Datasheet

ADC081C021, ADC081C027
SNAS447C –FEBRUARY 2008–REVISED MARCH 2013 www.ti.com
A.C. and Timing Characteristics
The following specifications apply for V
A
= +2.7V to +5.5V. Boldface limits apply for T
MIN
≤ T
A
≤ T
MAX
and all other limits are
at T
A
= 25°C, unless otherwise specified.
Units
Symbol Parameter Conditions
(1)
Typical
(2)
Limits
(1)(2)
(Limits)
CONVERSION RATE
Conversion Time 1 µs
f
SCL
= 100kHz 5.56 ksps
f
SCL
= 400kHz 22.2 ksps
f
CONV
Conversion Rate
f
SCL
= 1.7MHz 94.4 ksps
f
SCL
= 3.4MHz 188.9 ksps
DIGITAL TIMING SPECS (SCL, SDA)
Standard Mode 100 kHz (max)
Fast Mode 400 kHz (max)
f
SCL
Serial Clock Frequency
High Speed Mode, C
b
= 100pF 3.4 MHz (max)
High Speed Mode, C
b
= 400pF 1.7 MHz (max)
Standard Mode 4.7 us (min)
Fast Mode 1.3 us (min)
t
LOW
SCL Low Time
High Speed Mode, C
b
= 100pF 160 ns (min)
High Speed Mode, C
b
= 400pF 320 ns (min)
Standard Mode 4.0 us (min)
Fast Mode 0.6 us (min)
t
HIGH
SCL High Time
High Speed Mode, C
b
= 100pF 60 ns (min)
High Speed Mode, C
b
= 400pF 120 ns (min)
Standard Mode 250 ns (min)
t
SU;DAT
Data Setup Time Fast Mode 100 ns (min)
High Speed Mode 10 ns (min)
0 us (min)
Standard Mode
(3)
3.45 us (max)
0 us (min)
Fast Mode
(3)
0.9 us (max)
t
HD;DAT
Data Hold Time
0 ns (min)
High Speed Mode, C
b
= 100pF
70 ns (max)
0 ns (min)
High Speed Mode, C
b
= 400pF
150 ns (max)
Standard Mode 4.7 us (min)
Setup time for a start or a repeated
t
SU;STA
Fast Mode 0.6 us (min)
start condition
High Speed Mode 160 ns (min)
Standard Mode 4.0 us (min)
Hold time for a start or a repeated start
t
HD;STA
Fast Mode 0.6 us (min)
condition
High Speed Mode 160 ns (min)
Bus free time between a stop and start Standard Mode 4.7 us (min)
t
BUF
condition Fast Mode 1.3 us (min)
Standard Mode 4.0 us (min)
t
SU;STO
Setup time for a stop condition Fast Mode 0.6 us (min)
High Speed Mode 160 ns (min)
Standard Mode 1000 ns (max)
20+0.1C
b
ns (min)
Fast Mode
300 ns (max)
t
rDA
Rise time of SDA signal
10 ns (min)
High Speed Mode, C
b
= 100pF
80 ns (max)
20 ns (min)
High Speed Mode, C
b
= 400pF
160 ns (max)
(1) C
b
refers to the capacitance of one bus line. C
b
is expressed in pF units.
(2) Typical figures are at T
J
= 25°C, and represent most likely parametric norms. Test limits are specified to AOQL (Average Outgoing
Quality Level).
(3) The ADC081C021 will provide a minimum data hold time of 300ns to comply with the I
2
C Specification.
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