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TLC548C Datasheet(PDF) 4 Page - Texas Instruments

Part # TLC548C
Description  8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLC548C Datasheet(HTML) 4 Page - Texas Instruments

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TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
TLC548
TLC549
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
Supply voltage, VCC
3
5
6
3
5
6
V
Positive reference voltage, Vref+ (see Note 3)
2.5
VCC VCC+0.1
2.5
VCC VCC+0.1
V
Negative reference voltage, Vref – (see Note 3)
– 0.1
0
2.5
–0.1
0
2.5
V
Differential reference voltage, Vref+, Vref – (see Note 3)
1
VCC VCC+0.2
1
VCC VCC+0.2
V
Analog input voltage (see Note 3)
0
VCC
0
VCC
V
High-level control input voltage, VIH (for VCC = 4.75 V to 5.5 V)
2
2
V
Low-level control input voltage, VIL (for VCC = 4.75 V to 5.5 V)
0.8
0.8
V
Input/output clock frequency, fclock(I/O) (for VCC = 4.75 V to 5.5 V)
0
2.048
0
1.1
MHz
Input/output clock high, twH(I/O) (for VCC = 4.75 V to 5.5 V)
200
404
ns
Input/output clock low, twL(I/O) (for VCC = 4.75 V to 5.5 V)
200
404
ns
Input/output clock transition time, tt(I/O)
(for VCC = 4.75 V to 5.5 V) (see Note 4 and Operating Sequence)
100
100
ns
Duration of CS input high state during conversion, twH(CS)
(for VCC = 4.75 V to 5.5 V) (see Operating Sequence)
17
17
µs
Setup time, CS low before first I/O CLOCK, tsu(CS)
(for VCC = 4.75 V to 5.5 V) (see Note 5)
1.4
1.4
µs
TLC548C, TLC549C
0
70
0
70
°C
TLC548I, TLC549I
–40
85
–40
85
°C
NOTES:
3. Analog input voltages greater than that applied to REF+ convert to all ones (11111111), while input voltages less than that applied
to REF– convert to all zeros (00000000). For proper operation, the positive reference voltage Vref+, must be at least 1 V greater than
the negative reference voltage, Vref–. In addition, unadjusted errors may increase as the differential reference voltage, Vref+ – Vref– ,
falls below 4.75 V.
4. This is the time required for the I/O CLOCK input signal to fall from VIH min to VIL max or to rise from VIL max to VIH min. In the vicinity
of normal room temperature, the devices function with input clock transition time as slow as 2
µs for remote data acquisition
applications in which the sensor and the ADC are placed several feet away from the controlling microprocessor.
5. To minimize errors caused by noise at the CS input, the internal circuitry waits for two rising edges and one falling edge of internal
system clock after CS
↓ before responding to control input signals. This CS setup time is given by the ten and tsu(CS) specifications.


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