TC850CPL datasheet(9/26 Pages) MICROCHIP

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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:

Zero Integrator

Signal Integrate

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

Buffer*

BUFF

Integrator*

Comparator*

To Digital

Section

DE1

(+)

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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