AD7376ARUZ100-R7

更新时间： 2024-01-22 17:59:05

品牌	Logo	应用领域
亚德诺 - ADI		数字电位计
页数	文件大小	规格书
20页	452K
描述
128-Position Digital Potentiometer

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AD7376ARUZ100-R7 数据手册

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AD7376

In Figure 34, the lower trace shows that the volume level

changes from a quarter scale to full scale when a signal change

occurs near the zero-crossing window.

AUDIO VOLUME CONTROL

Because of its good THD performance and high voltage

capability, the AD7376 can be used for digital volume control. If

AD7376 is used directly as an audio attenuator or gain amplifier,

a large step change in the volume level at any arbitrary time can

lead to an abrupt discontinuity of the audio signal, causing an

audible zipper noise. To prevent this, a zero-crossing window

The AD7376 shutdown sleep-mode programming feature can

SHDN

be used to mute the device at power-up by holding

and programming zero scale.

low

detector can be inserted to the

line to delay the device

update until the audio signal crosses the window. Since the

input signal can operate on top of any dc levels rather than

absolute zero volt level, zero-crossing, in this case, means the

signal is ac-coupled and the dc offset level is the signal zero

reference point.

The configuration to reduce zipper noise and the result of using

this configuration are shown in Figure 35 and Figure 34,

respectively. The input is ac-coupled by C1 and attenuated

down before feeding into the window comparator formed by

U2, U3, and U4B. U6 is used to establish the signal zero

reference. The upper limit of the comparator is set above its

offset and, therefore, the output pulses high whenever the input

falls between 2.502 V and 2.497 V (or 0.005 V window) in this

example. This output is AND’ed with the chip select signal such

that the AD7376 updates whenever the signal crosses the

window. To avoid constant update of the device, the chip select

signal should be programmed as two pulses, rather than the one

shown in Figure 2.

CHANNEL 1

FREQ = 20.25kHz

1.03V p-p

NOTES

1. THE LOWER TRACE SHOWS THAT THE VOLUME LEVEL

CHANGES FROM QUARTER SCALE TO FULL SCALE, WITH THE

CHANGE OCCURRING NEAR THE ZERO-CROSSING WINDOW.

Figure 34. Input (Trace 1) and Output (Trace 2) of the Circuit in Figure 35

1µF

+5V

+15V

+5V

100kΩ

0.1µF

AD7376

V+

0.1µF

ADCM371

V–

200Ω

+15V

90kΩ

–15V

U4A

V+

U4B

100kΩ

OUT

+5V

7408

10kΩ

V–

V+

+5V

CLK

SDI

CLK

SDI

ADCM371

V–

–15V

V+

GND

100Ω

AD8541

V–

Figure 35. Audio Volume Control with Zipper Noise Reduction

Rev. D | Page 17 of 20

1...14 15 161718 19 20

中文翻译

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AD7376ARUZ100-R7 替代型号

型号	品牌	替代类型	描述	数据表
AD7376ARUZ100-R7	ADI	当前型号	128-Position Digital Potentiometer
AD7376ARUZ100	ADI	类似代替	128-Position Digital Potentiometer

与AD7376ARUZ100-R7相关器件

型号	品牌	获取价格	描述	数据表
AD7376ARUZ10-R7	ADI	获取价格	128-Position Digital Potentiometer
AD7376ARUZ50	ADI	获取价格	128-Position Digital Potentiometer
AD7376ARUZ50-REEL7	ADI	获取价格	128-Position Digital Potentiometer
AD7376ARWZ10	ADI	获取价格	128-Position Digital Potentiometer
AD7376ARWZ100	ADI	获取价格	128-Position Digital Potentiometer
AD7376ARWZ10-RL	ADI	获取价格	128-Position Digital Potentiometer
AD7376ARWZ50	ADI	获取价格	128-Position Digital Potentiometer
AD737AN	ADI	获取价格	IC RMS TO DC CONVERTER, 0.005 MHz, PDIP8, PLASTIC, MS-001, DIP-8, Analog Special Function
AD737ANZ	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737AQ	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter

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