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Analog Devices Semiconductor Electronic Components Datasheet



AD6411

DECT RF Transceiver



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AD6411 pdf
a
FEATURES
Fully Compliant with DECT Specifications
Single IC DECT Radio
Integrated UHF VCO (External Resonator)
Integrated Synthesizer Supporting Extended Frequency
Allocation
Built-In Supply Regulation
Direct VCO Modulation for DECT Transmit Path
PLL-Based Demodulator
Use with Low Cost Plastic Packaged SAW Filters
Ultralow Power Design
Operates from +3.0 V to +5.5 V Battery
User-Selectable Power-Down Modes
Small 48-Lead LQFP Package
APPLICATIONS
DECT Cordless Telephones
DECT-Based Wireless Local Loop Systems
DECT-Based Wireless Data Systems
DECT RF Transceiver
AD6411
FUNCTIONAL BLOCK DIAGRAM
LNA
PA
PLL
DEMODULATOR
PLL
VCO
AD6411
PFD
CONTROL
INTERFACE
RX
DATA
RSSI
TX
DATA
DESCRIPTION
The AD6411 provides the complete transmit and receive RF
signal processing necessary to implement a digital wireless
transceiver based on the Digital Enhanced Cordless Telecom-
munications (DECT) standard.
The AD6411’s receive signal path consists of a mixer, IF ampli-
fiers and PLL demodulator. The low noise, high intercept mixer
is a development of the doubly-balanced Gilbert-Cell type. It
has a nominal –16 dBm input-referred 1 dB compression point
and a –8 dBm input referred third-order intercept. The limiter
amplifier provides sufficient gain to drive the PLL demodulator,
which provides selectable analog or sliced outputs. The RSSI
output provides a voltage proportional to the receive signal
strength. It measures nearly 100 dB IF signal strength range
with 14 mV/dB gain scaling.
The transmit path accepts baseband data, which is filtered and
applied to the VCO directly. The VCO operates at half the RF
carrier frequency, and is doubled to avoid pulling due to leakage
from the output.
An on-chip PLL frequency synthesizer provides channel selec-
tion. Operating modes are selected either through a serial bus or
asynchronous control pins. This allows compatibility with most
of the available DECT baseband controller ASICs.
The AD6411 is packaged in a 48-lead LQFP.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998



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AD6411 pdf
AD6411–SPECIFICATIONS (TA = 25؇C, 3.0 V < VBAT < 5.5 V unless otherwise noted)
Parameter
Conditions
Min Typ
Max
RECEIVE RF MIXER
RF Input Frequency
1880 to
1930
Units
MHz
Power Gain
Input 1 dB Compression Point
Input Third-Order Intercept
SSB Noise Figure
Output VSWR
Output Impedance
Input Impedance
RX IF AMPLIFIERS
Differential Input Impedance
Input VSWR
IF Noise Figure
RSSI
RSSI Upper Limit
RSSI Lower Limit
RSSI High Level Voltage
RSSI Low Level Voltage
RSSI Slope
RSSI Output Impedance
RSSI Output Response Time
PLL DEMODULATOR
PLL Demodulator Phase Detector Gain
Leakage Current at COFF
Recommended External VCO Gain
Demodulator Gain
Demodulator Linearity
VOLTAGE REFERENCE
Output Voltage
Output Current
TRANSMIT SECTION
Output Power
Harmonically Related Spurii
Other Spurii
Output Phase Noise
1.2 MHz
3.0 MHz
>4.7 MHz
VCO Operating Frequency Range
Oscillator Push
Oscillator Pull
SYNTHESIZER
Reference Input Impedance
Reference Input Level
Reference Input Frequency
VCO Signal Input Range
Charge Pump Current – “Up”
Charge Pump Current – “Down”
Charge Pump Leakage
BSW Output “High” Voltage
ZSOURCE = 50 , ZLOAD = 200
ZSOURCE = 50 , ZLOAD = 200
ZSOURCE = 50 , ZLOAD = 200
ZSOURCE = 50 , ZLOAD = 200
100 MHz–120 MHz
Input Power < –11 dBm
ZSOURCE = 200 Differential
ZSOURCE = 200 Differential
ZSOURCE = 200 Differential
Input Power = 0 dBm (at IF Input)
Input Power = –90 dBm (at IF Input)
–90 dBm < Input Power < 0 dBm (at IF Input)
VRSSI = 0.3 V
Settling to 95% Value for a 40 dB Input Step,
20 pF External Load
@ 90 Degree Relative Phase
Charge Pump Disabled
VCO Gain Set to 1.152 MHz/V
THD for FM Tone @ 576 kHz,
Peak Deviation 288 kHz
ZL = 50
At 0.5 × DECT_Tx: (940 MHz–950 MHz)
At 1.5 × DECT_Tx: (2820 MHz–2850 MHz)
100 MHz–3000 MHz, Outside DECT Band
1 MHz Measurement Bandwidth
With UHF Resonator Qu > 30
With Suitable External Resonator
Using On-Chip Regulator, 250 mV VBAT
Step Change with 5 µs Rise/Fall Time
VSWR = 2:1 Any Phase
Voltage On Loop Filter (Pin 38) = 1.4 V
Voltage On Loop Filter (Pin 38) = 1.4 V
Output Disabled
at ILOAD < = 2 mA
15
–21
–5
80
1.3
–3
700
100
10
700
–1.30
0.66
2.5
19
–16
–8
11
200
50
200
6
+3
–95
1.7
0.3
14
700
115
100
1.152
1.736
–30
1.37
+1
–10
–20
–73
–120
–130
–135
6
55
>5
1.0
1.0
<± 1
21
1.5:1
dB
dBm
dBm
dB
1.5:1
dB
dBm
dBm
V
V
mV/dB
2 µs
150 µA/rad
pA
MHz/V
V/MHz
dBc
1.44 V
100 µA
+4 dBm
dBc
dBc
dBc
1200
dBc/Hz
dBc/Hz
dBc/Hz
MHz
kHz
kHz
1000
20
1200
–0.77
1.15
k
mV p-p
MHz
MHz
mA
mA
nA
V
–2– REV. 0



Part Number AD6411
Description DECT RF Transceiver
Maker Analog Devices - Analog Devices
Total Page 11 Pages
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