LT2078IS8 Linear Technology, LT2078IS8 Datasheet - Page 11

• Manufacturer Part Number: LT2078IS8
• Description: IC OPAMP MICROPOWER DUAL 8-SOIC
• Manufacturer: Linear Technology

Specifications of LT2078IS8

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Slew Rate: 0.1 V/µs
• Gain Bandwidth Product: 200kHz
• Current - Input Bias: 6nA
• Voltage - Input Offset: 70µV
• Current - Supply: 47µA
• Voltage - Supply, Single/dual (±): 2.2 V ~ 36 V, ±1.1 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• Current - Output / Channel: -
• -3db Bandwidth: -

APPLICATIONS
1. When the input is more than a diode drop below ground,
2. When the input is more than 400mV below ground (at
Distortion
There are two main contributors of distortion in op amps:
distortion caused by nonlinear common mode rejection
and output crossover distortion as the output transitions
from sourcing to sinking current. The common mode
Table 1
PARAMETER
V
Temperature Coefficient V
Average Noninverting I
Match of Noninverting I
CMRR Match
PSRR Match
OS
4V
2V
0V
unlimited current will flow from the substrate (V
terminal) to the input. This can destroy the unit. On the
LT2078/LT2079, resistors in series with the input protect
the devices even when the input is 5V below ground.
25 C), the input stage saturates and phase reversal
occurs at the output. This can cause lockup in servo
systems. Due to a unique phase reversal protection cir-
cuitry, the LT2078/LT2079 output does not reverse, as
illustrated in Figure 2, even when the inputs are at –1V.
Match, V
6V
–1V TO 5V
P-P
INPUT
OS
Figure 2. Voltage Follower with Input Exceeding the Negative Common Mode Range (V
B
B
1ms/DIV
U
LT2078
LT2079
OS
INFORMATION
U
LT2078AC/LT2079AC/LT2078AI/LT2079AI
LT2078/79 • F01a
50% YIELD
0.12
120
117
0.5
W
30
40
6
4V
2V
0V
OP-90 EXHIBITS OUTPUT PHASE REVERSAL
U
98% YIELD
110
150
100
105
1.2
0.4
8
–
1ms/DIV
rejection of the LT2078/LT2079 is very good, typically
108dB. Therefore, as long as the input operates in the
normal common mode range, there will be very little
common mode induced distortion. If the op amp is oper-
ating inverting there is no common mode induced distor-
tion. Crossover distortion will increase as the output load
resistance decreases. For the lowest distortion the LT2078/
LT2079 should be operated with the output always sourc-
ing current, this is usually accomplished by putting a
resistor from the output to V
tion with no load, the output will source and sink current
through the feedback resistor. High value feedback resis-
tors will reduce crossover distortion and maintain
micropower operation.
Matching Specifications
In many applications the performance of a system de-
pends on the matching between two op amps, rather than
LT2078C/LT2079C/LT2078I/LT2079I
50% YIELD
LT2078/79 • F01b
0.15
117
117
0.6
50
50
6
4V
2V
0V
LT2078/LT2079 NO PHASE REVERSAL
98% YIELD
LT 2078/LT 2079
–
. In an inverting configura-
190
250
102
1.8
0.5
10
97
S
= 5V, 0V)
1ms/DIV
11
LT2078/79 • F01C
20789fa
UNITS
V/ C
nA
nA
dB
dB
V
V