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參數(shù)資料
| 型號： | LTC2055CMS8#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | Single/Dual Micropower Zero-Drift Operational Amplifiers; Package: MSOP; No of Pins: 8; Temperature Range: 0°C to +70°C |
| 中文描述： | DUAL OP-AMP, 3 uV OFFSET-MAX, 0.5 MHz BAND WIDTH, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 20/21頁 |
| 文件大?。?/td> | 629K |
| 代理商： | LTC2055CMS8#TRPBF |
8
LTC2054/LTC2055
sn20545 20545fas
Clock Feedthrough, Input Bias Current
The LTC2054 and LTC2055 use auto-zeroing circuitry to
achieve an almost zero DC offset over temperature,
common mode voltage, and power supply voltage. The
frequency of the clock used for auto-zeroing is typically
1.0kHz. The term clock feedthrough is broadly used to
indicate visibility of this clock frequency in the op amp
output spectrum. There are typically two types of clock
feedthrough in auto zeroed op amps like the LTC2054/
LTC2055.
The first form of clock feedthrough is caused by the
settling of the internal sampling capacitor and is input
referred; that is, it is multiplied by the closed loop gain of
the op amp. This form of clock feedthrough is independent
of the magnitude of the input source resistance or the
magnitude of the gain setting resistors. The LTC2054/
LTC2055 have a residue clock feedthrough of less then
0.2VRMS input referred at 1.0kHz.
The second form of clock feedthrough is caused by the
small amount of charge injection occurring during the
sampling and holding of the op amp’s input offset voltage.
The current spikes are multiplied by the impedance seen
at the input terminals of the op amp, appearing at the
output multiplied by the closed loop gain of the op amp. To
reduce this form of clock feedthrough, use smaller valued
gain setting resistors and minimize the source resistance
at the input. If the resistance seen at the inputs is less than
10k, this form of clock feedthrough is less than the amount
of residue clock feedthrough from the first form described
above.
Placing a capacitor across the feedback resistor reduces
either form of clock feedthrough by limiting the bandwidth
of the closed loop gain.
Input bias current is defined as the DC current into the
input pins of the op amp. The same current spikes that
APPLICATIO S I FOR ATIO
WU
UU
0.4V
10 SEC
2054 G16
1V
1 SEC
2054 G17
LTC2054/LTC2055 DC to 1Hz Noise
LTC2054/LTC2055 DC to 10Hz Noise
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| LTC2202CUK#PBF | 16-Bit, 10Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: 0°C to +70°C |
| LTC2202CUK#TRPBF | 16-Bit, 10Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: 0°C to +70°C |
| LTC2202IUK#PBF | 16-Bit, 10Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: -40°C to +85°C |
| LTC2202IUK#TRPBF | 16-Bit, 10Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: -40°C to +85°C |
| LTC2203CUK#PBF | 16-Bit, 25Msps ADC; Package: QFN; No of Pins: 48; Temperature Range: 0°C to +70°C |
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