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LT5537

Wide Dynamic Range RF/IF Log Detector

Linear Technology 

LT5537

APPLICATIO S I FOR ATIO

Enable Pin Operation

The enable circuit of the LT5537 is shown in a simplified

form in Figure 12. When the voltage at the ENBL pin is ≥1V,

the enable circuit biases the chip up for normal operation.

The current drawn by the ENBL pin is dependent on the

voltage on that pin. At VCC = ENBL = 3V, the ENBL current

is typically 100µA. At VCC = ENBL = 5V, the ENBL current

increases to about 200µA. When the voltage at the ENBL

pin is ≤0.3V, or if the pin is not connected, the chip is

disabled and draws a reduced supply current of about

500µA, with VCC = 3V.

INPUT

C1

100pF

R2

51Ω

C2

100pF

LT5537

1

ENBL

8

OUT

2 IN+

7

VEE

3 IN–

4 CAP+

6

VCC

CAP– 5

ENBL

25k

5537 F04

Figure 12. Equivalent ENBL Input Circuit

R1

33k

C3

1nF

ENBL

OUTPUT

VCC

C4

1µF

C6

33nF

5537 F19

Figure 13. Application Board Schematic

Figure 14. Layout of the Evalulation Board

5537fa

14

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