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| 型号： | MAX5440EAG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC CNTRL VOL STEREO 24-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 58 |
| 类型： | 立体声音量控制 |
| 应用： | 车载系统，台式音频，机顶盒 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
MAX5440
Stereo Volume Control
with Rotary Encoder Interface
Detailed Description
The MAX5440 dual, 40k logarithmic taper digital
potentiometer features a debounced up/down interface
for use with a simple rotary encoder without using a
microcontroller. Each potentiometer has 32 log-spaced
tap points with a buffered wiper output and replaces
mechanical potentiometers.
Mode Control (
MODE)
The MAX5440 MODE input toggles between volume
and balance modes. Force MODE low to toggle
between volume and balance modes. For example, dri-
ving MODE low once while in volume-control mode
switches the MAX5440 to balance mode. Driving MODE
low again switches the MAX5440 back to volume mode.
MODE is internally pulled high with a 45k resistor to
VLOGIC. The MAX5440 powers up in volume-control
mode. Leave unconnected or connect to VLOGIC if bal-
ance mode is not required.
Rotary Encoder Interface
The MAX5440 interfaces with rotary encoder switches.
The rotary encoder is a contact closure type switch with
two outputs that connect to RENCODEA and
RENCODEB on the device. As the shaft is rotated,
RENCODEA and RENCODEB produce a gray code
count. Figure 1 shows a typical rotary encoder interface.
State changes trigger a wiper movement and the direc-
tion of the count dictates the direction of wiper move-
ment. An increasing gray code count moves the wiper
up to a lower attenuation setting in volume mode and
towards a full right channel (CH1) in balance mode. A
decreasing gray code count moves the wiper down to a
higher attenuation in volume mode and towards a full left
channel (CH0) in balance mode. Both switch inputs are
internally pulled up to VLOGIC by internal 45k resistors.
During rapid rotation, the inputs must be stable for at
least 20ms and have separation between state
changes by at least 40ms for the debounce circuitry to
accurately detect the input states.
Figure 1. Rotary Encoder Interface
MAX5440
B
RENCODEA
RENCODEB
ROTARY
ENCODER
A
GND
VLOGIC
45k
CLOCKWISE ROTATION
INCREASING GRAY CODE (AB)
11, 10, 00, 01, 11, 10, ETC.
COUNTERCLOCKWISE ROTATION
DECREASING GRAY CODE (AB)
11, 01, 00, 10, 11, 01, ETC.
CW
CLOSED CIRCUIT
OPEN CIRCUIT
CLOSED CIRCUIT
CHANNEL A
CHANNEL B
1/4 CYCLE PER DETENT
D
DDD
D
DDD
D
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
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| MAX5440EAG+ | 功能描述:数字电位计 IC Stereo Vol Control w/Rotary Encoder RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| MAX5440EAG+T | 功能描述:数字电位计 IC Stereo Vol Control w/Rotary Encoder RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| MAX5441ACUA | 功能描述:数模转换器- DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| MAX5441ACUA+ | 功能描述:数模转换器- DAC 16-Bit Precision DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| MAX5441ACUA+T | 功能描述:数模转换器- DAC 16-Bit Precision DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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