LT1789-1/LT1789-10

1

1789fc

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

outputrangewhenanamplificationof10orgreaterisrequired,

allowingprecisesignalprocessingwhereotherinstrumenta-

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.

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Micropower,

Single Supply Rail-to-Rail

Output Instrumentation Amplifiers

0.5A to 4A Voltage Controlled Current Source

G = 1 to 1000 (LT1789-1)

G = 10 to 1000 (LT1789-10)

5

7

4

* ENSURE ADEQUATE POWER

DISSIPATION CAPABILITY AT

HIGHER VOLTAGES,

CURRENTS AND DUTY CYCLES

1789 TA01

0.1Ω

TIP127*

6

3

2

R4

10k

C2

3300pF

R3

100Ω

C3

0.1μF

2

1

3

8

C1

4700pF

7

R2

10k

6

4

5

R1

90.9k

4

3

2

1

120Ω

8k

= 1A PER VOLT AS SHOWN

RISE TIME ≈ 250μs, 10% TO 90%,

1A TO 2A OUTPUT STEP INTO 0.25Ω LOAD

LT1636

–

+

REF

LT1789-1