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ALD500RA-10PE Datasheet(PDF) 7 Page - Advanced Linear Devices |
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ALD500RA-10PE Datasheet(HTML) 7 Page - Advanced Linear Devices |
7 / 12 page ALD500RAU/ALD500RA/ALD500R Advanced Linear Devices 7 1IB Bias circuit pin. Connect a 0.1 µF capacitor from this pin to V- to minimize noise. 2CINT Integrator capacitor connection. 3V- Negative power supply. 4CAZ The Auto-zero capacitor connection. 5 BUF The Integrator resistor buffer connection. 6 AGND This pin is analog ground. 7C-REF Negative reference capacitor connection. 8C+REF Positive reference capacitor connection. 9 N/C Internally connected. Connect to V- for normal operation. 10 N/C Internally connected. Connect to V- for normal operation. 11 V-REF External voltage reference (-) connection. High impedance load ( ≥100MΩ) only. 12 V+REF External voltage reference (+) connection. High impedance load ( ≥100MΩ) only. 13 V-IN Negative analog input. 14 V+IN Positive analog input. 15 A Converter phase control MSB Input. 16 B Converter phase control LSB Input. 17 COUT Comparator output. COUT is HIGH during the Integration phase when a positive input voltage is being integrated and is LOW when a negative input voltage is being integrated. A HIGH-to-LOW transition on COUT signals the processor that the Deintegrate phase is completed. COUT is undefined during the Auto-Zero phase. It should be monitored to time the Integrator Zero phase. 18 DGND Digital ground. 19 V+ Positive power supply. 20 CS Chip select - power down pin. Logic 1 = power on. Logic 0 = power down. Switch Functions Input Reference Input Auto Zero Reference VIN=AGND System Connect Polarity Sample Offset Conversion Control Phase Logic SWIN SW+R or SW-R SWAZ SWR SWG SWS Auto Zero A = 0, B = 1 Open Open Closed Closed Closed Open Input Signal A = 1, B = 0 Closed Open Open Open Open Open Integration Reference Voltage A = 1, B = 1 Open Closed* Open Open Closed Open Deintegration Integrator A = 0, B = 0 Open Open Open Closed Closed Closed Output Zero *SW+R would be closed for a positive input signal. SW-R would be closed for a negative input signal. PIN DESCRIPTION Pin No. Symbol Description Table 1. Conversion Phase and Control Logic Internal Analog Switch Functions |
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