7650SCBA-1 查看數據表（PDF） - Renesas Electronics

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7650SCBA-1

2MHz, Super Chopper-Stabilized Operational Amplifier

Renesas Electronics 

ICL7650S

R2

INPUT

R1

CLAMP

-

7650S

+

C

R

C

0.1F

0.1F

OUTPUT

(R1||R2)  100k

For Full Clamp Effect

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

FIGURE 3. INVERTING AMPLIFIER WITH (OPTIONAL) CLAMP

CLAMP

+

+7.5V

+15V

IN

7650S

-

-7.5V

+

741

-

-15V

OUT

0.1F

0.1F

10k

10k

FIGURE 4. USING 741 TO BOOST OUTPUT DRIVE CAPACITY

0.1F

0.1F

VIN

C

+

R

C

7650S

-

VOUT

CLAMP

R

VTH

200k - 2M

FIGURE 5. LOW OFFSET COMPARATOR

VREF

RREF

V+

(+15V)

-

33k

33k

IREF

R5

ICL7650S

54

16

13 2k 12

+

IIN

Q1

Q2

VIN

RIN

2

+-A1

1

R3

+

-A2

VOUT

10

R1

ICL8048

GROUND

GAIN

15.9k

150pF C1

7

15

R2

680 1k

NOTE: For further Applications Assistance, see AN053.

R0

10k

(LOW T.C.)

FIGURE 6. ICL8048 OFFSET NULLED BY ICL7650S

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.

FN2920 Rev 10.00

April 12, 2007

Page 7 of 13

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