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參數(shù)資料
| 型號： | DS1800 |
| 英文描述： | Dual Inverting Log Gain/Attenuator |
| 中文描述： | 雙反向登錄增益/衰減器 |
| 文件頁數(shù)： | 2/14頁 |
| 文件大?。?/td> | 428K |
| 代理商： | DS1800 |
DS1800
2
of
14
DESCRIPTION
The DS1800 is a dual audio-taper potentiometer designed specifically for use in the feedback path of the
inverting configuration of an operational amplifier (see Figure 2). In this configuration, the DS1800
provides a V
O
/V
I
relationship of -20log(R
F
/R
I
), giving a gain/attenuation range covering +20 dB to -63
dB. Each potentiometer has a total of 129 positions including mute. The DS1800 provides five areas of
resolution, which include: 0.25 dB per step from +20 dB to +3 dB; 0.5 dB per step from +3 dB to -12 dB;
1 dB from -12 dB to -27 dB; 2 dB per step from -27 dB to -47 dB; and 4 dB per step from -47 dB to -63
dB. The mute position provides 100 dB of attenuation.
The DS1800 has two control interfaces (see Figure 1). The first is a 3-wire serial CPU interface
consisting of
RST
, CLK, and D. The second interface is a contact-closure interface, allowing easy push-
button control without the need for external debounce or timing circuitry. The device also provides for
software muting (via CPU) or hardware muting (MUTE control input). The hardware mute is a toggle
type which returns the wiper positions to their prior states. Additional information on CPU and push-
button control is described under the section entitled “OPERATION.”
The DS1800 is available in 20-pin DIPs, SOICs, and TSSOPs. One standard resistance grade of 53 k
=
is
available for the device.
OPERATION
The DS1800 provides two 129-position 45 k
potentiometers. These potentiometers are specifically
designed to operate in the configuration shown in Figure 2. Under this configuration the V0/VI
relationship provides the gain/attenuation function of -20log(R
F
/R
I
) over a range of +20 dB to -63 dB.
This function is illustrated in Figure 3 as a graph of gain/attenuation versus position. Figure 4 provides
the relationship between R
F
and R
I
as a function of position.
The DS1800 has a total of 129 positions including a mute position. Five areas of resolution are provided
over the gain/attenuation range and are illustrated in Figure 3. From position 0 to position 68, a resolution
of 0.25 dB per step is attained covering a gain/attenuation range of +20 dB to +3 dB. From position 68 to
position 98, 0.5 dB per step of resolution is attained covering +3 dB to -12 dB of gain/attenuation.
Positions 98 to 113 have 1 dB per step resolution and cover a gain/attenuation range of -12 to -27 dB.
Positions 113 to 123 provide 2 dB per step and cover a gain/attenuation range of -27 dB to -47 dB.
Positions 123 to 127 provide 4 dB per step and cover a gain/attenuation range of -47 dB to 63 dB.
Position 128 is the mute position and typically provides 100 dB of attenuation.
PIN DESCRIPTIONS
The DS1800 has a total of 20 pins which provide various functions for the device. This section provides a
description of each pin’s operation.
V
CC
- Power Supply Voltage Input. The DS1800 will support 3V or 5V power supply operation.
GND
- Ground. The DS1800 has two ground pins. The GND supports the digital ground for the device.
AGND
- Analog Ground. The DS1800 has two ground pins. The AGND supports analog ground for the
device.
IN0, IN1
- Input terminals for the two respective potentiometers as shown in Figure 2. These terminals
should be connected to the analog signal, VI, to provide the gain/attenuation characteristics stated. These
terminals are referenced as INx in the Figure 2 drawing.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
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| DS1801S | Dual Audio Taper Potentiometer |
| DS1802 | Dual Audio Taper Potentiometer With Pushbutton Control |
| DS1822-PAR | Econo 1-Wire?? Parasite-Power Digital Thermometer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1800-3 | 功能描述:線性和開關(guān)式電源 12V output, 1800W 1U x 4.2" x 11" RoHS:否 制造商:TDK-Lambda 產(chǎn)品:Switching Supplies 開放式框架/封閉式:Enclosed 輸出功率額定值:800 W 輸入電壓:85 VAC to 265 VAC 輸出端數(shù)量:1 輸出電壓（通道 1）:20 V 輸出電流（通道 1）:40 A 商用/醫(yī)用: 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:Rack 長度: 寬度: 高度: |
| DS1801 | 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1801+ | 功能描述:數(shù)字電位計 IC Dual Audio Taper Potentiometer 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1801E | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Dual Audio Taper Potentiometer |
| DS1801E-014 | 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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