Rainbow-electronics MAX4329 Bedienungsanleitung PDF herunterladen (Seite 8)

MAX4322/MAX4323/MAX4326/MAX4327/MAX4329

Single/Dual/Quad, Low-Cost, SOT23,

Low-Power, Rail-to-Rail I/O Op Amps

8 _______________________________________________________________________________________

Pin Description

__________

Applications Information

Rail-to-Rail Input Stage

Devices in the MAX4322/MAX4323/MAX4326/MAX4327/

MAX4329 family of high-speed amplifiers have rail-to-

rail input and output stages designed for low-voltage,

single-supply operation. The input stage consists of

separate NPN and PNP differential stages, which com-

bine to provide an input common-mode range extend-

ing to the supply rails. The PNP stage is active for input

voltages close to the negative rail, and the NPN stage

is active for input voltages near the positive rail. The

input offset voltage is typically below 250µV. The

switchover transition region, which occurs near V

/ 2,

has been extended to minimize the slight degradation in

CMRR caused by the mismatch of the input pairs. Their

low offset voltage, high bandwidth, and rail-to-rail com-

mon-mode range make these op amps excellent choices

for precision, low-voltage, data-acquisition systems.

Since the input stage switches between the NPN and

PNP pairs, the input bias current changes polarity as

the input voltage passes through the transition region.

To reduce the offset error caused by input bias cur-

rents flowing through external source impedances,

match the effective impedance seen by each input

(Figures 1a, 1b). High source impedances, together

Inverting Inputs for amps 1

and 2

IN1-, IN2-

Noninverting Inputs for amps

1 and 2

IN1+, IN2+

Shutdown Control for amps 1

and 2. Tie high or leave float-

ing to enable amplifier.

SHDN1,

SHDN2

Outputs for amps 3 and 4

OUT3,

OUT4

Inverting Inputs for amps 3

and 4

IN3-, IN4-

Positive SupplyV

No ConnectionN.C.

Shutdown Control. Tie high or

leave floating to enable

amplifier.

SHDN

Outputs for amps 1 and 2

OUT1,

OUT2

Inverting InputIN-

Noninverting Input IN+

Negative Supply. Ground for

single-supply operation.

OutputOUT

SOT23-5

MAX4326

—

µMAX

2, 6

3, 5

—

1, 7

—

2, 8

3, 7

5, 6

—

1, 9

—

2, 12

3, 11

5, 9

—

5, 7, 8,

—

1, 13

—

Noninverting Inputs for amps

3 and 4

IN3+, IN4+— — — —

MAX4329

2, 6

3, 5

—

8, 14

9, 13

—

1, 7

—

10, 12

SO/µMAX

—

1, 5, 8

—

MAX4322 MAX4327

NAME

MAX4323

SOT23-6

—

SO/µMAX

—

1, 5

—

FUNCTION

1 2 3 4 5 6 7 8 9 10 11 12

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