LT1789-1/LT1789-10
Micropower,
Single Supply Rail-to-Rail
Output Instrumentation Amplifiers
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
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
APPLICATIO S
s
s
s
s
s
s
Portable Instrumentation
Bridge Amplifiers
Strain Gauge Amplifiers
Thermocouple Amplifiers
Differential to Single-Ended Converters
Medical Instrumentation
The LT
®
1789-1/LT1789-10 are micropower, precision in-
strumentation 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
nonlinearity 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
instrumentation 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 pack-
age, requiring significantly less PC board area than discrete
multi op amp and resistor designs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
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
–
R1
90.9k
V
S
2
7
LT1636
5
4
R4
10k
C2
3300pF
6
C3
0.1µF
R3
100Ω
V
S
7
6
REF
1
5
4
8k
120Ω
TIP127*
+
3
8
3
1
2
4
LT1789-1
–
2
U
* ENSURE ADEQUATE POWER
DISSIPATION CAPABILITY AT
HIGHER VOLTAGES,
CURRENTS AND DUTY CYCLES
R
SENSE
*
0.1Ω I
LOAD
R
LOAD
*
1789 TA01
U
U
1789f
1
LT1789-1/LT1789-10
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
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
ORDER PART
NUMBER
LT1789CS8-1
LT1789IS8-1
LT1789CS8-10
LT1789IS8-10
S8 PART MARKING
17891
1789I1
178910
789I10
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3V and 5V ELECTRICAL CHARACTERISTICS
V
S
= 3V, 0V; V
S
= 5V, 0V; R
L
= 20k, V
CM
= V
REF
= half supply, T
A
= 25°C, unless otherwise noted.
SYMBOL PARAMETER
G
Gain Range
Gain Error (Note 6)
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)
Gain Nonlinearity (Note 6)
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
V
OST
V
OSI
V
OSO
I
OS
I
B
e
n
Total Input Referred Offset Voltage V
OST
= V
OSI
+ V
OSO
/G
Input Offset Voltage
Output Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage,
RTI (Referred to Input)
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
15
150
0.2
19
5.0
1.5
1.0
100
750
4
40
20
650
0.2
19
4.6
1.1
160
3000
4
40
µV
µV
nA
nA
µV
P-P
µV
P-P
µV
P-P
LT1789-1
MIN
TYP
MAX
1
0.02
1000
10
0.20
1000
%
LT1789-10
MIN
TYP
MAX
UNITS
0.06
0.06
0.13
35
0.25
0.27
100
0.01
0.09
0.16
0.25
0.30
12
18
90
40
75
15
20
100
100
100
2
U
%
%
%
ppm
ppm
ppm
ppm
1789f
W
U
U
W W
W
LT1789-1/LT1789-10
3V and 5V ELECTRICAL CHARACTERISTICS
V
S
= 3V, 0V; V
S
= 5V, 0V; R
L
= 20k, V
CM
= V
REF
= half supply, T
A
= 25°C, unless otherwise noted.
SYMBOL PARAMETER
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
Output Noise Voltage Density,
RTI
Input Noise Current
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio 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
Power Supply Rejection Ratio
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
f
O
= 1kHz (Note 7)
f
O
= 1kHz (Note 3)
f
O
= 0.1Hz to 10Hz
f
O
= 1kHz
V
IN
= 0V to (+V
S
) – 1V (Note 6)
Differential
Common Mode
0
0.75
48
330
16
62
1.6
1.6
1.6
+V
S
– 1
0
0.75
85
52
270
16
62
1.6
1.6
1.6
+V
S
– 1.2
90
nV/√Hz
nV/√Hz
pA
P-P
fA/√Hz
GΩ
pF
pF
V
CONDITIONS
MIN
LT1789-1
TYP
MAX
MIN
LT1789-10
TYP
MAX
UNITS
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
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
1789f
3
LT1789-1/LT1789-10
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Gain Error (Note 6)
CONDITIONS
The
q
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
q
q
q
q
LT1789-10
MIN
TYP
MAX
UNITS
%
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)
0.25
0.53
0.55
185
0.30
0.53
%
%
ppm
Gain Nonlinearity (Note 6)
G = 1, V
O
= 0.3V to (+V
S
) – 1V
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)
G = 10
G = 100
q
q
q
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
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
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)
(Note 6)
Total Input Referred Offset Voltage V
OST
= V
OSI
+ V
OSO
/G
q
q
q
q
q
q
q
q
q
q
q
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
q
G=1
G = 10
q
G = 100, 1000
q
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)
q
q
q
q
q
q
q
77
94
98
88
98
100
2.5
115
110
+V
S
– 0.38
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
+V
S
– 0.38
1789f
4
LT1789-1/LT1789-10
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Gain Error (Note 6)
CONDITIONS
The
q
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
q
q
q
q
LT1789-10
MIN
TYP
MAX
UNITS
%
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)
0.30
0.57
0.59
250
0.35
0.62
%
%
ppm
Gain Nonlinearity (Note 6)
G = 1, V
O
= 0.3V to (+V
S
) – 1V
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)
G = 10
G = 100
q
q
q
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
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
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)
(Note 6)
Total Input Referred Offset Voltage V
OST
= V
OSI
+ V
OSO
/G
q
q
q
q
q
q
q
q
q
q
q
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
G=1
G = 10
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)
q
q
q
q
q
q
q
q
q
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
q
+V
S
– 0.40
+V
S
– 0.40
1789f
5
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