ame7106 AME, Inc., ame7106 Datasheet - Page 10

• Manufacturer Part Number: ame7106
• Description: 3-1/2 Digit A/d Converter High Accuracy, Low Power
• Manufacturer: AME, Inc.

n Digital Section
Digital Grond
5V below the V+. The digital ground of AME7107 is sup-
plied externally.
Clock Circuit
three methods.
Notes: There is no on-chip feedback resister across osc1 and
osc2.
Systems Timing
ing the internal decade counters. Each conversion takes
4000 counts or 16000 oscillator clock pulses. The timing
of each phase are as follows:
10
AME7106 / 7106A / 7106R
AME7107 / 7107A / 7107R
1) An external oscillator connected to“ OSC1”
2) A crystal between pins“ OSC1” and “ OSC2”
3) A R-C oscillator using “ OSC1” , “ OSC1” and
AME7106 generates an internal digital ground, typically
The clock can be generated in either of the following
The oscillator frequency is divided by 4 prior to clock-
“ OSC3”
AME, Inc.
Figure8. Clock Circuits
following three phases:scale, the unused reference in-
tegration time is assigned to the autozero phase.
Segment Drivers (AME7106)
frequency. For example if the oscillator frequency is 48
KHz (3 conversions per second) the backplane frequency
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 analog inputs.
When the TEST pin on the AME7106 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 SEVERAL MINUTES!
LCD displays may be destroyed if operated with DC lev-
els for extended periods.
For signals less than full-The A/D conversion has the
The backplane frequency is 1/800 of the oscillator clock
Auto-Zero Phase
Signal Integration Phase
Reference Integration Phase
High Accuracy, Low Power
3-1/2 Digit A/D Converter
1000 to 3000 Counts
1000 Counts (Fixed)
0 to 2000 Counts
Rev.H.02