Datasheet

LTC2495
5
2495fd
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
EOSC
External Oscillator Frequency Range (Note 16)
l
10 4000 kHz
t
HEO
External Oscillator High Period
l
0.125 100 µs
t
LEO
External Oscillator Low Period
l
0.125 100 µs
t
CONV_1
Conversion Time for 1x Speed Mode 50Hz Mode
60Hz Mode
Simultaneous 50Hz/60Hz Mode
External Oscillator (Note 10)
l
l
l
157.2
131
144.1
160.3
133.6
146.9
41036/f
EOSC
(in kHz)
163.5
136.3
149.9
ms
ms
ms
ms
t
CONV_2
Conversion Time for 2x Speed Mode 50Hz Mode
60Hz Mode
Simultaneous 50Hz/60Hz Mode
External Oscillator (Note 10)
l
l
l
78.7
65.6
72.2
80.3
66.9
73.6
20556/f
EOSC
(in kHz)
81.9
68.2
75.1
ms
ms
ms
ms
Digital inputs anD Digital outputs
The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
SCL
SCL Clock Frequency
l
0 400 kHz
t
HD(SDA)
Hold Time (Repeated) START Condition
l
0.6 µs
t
LOW
LOW Period of the SCL Pin
l
1.3 µs
t
HIGH
HIGH Period of the SCL Pin
l
0.6 µs
t
SU(STA)
Set-Up Time for a Repeated START Condition
l
0.6 µs
t
HD(DAT)
Data Hold Time
l
0 0.9 µs
t
SU(DAT)
Data Set-Up Time
l
100 ns
t
r
Rise Time for SDA Signals (Note 14)
l
20 + 0.1C
B
300 ns
t
f
Fall Time for SDA Signals (Note 14)
l
20 + 0.1C
B
300 ns
t
SU(STO)
Set-Up Time for STOP Condition
l
0.6 µs
t
BUF
Bus Free Time Between a Second START Condition
l
1.3 µs
i
2
c tiMing characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3, 15)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to GND.
Note 3: Unless otherwise specified: V
CC
= 2.7V to 5.5V
V
REFCM
= V
REF
/2, F
S
= 0.5V
REF
/Gain
V
IN
= IN
+
– IN
–
, V
IN(CM)
= (IN
+
– IN
–
)/2,
where IN
+
and IN
–
are the selected input channels.
Note 4: Use internal conversion clock or external conversion clock source
with f
EOSC
= 307.2kHz unless otherwise specified.
Note 5: Guaranteed by design, not subject to test.
Note 6: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 7: 50Hz mode (internal oscillator) or f
EOSC
= 256kHz ±2% (external oscillator).
Note 8: 60Hz mode (internal oscillator) or f
EOSC
= 307.2kHz ±2% (external oscillator).
Note 9: Simultaneous 50Hz/60Hz mode (internal oscillator) or f
EOSC
=
280kHz ±2% (external oscillator).
Note 10: The external oscillator is connected to the f
O
pin. The external
oscillator frequency, f
EOSC
, is expressed in kHz.
Note 11: The converter uses its internal oscillator.
Note 12: The output noise includes the contribution of the internal
calibration operations.
Note 13: Guaranteed by design and test correlation.
Note 14: C
B
= capacitance of one bus line in pF (10pF ≤ C
B
≤ 400pF).
Note 15: All values refer to V
IH(MIN)
and V
IL(MAX)
levels.
Note 16: Refer to Applications Information section for Performance vs
Data Rate graphs.