參數(shù)資料
型號(hào)： AD1954
廠商： Analog Devices, Inc.
英文描述： CONNECTOR COAXIAL BNC
中文描述： SigmaDSP的⑩3通道，26位DAC的信號(hào)處理
文件頁(yè)數(shù)： 13/36頁(yè)
文件大?。?/td> 1470K
代理商： AD1954
AD1954
–13–
0 dB and 1/0.75 (approximately 3 dB) will produce larger analog
outputs and result in slightly degraded analog performance. This
extra analog range is necessary in order to pass 0 dBFS square
waves through the system, since these square waves cause over-
shoots in the interpolation filters, which would otherwise briefly
clip the digital DAC circuitry.
A separate digital clipper circuit is used in the DSP core to ensure
that any accumulator values that exceed the numeric 3.23 format
range are clipped when taken from the accumulator.
High-Pass Filter
The high-pass filter is a first order double-precision design. The pur-
pose of the high-pass filter is to remove digital dc from the input. If
this dc were allowed to pass, the detectors used in the compres or/
limiter would give an incorrect reading for low signal levels. The
high-pass filter is controlled by a single parameter (alpha_HPF),
which is programmed by writing to SPI location 180 in 2.20 twos
complement format. The following equation can be used to calcu-
late the parameter alpha_HPF from the –3 dB point of the filter:
Alpha_HPF
– EXP
p
HPF_Cutoff
f
S
=
×
×
1.0
–2.0
where
is the exponential operator,
EXP
pass cutoff in Hz, and
f
f
is the audio sampling rate. The default
S
value for the –3 dB cutoff of the high-pass filter is 2.75 Hz at a
sampling rate of 44.1 kHz.
Biquad Filters
Each of the two input channels has seven second order biquad
sections in the signal path. In addition, the left and right channels
have two additional biquad filters that may be used either as
crossover filters or as additional equalization filters. The subchan-
nel has three additional biquad filters that are also to be used
as equalization and/or crossover filters. In a typical scenario, the
first seven biquads would be used for speaker equalization and/or
tone controls, and the remaining filters would be programmed to
function as crossover filters. Note that there is a common equal-
ization section used for both the main and sub channels, followed
by the crossover filters. This arrangement prevents any interaction
from occurring between the crossover filters and the equalization
filters. One section of the biquad IIR filter is shown in Figure 5.
is the high-
HPF_cutoff
Figure 3. Graphical User Interface
SIGNAL PROCESSING
(3.23 FORMAT)
SERIAL PORT
DAC INTERPOLATION
FILTERS (3.23 FORMAT)
DIGITAL
-
MODULATORS
(1.23 FORMAT)
DIGITAL
CLIPPER
DATA IN
2-BIT SIGN EXTENTION
0.75
1.23
3.23
Figure 4. Numeric Precision and Clipping Structure
REV. A
相關(guān)PDF資料
PDF描述
AD1954YS RESISTOR
AD1954YSRL 16-bit fixed point DSP with Flash
AD1954YST RESISTOR
AD1954YSTRL Hook-Up Wire; Conductor Size AWG:12; No. Strands x Strand Size:65 x 30; Jacket Color:Yellow; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1015, CSA Type TEW, JQA-F-, Passes VW-1 Flame Test; Conductor Material:Copper RoHS Compliant: Yes
AD1954YSTRL7 16-bit fixed point DSP with Flash
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD1954YS 制造商:Analog Devices 功能描述:DAC 3-CH Delta-Sigma 24-bit 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:THREE CHANNEL, 24-BIT SIGMADSP DAC - Bulk
AD1954YSRL 制造商:Analog Devices 功能描述:DAC 3-CH Delta-Sigma 24-bit 44-Pin MQFP T/R
AD1954YST 制造商:Analog Devices 功能描述:DAC 3-CH Delta-Sigma 24-bit 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:THREE CHANNEL, 24-BIT SIGMADSP DAC - Tape and Reel
AD1954YSTRL 制造商:Analog Devices 功能描述:DAC 3-CH Delta-Sigma 24-bit 48-Pin LQFP T/R
AD1954YSTRL7 制造商:AD 制造商全稱:Analog Devices 功能描述:SigmaDSP⑩ 3-Channel, 26-Bit Signal Processing DAC
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