Datasheet

TLC542C, TLC542I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 INPUTS
SLAS075C – FEBRUARY 1989 – REVISED JUNE 2001
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
operating characteristics over recommended operating free-air temperature range,
V
CC
= V
ref+
= 4.75 to 5.5 V, f
(clock I/O)
= 1 MHZ
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
E
L
Linearity error (see Note 5) ±0.5 LSB
E
ZS
Zero-scale error (see Note 6) See Note 2 ±0.5 LSB
E
FS
Full-scale error (see Note 6) See Note 2 ±0.5 LSB
Total unadjusted error (see Note 7) ±0.5 LSB
Self-test output code
Input A11 address = 1011,
See Note 8
01111101
(126)
128
10000011
(130)
t
c(1)
Conversion time See operating sequence 20 µs
t
c(2)
Total access and conversion cycle time See operating sequence 40 µs
t
(acq)
Channel acquisition time (sample cycle) See operating sequence 16 µs
t
(v)
Time output data remains valid after I/O CLK↓ See Figure 5 10 ns
t
d(IO-DATA)
Delay time, I/O CLK↓ to data output valid See Figure 5 400 ns
t
d(IO-EOC)
Delay time, 8th I/O CLK↓ to EOC↓ See Figure 6 500 ns
t
d(EOC-DATA)
Delay time, EOC↑ to data out (MSB) See Figure 7 400 ns
t
PZH
, t
PZL
Delay time, CS↓ to data out (MSB) See Figure 2 3.4 µs
t
PHZ
, t
PLZ
Delay time, CS↑ to data out (MSB) See Figure 2 150 ns
t
r(EOC)
Rise time See Figure 7 100 ns
t
f(EOC)
Fall time See Figure 6 100 ns
t
r(bus)
Data bus rise time See Figure 5 300 ns
t
f(bus)
Data bus fall time See Figure 5 300 ns
†
All typical values are at T
A
= 25°C.
NOTES: 2. 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, REF+ must be at least 1 V higher than REF–. Also, the total
unadjusted error may increase as this differential reference voltage falls below 4.75 V.
5. Linearity error is the maximum deviation from the best straight line through the A/D transfer characteristics.
6. 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.
7. Total unadjusted error is the sum of linearity, zero-scale, and full-scale errors.
8. Both the input address and the output codes are expressed in positive logic. The A11 analog input signal is internally generated and
is used for test purposes.