TLC0838INE4 Datasheet, PDF (8/19 Pages) Texas Instruments – 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL

TLC0834C, TLC0834I, TLC0838C, TLC0838I
8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL
SLAS094E – MARCH 1995 – REVISED OCTOBER 2000
electrical characteristics over recommended range of operating free-air temperature, V_CC = 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
VCC+ 0.05
On channel
VI = 5 V
1
II(stdby) Standby input current (see Note 4)
Off channel
On channel
VI = 0
VI = 0
–1
µA
–1
Off channel
VI = 5 V
1
ri(REF) Input resistance to REF
1.3
2.4
5.9 kΩ
† _{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
ICC Supply current
‡ _{All typical values are at VCC = 5 V, TA = 25°C.}
MIN TYP‡ MAX UNIT
0.6 1.25 mA
operating characteristics, V_CC = 5 V, f_(clock) = 250 kHz, t_r = t_f = 20 ns, T_A = 25°C (unless otherwise
noted)
PARAMETER
TEST CONDITIONS§
MIN TYP MAX UNIT
Supply-voltage variation error
Total unadjusted error (see Note 5)
Common-mode error
VCC = 4.75 V to 5.25 V
Vref = 5 V, TA = MIN to MAX
Differential mode
± 1/16 ± 1/4 LSB
± 1 LSB
± 1/16 ± 1/4 LSB
tpd
Propagation delay time, output
data after CLK↓ (see Note 6 and Figure 2)
MSB-first data
LSB-first data ^{CL = 100 pF}
1500
ns
600
tdis
Output disable time, DO or SARS after CS↑ (see Figure 3)
CL = 10 pF, RL = 10 kΩ
CL = 100 pF, RL = 2 kΩ
tc
Conversion time (multiplexer-addressing time not included)
250
ns
500
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.
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