Datasheet

LT1999-10/LT1999-20/
LT1999-50
5
1999fb
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, –55°C < T
A
< 150°C for MP-grade parts, otherwise specifications are at T
A
= 25°C. V
+
= 5V, GND = 0V, V
CM
= 12V,
V
REF
= floating, V
SHDN
= floating, unless otherwise specified. See Figure 2.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
SENSE
Full-Scale Input Sense Voltage (Note 7)
V
SENSE
= V
+IN
– V
–IN
LT1999-10
LT1999-20
LT1999-50
l
l
l
–0.35
–0.2
–0.08
0.35
0.2
0.08
V
V
V
V
CM
CM Input Voltage Range
l
–5 80 V
R
IN(DIFF)
Differential Input Impedance ΔV
INDIFF
= ±2V/GAIN
l
6.4 8 9.6 kΩ
R
INCM
CM Input Impedance ΔV
CM
= 5.5V to 80V
ΔV
CM
= –5V to 4.5V
l
l
5
3.6
20
4.8 6
MΩ
kΩ
V
OSI
Input Referred Voltage Offset
l
–750
–2000
±500 750
2000
μV
μV
ΔV
OSI
/ΔT Input Referred Voltage Offset Drift 8 μV/°C
A
V
Gain LT1999-10
LT1999-20
LT1999-50
l
l
l
9.95
19.9
48.75
10
20
50
10.05
20.1
50.25
V/V
V/V
V/V
A
V
Error Gain Error ΔV
OUT
= ±2V
l
–0.5 ±0.2 0.5 %
I
B
Input Bias Current
I(+IN) = I(–IN)
(Note 8)
V
CM
> 5.5V
V
CM
= –5V
V
SHDN
= 0.5V, 0V < V
CM
< 80V
l
l
l
100
–2.35
137.5
–1.95
0.001
180
–1.5
10
μA
mA
μA
I
OS
Input Offset Current
I
OS
= I(+IN) – I(–IN)
(Note 8)
V
CM
> 5.5V
V
CM
= –5V
V
SHDN
= 0.5V, 0V < V
CM
< 80V
l
l
l
–1
–10
–10
1
10
10
μA
μA
μA
PSRR Supply Rejection Ratio V
+
= 4.5V to 5.5V
l
68 77 dB
CMRR Sense Input Common Mode Rejection V
CM
= –5V to 80V
V
CM
= –5V to 5.5V
V
CM
= 12V, 7V
P-P
, f = 100kHz,
V
CM
= 0V, 7V
P-P
, f = 100kHz
l
l
l
l
96
96
75
80
105
120
90
100
dB
dB
dB
dB
e
n
Differential Input Referred Noise Voltage Density f= 10kHz
f = 0.1Hz to 10Hz
97
8
nV/√Hz
μV
P-P
REF
RR
REF Pin Rejection, V
+
= 5.5V
ΔV
REF
= 2.75V
ΔV
REF
= 3.25V
ΔV
REF
= 3.25V
LT1999-10
LT1999-20
LT1999-50
l
l
l
62
62
62
70
70
70
dB
dB
dB
R
REF
REF Pin Input Impedance
V
SHDN
= 0.5V
l
l
60
0.15
80
0.4
100
0.65
kΩ
MΩ
V
REF
Open Circuit Voltage
V
SHDN
= 0.5V
l
l
2.45
0.25
2.5
2.5
2.55
2.75
V
V
V
REFR
REF Pin Input Range (Note 9) LT1999-10
LT1999-20
LT1999-50
l
l
l
1.5
1.125
1.125
V
+
– 1.25
V
+
– 1.125
V
+
– 1.125
V
V
V
I
SHDN
Pin Pull-Up Current V
+
= 5.5V, V
SHDN
= 0V
l
–6 –2 μA
V
IH
SHDN Pin Input High
l
V
+
– 0.5 V
V
IL
SHDN Pin Input Low
l
0.5 V
f
3dB
Small Signal Bandwidth LT1999-10
LT1999-20
LT1999-50
2
2
1.2
MHz
MHz
MHz
SR Slew Rate 3 V/μs
t
S
Settling Time Due to Input Step, ΔV
OUT
= ±2V 0.5% Settling 2.5 μs