tc500a Microchip Technology Inc., tc500a Datasheet - Page 10

• Manufacturer Part Number: tc500a
• Description: Precision Analog Front Ends
• Manufacturer: Microchip Technology Inc.

TC500/A/510/514
FIGURE 5-1:
DS21428D-page 10
Controller
Operation
T
Converter Status
Integrator
Voltage V
Comparator
Output
AB Inputs
TIME
Notes:
INT
A
B
0
The length of this phase is chosen almost arbitrarily
but needs to be long enough to null out worst case errors
(see text).
Begin Conversion with
Auto-Zero Phase
(Positive Input Shown)
Typically = T
Auto-zero
Undefined
Typical Dual Slope A/D Converter System Timing.
A = 0
B = 1
INT
Full-scale Input
Sample Input Polarity
0 For Negative Input
1 For Positive Input
Integrate
Time Input
Integration
Phase
T
B = 0
A = 1
INT
Comparator Delay
De-integrate
Capture
De-integration
Time
Reference
A = 1
B = 1
Comparator Delay +
Processor Latency
Overshoot Integrator
Output
Zero Phase
Complete
Integrator
© 2006 Microchip Technology Inc.
Output
Zero
A = 0
B = 0
Ready for Next
Conversion
(Auto-Zero is
Idle State)
Minimizing
Overshoot
will Minimize
I.O.Z. Time