LT1991
ELECTRICAL CHARACTERISTICS
VCM = VREF = half supply, unless otherwise noted.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Difference amplifier configuration, VS = 5V, 0V or ±15V;
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Output Voltage Swing (to Either Rail)
No Load
OUT
V = 5V, 0V
40
55
65
110
mV
mV
mV
S
V = 5V, 0V
●
●
S
V = ±15V
S
1mA Load
V = 5V, 0V
150
225
275
300
mV
mV
mV
S
V = 5V, 0V
●
●
S
V = ±15V
S
I
Output Short-Circuit Current (Sourcing)
Output Short-Circuit Current (Sinking)
–3dB Bandwidth
Drive Output Positive;
Short Output to Ground
8
4
12
21
mA
mA
SC
●
●
Drive Output Negative;
8
4
mA
mA
Short Output to V or Midsupply
S
BW
G = 1
G = 3
G = 9
110
78
40
kHz
kHz
kHz
GBWP
Op Amp Gain Bandwidth Product
Rise Time, Fall Time
f = 10kHz
560
kHz
t , t
G = 1; 0.1V Step; 10% to 90%
G = 9; 0.1V Step; 10% to 90%
3
8
µs
µs
r
f
t
Settling Time to 0.01%
G = 1; V = 5V, 0V; 2V Step
42
48
114
74
µs
µs
µs
µs
s
S
G = 1; V = 5V, 0V; –2V Step
S
G = 1; V = ±15V, 10V Step
S
G = 1; V = ±15V, –10V Step
S
SR
Slew Rate
V = 5V, 0V; V
= 1V to 4V
OUT
= ±10V
●
●
0.06
0.08
0.12
0.12
V/µs
V/µs
S
V = ±15V; V
S
OUT
I
Supply Current
V = 5V, 0V
100
110
150
µA
µA
S
S
●
●
V = ±15V
S
130
160
210
µA
µA
Note 1: Absolute Maximum Ratings are those beyond which the life of the
Note 6: This parameter is not 100% tested.
device may be impaired.
Note 7: Input voltage range is guaranteed by the CMRR test at V = ±15V.
S
Note 2: The P3/M3 and P9/M9 inputs should not be taken more than 0.2V
beyond the supply rails. The P1/M1 inputs can withstand ±60V if P9/M9
For the other voltages, this parameter is guaranteed by design and through
correlation with the ±15V test. See the Applications Information section to
determine the valid input voltage range under various operating
conditions.
are grounded and V = ±15V (see Applications Information section about
S
“High Voltage CM Difference Amplifiers”).
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum ratings.
Note 8: Offset voltage, offset voltage drift and PSRR are defined as
referred to the internal op amp. You can calculate output offset as follows.
In the case of balanced source resistance, V
= V • NOISEGAIN +
Note 4: Both the LT1991C and LT1991I are guaranteed functional over the
–40°C to 85°C temperature range.
Note 5: The LT1991C is guaranteed to meet the specified performance
from 0°C to 70°C and is designed, characterized and expected to meet
specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT1991I is guaranteed to meet
specified performance from –40°C to 85°C.
OS,OUT
OS
I
• 450k + I • 450k • (1– R /R ) where R and R are the total
OS
B P N P N
resistance at the op amp positive and negative terminal respectively.
Note 9: Applies to resistors that are connected to the inverting inputs.
Resistor matching is not tested directly, but is guaranteed by the gain
error test.
Note 10: Input impedence is tested by a combination of direct
measurements and correlation to the CMRR and gain error tests.
1991fb
4
Linear Systems [ Linear Systems ]
