TLC548C, TLC548I, TLC549C, TLC549I

8-BIT ANALOG-TO-DIGITAL CONVERTERS

WITH SERIAL CONTROL

SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996

5

POST OFFICE BOX 655303

electrical characteristics over recommended operating free-air temperature range,

(unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VOH

High-level output voltage

VCC = 4.75 V, IOH = – 360 µA

2.4

V

VOL

Low-level output voltage

VCC = 4.75 V, IOL = 3.2 mA

0.4

V

IOZ

High impedance off state output current

VO = VCC,

CS at VCC

10

µA

IOZ

High-impedance off-state output current

VO = 0,

CS at VCC

–10

µA

IIH

High-level input current, control inputs

VI = VCC

0.005

2.5

µA

IIL

Low-level input current, control inputs

VI = 0

– 0.005

– 2.5

µA

II( )

Analog channel on-state input current during sample

Analog input at VCC

0.4

1

µA

II(on)

gg

cycle

Analog input at 0 V

– 0.4

–1

µA

ICC

Operating supply current

CS at 0 V

1.8

2.5

mA

ICC + Iref

Supply and reference current

Vref+ = VCC

1.9

3

mA

Ci

Input capacitance

Analog inputs

7

55

pF

Ci

Input capacitance

Control inputs

5

15

pF

operating characteristics over recommended operating free-air temperature range,

(unless otherwise noted)

PARAMETER

TEST CONDITIONS

TLC548

TLC549

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

EL

Linearity error

See Note 6

±0.5

±0.5

LSB

EZS

Zero-scale error

See Note 7

±0.5

±0.5

LSB

EFS

Full-scale error

See Note 7

±0.5

±0.5

LSB

Total unadjusted error

See Note 8

±0.5

±0.5

LSB

tconv

Conversion time

See Operating Sequence

8

17

12

17

µs

Total access and conversion time

See Operating Sequence

12

22

19

25

µs

ta

Channel acquisition time (sample cycle)

See Operating Sequence

4

4

I/O

clock

cycles

tv

Time output data remains

valid after I/O CLOCK

↓

10

10

ns

td

Delay time to data output valid

I/O CLOCK

↓

200

400

ns

ten

Output enable time

1.4

1.4

µs

tdis

Output disable time

150

150

ns

tr(bus)

Data bus rise time

See Figure 1

300

300

ns

tf(bus)

Data bus fall time

300

300

ns

NOTES:

6. Linearity error is the deviation from the best straight line through the A/D transfer characteristics.

7. Zero-scale error is the difference between 00000000 and the converted output for zero input voltage; full-scale error is the difference

between 11111111 and the converted output for full-scale input voltage.

8. Total unadjusted error is the sum of linearity, zero-scale, and full-scale errors.