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參數(shù)資料
| 型號(hào)： | X9C503 |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | EEPOT Nonvolatile Digital Potentiometer(100個(gè)抽頭,-5V~+5V,50K總電阻,非易失性數(shù)字電位器) |
| 中文描述： | EEPOT非易失數(shù)字電位器（100個(gè)抽頭，- 5V的?5V的，50K的總電阻，非易失性數(shù)字電位器） |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 87K |
| 代理商： | X9C503 |
Xicor Application Note
AN120-4
AN120
The 100Hz sampling rate is determined by the R8, R9, C1
timing components in the S1-S2 multivibrator with the
oscillator period approximately equal to C1(R8 + R9). The
relatively long (~10ms) period is dictated by the operation
of A1 as an open-loop comparator while in null mode. Op
amps such as A1 make relatively good comparators in
terms of ultimate DC accuracy, but they have much slower
response times (multiple millisecond slew times) than true
comparators, especially when the differential input voltage
is near null. Because the AD822 op amp has a gain-
bandwidth product of ~3MHz, the time required for a 5V
output slew is approximately 5V/(3MHz* Vin)=1.7ms/mV.
Therefore, allowing ~10ms settling time between output-
state samples implies a null-point resolution of +/-170μV
=+/-0.50°C.
If ACQUIRE is held low long enough (1 second will always
suffice), the result will be for P1 to be driven to the setting
that causes A1 to dither around zero output, indicating that
P1’s setting is alternating between the two values that
bracket optimum T0 null.
When ACQUIRE is returned to logic “1”, P1 will therefore
retain the bridge-ratio needed to cancel the temperature
present at Rt during the nulling process and cause the
thermometric signal presented to scaling op amp A2 to thus
be referenced to this initial T0. Because P1 setpoint
memory is digital, it will hold this ratio forever unless
ACQUIRE is deliberately put through another 0/1 cycle to
acquire a new T0, or power is removed from the
thermometer.
A2 applies the necessary gain, digitally fine-adjusted by
P2, of 01/.000385=25.97 to achieve an output scale factor
of 10mV/°C.
Op Amp Offset Nulling
Op amp applications that need the highest possible DC
accuracy are generally best served by CMOS chopper-
stabilized amplifiers, such as the LTC1050. But high-speed,
low-noise applications may require high-performance
rockets, such as the 700-MHz LT1226. So what to do for
applications that need it
all
topology in which a bipolar amplifier provides gain-
bandwidth and a CMOS chopper acts as an offset-nulling
servo can do the job. Such arrangements can successfully
null out offset-voltage errors. But these circuits can get
messy if you also need bias-current-related error
correction. The circuit in Figure 4 offers an error-
cancellation method that handles both error sources.
Sometimes, a composite
Figure 4. Have your cake (high speed) and eat it (low DC errors) too, with this autonulling circuit, using
a digitally controlled potentiometer.
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| X9C503P | 功能描述:IC DIGITAL POT 50K 100TP 8DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 標(biāo)準(zhǔn)包裝:2,500 系列:XDCP™ 接片:256 電阻（歐姆）:100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 ±300 ppm/°C 存儲(chǔ)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:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) |
| X9C503PI | 功能描述:IC DIGITAL POT 50K 100TP 8DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 標(biāo)準(zhǔn)包裝:2,500 系列:XDCP™ 接片:256 電阻（歐姆）:100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 ±300 ppm/°C 存儲(chǔ)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:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) |
| X9C503PIZ | 功能描述:IC XDCP 100-TAP 50K EE 8-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 接片:256 電阻（歐姆）:100k 電路數(shù):2 溫度系數(shù):標(biāo)準(zhǔn)值 35 ppm/°C 存儲(chǔ)器類型:易失 接口:6 線串行（芯片選擇，遞增，增/減） 電源電壓:2.6 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) |
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