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AD7675AST Datasheet(PDF) 7 Page - Analog Devices |
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AD7675AST Datasheet(HTML) 7 Page - Analog Devices |
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7 / 20 page  REV. 0 AD7675 –7– DEFINITION OF SPECIFICATIONS INTEGRAL NONLINEARITY ERROR (INL) Integral Nonlinearity is the maximum deviation of a straight line drawn through the transfer function of the actual ADC. The deviation is measured from the middle of each code. DIFFERENTIAL NONLINEARITY ERROR (DNL) In an ideal ADC, code transitions are 1 LSB apart. Differential nonlinearity is the maximum deviation from this ideal value. It is often specified in terms of resolution for which no missing codes are guaranteed. +FULL-SCALE ERROR The last transition (from 011 . . . 10 to 011 . . . 11 in two’s complement coding) should occur for an analog voltage 1 1/2 LSB below the nominal +full scale (+2.499886 V for the ±2.5 V range). The +full-scale error is the deviation of the actual level of the last transition from the ideal level. –FULL-SCALE ERROR The first transition (from 100 . . . 00 to 100 . . . 01 in two’s complement coding) should occur for an analog voltage 1 1/2 LSB above the nominal –full scale (–2.499962 V for the ±2.5 V range). The –full-scale error is the deviation of the actual level of the last transition from the ideal level. BIPOLAR ZERO ERROR The bipolar zero error is the difference between the ideal midscale input voltage (0 V) and the actual voltage producing the midscale output code. SPURIOUS FREE DYNAMIC RANGE (SFDR) The difference, in decibels (dB), between the rms amplitude of the input signal and the peak spurious signal. EFFECTIVE NUMBER OF BITS (ENOB) ENOB is a measurement of the resolution with a sine wave input. It is related to S/(N+D) by the following formula: ENOB S N D dB =+ [] () /– . / . 176 6 02 and is expressed in bits. TOTAL HARMONIC DISTORTION (THD) THD is the ratio of the rms sum of the first five harmonic components to the rms value of a full-scale input signal and is expressed in decibels. SIGNAL-TO-NOISE RATIO (SNR) SNR is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, excluding harmonics and dc. The value for SNR is expressed in decibels. SIGNAL-TO-(NOISE + DISTORTION) RATIO (S/[N+D]) S/(N+D) is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for S/(N+D) is expressed in decibels. APERTURE DELAY Aperture delay is a measure of the acquisition performance and is measured from the falling edge of the CNVST input to when the input signal is held for a conversion. TRANSIENT RESPONSE The time required for the AD7675 to achieve its rated accuracy after a full-scale step function is applied to its input. PIN CONFIGURATION 48-Lead LQFP (ST-48) 36 35 34 33 32 31 30 29 28 27 26 25 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 48 47 46 45 44 39 38 37 43 42 41 40 PIN 1 IDENTIFIER TOP VIEW (Not to Scale) AD7675 AGND CNVST PD RESET CS RD DGND AGND AVDD NC BYTESWAP OB/ 2C NC NC NC = NO CONNECT SEP/ PAR D0 D1 D2/DIVSCLK[0] BUSY D15 D14 D13 D3/DIVSCLK[1] D12 |
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