Datasheet

LTC2945
4
2945fa
For more information www.linear.com/LTC2945
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ADC
RES Resolution (No missing codes) (Note 5)
l
12 Bits
V
FS
Full-Scale Voltage ΔSENSE (Note 7)
V
IN
ADIN
l
l
l
101.7
101.7
2.033
102.4
102.4
2.048
103.1
103.1
2.063
mV
V
V
LSB LSB Step Size
ΔSENSE
V
IN
ADIN
25
25
0.5
µV
mV
mV
TUE Total Unadjusted Error (Note 6)
ΔSENSE
V
IN
ADIN
l
l
l
±0.75
±0.75
±0.75
%
%
%
V
OS
Offset Error ΔSENSE
V
IN
ADIN
l
l
l
±3.1
±1.5
±1.1
LSB
LSB
LSB
INL Integral Nonlinearity
ΔSENSE
V
IN
ADIN
l
l
l
±3
±2
±2
LSB
LSB
LSB
s
T
Transition Noise (Note 5) ΔSENSE
V
IN
ADIN
1.2
0.3
10
µV
RMS
mV
RMS
µV
RMS
f
CONV
Conversion Rate (Continuous Mode)
l
6 7.5 9 Hz
t
CONV
Conversion Time (Snapshot Mode) ΔSENSE
V
IN
, ADIN
l
l
60
30
66
33
72
36
ms
ms
R
ADIN
ADIN Pin Input Resistance V
DD
= 48V, ADIN = 3V
l
3 10 MΩ
I
ADIN
ADIN Pin Input Current V
DD
= 48V, ADIN = 3V
l
±1 µA
I
2
C INTERFACE (V
DD
= 48V)
V
ADR(H)
ADR0, ADR1 Input High Threshold
l
2.1 2.4 2.7 V
V
ADR(L)
ADR0, ADR1 Input Low Threshold
l
0.3 0.6 0.9 V
I
ADR(IN)
ADR0, ADR1 Input Current ADR0, ADR1 = 0V, 3V
l
±13 µA
I
ADR(IN,Z)
Allowable Leakage When Open
l
±7 µA
V
OD(OL)
SDAO, SDAO, ALERT Output Low Voltage I
SDAO
, I
SDAO
, I
ALERT
= 8mA
l
0.15 0.4 V
I
SDA,SCL(IN)
SDAI, SDAO, SDAO, SCL Input Current SDAI, SDAO, SDAO, SCL = 5V
l
0 ±1 µA
V
SDA,SCL(TH)
SDAI, SCL Input Threshold
l
1.5 1.9 2.2 V
V
SDA,SCL(CL)
SDAI, SCL Clamp Voltage I
SDAI
, I
SCL
= 3mA
l
5.9 6.4 6.9 V
I
ALERT(IN)
ALERT Input Current ALERT = 5V
l
0 ±1 µA
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
is from 4V to 80V unless otherwise noted. (Note 2)