AME811A datasheet(9/15 Pages) AME

Part #	AME811A

Description	3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs

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Manufacturer	AME [Analog Microelectronics]

Direct Link	http://www.ame.com.tw/

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Analog Microelectronics, Inc.

9

AME811/AME811A/AME811R

3-1/2 Digit A/D Converter - Low Power

With HOLD And Differential Reference Inputs

n

n Digital Section

Digital Ground

AME811 generates an internal digital ground, typically

5V below the V+.

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 “OSC2”

3. A R-C oscillator using “OSC1”, “OSC2” 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 timing of each phase are as follows:

For signals less than full-scale, the unused reference

integration time is assigned to the autozero phase.

Segment Drivers

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 AME811 is pulled

to V+, all segments are turned “ON”. The display 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 SEV-

ERAL MINUTES! LCD displays may be destroyed if

operated with DC levels for extended periods.

Auto-Zero Phase:

1000 to 3000 Counts

Signal Integration Phase:

1000 Counts (Fixed)

Reference Integration Phase :

0 to 2000 Counts

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