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PDF ( 数据手册 , 数据表 ) AD7011

零件编号 AD7011
描述 CMOS/ ADC p/4 DQPSK Baseband Transmit Port
制造商 Analog Devices
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AD7011 数据手册, 描述, 功能
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 pdf, 数据表
AD7011
TERMINOLOGY
Error Vector Magnitude
This is a measure of the rms error vector introduced by the
AD7011 where signal error vector is defined as the rms devia-
tion of a transmitted symbol from its ideal position when filtered
by an Ideal RRC Receive filter, as illustrated in Figure 8.
Gain Matching Between Channels
The is the gain matching between the I and Q outputs, measured
when transmitting all zeros.
Offset Vector Magnitude
This is a measure of the offset vector introduced by the AD7011
as illustrated in Figure 8. The offset vector is calculated so as to
minimize the rms error vector for each of the constellation
points.
Output Signal Range and Different Output Range
The output signal range is the output voltage swing and dc bias
level for each of the analog outputs. The different output range
is the difference between ITx and ITx for the I channel and the
difference between QTx and QTx for the Q Channel.
IS-54 Spurious Power
This is the rms sum of the spurious power measured at multiples
of 30 kHz, in a root raised cosine window of ± 16.4 kHz, relative
to twice the rms power in a RRC window in the 0 to 16.4 kHz
band.
Signal Vector Magnitude
This is the radius of the IQ constellation diagram as illustrated
in Figure 8.
Signal to (Noise + Distortion) Ratio
This is the measured ratio of signal to (noise + distortion) at the
output of the transmit I and Q DACs. The signal is the rms
amplitude of the fundamental. Noise is the rms sum of all non-
fundamental signals up to half the sampling frequency (fS/2),
excluding dc. The ratio is dependent upon the number of
quantization levels in the digitization process; the more levels,
the smaller the quantization noise. The theoretical signal to
(noise distortion) ratio for a sine wave is given by:
SNR = (6.02N + 1.76) dB
where N is the number of bits. Thus for an ideal 10-bit con-
verter, SNR = 61.96 dB.
Q
ERROR VECTOR
OFFSET
VECTOR
SIGNAL VECTOR
I
0,0
Figure 8.
–8– REV. B














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