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ALD523DPH Datasheet(PDF) 4 Page - Advanced Linear Devices |
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ALD523DPH Datasheet(HTML) 4 Page - Advanced Linear Devices |
4 / 20 page © © © © 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286 ALD523D 12/01 http://www.aldinc.com 4 of 20 different operating modes. This feature becomes useful for applications that require multiple modes of operations where up to three different types of measurements are made and displayed. I. CALIBRATED REFERENCE MODE (MODE-A) The calibrated reference mode (mode-A) is primarily intended for measurements against a calibrated reference voltage. The reference voltage can either be internal or external. In this mode, the ALD523D runs its internal analog-to-digital controller to manage data conversion from an analog-to-digital converter chip with calibrated reference voltage such as the integrating dual slope precision analog processors ALD500R. One of the practical applications of utilizing this mode of operation is a precision digital voltmeter system design (see the Application Design Note-AN523DA). In this mode, ALD500 can also be used instead of the ALD500R, with an external voltage reference. The block diagram of mode-A is shown in figure 1. See ALD523D pin configuration and identification section for mode-A pin layout and description. Figure 1. Calibrated reference mode (mode-A) block diagram. II. RATIOMETRIC MODE (MODE-B) The ratiometric mode (mode-B) is primarily intended for measurements against a ratiometric reference voltage. In this mode, the ALD523D runs its internal analog-to-digital controller to manage data conversion from an analog-to- digital converter chip such as the integrating dual slope precision analog processors ALD500 with ratiometric reference voltage. One of the practical example applications of utilizing this mode of operation is a precision weigh scale system design (see the Application Design Note-AN523DB). The block diagram of mode-B is shown in figure 2. See ALD523D pin configuration and identification section for mode-B pin layout and description. Figure 2. Ratiometric mode (mode-B) block diagram. III. DISPLAY ONLY MODE (MODE-C) The display only mode (mode-C) is primarily intended for receiving a ready external serial binary data, converting and processing the data, and showing the processed data on the CDM. In this mode, the ALD523D runs its internal display controller to manage, process, and display the received serial binary data from a transmitting instrument or device. One of the applications of utilizing this mode of operation is an external interface to ALD MB1S precision digital voltmeter system. The block diagram of mode-C is shown in figure 3. See ALD523D pin configuration and identification section for mode-C pin layout and description. Figure 3. Display only mode (mode-C) block diagram. ALD523D CHARACTER DISPLAY MODULE (1-LINE) OR (2-LINES) FUNCTIONS SELECTORS ALD500R ANALOG INPUT 1K EEPROM ALD523D FUNCTIONS SELECTORS ALD500 ANALOG INPUT 1K EEPROM CHARACTER DISPLAY MODULE (1-LINE) OR (2-LINES) ALD523D FUNCTIONS SELECTORS EXTERNAL INSTRUMENT (SERIAL DATA) 1K EEPROM CHARACTER DISPLAY MODULE (1-LINE) OR (2-LINES) |
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