ICL7650SCPDZ datasheet(7/13 Pages) RENESAS

7 / 13 page

ICL7650S

FN2920 Rev 10.00

Page 7 of 13

April 12, 2007

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.

7650S

0.1

F

OUTPUT

CLAMP

INPUT

0.1

F

(R1||R2)  100k

For Full Clamp Effect

7650S

0.1

F

OUT

CLAMP

0.1

F

741

-7.5V

+7.5V

+15V

-15V

10k



10k



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

FIGURE 3. INVERTING AMPLIFIER WITH (OPTIONAL) CLAMP

FIGURE 4. USING 741 TO BOOST OUTPUT DRIVE CAPACITY

7650S

0.1

F

VOUT

CLAMP

VIN

0.1

F

VTH

200k

 - 2M

FIGURE 5. LOW OFFSET COMPARATOR

ICL7650S

VOUT

15.9k



680



GROUND

RREF



V+

VREF

IREF

GAIN

33k



33k



150pF

10k



(LOW T.C.)

IIN

RIN

VIN

715

(+15V)



ICL8048

NOTE: For further Applications Assistance, see AN053.

FIGURE 6. ICL8048 OFFSET NULLED BY ICL7650S

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