Datasheet
SLAS072E − DECEMBER 1992 − REVISED JANUARY 2004
7
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converter and analog input (continued)
S
C
Threshold
Detector
Node 512
REF−
REF+
S
T
512
V
I
To Output
Latches
REF−
S
T
REF+
REF−
S
T
REF+
REF−
S
T
REF+
REF−
S
T
REF+
REF−
S
T
REF+
REF−
S
T
REF+
REF−
S
T
REF−
S
T
1124816128256
Figure 1. Simplified Model of the Successive-Approximation System
chip-select operation
The trailing edge of CS
starts all modes of operation, and CS can abort a conversion sequence in any mode.
A high-to-low transition on CS
within the specified time during an ongoing cycle aborts the cycle, and the device
returns to the initial state (the contents of the output data register remain at the previous conversion result).
Exercise care to prevent CS
from being taken low close to completion of conversion because the output data
can be corrupted.
reference voltage inputs
There are two reference inputs used with these devices: REF+ and REF−. These voltage values establish the
upper and lower limits of the analog input to produce a full-scale and zero-scale reading respectively. The values
of REF+, REF−, and the analog input should not exceed the positive supply or be lower than GND consistent
with the specified absolute maximum ratings. The digital output is at full scale when the input signal is equal
to or higher than REF+ and at zero when the input signal is equal to or lower than REF−.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
(see Note 1): TLV1543C/TLV1543I −0.5 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . .
TLV1543M −0.5 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(any input) −0.3 V to V
CC
+ 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
−0.3 V to V
CC
+ 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positive reference voltage, V
ref+
V
CC
+ 0.1 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Negative reference voltage, V
ref−
−0.1 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak input current (any input), I
(p-p)
±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak total input current (all inputs), I
p
±30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: TLV1543C 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TLV1543I −40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TLV1543M −55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
−65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from the case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to digital ground with REF− and GND wired together (unless otherwise noted).