TLC0834C, TLC0834I, TLC0838C, TLC0838I

8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL

SLAS094E – MARCH 1995 – REVISED OCTOBER 2000

8

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

electrical characteristics over recommended range of operating free-air temperature, VCC = 5 V,

f(clock) = 250 kHz (unless otherwise noted) (continued)

analog and converter section

PARAMETER

TEST CONDITIONS†

MIN

TYP‡

MAX

UNIT

– 0.05

VIC

Common-mode input voltage

See Note 3

to

V

IC

g

VCC+ 0.05

On channel

VI = 5 V

1

II( tdb )

Standby input current (see Note 4)

Off channel

VI = 0

–1

µA

II(stdby)

Standby input current (see Note 4)

On channel

VI = 0

–1

µA

Off channel

VI = 5 V

1

ri(REF)

Input resistance to REF

1.3

2.4

5.9

k

Ω

† All parameters are measured under open-loop conditions with zero common-mode input voltage.

‡ All typical values are at VCC = 5 V, TA = 25°C.

NOTES:

3. When channel IN – is more positive than channel IN+, the digital output code is 0000 0000. Connected to each analog input are

two on-chip diodes that conduct forward current for analog input voltages one diode drop above VCC.Care must be taken during

testing at low VCC levels (4.5 V) because high-level analog input voltage (5 V) can, especially at high temperatures, cause the input

diode to conduct and cause errors for analog inputs that are near full scale. As long as the analog voltage does not exceed the supply

voltage by more than 50 mV, the output code is correct. To achieve an absolute 0- to 5-V input range requires a minimum VCC of

4.950 V for all variations of temperature and load.

4. Standby input currents go in or out of the on or off channels when the A/D converter is not performing conversion and the clock is

in a high or low steady-state condition.

total device

PARAMETER

MIN

TYP‡

MAX

UNIT

ICC

Supply current

0.6

1.25

mA

‡ All typical values are at VCC = 5 V, TA = 25°C.

operating characteristics, VCC = 5 V, f(clock) = 250 kHz, tr = tf = 20 ns, TA = 25°C (unless otherwise

noted)

PARAMETER

TEST CONDITIONS§

MIN

TYP

MAX

UNIT

Supply-voltage variation error

VCC = 4.75 V to 5.25 V

±1/16

±1/4

LSB

Total unadjusted error (see Note 5)

Vref = 5 V,

TA = MIN to MAX

±1

LSB

Common-mode error

Differential mode

±1/16

±1/4

LSB

t d

Propagation delay time, output

MSB-first data

CL = 100 pF

1500

ns

tpd

gy

,

data after CLK

↓ (see Note 6 and Figure 2)

LSB-first data

CL = 100 pF

600

ns

tdi

Output disable time DO or SARS after CS

↑ (see Figure 3)

CL = 10 pF,

RL = 10 kΩ

250

ns

tdis

Output disable time, DO or SARS after CS

↑ (see Figure 3)

CL = 100 pF, RL = 2 kΩ

500

ns

tc

Conversion time (multiplexer-addressing time not included)

8

clock

periods

§ All parameters are measured under open-loop conditions with zero common-mode input voltage. For conditions shown as MIN or MAX, use the

appropriate value specified under recommended operating conditions.

NOTES:

5. Total unadjusted error includes offset, full-scale, linearity, and multiplexer errors.

6. The MSB-first data is output directly from the comparator and, therefore, requires additional delay to allow for comparator response

time.