LT1789-1/LT1789-10
Micropower,
Single Supply Rail-to-Rail
Output Instrumentation Amplifiers
FEATURES DESCRIPTION
n
Micropower: 95A Supply Current Max The LT 1789-1/LT1789-10 are micropower, precision
n
Low Input Offset Voltage: 100V Max instrumentation amplifiers that are optimized for single
n
Low Input Offset Voltage Drift: 0.5V/C Max supply operation from 2.2V to 36V. The quiescent current
n
Single Gain Set Resistor: is 95A max, the inputs common mode to ground and the
G = 1 to 1000 (LT1789-1) output swings within 110mV of ground. The gain is set
G = 10 to 1000 (LT1789-10) with a single external resistor for a gain range of 1 to 1000
n
Inputs Common Mode to V for the LT1789-1 and 10 to 1000 for the LT1789-10.
n
Wide Supply Range: 2.2V to 36V Total Supply
The high accuracy of the LT1789-1 (40ppm maximum non-
n
CMRR at G = 10: 96dB Min
linearity and 0.25% max gain error) is unmatched by other
n
Gain Error: G = 10, 0.25% Max
micropower instrumentation amplifiers. The LT1789-10
n
Gain Nonlinearity: G = 10, 40ppm Max
maximizes both the input common mode range and dynamic
n
Input Bias Current: 40nA Max
output range when an amplification of 10 or greater is required,
n
PSRR at G = 10: 100dB Min
allowing precise signal processing where other instrumenta-
n
1kHz Voltage Noise: 48nV/Hz
tion amplifiers fail to operate. The LT1789-1/LT1789-10 are
n
0.1Hz to 10Hz Noise: 1.5V
P-P
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
APPLICATIONS
(LT1789-10) in any gain configuration while the inputs are
n
Portable Instrumentation
ESD protected up to 10kV (human body).
n
Bridge Amplifiers
n
Strain Gauge Amplifiers
The LT1789-1/LT1789-10 are offered in the 8-pin SO
n
Thermocouple Amplifiers
package, requiring significantly less PC board area than
n
Differential to Single-Ended Converters
discrete multi op amp and resistor designs.
n
Medical Instrumentation
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.
TYPICAL APPLICATION
0.5A to 4A Voltage Controlled Current Source
C1
V
S
4700pF
C3
V
120
S
R1
0.1F 8k
90.9k
2 7
R3
TIP127*
V
IN
100
6
R2
LT1636
10k
3 +
V * ENSURE ADEQUATE POWER
5
S
DISSIPATION CAPABILITY AT
4
7
3 HIGHER VOLTAGES,
3
CURRENTS AND DUTY CYCLES
R4
8
1
10k
6
R *
LT1789-1 SENSE
REF
0.1
I
LOAD
2
C2
V = 3.3V TO 32V 1
S
3300pF
5
V 4
IN
I =
LOAD
2
R 10
SENSE
4
R *
LOAD
= 1A PER VOLT AS SHOWN
RISE TIME 250s, 10% TO 90%,
1A TO 2A OUTPUT STEP INTO 0.25 LOAD 1789 TA01
1789fc
1
+LT1789-1/LT1789-10
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
+
TOP VIEW
Supply Voltage (V to V )..........................................36V
R 1 8 R
Input Differential Voltage ..........................................36V G G
IN 2 7 +V
Input Current (Note 3) ......................................... 20mA S
+IN OUT
3 6
Output Short-Circuit Duration .......................... Indefinite
V 4 5 REF
Operating Temperature Range .................40C to 85C S
Specified Temperature Range (Note 4)
S8 PACKAGE
8-LEAD PLASTIC SO
LT1789C-1, LT1789C-10 .......................40C to 85C
T = 150C, = 190C/W
JMAX JA
LT1789I-1, LT1789I-10 ........................40C to 85C
Storage Temperature Range .................. 65C to 150C
Lead Temperature (Soldering, 10 sec)...................300C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1789CS8-1#PBF LT1789CS8-1#TRPBF 17891 8-Lead Plastic SO 40C to 85C
LT1789IS8-1#PBF LT1789IS8-1#TRPBF 1789I1 8-Lead Plastic SO 40C to 85C
LT1789CS8-10#PBF LT1789CS8-10#TRPBF 178910 8-Lead Plastic SO 40C to 85C
LT1789IS8-10#PBF LT1789IS8-10#TRPBF 789I10 8-Lead Plastic SO 40C to 85C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1789CS8-1 LT1789CS8-1#TR 17891 8-Lead Plastic SO 40C to 85C
LT1789IS8-1 LT1789IS8-1#TR 1789I1 8-Lead Plastic SO 40C to 85C
LT1789CS8-10 LT1789CS8-10#TR 178910 8-Lead Plastic SO 40C to 85C
LT1789IS8-10 LT1789IS8-10#TR 789I10 8-Lead Plastic SO 40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: