ICL7650SCBA-1 查看數據表（PDF） - Intersil

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ICL7650SCBA-1

2MHz, Super Chopper-Stabilized Operational Amplifier

Intersil 

ICL7650S

R2

INPUT

R1

CLAMP

-

7650S

+C

CR

0.1µF

0.1µF

OUTPUT

(R1||R2) ≥ 100kΩ

For Full Clamp Effect

NOTE: R1||R2 indicates the parallel combination of R1 and R2.

FIGURE 3. INVERTING AMPLIFIER WITH (OPTIONAL) CLAMP

Normal logarithmic amplifiers are limited in dynamic range in

the voltage-input mode by their input-offset voltage. The

built-in temperature compensation and convenience features

of the ICL8048 can be extended to a voltage-input dynamic

range of close to 6 decades by using the ICL7650S to offset-

null the ICL8048, as shown in Figure 6. The same concept

can also be used with such devices as the HA2500 or

HA2600 families of op amps to add very low offset voltage

capability to their very high slew rates and bandwidths. Note

that these circuits will also have their DC gains, CMRR, and

PSRR enhanced.

CLAMP

+

+7.5V

+15V

IN

7650S

-

-7.5V

+

741

-

-15V

OUT

0.1µF

0.1µF

10kΩ

10kΩ

FIGURE 4. USING 741 TO BOOST OUTPUT DRIVE CAPACITY

0.1µF

0.1µF

VIN

C

+

R

C

7650S

-

VOUT

CLAMP R

VTH

200kΩ - 2MΩ

FIGURE 5. LOW OFFSET COMPARATOR

VREF

RREF

V+

(+15V)

-

33kΩ

33kΩ

IREF

R5

ICL7650S

54

16 13 2kΩ 12

+

IIN

Q1

Q2

VIN

RIN

2

-

A1

+

1

R3

+

-A2

VOUT

10

R1

ICL8048

GROUND

GAIN

15.9kΩ

150pF C1

7

15

R2

680Ω 1kΩ

R0

10kΩ

(LOW T.C.)

NOTE: For further Applications Assistance, see A053 and R017.

FIGURE 6. ICL8048 OFFSET NULLED BY ICL7650S

7

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