- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1890 > AD5293BRUZ-50-RL7 (Analog Devices Inc)IC DGTL POT 1024POS 50K 14TSSOP PDF資料下載
參數(shù)資料
| 型號： | AD5293BRUZ-50-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 1024POS 50K 14TSSOP |
| 標準包裝： | 1,000 |
| 接片： | 1024 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標準值 35 ppm/°C |
| 存儲器類型： | 易失 |
| 接口： | 4 線串行 |
| 電源電壓： | 9 V ~ 33 V，±9 V ~ 16.5 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
AD5293
Rev. D | Page 23 of 24
AUDIO VOLUME CONTROL
The excellent THD performance and high voltage capability
of the AD5293 make it ideal for digital volume control. The
AD5293 is used as an audio attenuator; it can be connected
directly to a 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 detector can be inserted to the CS line to
delay the device update until the audio signal crosses the window.
Because the input signal can operate on top of any dc level,
rather than absolute 0 V 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 is shown in Figure 56,
and the results of using this configuration are shown in Figure 55.
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 as 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 AD5293
updates whenever the signal crosses the window. To avoid a
constant update of the device, the chip select signal should be
programmed as two pulses, rather than as one.
In Figure 55, 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.
CHANNEL 1
FREQ = 20.25kHz
1.03V p-p
1
2
0
76
75
-1
58
Figure 55. Zipper Noise Detector
R1
100k
R2
200
5V
VIN
V+
V–
AD8541
5V
U6
R3
100k
R4
90k
R5
10k
C1
1F
VDD
VSS
SCLK
SDIN
V+
V–
AD5293
20k
+15V
–15V
C3
0.1F
C2
0.1F
A
B
W
GND
SDIN
SCLK
U1
VCC
GND
VCC
GND
ADCMP371
+15V
–15V
+5V
U3
U2
VOUT
U5
U4A
U4B
1
6
2
4
5
7408
SYNC
07
67
5-
15
7
Figure 56. Audio Volume Control with Zipper Noise Reduction.
相關PDF資料 |
PDF描述 |
|---|---|
| AD5320BRM | IC DAC 12BIT 2.7V R-R OUT 8-MSOP |
| AD5321BRM | IC DAC 12BIT 2.5V 2-WIRE 8-MSOP |
| AD5322BRM | IC DAC 12BIT DUAL R-R OUT 10MSOP |
| AD5323BRU | IC DAC 12 BIT DUAL R-R 16-TSSOP |
| AD5324BRM | IC DAC 12BIT QUAD 2.5V 10-MSOP |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD-52PL-711A/E | 制造商:ICE TECHNOLOGY 功能描述:IC SPECIFIC ADAPTER, 52-PLCC TO 40-DIP, Convert From:52-PLCC, Convert To:40-DIP, |
| AD52YBD | 制造商:n/a 功能描述:_ |
| AD53/009-9 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD53/015-0 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD53/016-0REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。