- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9321 > MCP4441-104E/ST (Microchip Technology)IC DGTL POT 129TAPS QUAD 20TSSOP PDF資料下載
參數(shù)資料
| 型號： | MCP4441-104E/ST |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 75/100頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 129TAPS QUAD 20TSSOP |
| 標(biāo)準(zhǔn)包裝： | 74 |
| 接片： | 129 |
| 電阻（歐姆）： | 100k |
| 電路數(shù)： | 4 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 150 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | I²C（設(shè)備位址） |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 管件 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁當(dāng)前第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁
MCP444X/446X
DS22265A-page 76
2010 Microchip Technology Inc.
8.5
Implementing Log Steps with a
Linear Digital Potentiometer
In audio volume control applications, the use of
logarithmic steps is desirable since the human ear
hears in a logarithmic manner. The use of a linear
potentiometer can approximate a log potentiometer,
but with fewer steps. An 8-bit potentiometer can
achieve fourteen 3 dB log steps plus a 100% (0 dB)
and a mute setting.
Figure 8-7 shows a block diagram of one of the
MCP44x1 resistor networks being used to attenuate an
input signal. In this case, the attenuation will be ground
referenced. Terminal B can be connected to a common
mode voltage, but the voltages on the A, B and Wiper
terminals must not exceed the MCP44x1’s VDD/VSS
voltage limits.
FIGURE 8-7:
Signal Attenuation Block
Diagram - Ground Referenced.
Equation 8-1 shows the equation to calculate voltage
dB gain ratios for the digital potentiometer, while
Equation 8-2 shows the equation to calculate
resistance dB gain ratios. These two equations assume
that the B terminal is connected to ground.
If terminal B is not directly resistively connected to
ground, then this terminal B to ground resistance
(RB2GND) must be included into the calculation.
Equation 8-3 shows this equation.
EQUATION 8-1:
dB CALCULATIONS
(VOLTAGE)
EQUATION 8-2:
dB CALCULATIONS
(RESISTANCE) - CASE 1
EQUATION 8-3:
dB CALCULATIONS
(RESISTANCE) - CASE 2
Table 8-1 shows the codes that can be used for 8-bit
digital potentiometers to implement the log attenuation.
The table shows the wiper codes for -3 dB, -2 dB, and
-1 dB attenuation steps. This table also shows the
calculated attenuation based on the wiper code’s linear
step. Calculated attenuation values less than the
desired attenuation are shown with red text. At lower
wiper code values, the attenuation may skip a step, if
this occurs the next attenuation value is colored
magenta to highlight that a skip occurred. For example,
in the -3 dB column the -48 dB value is highlighted
since the -45 dB step could not be implemented (there
are no wiper codes between 2 and 1).
P0A
MCP44X1
P0W
P0B
L = 20 * log10 (VOUT / VIN)
dB
VOUT / VIN Ratio
-3
0.70795
-2
-1
0.79433
0.89125
L = 20 * log10 (RBW / RAB)
Terminal B connected to Ground (see Figure 8-7)
L = 20 * log10 ( (RBW + RB2GND) / (RAB + RB2GND) )
Terminal B through RB2GND to Ground
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MS3110J12-10S | CONN RCPT 10POS WALL MNT W/SCKT |
| VI-2NY-MW-F3 | CONVERTER MOD DC/DC 3.3V 66W |
| VI-21N-MX-B1 | CONVERTER MOD DC/DC 18.5V 75W |
| D38999/20WE8PN | CONN RCPT 8POS WALL MNT W/PINS |
| MS3101E32-76S | CONN RCPT 19POS FREE HNG W/SCKT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP4441-502E/ML | 功能描述:數(shù)字電位計 IC 5k I2C Quad Ch 7bit Nonvolatile Memory 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 |
| MCP4441-502E/ML | 制造商:Microchip Technology Inc 功能描述:; End To End Resistance:5kohm; Track Tap 制造商:Microchip Technology Inc 功能描述:IC, DIG POT, 5kohm, 129STEPS, QUAD, QFN-20 |
| MCP4441-502E/ST | 功能描述:數(shù)字電位計 IC 5k I2C Quad Ch 7bit Nonvolatile Memory 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 |
| MCP4441-502E/ST | 制造商:Microchip Technology Inc 功能描述:; End To End Resistance:5kohm; Track Tap 制造商:Microchip Technology Inc 功能描述:IC, DIG POT, 5kohm, 129STEPS, QUAD, TSSOP-20 |
| MCP4441-503E/ML | 功能描述:數(shù)字電位計 IC 50k I2C Quad Ch 7bit Nonvolatile Memory 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。