参数资料
| 型号： | AD1893JSTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC SAMPLE-RATE CONV 16BIT 44TQFP |
| 标准包装： | 1 |
| 系列： | SamplePort™ |
| 类型： | 采样率转换器 |
| 应用： | 多媒体 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LQFP |
| 供应商设备封装： | 44-LQFP（10x10） |
| 包装： | 托盘 |
AD1893
REV. A
–7–
THEORY OF OPERATION
There are at least two logically equivalent methods of explaining
the concept of asynchronous sample rate conversion: the high
speed interpolation/decimation model and the polyphase filter
bank model. Using the AD1893 SamplePort does not require
understanding either model. This section is included for those
who wish a deeper understanding of its operation.
Interpolation/Decimation Model
In the high speed interpolation/decimation model, illustrated in
Figure 1, the sampled data input signal (Plot A in Figure 1) is
interpolated at some ratio (IRATIO) by inserting IRATIO-1
zero valued samples between each of the original input signal
samples (Plot B in Figure 1). The frequency domain charac-
teristics of the input signal are unaltered by this operation, ex-
cept that the zero-padded sequence is considered to be sampled
at a frequency which is the product of original sampling fre-
quency multiplied by IRATIO.
The zero-padded values are fed into a digital FIR low-pass filter
(Plot C in Figure 1) to smooth or integrate the sequence, and
limit the bandwidth of the filter output to 20 kHz. The inter-
polated output signal has been quantized to a much finer time
scale than the original sequence. The interpolated sequence is
INPUT
SIGNAL
OUTPUT
SIGNAL
ZERO STUFF
INTERPOLATION
FIR LOW-
PASS
FILTER
ZERO ORDER
HOLD
REGISTER
RESAMPLING
DECIMATION
A
BC
DE
B
C
D
E
A
TIME
AMP
Figure 1. Interpolation/Decimation Model—Time Domain View
then passed to a zero-order hold functional block (physically
implemented as a register, Plot D in Figure 1) and then asyn-
chronously resampled at the output sample frequency (Plot E in
Figure 1). This resampling can be thought of as a decimation
operation since only a very few samples out of the great many
interpolated samples are retained. The output values represent
the “nearest” values, in a temporal sense, produced by the inter-
polation operation. There is always some error in the output
sample amplitude due to the fact that the output sampling switch
does not close at a time that exactly corresponds to a point on the
fine time scale of the interpolated sequence. However, this error
can be made arbitrarily small by using a very large interpolation
ratio. The AD1893 SamplePort ASRC uses an equivalent IRATIO
of 65,536 to provide 16-bit accuracy (
≈–96 dB THD+N) across
the 0 kHz to 20 kHz audio band.
The number of FIR filter taps and associated coefficients is
approximately 4 million. The equivalent FIR filter convolution
frequency (or “upsample” frequency) is 3.2768 GHz, and the
fine time scale has resolution of about 300 ps. Various propri-
etary efficiencies are exploited in the AD1893 ASRC to reduce
the complexity and throughput requirements of the hardware
implied by this interpolation/decimation model.
相关PDF资料 |
PDF描述 |
|---|---|
| AD1895AYRSZRL | IC SAMP-RATEHP/CONV 24BIT 28SSOP |
| AD1896AYRSZRL | IC SAMP-RATEHP/CONV 24BIT 28SSOP |
| AD1940YSTZ | IC DSP AUDIO 16CH/28BIT 48-LQFP |
| AD246JY | IC CLK BUFF DVR 1:1 25KHZ 13-SIP |
| AD532SD | IC MULTIPLIER +/-10V 14-CDIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD1893JSTZRL | 功能描述:IC SAMPLE-RATE CONV 16BIT 44TQFP RoHS:是 类别:集成电路 (IC) >> 线性 - 音频处理 系列:SamplePort™ 其它有关文件:STA321 View All Specifications 标准包装:1 系列:Sound Terminal™ 类型:音频处理器 应用:数字音频 安装类型:表面贴装 封装/外壳:64-LQFP 裸露焊盘 供应商设备封装:64-LQFP EP（10x10） 包装:Digi-Reel® 其它名称:497-11050-6 |
| AD1895 | 制造商:AD 制造商全称:Analog Devices 功能描述:192 kHz Stereo Asynchronous Sample Rate Converter |
| AD1895AYRS | 制造商:Analog Devices 功能描述:Sample Rate Converter 28-Pin SSOP 制造商:Rochester Electronics LLC 功能描述:192KHZ 8:1 STEREO ASYNC SAMPLE RATE CONV - Bulk 制造商:Analog Devices 功能描述:IC STEREO ASR CONVERTER |
| AD1895AYRSRL | 制造商:Analog Devices 功能描述:Sample Rate Converter 28-Pin SSOP T/R |
| AD1895AYRSZ | 功能描述:IC CONV SAMPLE RATE ASYNC 28SSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音频处理 系列:- 其它有关文件:STA321 View All Specifications 标准包装:1 系列:Sound Terminal™ 类型:音频处理器 应用:数字音频 安装类型:表面贴装 封装/外壳:64-LQFP 裸露焊盘 供应商设备封装:64-LQFP EP（10x10） 包装:Digi-Reel® 其它名称:497-11050-6 |
发布紧急采购，3分钟左右您将得到回复。