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PBV-R050-0.5 Datasheet(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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PBV-R050-0.5 Datasheet(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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11 / 18 page  11 Definitions Integral Nonlinearity (INL) INL is the maximum deviation of a transfer curve from a straight line passing through the endpoints of the ADC transfer function, with offset and gain errors adjusted out. Differential Nonlinearity (DNL) DNL is the deviation of an actual code width from the ideal value of 1 LSB between any two adjacent codes in the ADC transfer curve. DNL is a critical specification in closed-loop applications. A DNL error of less than ±1 LSB guarantees no missing codes and a monotonic transfer function. Offset Error Offset error is the deviation of the actual input voltage corresponding to the mid-scale code (32,768 for a 16-bit system with an unsigned decimation filter) from 0 V. Offset error can be corrected by software or hardware. Gain Error (Full-Scale Error) Gain error includes positive full-scale gain error and negative full-scale gain error. Positive full-scale gain error is the deviation of the actual input voltage correspond- ing to positive full-scale code (65,535 for a 16-bit system) from the ideal differential input voltage (VIN+ – VIN– = +320 mV), with offset error adjusted out. Negative full- scale gain error is the deviation of the actual input voltage corresponding to negative full-scale code (0 for a 16-bit system) from the ideal differential input voltage (VIN+ – VIN– = -320 mV), with offset error adjusted out. Gain error includes reference error. Gain error can be corrected by software or hardware. Signal-to-Noise Ratio (SNR) The SNR is the measured ratio of AC signal power to noise power below half of the sampling frequency. The noise power excludes harmonic signals and DC. Signal-to-(Noise + Distortion) Ratio (SNDR) The SNDR is the measured ratio of AC signal power to noise plus distortion power at the output of the ADC. The signal power is the rms amplitude of the fundamental input signal. Noise plus distortion power is the rms sum of all non-fundamental signals up to half the sampling frequency (excluding DC). Effective Number of Bits (ENOB) The ENOB determines the effective resolution of an ADC, expressed in bits, defined by ENOB = (SNDR − 1.76)/6.02 Isolation Transient Immunity (CMR) The isolation transient immunity (also known as Common- Mode Rejection or CMR) specifies the minimum rate-of- rise/fall of a common-mode signal applied across the isolation boundary beyond which the modulator clock or data is corrupted. Product Overview Description The ACPL-7970 isolated sigma-delta (∑- ∆) modulator converts an analog input signal into a high-speed (10 MHz typical) single-bit data stream by means of a sigma- delta over-sampling modulator. The time average of the modulator data is directly proportional to the input signal voltage. The modulator uses internal clock of 10 MHz. The modulator data are encoded and transmitted across the isolation boundary where they are recovered and decoded into high-speed data stream of digital ones and zeros. The original signal information is represented by the density of ones in the data output. The other main function of the modulator (optocoupler) is to provide galvanic isolation between the analog signal input and the digital data output. It provides high noise margins and excellent immunity against isolation-mode transients that allows direct measurement of low-level signals in highly noisy environments, for example mea- surement of motor phase currents in power inverters. With 0.5 mm minimum DTI, the ACPL-7970 provides reliable double protection and high working insulation voltage, which is suitable for fail-safe designs. This out- standing isolation performance is superior to alternatives including devices based on capacitive- or magnetic- coupling with DTI in micro-meter range. Offered in an DIP-8 package, the isolated ADC delivers the reliability, small size, superior isolation and over-temperature perfor- mance motor drive designers need to accurately measure current at much lower price compared to traditional current transducers. |
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