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Teilenummer | AD7011 |
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Beschreibung | CMOS/ ADC p/4 DQPSK Baseband Transmit Port | |
Hersteller | Analog Devices | |
Logo | ||
Gesamt 12 Seiten a
FEATURES
Single +5 V Supply
On-Chip /4 DQPSK Modulator
Modulator Bypass Analog Mode
Root-Raised Cosine Tx Filters, ␣ = 0.35
Two 10-Bit D/A Converters
4th Order Reconstruction Filters
Differential Analog Outputs
On-Chip Ramp Up/Down Power Control
On-Chip Tx Offset Calibration
Dual Mode Operation, Analog and Digital
Very Low Power Dissipation, 30 mW typical
Power Down Mode < 10 A
On-Chip Voltage Reference
24-Pin SSOP
APPLICATIONS
American Digital Cellular Telephony
American Analog Cellular Telephony
CMOS, ADC /4 DQPSK
Baseband Transmit Port
AD7011
GENERAL DESCRIPTION
The AD7011 is a complete low power, CMOS, π/4 DQPSK
modulator with single +5 V power supply. The part is designed
to perform the baseband conversion of I and Q transmit wave-
forms in accordance with the American Digital Cellular Tele-
phone system (TIA IS-54).
The on-chip π/4 Differential Quadrature Phase Shift Keying
(DQPSK) digital modulator, which includes the root raised
cosine filters, generates I and Q data in response to the transmit
data stream. The AD7011 also contains ramp control envelope
logic to shape the I and Q output waveforms when ramping up
or down at the beginning or end of a transmit burst.
Besides providing all the necessary logic to perform π/4 DQPSK
modulation, the part also provides reconstruction filters to
smooth the DAC outputs, providing continuous time analog
outputs. The AD7011 generates differential analog outputs for
both the I and Q signals.
As it is a necessity for all digital mobile systems to use the lowest
possible power, the device has transmit and receive power-down
options. The AD7011 is housed in a space efficient 24-pin
SSOP (Shrink Small Outline Package).
MCLK
BIN (Q DATA)
Tx DATA (I DATA)
Tx CLK (FRAME)
READY
POWER
FUNCTIONAL BLOCK DIAGRAM
DGND
VDD
VAA
AGND
I
ANALOG MODE
SERIAL
INTERFACE Q
π /4 DQPSK
DIGITAL
MODULATOR
I
Q
MODULATOR
BYPASS
10-BIT
I-DAC
10-BIT
Q-DAC
RECONSTRUCTION
FILTERS
ITx
ITx
CALIBRATION CIRCUITRY
RECONSTRUCTION
FILTERS
QTx
QTx
AD7011
2.46V
REFERENCE
BOUT
BYPASS MODE1 MODE2
REV. B
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: 617/329-4700
Fax: 617/326-8703
AD7011
ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C unless otherwise noted)
VDD Tx, VDD Rx to AGND . . . . . . . . . . . . . . . –0.3 V to +7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V
Digital I/O Voltage to DGND . . . . . . . –0.3 V to VDD + 0.3 V
Analog I/O Voltage to AGND . . . . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . –65°C to + 150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +150°C
SSOP θJA Thermal Impedance . . . . . . . . . . . . . . . . +122°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and 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.
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 device 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.
WARNING!
ESD SENSITIVE DEVICE
ORDERING GUIDE
Model
Temperature Range Package Description
Package Option
AD7011ARS –40°C to +85°C
Shrink Small Outline Package RS-24
SSOP PIN CONFIGURATION
POWER 1
24 BOUT
BIN (QDATA) 2
TxCLK (FRAME) 3
23 AGND
22 NC
TxDATA (IDATA) 4
21 QTx
VDD 5
20 QTx
DGND 6 AD7011 19 VAA
TOP VIEW
MCLK 7 (Not to Scale) 18 AGND
NC 8
17 ITx
MODE1 9
16 ITx
NC 10
15 NC
MODE2 11
14 AGND
READY 12
13 BYPASS
NC = NO CONNECT
–6– REV. B
6 Page AD7011
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
24-Lead SSOP (RS-24)
24
PIN 1
1
13
0.212 (5.38)
0.205 (5.207)
0.311 (7.9)
0.301 (7.64)
12
0.328 (8.33)
0.318 (8.08)
0.07 (1.78)
0.066 (1.67)
0.008 (0.203)
0.002 (0.050)
0.0256 (0.65)
BSC
0.009 (0.229)
0.005 (0.127)
8°
0°
0.037 (0.94)
0.022 (0.559)
1. LEAD NO. 1 IDENTIFIED BY A DOT.
2. LEADS WILL BE EITHER TIN PLATED OR SOLDER DIPPED
IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS
–12–
REV. B
12 Page | ||
Seiten | Gesamt 12 Seiten | |
PDF Download | [ AD7011 Schematic.PDF ] |
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