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參數(shù)資料
| 型號： | TC820CPL |
| 廠商： | TelCom Semiconductor, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE |
| 中文描述： | 3-3/4數(shù)字A / D轉(zhuǎn)換頻率計數(shù)器和邏輯探針轉(zhuǎn)爐 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TC820CPL |
3-160
TELCOM SEMICONDUCTOR, INC.
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
TC820
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
V
CM
exists in conjunction with a full-scale, negative differen-
tial signal. The negative signal drives the integrator output
positive along with V
CM
(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 V
DD
or V
DD
without increased linearity error.
Reference (V
DD
, V
SS
)
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.
DP3 DP2 DP1
0Hz – 3999Hz
4kHz – 39.99kHz
40kHz – 399.9kHz
400kHz
≥
DP3
DP2
DP1
NONE
DECIMAL POINT
fIN
Figure 5. TC820 Auto-Range Decimal Point Selection
vs Frequency Counter Input
HIGH
LOW
LCD
DRIVERS
DISABLE A/D CONVERTER
TO
BUZZER
DP0/LO
DP1/HI
LOGIC
CMOS
LOGIC
LEVELS
EXTERNAL
LOGIC LEVEL
DETECTION
AND PULSE
STRETCHING
V
DD
TC820
LOGIC
PROBE
INPUT
NC
LCD
Figure 6. Logic Probe Simplified Schematic
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