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AD976ACR Datasheet(PDF) 6 Page - Analog Devices |
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AD976ACR Datasheet(HTML) 6 Page - Analog Devices |
6 / 16 page ![]() AD976/AD976A –6– REV. C PIN FUNCTION DESCRIPTIONS Pin No. Mnemonic Description 1VIN Analog Input. Connect a 200 Ω resistor between V IN and the analog signal source. The full-scale input range is ±10 V. 2 AGND1 Analog Ground. Used as the ground reference point for the REF pin. 3 REF Reference Input/Output. The internal +2.5 V reference is available at this pin. Alternatively, an external reference can be used to override the internal reference. In either case, connect a 2.2 µF tantalum capacitor between REF and AGND1. 4 CAP Reference Buffer Output. Connect a 2.2 µF tantalum capacitor between CAP and AGND2. 5 AGND2 Analog Ground. 6 D15 (MSB) Data Bit 15. Most significant bit of conversion result. High impedance state when CS is HIGH or when R/C is LOW. 7–13 D14–D8 Data Bits 14–8. High impedance state when CS is HIGH or when R/C is LOW. 14 DGND Digital Ground. 15–21 D7–D1 Data Bits 7–1. High impedance state when CS is HIGH or when R/C is LOW. 22 D0 (LSB) Data Bit 0. Least significant bit of conversion result. High impedance state when CS is HIGH or when R/C is LOW. 23 BYTE Byte Select. With BYTE LOW, data will be output as indicated above; Pin 6 (D15) is the MSB, Pin 22 (D0) is the LSB. With BYTE HIGH, the top and bottom 8 bits of data will be switched; D15–D8 are output on Pins 15–22 and D7–D0 are output on Pins 6–13. 24 R/C Read/Convert Input. With CS LOW, a falling edge on R/C puts the internal sample/hold into the hold state and starts a conversion; a rising edge enables the output data bits. 25 CS Chip Select Input. Internally OR’d with R/C. With R/C LOW, a falling edge on CS will initiate a conversion. With R/C HIGH, a falling edge on CS will enable the output data bits. When CS is HIGH, the output data bits will be in the Hi-impedance state. 26 BUSY Busy Output. Goes LOW when a conversion is started and remains LOW until the conversion is completed and the data is latched into the output register. With CS tied LOW and R/C HIGH, output data will be valid when BUSY rises. The rising edge of BUSY can be used to latch the out- put data. 27 VANA Analog Power Supply. Nominally +5 V. 28 VDIG Digital Power Supply. Nominally +5 V. DEFINITION OF SPECIFICATIONS INTEGRAL NONLINEARITY ERROR (INL) Linearity error refers to the deviation of each individual code from a line drawn from “negative full scale” to “positive full scale.” The point used as negative full scale occurs 1/2 LSB before the first code transition. Positive full scale is defined as a level 1 1/2 LSB beyond the last code transition. The deviation is measured from the middle of each particular code to the true straight line. 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) should occur for an analog voltage 1 1/2 LSB below the nominal full scale (9.9995422 V for a ±10 V range). The full-scale error is the deviation of the actual level of the last transition from the ideal level. BIPOLAR ZERO ERROR Bipolar zero error is the difference between the ideal midscale input voltage (0 V) and the actual voltage producing the midscale output code. INPUT BANDWIDTH The input bandwidth is that frequency at which the amplitude of the reconstructed fundamental is reduced by 3 dB for a full- scale input. FULL-POWER BANDWIDTH Full-power bandwidth is defined as the full-scale input fre- quency at which signal to (Noise + Distortion) degrades to 60 dB, as 10 bits of accuracy. APERTURE DELAY Aperture delay is a measure of the Sample-and-Hold Amplifier (SHA) performance and is measured from the rising edge of the clock input to when the input signal is held for a conversion. |
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