Datasheet > AD1893JST

AD1893JST

更新时间： 2024-01-10 08:39:29

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

(continued from Page 1)

DEFINITIONS

Dynamic Range

PRODUCT OVERVIEW (Continued)

The ratio of a near full-scale input signal to the integrated noise

in the passband (0 kHz to ≈20 kHz), expressed in decibels (dB).

Dynamic range is measured with a –60 dB input signal and

“60 dB” arithmetically added to the result.

limited to avoid alias distortion on the output signal. The

AD1893 dynamically alters the low-pass filter cutoff frequency

smoothly and slowly, so that real-time variations in the sample

rate ratio are possible without degradation of the audio quality.

Total Harmonic Distortion + Noise

The AD1893 has a pin selectable slow- or fast-settling mode.

This mode determines how quickly the ASRC adapts to a

change in either the input sample clock frequency (F_SIN) or the

output sample clock frequency (F_SOUT). In the slow-settling

mode, the control loop which computes the ratio between F_SIN

and F_SOUTsettles in approximately 800 ms and begins to reject

jitter above 3 Hz. The slow-settling mode offers the best signal

quality and the greatest jitter rejection. In the fast-settling mode,

the control loop settles in approximately 200 ms and begins to

reject jitter above 12 Hz. The fast-settling mode allows rapid,

real time sample rate changes to be tracked without error, at the

expense of some narrowband noise modulation products on the

output signal.

Total Harmonic Distortion plus Noise (THD+N) is defined as

the ratio of the square root of the sum of the squares of the values

of the harmonics and noise to the rms value of a sinusoidal

input signal. It is usually expressed in percent (%) or decibels.

Interchannel Phase Deviation

Difference in input sampling times between stereo channels,

expressed as a phase difference in degrees between 1 kHz inputs.

Group Delay

Intuitively, the time interval required for a full-level input pulse

to appear at the converter’s output, at full level, expressed in

milliseconds (ms). More precisely, the derivative of radian

phase with respect to radian frequency at a given frequency.

Transport Delay

The AD1893 features short group delay processing. This feature

relates to the depth of the First-In, First-Out (FIFO) memory,

which buffers the input data samples before they are processed

by the FIR convolver. In the AD1893, the group delay is

approximately 700 µs. If the read and write pointers that

manage the FIFO cross (indicating underflow or overflow), the

AD1893 asserts the mute output (MUTE_O) pin HI for 128

output clock cycles. If MUTE_O is connected to the mute input

(MUTE_I) pin, as it normally should be, the serial output will

be muted (i.e., all bits zero) during this transient event.

The time interval between when an impulse is applied to the

converter’s input and when the output starts to be affected by

this impulse, expressed in milliseconds (ms). Transport delay is

independent of frequency.

The AD1893 includes an on-chip oscillator that only requires

the user provide an external crystal. By removing the need for

an external oscillator, the AD1893 lowers the total cost of own-

ership to the end user. The AD1893 also includes a power-

down mode, which is invoked with the PWRDWN pin.

Asserting this control signal HI will place the AD1893 into a

very low power dissipation in active and standby condition.

The AD1893 is fabricated in a 0.8 µm single poly, double metal

CMOS process and are packaged in a 0.6" wide 28-lead plastic

DIP and a 10 mm by 10 mm body size 44-lead LQFP. The

AD1893 operates from a +3 V to +5 V power supply over the

temperature range of 0°C to +70°C.

REV. A

–4–

1 2 3 456 7 8...21

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与AD1893JST相关器件

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

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