TC500/A/510/514
T
TIME
Converter Status
Auto-zero
Integrate
Full-scale Input
Reference
De-integrate
Overshoot Integrator
Output
Zero
Integrator
0
Voltage V
INT
Comparator Delay
Comparator
Output
Undefined
0
For Negative Input
1
For Positive Input
A
AB Inputs
B
Controller
Operation
A=
0
B=
1
A=
1
A=
1
B=
1
A=
0
B=
0
B=
0
Begin Conversion with
Auto-Zero Phase
Time Input
Integration
Phase
Sample Input Polarity
Capture
De-integration
Time
Integrator
Ready for Next
Output
Conversion
Zero Phase (Auto-Zero is
Complete
Idle State)
Typically = T
INT
(Positive Input Shown)
T
INT
Comparator Delay +
Processor Latency
Minimizing
Overshoot
will Minimize
I.O.Z. Time
Notes:
The length of this phase is chosen almost arbitrarily
but needs to be long enough to null out worst case errors
(see text).
FIGURE 5-1:
Typical Dual Slope A/D Converter System Timing.
DS21428E-page 12
©
2008 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
