ALD500R-50PE Advanced Linear Devices, ALD500R-50PE Datasheet
ALD500R-50PE
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ALD500R-50PE Summary of contents
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... Contact factory for customized voltage reference voltage levels, accuracy and tempco specifications. Rev. 1.01 © 1999 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706 Tel: (408) 747-1155, Fax: (408) 747-1286 WITH PRECISION VOLTAGE REFERENCE Ordering Information 20L PDIP 20L SOIC ALD500R-50PE ALD500R-50SE ALD500RA-20PE ALD500RA-20SE ALD500RAU-20PE ALD500RAU-20SE ...
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... This reading, when ratioed against the reference voltage, yields an accurate, absolute voltage measurement reading. The ALD500R analog processors consist of on-chip digital control circuitry to accept control inputs, integrating buffer amplifiers, analog switches, and voltage comparators and a highly accurate, ultra-stable voltage reference. ...
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... Unknown time period over which a known DINT ANALOG INPUT ( VOLTAGE REFERENCE ALD500RAU/ALD500RA/ALD500R V REF C INT R INT Actual data conversion is accomplished in two phases: Input Signal Integration Phase and Reference Voltage Deintegration Phase. The integrator output is initialized to 0V prior to the start of Input Signal Integration Phase. During Input Signal Integration ...
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... Notes 1, 2 0.020 +70 C 0.003 0.008 % Notes 1, 2 0.015 +70 C 0.3 0 +70 C 0.15 0.35 ppm/ C Notes 0.012 % 1.3 ppm +70 C Note -1 -0 AGND = ALD500RAU/ALD500RA/ALD500R ...
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... Typ Max 0.6 1.0 0.6 1 5.5 4.5 5.5 -5.5 -4.5 -5 0.4 0.4 3.5 1 0.01 0. Figure 3. ALD500R TIMING DIAGRAM 1 Conversion Cycle 0.5416 s 123,093 Clock Pulses 66.667 msec. Input Signal Reference Integration Voltage Phase Deintegration Phase Variable Fixed number number of of clock pulses clock pulses. by design max. number of clock pulses ~ = 246,185 ...
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... 2.0V Full Scale INT characteristics. ~ REF AZ Advanced Linear Devices = 0. 100K (1% metal film) REF REF 500RAU-50 Unit 500RA-50 500R-50 Min Typ Max 1.000 1.005 ppm/C -0.08 ppm/ 1000hrs 10 min. 5.5 4.5 5.5 V -4.5 -5.5 -4 ALD500RAU/ALD500RA/ALD500R Test Conditions Note 7 Note 7 Note 7 ...
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... Integrator Output Zero *SW + would be closed for a positive input signal ALD500RAU/ALD500RA/ALD500R is HIGH during the Integration phase when a positive input voltage is being integrated and OUT is undefined during the Auto-Zero phase. It should be monitored to OUT Logic 1 = power on. Logic 0 = power down. Switch Functions ...
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... The Integrator Output Zero phase should be activated (AB = 00) until C high. At this point, the integrator output is near zero. Auto Zero Phase should be entered (AB = 01) and the ALD500RAU/ ALD500RA/ALD500R is held in this state until the next conversion cycle. Advanced Linear Devices ...
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... Phase Control Inputs (A, B) The A and B logic inputs select the ALD500RAU/ALD500RA/ ALD500R operating phase. The A and B inputs are normally driven by a microprocessor I/O port or external logic, using CMOS logic levels. For logic control functions of A and B logic inputs, see Table 1. ...
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... C REF C and C AZ REF Calculate V REF The reference deintegration voltage is calculated using: V REF The ALD500RAU/ALD500RA/ALD500R requires an external is a INT order to operate properly. This R REF metal film 100K resistor, 50 ppm/C. Any other loading must . REF be high impedance ( 100M ). Converter Noise The converter noise is the total algebraic sum of the integrator ...
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... MAX DINT For t MAX = DINT INT equation (9) becomes MAX INT INT V = REF 2t INT ALD500RAU/ALD500RA/ALD500R DESIGN EXAMPLES We now apply these equations in the following design examples (1) DINT Design Example INT INT 1. Pick resolution = 16 bit. 2. Pick t t DINT (2) C INT (2a) 3 ...
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... INT range = 100 K For INT - (0.133333 INT = C = 0.67 F REF 266.667 msec. DINT INT as shown in Design Example 1, REF substituting the appropriate values MAX R INT INT INT V = REF t MAX DINT ~ = 1.005V ALD500RAU/ALD500RA/ALD500R ~ -6 )/4 = 0.67 F ...