AD6411AST Analog Devices, AD6411AST Datasheet

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AD6411AST

Manufacturer Part Number
AD6411AST
Description
Manufacturer
Analog Devices
Datasheet
a
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.
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.
FEATURES
Fully Compliant with DECT Specifications
Single IC DECT Radio
Integrated UHF VCO (External Resonator)
Integrated Synthesizer Supporting Extended Frequency
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
Allocation
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
PA
LNA
FUNCTIONAL BLOCK DIAGRAM
World Wide Web Site: http://www.analog.com
DECT RF Transceiver
AD6411
VCO
PLL
© Analog Devices, Inc., 1998
DEMODULATOR
INTERFACE
CONTROL
PLL
AD6411
PFD
RX
DATA
RSSI
TX
DATA

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AD6411AST Summary of contents

Page 1

... It measures nearly 100 dB IF signal strength range with 14 mV/dB gain scaling. 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 ...

Page 2

AD6411–SPECIFICATIONS Parameter RECEIVE RF MIXER RF Input Frequency 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 ...

Page 3

... Package Model Range Description AD6411AST – +85 C 48-Lead Plastic LQFP ST-48 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 the AD6411 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 4

AD6411 Pin No. Label Description 1 REF DECT Reference Clock Input 2 SFS S-Field Sample 3 DEMOD_DATA Demodulator Output OR Sliced Demodulator Output 4 TX_ENAB Transmit Section Power Control Input 5 COFF Demodulator Offset Capacitor 6 DMR Input for IF ...

Page 5

L2 VCC SAW C14 BPF1 LNA BPF2 VCC BSW TXDATA AD6411 R6 PRODUCT OVERVIEW The AD6411 provides most of the active circuitry required to realize a complete low power DECT transceiver. Figure 1 shows the ...

Page 6

AD6411 VCC 150nH 6.8pF 8pF TC1 IFVCO IF/110.592MHz The block diagram shows the principle of operation of these two modes together with the internal switch settings as shown in Figure 2. Table I. Supported Demodulation Modes Mode SW1 SW2 SW3 ...

Page 7

Transmit DECT Channel A Counter M Counter The A Counter ...

Page 8

AD6411 One-Time Setup Register Bit Definitions RSB: Receive Control Line Sense Bit RSB Function 0 Receive Section POWER UP Active HIGH 1 Receive Section POWER UP Active LOW TSB: Transmit Control Line Sense Bit TSB Function 0 Transmit Section POWER ...

Page 9

CONTROLLING THE AD6411 OPERATING MODE Table IV. Operating Mode Control Register D15 D14 D13 D12 D11 D10 DMOD DIV CP TX UHF BUF VCO The operating mode register, loaded ...

Page 10

... VCO to the DECT band. Tank com- ponent values will need slight modification to cover the “ex- tended DECT” frequency bands. The dimensions of tank inductor L1 will depend on the circuit board material and thick- ness used. Contact Analog Devices for assistance on UHF tank inductor layout. VCCVCO VCOB ...

Page 11

REV. 0 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 48-Lead Plastic LQFP (ST-48) 0.362 (9.2) SQ 0.346 (8.8) 0.280 (7.10) 0.063 (1.60) MAX SQ 0.272 (6.90) 0.020 (0.52) 0.019 (0.48 SEATING PLANE TOP VIEW (PINS DOWN) 0.006 ...

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