TC850 查看數據表（PDF） - Microchip Technology

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TC850

15-Bit, Fast Integrating CMOS A/D Converter

Microchip Technology 

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.

TC850

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).

CREF1+

CREF1

REF1+ REF1-

CREF2-

CREF1-

CREF2

REF2+

CREF2-

RINT

CINT

BUFF

INTIN

INTOUT

DE

DE

DE

DE

-

+

Integrator*

To Digital

–

–

Section

IN+

DE1 DE1

INT

(-)

(+)

DE1

(-)

DE1

(+)

Buffer*

+

+

Comparator*

DE1

DE1

DE2

DE2

Z1

(+)

(-)

(+)

(-)

ANALOG

COMMON

INT

INT

IN-

TC850

*Auto Zeroed Amplifiers

FIGURE 4-1:

Analog Section Simplified Schematic

Internal

Clock

Conversion

Phase

FIGURE 4-2:

.......

246

1280 Clock Cyles

..

............

256

778

Zero Integrator

Signal Integrate

Conversion Timing

Reference Integrate

© 2006 Microchip Technology Inc.

DS21479C-page 9

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