
TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range,
VCC = Vref+ = 4.75 V to 5.5 V, fclock(I/O) = 2.048 MHz for TLC548 or 1.1 MHz for TLC549
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VOH
High-level output voltage
VCC = 4.75 V, IOH = – 360 A
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
A
IOZ
High-impedance off-state output current
VO = 0,
CS at VCC
–10
A
IIH
High-level input current, control inputs
VI = VCC
0.005
2.5
A
IIL
Low-level input current, control inputs
VI = 0
– 0.005
– 2.5
A
II( )
Analog channel on-state input current during sample
Analog input at VCC
0.4
1
A
II(on)
gg
cycle
Analog input at 0 V
– 0.4
–1
A
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,
VCC = Vref+ = 4.75 V to 5.5 V, fclock(I/O) = 2.048 MHz for TLC548 or 1.1 MHz for TLC549
PARAMETER
TEST CONDITIONS
TLC548
TLC549
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
EL
Linearity error
See Note 6
±0.5
EZS
Zero-scale error
See Note 7
±0.5
LSB
EFS
Full-scale error
See Note 7
±0.5
LSB
Total unadjusted error
See Note 8
±0.5
LSB
tconv
Conversion time
See Operating Sequence
8
17
12
17
s
Total access and conversion time
See Operating Sequence
12
22
19
25
s
ta
Channel acquisition time (sample cycle)
See Operating Sequence
4
I/O
clock
cycles
tv
Time output data remains
valid after I/O CLOCK
↓
10
ns
td
Delay time to data output valid
I/O CLOCK
↓
200
400
ns
ten
Output enable time
1.4
s
tdis
Output disable time
150
ns
tr(bus)
Data bus rise time
See Figure 1
300
ns
tf(bus)
Data bus fall time
300
ns
All typicals are at VCC = 5 V, TA = 25°C.
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.