Datasheet

LT1999-10/LT1999-20/
LT1999-50
4
1999fb
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, 0°C < T
A
< 70°C for C-grade parts, –40°C < T
A
< 85°C for I-grade parts, and –40°C < T
A
< 125°C for H-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
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
= 3.0V
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
1
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
1.25
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
t
r
Common Mode Step Recovery Time
ΔV
CM
= ±50V, 20ns
(Note 10)
LT1999-10
LT1999-20
LT1999-50
0.8
1
1.3
μs
μs
μs
V
S
Supply Voltage (Note 11)
l
4.5 5 5.5 V
I
S
Supply Current V
CM
> 5.5V
V
CM
= –5V
V
+
= 5.5V, V
SHDN
= 0.5V, V
CM
> 0V
l
l
l
1.55
5.8
3
1.9
7.1
10
mA
mA
μA
R
O
Output Impedance ΔI
O
= ±2mA 0.15 Ω
I
SRC
Sourcing Output Current R
LOAD
= 50Ω to GND
l
6 31 40 mA
I
SNK
Sinking Output Current R
LOAD
= 50Ω to V
+
l
15 26 40 mA
V
OUT
Swing Output High (with Respect to V
+
) R
LOAD
= 1kΩ to Mid-Supply
R
LOAD
= Open
l
l
125
5
250
125
mV
mV
Swing Output Low (with Respect to V
–
) R
LOAD
= 1kΩ to Mid-Supply
R
LOAD
= Open
l
l
250
150
400
225
mV
mV
t
ON
Turn-On Time V
SHDN
= 0V to 5V 1 μs
t
OFF
Turn-Off Time V
SHDN
= 5V to 0V 1 μs