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ADF7901 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADF7901
Beschreibung High Performance ISM Band OOK/FSK Transmitter IC
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 13 Seiten
ADF7901 Datasheet, Funktion
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
High Performance ISM Band
OOK/FSK Transmitter IC
ADF7901
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
OSC1
OSC2
DVDD
TXDATA
FSK
R=1
PDF
CHARGE
PUMP
FRACTIONAL N
Σ-Δ
CHANNEL SELECT
VCO
PA_EN
CREG2
CVCO
VDD
RFOUT
PA
RFGND
LDO
REGULATOR
1
LDO
REGULATOR
2
CREG1
CREG2
RSET
CE
DGND
FSK1 FSK2 FSK3
OOK_SEL
RSET_FSK
Figure 1.
RSET_OOK
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.






ADF7901 Datasheet, Funktion
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.1
Table 2.
Parameter
VDD to GND2
RFVDD to GND
Digital I/O Voltage to GND
Operating Temperature Range
Industrial (B Version)
Storage Temperature Range
Maximum Junction Temperature
TSSOP θJA Thermal Impedance
Lead Temperature, Soldering
Vapor Phase (60 sec)
Infrared (15 sec)
Value
−0.3 V to +4.0 V
−0.3 V to +4.0 V
−0.3 V to VDD + 0.3 V
0°C to 50°C
−65°C to +125°C
125°C
150.4°C/W
235°C
240°C
1 This device is a high performance, RF-integrated circuit with an ESD rating
of <1 kV. It is ESD sensitive. Take proper precautions for handling and
assembly.
2 GND = RFGND = DGND = 0 V.
ADF7901
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. A| Page 5 of 12

6 Page









ADF7901 pdf, datenblatt
OUTLINE DIMENSIONS
7.90
7.80
7.70
24 13
4.50
4.40
4.30
6.40 BSC
1 12
PIN 1
0.65
BSC
0.15
0.05
0.30
0.19
0.10 COPLANARITY
1.20
MAX
SEATING 0.20
PLANE
0.09
COMPLIANT TO JEDEC STANDARDS MO-153AD
0.75
0.60
0.45
Figure 9. 24-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-24)
Dimensions shown in millimeters
ADF7901
ORDERING GUIDE
Model
ADF7901BRU
ADF7901BRU-REEL
ADF7901BRU-REEL7
ADF7901BRUZ1
ADF7901BRUZ-RL1
ADF7901BRUZ-RL71
EVAL-ADF7901EB
1 Z = Pb-free part.
Temperature Range
0°C to 50°C
0°C to 50°C
0°C to 50°C
0°C to 50°C
0°C to 50°C
0°C to 50°C
Package Description
24-Lead Thin Shrink Small Outline Package (TSSOP)
24-Lead Thin Shrink Small Outline Package (TSSOP)
24-Lead Thin Shrink Small Outline Package (TSSOP)
24-Lead Thin Shrink Small Outline Package (TSSOP)
24-Lead Thin Shrink Small Outline Package (TSSOP)
24-Lead Thin Shrink Small Outline Package (TSSOP)
Evaluation Board
Package Option
RU-24
RU-24
RU-24
RU-24
RU-24
RU-24
Rev. A| Page 11 of 12

12 Page





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