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TC850IJL Datasheet(PDF) 9 Page - Microchip Technology

Part # TC850IJL
Description  15-Bit, Fast Integrating CMOS A/D Converter
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC850IJL Datasheet(HTML) 9 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
DS21479C-page 9
TC850
4.0
ANALOG SECTION
DESCRIPTION
The TC850 analog section consists of an input buffer
amplifier, integrator amplifier, comparator and analog
switches. A simplified block diagram is shown in
Figure 4-1.
4.1
Conversion Timing
Each conversion consists of three phases:
1.
Zero Integrator
2.
Signal Integrate
3.
Reference Integrate (or De-integrate)
Each conversion cycle requires 1280 internal clock
cycles (Figure 4-2).
FIGURE 4-1:
Analog Section Simplified Schematic
FIGURE 4-2:
Conversion Timing
RINT
INTIN
INTOUT
CINT
INT
INT
INT
Buffer*
BUFF
Integrator*
Comparator*
To Digital
Section
DE1
(+)
DE
DE
DE
Z1
DE
DE1
(+)
DE1
(-)
DE1
(-)
DE2
(+)
DE2
(-)
DE1
(+)
DE1
(-)
REF2+
+
-
+
–
+
–
TC850
CREF1+
CREF2-
CREF2
CREF1-
CREF2-
REF1+
REF1-
CREF1
IN+
IN-
ANALOG
COMMON
*Auto Zeroed Amplifiers
Conversion
Phase
Internal
Clock
Signal Integrate
Zero Integrator
Reference Integrate
1280 Clock Cyles
246
256
778
. . . . . . .
. . . . . . . . . . . .
. .


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