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AD561JNZ 데이터시트(PDF) 4 Page - Analog Devices |
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AD561JNZ 데이터시트(HTML) 4 Page - Analog Devices |
4 / 8 page AD561 –4– REV. A THE AD561 OFFERS TRUE 10-BIT RESOLUTION OVER FULL TEMPERATURE RANGE Accuracy: Analog Devices defines accuracy as the maximum deviation of the actual, adjusted DAC output (see page 5) from the ideal analog output (a straight line drawn from 0 to FS – l LSB) for any bit combination. The AD561 is laser trimmed to 1/4 LSB (0.025% of FS) maximum error at +25 °C for the K and T versions – 1/2 LSB for the J and S. Monotonicity: A DAC is said to be monotonic if the output either increases or remains constant for increasing digital inputs such that the output will always be a single-valued function of the input. All versions of the AD561 are monotonic over their full operating temperature range. Differential Nonlinearity: Monotonic behavior requires that the differential nonlinearity error be less than 1 LSB both at +25 °C and over the temperature range of interest. Differential nonlinearity is the measure of the variation in analog value, normalized to full scale, associated with a 1 LSB change in digital input code. For example, for a 10 volt full scale output, a change of 1 LSB in digital input code should result in a 9.8 mV change in the analog output (1 LSB = 10 V × 1/1024 = 9.8 mV). If in actual use, however, a 1 LSB change in the input code results in a change of only 2.45 mV (1/4 LSB) in analog output, the differential nonlinearity error would be 7.35 mV, or 3/4 LSB The AD561K and T have a max differen- tial linearity error of 1/2 LSB. The differential nonlinearity temperature coefficient must also be considered if the device is to remain monotonic over its full operating temperature range. A differential nonlinearity tempera- ture coefficient of 2.5 ppm/ °C could, under worst case condi- tions for a temperature change of +25 °C to +125°C, add 0.025% (100 2.5 ppm/ °C of error). The resulting error could then be as much as 0.025% + 0.025% = 0.05% of FS (1/2 LSB represents 0.05% of FS). To be sure of accurate performance all versions of the AD561 are therefore 100% tested to be monotonic over the full operating temperature range. Figure 1. Chip Bonding Diagram CONNECTING THE AD561 FOR BUFFERED VOLTAGE OUTPUT The standard current-to-voltage conversion connections using an operational amplifier are shown here with the preferred trimming techniques. If a low offset operational amplifier (AD510, AD741L, AD301AL) is used, excellent performance can be obtained in many situations without trimming. (A 5 mV op amp offset is equivalent to 1/2 LSB on a 10 volt scale.) If a 25 Ω fixed resistor is substituted for the 50 Ω trimmer, unipolar zero will typically be within ±1/10 LSB (plus op amp offset), and full scale accuracy will be within ±1 LSB. Substituting a 25 Ω resistor for the 50 Ω bipolar offset trimmer will give a bipolar zero error typically within ±1 LSB. The AD509 is recommended for buffered voltage-output applications that require a settling time to ±1/2 LSB of one microsecond. The feedback capacitor is shown with the optimum value for each application; this capacitor is required to compensate for the 25 picofarad DAC output capacitance. ORDERING GUIDE ACCURACY GAIN T C PACKAGE MODEL1 TEMP RANGE @ +25 C (of FS/ C) OPTION2 AD561JD 0 °C to +70°C ±1/2 LSB max 80 ppm max D-16 AD561JN 0 °C to +70°C ±1/2 LSB max 80 ppm max N-16 AD561KD 0 °C to +70°C ±1/4 LSB max 30 ppm max D-16 AD561KN 0 °C to +70°C ±1/4 LSB max 30 ppm max N-16 AD561SD –55 °C to +125°C ±1/2 LSB max 60 ppm max D-16 AD561TD –55 °C to +125°C ±1/4 LSB max 30 ppm max D-16 AD561/883B –55 °C to +125°C* * * NOTES 1For details on grade and package offerings screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook or current AD561/883B data sheet. 2D = Ceramic DIP; N = Plastic DIP. *Refer to AD561/883B military data sheet. PIN CONFIGURATION TOP VIEW |
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