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AD1893JST

更新时间： 2024-01-28 08:21:19

品牌	Logo	应用领域
罗彻斯特 - ROCHESTER		/
页数	文件大小	规格书
21页	900K
描述
SPECIALTY CONSUMER CIRCUIT, PQFP44, 10 X 10 MM, LQFP-44

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AD1893JST 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	QFP
包装说明：	LQFP,	针数：	44
Reach Compliance Code：	unknown	风险等级：	5.09
商用集成电路类型：	CONSUMER CIRCUIT	JESD-30 代码：	S-PQFP-G44
JESD-609代码：	e0	长度：	10 mm
湿度敏感等级：	3	功能数量：	1
端子数量：	44	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	LQFP	封装形状：	SQUARE
封装形式：	FLATPACK, LOW PROFILE	峰值回流温度（摄氏度）：	240
认证状态：	COMMERCIAL	座面最大高度：	1.6 mm
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	2.7 V
表面贴装：	YES	技术：	CMOS
温度等级：	COMMERCIAL	端子面层：	TIN LEAD
端子形式：	GULL WING	端子节距：	0.8 mm
端子位置：	QUAD	处于峰值回流温度下的最长时间：	30
宽度：	10 mm	Base Number Matches：	1

AD1893JST 数据手册

AD1893

THEORY OF OPERATION

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.

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 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.

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

FIR LOW-

PASS

FILTER

ZERO ORDER

HOLD

INPUT

SIGNAL

ZERO STUFF

INTERPOLATION

OUTPUT

SIGNAL

RESAMPLING

DECIMATION

AMP

TIME

Figure 1. Interpolation/Decimation Model—Time Domain View

REV. A

–7–

1...5 6 789 10 11...21

中文翻译

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与AD1893JST相关器件

型号	品牌	获取价格	描述	数据表
AD1893JSTZ	ADI	获取价格	暂无描述
AD1893JSTZ	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP44, 10 X 10 MM, LQFP-44
AD1895	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter
AD1895AYRS	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter
AD1895AYRSRL	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter
AD1895AYRSZ	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, PDSO28, PLASTIC, MO-150AH, SSOP-28
AD1895AYRSZ	ADI	获取价格	192 kHZ Stereo Asynchronous Sample Rate Converter
AD1895AYRSZRL	ADI	获取价格	192 kHZ Stereo Asynchronous Sample Rate Converter
AD1895JRS	ADI	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PDSO28, SSOP-28, Consumer IC:Other
AD1895YRS	ADI	获取价格	192 kHz Stereo Asynchronous Sample Rate Converter

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