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參數(shù)資料
| 型號： | DS1808 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Process: 1P, 1M, 5.0um, 30V NF & PF, UVNd, UVPd ,N+ESD,TEOS Spacer, Passivation w/Nov TEOS Oxide-Nitride |
| 中文描述： | 雙路對數(shù)數(shù)字電位器 |
| 文件頁數(shù)： | 4/17頁 |
| 文件大?。?/td> | 431K |
| 代理商： | DS1808 |
DS1808
4 of 17
OPERATION
The DS1808 is a dual-channel, digitally controlled, logarithmic potentiometer. Each potentiometer has
three accessible terminals, which include H
,
L, and W. Between each resistor element is a tap-point that is
multiplexed to the wiper terminal, W. A block diagram of the DS1808 is shown in Figure 1.
Potentiometer Characteristics
The DS1808 is a volatile device and always powers-up with the wiper positions set to the mute position
(33-decimal) with 90-dB of signal attenuation. The resistor section of the DS1808 is composed of two 32-
position resistor arrays that provide a logarithmic attenuation. The resistor section of the DS1808
provides a typical 50k
end-to-end resistance between the H terminal and the L terminal. The wiper
terminal will have a total possible 34 tap positions. The 34
th
position is considered the mute position and
will provide attenuation in excess of 90dB.
The potentiometers of the DS1808 are closely matched and provide excellent tracking. Interchannel
matching for the device is specified to provide less than 0.5dB. Tap-to-tap tolerances for the device are
specified to provide less than 0.5dB.
Power Supplies
The DS1808 is designed to be powered from dual ±12V supplies. The maximum input signal that can be
placed across the potentiometer sections is ±12V. The device can also be powered using a single +12V
power source. When using the device in a single supply configuration, V
B
is set to 0V and the maximum
potentiometer input signals are restricted to single supply voltage rails.
Controlling the Potentiometers
All writing and reading to the potentiometers is done with the industry standard 2-wire interface, which
includes pins SDA and SCL.
2-WIRE SERIAL PORT OPERATION
The 2-wire serial port interface supports a bi-directional data transmission protocol with device
addressing. A device that sends data on the bus is defined as a transmitter, and a device receiving data as
a receiver. The device that controls the message is called a master. The devices that are controlled by the
master are slaves. The bus must be controlled by a master device that generates the serial clock (SCL),
controls the bus access, and generates the start and stop conditions. The DS1808 operates as a slave on
the two-wire bus. Connections to the bus are made via the open-drain I/O lines SDA and SCL. The
following I/O terminals control the 2-wire serial port: /CE, SDA, SCL, A0, A1, A2. Timing diagrams for
the 2-wire serial port can be found in Figures 2 and 7.
相關(guān)PDF資料 |
PDF描述 |
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| DS1809-010 | Dallastat, 64-position linear taper |
| DS1809U-010 | Dallastat, 64-position linear taper |
| DS1809U-050 | Dallastat, 64-position linear taper |
| DS1809U-100 | Dallastat, 64-position linear taper |
| DS1809Z-010 | Dallastat, 64-position linear taper |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1808Z-050 | 功能描述:數(shù)字電位計 IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1808Z-050/T&R | 制造商:Maxim Integrated Products 功能描述:DUAL LOG HI VOLTAGE POT T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC POT DUAL LOG HV 50K 16-SOIC |
| DS1808Z-050/T&R | 功能描述:數(shù)字電位計 IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1808Z-050+ | 功能描述:數(shù)字電位計 IC Dual Log RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1808Z-050+T&R | 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 32POS 45KOHM DUAL 16SOIC N - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC POT DUAL LOG HV 50K 16-SOIC |
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