. As a result of this, 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
DV
DD
TXDATA
CE D
GND
FSK1 OOK_SEL
RF
OUT
RF
GND
V
DD
RSET
OSC2
C
VCO
C
REG2
PA_EN
RSET_FSK
RSET_OOK
OSC1
PA
C
REG
2
C
REG1LDO
REGULATOR
#1
LDO
REGULATOR
#2
CHARGE
PUMP
÷ FRACTIONAL N
SIGMA-DELTA
FSK2 FSK3
CHANNEL SELECT
VCO
01975-001
Figure 1.