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AME7107RCPL Datasheet(PDF) 10 Page - Analog Microelectronics |
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AME7107RCPL Datasheet(HTML) 10 Page - Analog Microelectronics |
10 / 20 page AME, Inc. 10 AME7106/AME7106A/AME7106R AME7107/AME7107A/AME7107R 3-1/2 Digit A/D Converter High Accuracy, Low Power n n n n n Digital Section Digital Ground AME7106 generates an internal digital ground, typically 5V below the V+. The digital ground of AME7107 is supplied externally. Clock Circuit The clock can be generated in either of the following three methods. 1. An external oscillator connected to“OSC1” 2. A crystal between pins” OSC1” and “OOSC2” 3. A R-C oscillator using “OOSC1”, “OOSC2” and “OSC3” Notes: There is no on-chip feedback resister across osc1 and osc2. Systems Timing The oscillator frequency is divided by 4 prior to clock- ing the internal decade counters. Each conversion takes 4000 counts or 16000 oscillator clock pulses. The tim- ing of each phase are as follows: Auto-Zero Phase: 1000 to 3000 Counts Signal Integration Phase: 1000 Counts (Fixed) Reference Integration Phase : 0 to 2000 Counts For signals less than full-The A/D conversion has the following three phases:scale, the unused reference integration time is assigned to the autozero phase. Segment Drivers (AME7106) The backplane frequency is 1/800 of the oscillator clock frequency. For example if the oscillator frequency is 48 KHz (3 conversions per second) the backplane fre- quency will be 60 Hz. The segment and backplane are at the same frequency with a nominal 5 volt amplitude. The segment is visible (ON) when the segment and the backplane are out of phase, otherwise it is invisible (OFF). The polarity segment is “ON” for negative ana- log inputs. When the TEST pin on the AME7106 is pulled to V+, all segments are turned “ON”. The dis- play reads -1888. During this mode the LCD segments have a constant DC voltage impressed. DO NOT LEAVE THE DISPLAY IN THIS MODE FOR MORE THAN SEVERAL MINUTES! LCD displays may be destroyed if operated with DC levels for extended periods. |
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