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參數(shù)資料
| 型號： | AD1954YSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC AUDIO 3CHAN 26BIT 48LQFP |
| 產(chǎn)品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 1 |
| 系列： | SigmaDSP® |
| 位數(shù)： | 26 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 3 |
| 電壓電源： | 模擬和數(shù)字 |
| 功率耗散（最大）： | 510mW |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 托盤 |
| 輸出數(shù)目和類型： | 6 電壓，單極 |
| 采樣率（每秒）： | 48k |
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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 compressor/
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
fS
=
× ×
1.0
–2.0
where EXP is the exponential operator,
EXP
HPF_cutoff is the high-
HPF_cutoff
pass cutoff in Hz, and fS
ff is the audio sampling rate.The default
SS
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.
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD1954YSTZRL | 功能描述:IC DAC AUDIO 3CHAN 26BIT 48LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:SigmaDSP® 標準包裝:47 系列:- 設(shè)置時間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:* |
| AD1954YSZ | 制造商:Analog Devices 功能描述:DAC 3-CH Delta-Sigma 24-bit 44-Pin MQFP |
| AD1955 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Performance Multibit DAC with SACD Playback |
| AD1955ARS | 制造商:Rochester Electronics LLC 功能描述:24 BIT 192KHZ DAC 123 DB DNR WITH SACD - Bulk 制造商:Analog Devices 功能描述:IC DAC 24-BIT |
| AD1955ARSRL | 制造商:Analog Devices 功能描述:DAC 2-CH Delta-Sigma 24-bit 28-Pin SSOP T/R 制造商:Rochester Electronics LLC 功能描述:24 BIT 192KHZ DAC 123 DB DNR WITH SACD - Bulk |
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