LT1881 Просмотр технического описания (PDF) - Linear Technology

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LT1881

Dual and Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps

Linear Technology 

LT1881/LT1882

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. Split supply operation VS = ±15V, VCM = 0V unless otherwise noted.

(Note 5)

C/I Grades

H/MP Grades

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX MIN TYP MAX UNITS

FPBW

Full-Power Bandwidth

VOUT = 28VP-P

(Note 10)

1.47 2.25

1.47 2.25

kHz

l 1.13

0.79

kHz

ΔVOS

Offset Voltage Match

(LT1881A)

Offset Voltage Match

(LT1881/LT1882)

Offset Voltage Match Drift

(Note 7)

0°C < TA < 70°C

– 40°C < TA < 85°C

(Note 7)

0°C < TA < 70°C

– 40°C < TA < 85°C

– 40°C < TA < 125°C

– 55°C < TA < 125°C

(Notes 6, 7)

35 70

l

125

l

160

42 125

l

175

l

235

l

l

l

0.4 1.1

42 125

435

435

0.4 1.1

μV

μV

μV

μV

μV

μV

μV

μV

μV/°C

ΔIB+

ΔIB+

ΔCMRR

Noninverting Bias Current Match

(LT1881A)

Noninverting Bias Current Match

(LT1881/LT1882)

Common Mode Rejection Match

(Note 7)

0°C < TA < 70°C

– 40°C < TA < 85°C

(Note 7)

0°C < TA < 70°C

– 40°C < TA < 85°C

– 40°C < TA < 125°C

– 55°C < TA < 125°C

(Notes 7, 9)

200 300

pA

l

400

pA

l

500

pA

250 700

l

900

l

1000

l

l

250 700

pA

pA

pA

2000

pA

2000

pA

l 110 125

106 125

dB

Δ+PSRR Positive Power Supply

V– = – 15V, VCM = 0V,

l 108 130

108 130

dB

Rejection Ratio Match

1.5V < V+ < 18V, (Notes 7, 9)

Δ–PSRR Negative Power Supply

V+ = 15V, VCM = 0V,

l 104 130

104 130

dB

Rejection Ratio Match

– 1.5V < V– < – 18V, (Notes 7, 9)

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The inputs are protected by internal resistors and back-to-back

diodes. If the differential input voltage exceeds ±0.7V, the input current

should be limited externally to less than 10mA.

Note 3: A heat sink may be required to keep the junction temperature

below absolute maximum.

Note 4: The LT1881C/LT1882C and LT1881I/LT1882I are guaranteed

functional over the operating temperature range of – 40°C to 85°C.

The LT1882H is guaranteed functional over the operating temperature

range –40°C to 125°C. The LT1882MP is guaranteed functional over the

operating temperature range –55°C to 125°C.

Note 5: The LT1881C/LT1882C are guaranteed to meet specified

performance from 0°C to 70°C. The LT1881C/LT1882C are designed,

characterized and expected to meet specified performance from – 40°C

to 85°C but are not tested or QA sampled at these temperatures. The

LT1881I/LT1882I are guaranteed to meet specified performance from

– 40°C to 85°C. The LT1882H is guaranteed to meet specified performance

from –40°C to 125°C. The LT1882MP is guaranteed to meet specified

performance from –55°C to 125°C.

Note 6: This parameter is not 100% tested.

Note 7: Matching parameters are the difference between amplifiers

A and B in the LT1881; and between amplifiers A and D and B and C in the

LT1882.

Note 8: This parameter is the difference between the two noninverting

input bias currents.

Note 9: ΔCMRR and ΔPSRR are defined as follows: CMRR and PSRR are

measured in μV/V on each amplifier. The difference is calculated in μV/V

and then converted to dB.

Note 10: Full power bandwidth is calculated from the slew rate: FPBW =

SR/2πVP.

18812fb

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