FEATURES
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LT1789-1/LT1789-10
Micropower,
Single Supply Rail-to-Rail
Output Instrumentation Amplifiers
DESCRIPTION
The LT
®
1789-1/LT1789-10 are micropower, precision
instrumentation amplifiers that are optimized for single
supply operation from 2.2V to 36V. The quiescent current
is 95μA max, the inputs common mode to ground and the
output swings within 110mV of ground. The gain is set
with a single external resistor for a gain range of 1 to 1000
for the LT1789-1 and 10 to 1000 for the LT1789-10.
The high accuracy of the LT1789-1 (40ppm maximum non-
linearity and 0.25% max gain error) is unmatched by other
micropower instrumentation amplifiers. The LT1789-10
maximizes both the input common mode range and dynamic
output range when an amplification of 10 or greater is required,
allowing precise signal processing where other instrumenta-
tion amplifiers fail to operate. The LT1789-1/LT1789-10 are
laser trimmed for very low input offset voltage, low input
offset voltage drift, high CMRR and high PSRR. The output
can handle capacitive loads up to 400pF (LT1789-1), 1000pF
(LT1789-10) in any gain configuration while the inputs are
ESD protected up to 10kV (human body).
The LT1789-1/LT1789-10 are offered in the 8-pin SO
package, requiring significantly less PC board area than
discrete multi op amp and resistor designs.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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Micropower: 95μA Supply Current Max
Low Input Offset Voltage: 100μV Max
Low Input Offset Voltage Drift: 0.5μV/°C Max
Single Gain Set Resistor:
G = 1 to 1000 (LT1789-1)
G = 10 to 1000 (LT1789-10)
Inputs Common Mode to V
–
Wide Supply Range: 2.2V to 36V Total Supply
CMRR at G = 10: 96dB Min
Gain Error: G = 10, 0.25% Max
Gain Nonlinearity: G = 10, 40ppm Max
Input Bias Current: 40nA Max
PSRR at G = 10: 100dB Min
1kHz Voltage Noise: 48nV/√Hz
0.1Hz to 10Hz Noise: 1.5μV
P-P
APPLICATIONS
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Portable Instrumentation
Bridge Amplifiers
Strain Gauge Amplifiers
Thermocouple Amplifiers
Differential to Single-Ended Converters
Medical Instrumentation
TYPICAL APPLICATION
0.5A to 4A Voltage Controlled Current Source
C1
4700pF
V
S
V
IN
R2
10k
V
S
= 3.3V TO 32V
V
IN
I
LOAD
=
R
SENSE
• 10
= 1A PER VOLT AS SHOWN
RISE TIME ≈ 250μs, 10% TO 90%,
1A TO 2A OUTPUT STEP INTO 0.25Ω LOAD
+
3
–
4
R1
90.9k
V
S
2
7
LT1636
5
6
C3
0.1μF
R3
100Ω
V
S
7
R4
10k
6
REF
1
5
4
8k
120Ω
TIP127*
+
3
8
3
1
2
4
* ENSURE ADEQUATE POWER
DISSIPATION CAPABILITY AT
HIGHER VOLTAGES,
CURRENTS AND DUTY CYCLES
R
SENSE
*
0.1Ω I
LOAD
LT1789-1
C2
3300pF
–
2
R
LOAD
*
1789 TA01
1789fc
1
LT1789-1/LT1789-10
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
R
G
1
–IN 2
+IN 3
–V
S
4
8 R
G
7 +V
S
6 OUT
5 REF
Supply Voltage (V
+
to V
–
)..........................................36V
Input Differential Voltage ..........................................36V
Input Current (Note 3) ......................................... ±20mA
Output Short-Circuit Duration .......................... Indefinite
Operating Temperature Range .................–40°C to 85°C
Specified Temperature Range (Note 4)
LT1789C-1, LT1789C-10 .......................–40°C to 85°C
LT1789I-1, LT1789I-10 ........................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1789CS8-1#PBF
LT1789IS8-1#PBF
LT1789CS8-10#PBF
LT1789IS8-10#PBF
LEAD BASED FINISH
LT1789CS8-1
LT1789IS8-1
LT1789CS8-10
LT1789IS8-10
TAPE AND REEL
LT1789CS8-1#TRPBF
LT1789IS8-1#TRPBF
LT1789CS8-10#TRPBF
LT1789IS8-10#TRPBF
TAPE AND REEL
LT1789CS8-1#TR
LT1789IS8-1#TR
LT1789CS8-10#TR
LT1789IS8-10#TR
PART MARKING
17891
1789I1
178910
789I10
PART MARKING
17891
1789I1
178910
789I10
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
supply, T
A
= 25°C, unless otherwise noted.
SYMBOL PARAMETER
G
Gain Range
Gain Error (Note 6)
3V AND 5V ELECTRICAL CHARACTERISTICS
CONDITIONS
LT1789-1, G = 1 + (200k/R
G
)
LT1789-10, G = 10 • [1+ (200k/R
G
)]
G = 1, V
O
= 0.1V to (+V
S
) – 1V
LT1789-1, V
O
= 0.1V to (+V
S
) – 0.3V
LT1789-10, V
O
= 0.2V to (+V
S
) – 0.3V
G = 10 (Note 2)
G = 100 (Note 2)
G = 1000 (Note 2)
G = 1, V
O
= 0.1V to (+V
S
) – 1V
LT1789-1, V
O
= 0.1V to (+V
S
) – 0.3V
LT1789-10, V
O
= 0.2V to 4.7V, V
S
= 5V
(Note 8)
G = 10
G = 100
G = 1000
MIN
1
V
S
= 3V, 0V; V
S
= 5V, 0V; R
L
= 20k, V
CM
= V
REF
= half
LT1789-1
TYP
MAX
1000
10
0.02
0.20
1000
%
MIN
LT1789-10
TYP
MAX
UNITS
Gain Nonlinearity (Note 6)
0.06
0.06
0.13
35
0.25
0.27
100
0.01
0.09
0.16
0.25
0.30
%
%
%
ppm
12
18
90
40
75
15
20
100
100
100
ppm
ppm
ppm
1789fc
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LT1789-1/LT1789-10
supply, T
A
= 25°C, unless otherwise noted.
SYMBOL PARAMETER
V
OST
V
OSI
V
OSO
I
OS
I
B
e
n
Input Offset Voltage
Output Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage,
RTI (Referred to Input)
3V AND 5V ELECTRICAL CHARACTERISTICS
CONDITIONS
G = 1000
G = 1 (LT1789-1), G =10 (LT1789-10)
(Note 6)
(Note 6)
G = 1, f
O
= 0.1Hz to 10Hz
G = 10
G = 100, 1000
f
O
= 1kHz (Note 7)
f
O
= 0.1Hz to 10Hz
f
O
= 1kHz
V
IN
= 0V to (+V
S
) – 1V (Note 6)
Differential
Common Mode
0
1k Source Imbalance (Note 6)
LT1789-1,V
CM
= 0V to (+V
S
) – 1V
LT1789-10, V
CM
= 0V to (+V
S
) – 1.2V
G=1
G = 10
G = 100
G = 1000
V
S
= 2.5V to 12.5V, V
CM
= V
REF
= 1V
G=1
G = 10
G = 100
G = 1000
(Note 7)
(Note 7)
(Note 7)
Short to GND
Short to +V
S
G=1
G = 10
G = 100
G = 1000
G = 10, V
OUT
= 0.5V to 4.5V
4V Step
V
REF
= 0V
0.75
MIN
Total Input Referred Offset Voltage V
OST
= V
OSI
+ V
OSO
/G
V
S
= 3V, 0V; V
S
= 5V, 0V; R
L
= 20k, V
CM
= V
REF
= half
LT1789-1
TYP
15
150
0.2
19
5.0
1.5
1.0
48
330
16
62
1.6
1.6
1.6
+V
S
– 1
0
0.75
85
MAX
100
750
4
40
MIN
LT1789-10
TYP
20
650
0.2
19
4.6
1.1
52
270
16
62
1.6
1.6
1.6
+V
S
– 1.2
90
MAX
160
3000
4
40
UNITS
μV
μV
nA
nA
μV
P-P
μV
P-P
μV
P-P
nV/√Hz
nV/√Hz
pA
P-P
fA/√Hz
GΩ
pF
pF
V
Total RTI Noise = √e
ni2
+ (e
no
/G)
2
e
ni
e
no
i
n
R
IN
C
IN
V
CM
CMRR
Input Noise Voltage Density, RTI
Input Noise Current
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Output Noise Voltage Density, RTI f
O
= 1kHz (Note 3)
79
96
100
100
90
100
102
102
88
106
114
114
100
113
116
116
2.2
67
54
2.5
95
100
88
98
98
105
113
113
dB
dB
dB
dB
dB
dB
dB
dB
2.5
95
110
V
μA
mV
V
mA
mA
kHz
kHz
kHz
kHz
V/μs
μs
kΩ
μA
PSRR
Power Supply Rejection Ratio
94
102
102
109
120
120
2.2
67
62
Minimum Supply Voltage
I
S
V
OL
V
OH
I
SC
BW
Supply Current
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current
Bandwidth
+V
S
– 0.3 +V
S
– 0.19
2.2
8.5
60
30
3
0.2
0.023
240
220
2.7
1 ±0.0001
+V
S
– 0.3 +V
S
– 0.19
2.2
8.5
25
12
1.5
0.062
190
220
2.7
1 ±0.0001
SR
R
REFIN
I
REFIN
AV
REF
Slew Rate
Settling Time to 0.01%
Reference Input Resistance
Reference Input Current
Reference Gain to Output
1789fc
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LT1789-1/LT1789-10
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Gain Error (Note 6)
CONDITIONS
G = 1, V
O
= 0.3V to (+V
S
) – 1V
V
O
= 0.3V to (+V
S
) – 0.5V
G = 10 (Note 2)
G = 100 (Note 2)
Gain Nonlinearity (Note 6)
G = 1, V
O
= 0.3V to (+V
S
) – 1V
l
l
l
l
The
l
denotes the specifications which apply over the temperature range of
0°C ≤ T
A
≤ 70°C. V
S
= 3V, 0V; V
S
= 5V, 0V; R
L
= 20k, V
REF
= half supply, unless otherwise noted. (Note 4)
LT1789-1
MIN
TYP
MAX
0.25
0.53
0.55
185
0.30
0.53
MIN
LT1789-10
TYP
MAX
UNITS
%
%
%
ppm
LT1789-1, V
O
= 0.3V to (+V
S
) – 0.5V
LT1789-10, V
O
= 0.3V to 4.7V, V
S
= 5V
(Note 8)
l
G = 10
l
G = 100
G/T
V
OST
V
OSI
V
OSIH
V
OSO
V
OSOH
V
OSI
/T
V
OSO
/T
I
OS
I
OS
/T
I
B
I
B
/T
V
CM
CMRR
Gain vs Temperature
Input Offset Voltage
Input Offset Voltage Hysteresis
Output Offset Voltage
Output Offset Voltage Hysteresis
Input Offset Voltage Drift (RTI)
Output Offset Voltage Drift
Input Offset Current
Input Offset Current Drift
Input Bias Current
Input Bias Current Drift
Input Voltage Range
Common Mode Rejection Ratio
(Note 6)
G < 1000 (Notes 2, 3)
G = 1000
(Notes 3, 5)
G = 1 (LT1789-1), G = 10 (LT1789-10)
(Notes 3, 5)
(Note 3)
(Note 3)
(Note 6)
l
90
120
5
50
150
3
50
0.2
1.5
3
45
50
0.2
(+V
S
) – 1
0.2
50
10
950
100
0.5
4
4.5
3
300
0.3
7
3
5
130
130
50
190
10
3700
900
0.7
20
4.5
45
(+V
S
) – 1.5
ppm
ppm
ppm/°C
µV
µV
µV
µV
µV/°C
µV/°C
nA
pA/°C
nA
pA/°C
V
Total Input Referred Offset Voltage V
OST
= V
OSI
+ V
OSO
/G
l
l
l
l
l
l
l
l
l
l
l
1k Source Imbalance (Note 6)
LT1789-1, V
CM
= 0.2V to (+V
S
) – 1V
LT1789-10, V
CM
= 0.2V to (+V
S
) – 1.5V
l
G=1
l
G = 10
l
G = 100, 1000
V
S
= 2.5V to 12.5V, V
CM
= V
REF
= 1V
G=1
G = 10
G = 100, 1000
(Note 7)
(Note 7)
(Note 7)
l
l
l
l
l
l
77
94
98
88
98
100
2.5
115
110
85
96
dB
dB
dB
dB
dB
dB
2.5
115
120
V
µA
mV
V
PSRR
Power Supply Rejection Ratio
92
100
Minimum Supply Voltage
I
S
V
OL
V
OH
Supply Current
Output Voltage Swing LOW
Output Voltage Swing HIGH
l
+V
S
– 0.38
+V
S
– 0.38
1789fc
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LT1789-1/LT1789-10
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Gain Error (Note 6)
CONDITIONS
G = 1, V
O
= 0.3V to (+V
S
) – 1V
V
O
= 0.3V to (+V
S
) – 0.5V
G = 10 (Note 2)
G = 100 (Note 2)
Gain Nonlinearity (Note 6)
G = 1, V
O
= 0.3V to (+V
S
) – 1V
l
l
l
l
The
l
denotes the specifications which apply over the temperature range of
–40°C ≤ T
A
≤ 85°C. V
S
= 3V, 0V; V
S
= 5V, 0V; R
L
= 20k, V
REF
= half supply, unless otherwise noted. (Note 4)
LT1789-1
MIN
TYP
MAX
0.30
0.57
0.59
250
0.35
0.62
MIN
LT1789-10
TYP
MAX
UNITS
%
%
%
ppm
LT1789-1, V
O
= 0.3V to (+V
S
) – 0.5V
LT1789-10, V
O
= 0.3V to 4.7V, V
S
= 5V
(Note 8)
l
G = 10
l
G = 100
G/T
V
OST
V
OSI
V
OSIH
V
OSO
V
OSOH
V
OSI
/T
V
OSO
/T
I
OS
I
OS
/T
I
B
I
B
/T
V
CM
CMRR
Gain vs Temperature
Input Offset Voltage
Input Offset Voltage Hysteresis
Output Offset Voltage
Output Offset Voltage Hysteresis
Input Offset Voltage Drift (RTI)
Output Offset Voltage Drift
Input Offset Current
Input Offset Current Drift
Input Bias Current
Input Bias Current Drift
Input Voltage Range
Common Mode Rejection Ratio
(Note 6)
G < 1000 (Notes 2, 3)
G = 1000
(Notes 3, 5)
G = 1 (LT1789-1), G = 10 (LT1789-10)
(Notes 3, 5)
(Note 3)
(Note 3)
(Note 6)
l
105
160
5
50
175
3
50
0.2
1.5
3
50
50
0.2
+V
S
– 1
0.2
50
10
1050
100
0.5
4
5
3
300
0.3
7
3
5
150
170
50
205
10
4000
900
0.7
20
5
50
+V
S
– 1.5
ppm
ppm
ppm/°C
µV
µV
µV
µV
µV/°C
µV/°C
nA
pA/°C
nA
pA/°C
V
Total Input Referred Offset Voltage V
OST
= V
OSI
+ V
OSO
/G
l
l
l
l
l
l
l
l
l
l
l
1k Source Imbalance (Note 6)
LT1789-1, V
CM
= 0.2V to (+V
S
) – 1V
LT1789-10, V
CM
= 0.2V to (+V
S
) – 1.5V
l
G=1
l
G = 10
l
G = 100, 1000
V
S
= 2.5V to 12.5V, V
CM
= V
REF
= 1V
G=1
G = 10
G = 100, 1000
(Note 7)
(Note 7)
(Note 7)
l
l
l
l
l
l
75
92
96
86
96
98
2.5
125
120
84
94
dB
dB
dB
dB
dB
dB
2.5
125
130
V
µA
mV
V
PSRR
Power Supply Rejection Ratio
90
98
Minimum Supply Voltage
I
S
V
OL
V
OH
Supply Current
Output Voltage Swing LOW
Output Voltage Swing HIGH
l
+V
S
– 0.40
+V
S
– 0.40
1789fc
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