전자부품 데이터시트 검색엔진 |
|
DS3908 데이터시트(PDF) 6 Page - Maxim Integrated Products |
|
DS3908 데이터시트(HTML) 6 Page - Maxim Integrated Products |
6 / 11 page Dual, 64-Position Nonvolatile Digital Potentiometer with Buffered Outputs 6 _____________________________________________________________________ POT0 H0 V0 L0 H1 V1 L1 I2C INTERFACE SDA SCL A0 A1 A2 WP GND VCC DS3908 PGA0 POT1 PGA1 VCC VCC RWP 1x, 2x, 4x GAIN F8h F9h FAh FBh G1 G0 EEPROM 1x, 2x, 4x GAIN POT0 REGISTER POT1 REGISTER POT0/1 REGISTER Functional Diagram Detailed Description The DS3908 contains two nonvolatile digital poten- tiometers with programmable-gain amplifiers buffering the wiper outputs. The potentiometers have 63 equally weighted (linear- taper) resistive elements, for a total of 64 taps. The resistive elements are built using a low-temperature- drift material, and have a typical 100k Ω end-to-end resistance. This produces an output that is highly lin- ear, with the highest and lowest taps connected to high (Hx) and low (Lx) terminals, respectively. The poten- tiometers are independently controlled using an I2C- compatible interface. Three address pins allow one of eight slave addresses to be selected. The eight slave addresses allow the DS3908 address to be customized for applications with multiple I2C devices, and allow up to eight DS3908s to be placed on the same I2C bus. The potentiometer positions are saved in EEPROM, and are recalled during each power-up to provide non- volatile position settings. Once the settings are written, the write-protect pin prevents accidental writes to the potentiometers. The write-protection function is ideal for analog factory calibration because it prevents errant transactions on the I2C bus from corrupting the settings of the device. The WP pin contains an internal pullup resistor that must be pulled low to write to the device. The programmable-gain amplifiers can be indepen- dently set to one of three different gains—1V/V, 2V/V, or 4V/V. The amplifiers’ common-mode input range is from ground to 1.5V below VCC, and the output is rail-to-rail and capable of driving 1mA loads, 300mV from each supply rail. The outputs are stable driving 100pF loads for applications that require output filtering. The addition of the amplifier to buffer the potentiometer wiper offers distinct advantages over standard digital potentiometers. The buffer provides a high-impedance load for the potentiometer and a low-impedance volt- age output. This improves the linearity of the output voltage for systems that load the potentiometer by elim- inating the changes in current through both the poten- tiometer and the wiper impedance. It also allows voltage gain from the potentiometer input to the output. Because the amplifiers are integrated into the DS3908, this is done without increasing the footprint of the design or the complexity of the PC board. |
유사한 부품 번호 - DS3908 |
|
유사한 설명 - DS3908 |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |