Datasheet

LT2178/LT2179
3
21789fc
ELECTRICAL CHARACTERISTICS
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25°C, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS
LT2178AC/LT2178AI
LT2179AC
LT2178C/LT2178I
LT2179C/LT2179I
UNITSMIN TYP MAX MIN TYP MAX
V
OS
Input Offset Voltage LT2178
LT2179
30
35
70
100
40
40
120
150
V
V
ΔV
OS
ΔTime
Long Term Input Offset
Voltage Stability
0.5 0.6 V/Mo
I
OS
Input Offset Current 0.05 0.25 0.05 0.35 nA
I
B
Input Bias Current 3 5 3 6 nA
e
n
Input Noise Voltage 0.1Hz to 10Hz (Note 2) 0.9 2.0 0.9 µV
P-P
Input Noise Voltage Density f
O
= 10Hz (Note 2)
f
O
= 1000Hz (Note 2)
50
49
75
65
50
49
nV√Hz
nV√Hz
i
n
Input Noise Current 0.1Hz to 10Hz (Note 2) 1.5 2.5 1.5 pA
P-P
Input Noise Current Density f
O
= 10Hz (Note 2)
f
O
= 1000Hz
0.03
0.01
0.07 0.03
0.01
pA√Hz
pA√Hz
Input Resistance
Differential Mode
Common Mode
(Note 3)
0.8 2
12
0.6 2
12
G
G
Input Voltage Range 3.5
0
3.9
–0.3
3.5
0
3.9
–0.3
V
V
CMRR Common Mode Rejection Ratio V
CM
= 0V to 3.5V 93 103 90 102 dB
PSRR Power Supply Rejection Ratio V
S
= 2.2V to 12V 94 104 92 104 dB
A
VOL
Large-Signal Voltage Gain V
O
= 0.03V to 4V, No Load (Note 3)
V
O
= 0.03V to 3.5V, R
L
= 50k
140
80
700
200
110
70
700
200
V/mV
V/mV
Maximum Output Voltage Swing Output Low, No Load
Output Low, 2k to GND
Output Low, I
SINK
= 100µA
6.5
0.2
120
9
0.6
160
6.5
0.2
120
9
0.6
160
mV
mV
mV
Output High, No Load
Output High, 2k to GND
4.2
3.5
4.4
3.8
4.2
3.5
4.4
3.8
V
V
SR Slew Rate A
V
= 1, C
L
= 10pF (Note 3) 0.013 0.025 0.013 0.025 V/µs
GBW Gain Bandwidth Product f
O
≤ 5kHz 60 60 kHz
I
S
Supply Current per Amplifi er
V
S
= ±1.5V, V
O
= 0V
13
12
18
17
14
13
21
20
µA
µA
Channel Separation
ΔV
IN
= 3V, RL = 10k
110 110 dB
Minimum Supply Voltage (Note 4) 2 2.2 2 2.2 V
SYMBOL PARAMETER CONDITIONS
LT2178AI LT2178I/LT2179I
UNITSMIN TYP MAX MIN TYP MAX
V
OS
Input Offset Voltage LT2178
LT2179
l
l
70
80
270
300
95
100
370
400
V
V
ΔV
OS
ΔT
Input Offset Voltage Drift LT2178 (Note 5)
LT2179
l
0.4
0.5
1.8
3
0.5
0.6
2.3
3.5
µV/ºC
µV/ºC
I
OS
Input Offset Current
l
0.07 0.70 0.1 1 nA
I
B
Input Bias Current
l
37 48 nA
CMRR Common Mode Rejection Ratio V
CM
= 0.05V to 3.2V
l
86 100 84 98 dB
PSRR Power Supply Rejection Ratio V
S
= 3V to 12V
l
88 100 86 100 dB
The l denotes the specifi cations which apply over the full operating temperature range. V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V,
–40°C ≤ T
A
≤ 85°C for I-grades, unless otherwise noted. (Note 6)