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TC500ACPE View Datasheet(PDF) - Microchip Technology

Part NameTC500ACPE Microchip
Microchip Technology Microchip
DescriptionPrecision Analog Front Ends with Dual Slope ADC


TC500ACPE Datasheet PDF : 38 Pages
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TC500/A/510/514
TTIME
Converter Status
Auto-zero
Integrator 0
Voltage VINT
Comparator
Output
Undefined
Integrate
Full-scale Input
Reference
De-integrate
Overshoot Integrator
Output
Zero
Comparator Delay
0 For Negative Input
1 For Positive Input
A
AB Inputs
B
Controller
Operation
A=0
B=1
Begin Conversion with
Auto-Zero Phase
A=1
B=0
Time Input
Integration
Phase
Sample Input Polarity
A=1
B=1
Capture
De-integration
Time
A=0
B=0
Integrator Ready for Next
Output
Conversion
Zero Phase (Auto-Zero is
Complete Idle State)
Typically = TINT
TINT
(Positive Input Shown)
Notes: The length of this phase is chosen almost arbitrarily
but needs to be long enough to null out worst case errors
(see text).
Comparator Delay +
Processor Latency
Minimizing
Overshoot
will Minimize
I.O.Z. Time
FIGURE 5-1:
Typical Dual Slope A/D Converter System Timing.
DS21428E-page 12
© 2008 Microchip Technology Inc.
Direct download click here

General Description:
TheTC500/A/510/514 family are precision analog front ends that implement dual slope A/D converters having a maximum resolution of 17 bits plus sign. As a minimum, each device contains the integrator, zero crossing comparator and processor interface logic. The TC500 is the base (16-bit max) device and requires both positive and negative power supplies. The TC500A is identical to the TC500 with the exception that it has improved linearity, allowing it to operate to a maximum resolution of 17 bits. The TC510 adds an on board negative power supply converter for single supply operation. The TC514 adds both a negative power supply converter and a 4-input differential analog multiplexer.

Features:
• Precision (up to 17 bits) A/D Converter “Front End”
• 3-Pin Control Interface to Microprocessor
• Flexible: User Can Trade-off Conversion Speed for Resolution
• Single-Supply Operation (TC510/TC514)
• 4 Input, Differential Analog MUX (TC514)
• Automatic Input Voltage Polarity Detection
• Low Power Dissipation:
   - (TC500/TC500A): 10 mW
   - (TC510/TC514): 18 mW
• Wide Analog Input Range:
   - ±4.2V (TC500A/TC510)
• Directly Accepts Bipolar and Differential Input Signals

Applications:
• Precision Analog Signal Processor
• Precision Sensor Interface
• High Accuracy DC Measurements

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