LT5401

1

Rev. 0

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FEATURES

DESCRIPTION

Matched Resistor Network

for Precision Amplifiers

The LT®5401 is an ultra-precision matched resistor net-

work optimized for use with fully differential or differ-

ence amplifiers, and with excellent matching specifica-

tions over the entire temperature range. The LT5401

contains two strings of matched resistors, each provid-

ing three tap points. The resulting matched ratios are

well suited for precisely setting a differential amplifier’s

gain or attenuation.

When used to configure differential or difference gain, the

LT5401’s excellent ratio matching ensures high CMRR,

low gain errors and low gain drift to levels far too dif-

ficult to achieve with discrete passive components. This

high level of precision reduces calibration requirements

in many applications and offers 10 times higher perfor-

mance than a ±0.01% discrete solution.

The LT5401 is available in a compact 10-lead MSOP pack-

age with exposed paddle for improved thermal perfor-

mance over a temperature range of –55°C to 150°C.

APPLICATIONS

n

Optimized for Use with Fully Differential and

Difference Amplifiers

n

Excellent Matching

n

±0.003% Resistor Ratio Matching (Max)

n

96.5dB CMRR (Min)

n

±25ppm Gain Error (Max)

n

±0.5ppm/°C Matching Temperature Drift (Max)

n

±35V Operating Voltage (±36V Abs Max)

n

8ppm/°C Absolute Resistor Value Temperature Drift

n

Long-Term Stability: <8ppm at 6500Hours

n

ESD Protected Inputs

n

–55°C to 150°C Operating Temperature

n

10-Lead MSOP Package

n

Fully Differential Amplifiers

n

Difference Amplifiers

n

Reference Dividers

n

Precision Summing/Subtracting

TYPICAL APPLICATION

Input Common Mode Rejection

Ratio vs Frequency

Using LT5401 with a Fully Differential Amplifier for

Single-Ended to Differential Conversion, G = 1

5401 TA01a

+IN

–FB

–IN

+FB

+5V

–5V

OUT1

T1C

T1B

T1A

T2A

IN1

IN2

T2B

T2C

OUT2

700Ω

350Ω

350Ω

350Ω

350Ω

700Ω

700Ω

700Ω

ADA4932

LT5401A

–

+

FREQUENCY (Hz)

100k

1M

10M

100M

50

55

60

65

70

75

80

85

90

95

100

5401 TA01b