TC820CLW データシートの表示（PDF） - TelCom Semiconductor Inc => Microchip

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TC820CLW

3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE

TelCom Semiconductor Inc => Microchip 

TC820

DP3

fIN

DP2 DP1

DECIMAL POINT

0Hz – 3999Hz

4kHz – 39.99kHz

40kHz – 399.9kHz

≥ 400kHz

DP3

DP2

DP1

NONE

Figure 5. TC820 Auto-Range Decimal Point Selection

vs Frequency Counter Input

3-3/4 A/D CONVERTER WITH

FREQUENCY COUNTER

AND LOGIC PROBE

In systems where common-mode voltages exist, the

86dB common-mode rejection ratio minimizes error. Com-

mon-mode voltages do, however, affect the integrator out-

put level. A worst-case condition exists if a large, positive

VCM exists in conjunction with a full-scale, negative differen-

tial signal. The negative signal drives the integrator output

positive along with VCM (Figure 9). For such applications, the

integrator output swing can be reduced below the recom-

mended 2V full-scale swing. The integrator output will swing

within 0.3V of VDD or VDD without increased linearity error.

Reference (VDD, VSS)

The TC820 reference, like the analog signal input, has

true differential inputs. In addition, the reference voltage can

be generated anywhere within the power supply voltage of

the converter. The differential reference inputs permit

ratiometric measurements and simplify interfacing with sen-

sors, such as load cells and temperature sensors.

LOGIC

PROBE

INPUT

3-160

LCD

HIGH

LOW

EXTERNAL

LOGIC LEVEL

DETECTION

AND PULSE

STRETCHING

CMOS

LOGIC

LEVELS

DP0/LO

DP1/HI

VDD

LOGIC

LCD

DRIVERS

TC820

DISABLE A/D CONVERTER

TO

BUZZER

NC

Figure 6. Logic Probe Simplified Schematic

TELCOM SEMICONDUCTOR, INC.

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