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AD6623ABC データシート(PDF) 3 Page - Analog Devices

部品番号 AD6623ABC
部品情報  4-Channel, 104 MSPS Digital Transmit Signal Processor TSP
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
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AD6623ABC データシート(HTML) 3 Page - Analog Devices

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AD6623
–3–
PRODUCT DESCRIPTION
The AD6623 is a 4-channel Transmit Signal Processor (TSP)
that creates high bandwidth data for Transmit Digital-to-Analog
Converters (TxDACs) from baseband data provided by a Digital
Signal Processor (DSP). Modern TxDACs have achieved suffi-
ciently high sampling rates, analog bandwidth, and dynamic range
to create the first Intermediate Frequency (IF) directly. The
AD6623 synthesizes multicarrier and multistandard digital signals
to drive these TxDACs. The RAM-based architecture allows easy
reconfiguration for multimode applications. Modulation, pulse-
shaping and anti-imaging filters, static equalization, and tuning
functions are combined in a single, cost-effective device. Digital
IF signal processing provides repeatable manufacturing, higher
accuracy, and more flexibility than comparable high dynamic
range analog designs.
The AD6623 has four identical digital TSPs complete with synchro-
nization circuitry and cascadable wideband channel summation.
AD6623 is pin compatible to AD6622 and can operate in AD6622-
compatible control register mode.
The AD6623 utilizes a 3.3 V I/O power supply and a 2.5 V core
power supply. All I/O pins are 5 V tolerant. All control registers
and coefficient values are programmed through a generic micro-
processor interface. Intel and Motorola microprocessor bus modes
are supported. All inputs and outputs are LVCMOS compatible.
FUNCTIONAL OVERVIEW
Each TSP has five cascaded signal processing elements: a pro-
grammable interpolating RAM Coefficient Filter (RCF), a
programmable Scale and Power Ramp, a programmable fifth order
Cascaded Integrator Comb (CIC5) interpolating filter, a flexible
second order Resampling Cascaded Integrator Comb filter (rCIC2),
and a Numerically Controlled Oscillator/Tuner (NCO).
The outputs of the four TSPs are summed and scaled on-chip.
In multicarrier wideband transmitters, a bidirectional bus allows
the Parallel (wideband) IF Input/Output to drive a second DAC.
In this operational mode two AD6623 channels drive one DAC
and the other two AD6623 channels drive a second DAC. Mul-
tiple AD6623s may be combined by driving the INOUT[17:0] of
the succeeding with the OUT[17:0] of the preceding chip. The
INOUT[17:0] can alternatively be masked off by software to
allow preceding AD6623’s outputs to be ignored.
Each channel accepts input data from independent serial ports
that may be connected directly to the serial port of Digital Signal
Processor (DSP) chips.
The RCF implements any one of the following functions:
Interpolating Finite Impulse Response (FIR) filter, /4-DQPSK
modulator, 8-PSK modulator, or 3
/8-8-PSK modulator, GMSK
modulator, and QPSK modulator. Each AD6623 channel can
be dynamically switched between the GMSK modulation mode
and the 3
/8-8-PSK modulation mode in order to support the
GSM/EDGE standard. The RCF also implements an Allpass
Phase Equalizer (APE) which meets the requirements of IS-95-A/B
standard (CDMA transmission).
The programmable Scale and Power Ramp block allows power
ramping on a time-slot basis as specified for some air-interface
standards (e.g., GSM, EDGE). A fine scaling unit at the pro-
grammable FIR filter output allows an easy signal amplitude
level adjustment on time slot basis.
The CIC5 provides integer rate interpolation from 1 to 32 and
coarse anti-image filtering. The rCIC2 provides fractional rate
interpolation from 1 to 4096 in steps of 1/512. The wide range
of interpolation factors in each CIC filter stage and a highly
flexible resampler incorporated into rCIC2 makes the AD6623
useful for creating both narrowband and wideband carriers in a
high-speed sample stream.
The high resolution 32-bit NCO allows flexibility in frequency
planning and supports both digital and analog air interface stan-
dards. The high speed NCO tunes the interpolated complex signal
from the rCIC2 to an IF channel. The result may be real or com-
plex. Multicarrier phase synchronization pins and phase offset
registers allow intelligent management of the relative phase of
independent RF channels. This capability supports the require-
ments for phased array antenna architectures and management
of the wideband peak/power ratio to minimize clipping at the DAC.
The wideband Output Ports can deliver real or complex data.
Complex words are interleaved into real (I) and imaginary (Q)
parts at half the master clock rate.


同様の部品番号 - AD6623ABC

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同様の説明 - AD6623ABC

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