LT1175-5 查看數據表（PDF） - Linear Technology

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LT1175-5

Precision Micropower ∆∑ RMS-to-DC Converter

Linear Technology 

LTC1966

Pin Functions

GND (Pin 1): Ground. A power return pin.

IN1 (Pin 2): Differential Input. DC coupled (polarity is

irrelevant).

IN2 (Pin 3): Differential Input. DC coupled (polarity is

irrelevant).

VSS (Pin 4): Negative Voltage Supply. GND to – 5.5V.

VOUT (Pin 5): Output Voltage. This is high impedance.

The RMS averaging is accomplished with a single shunt

capacitor from this node to OUT RTN. The transfer func-

tion is given by:

(VOUT – OUT RTN) =

Average

(IN2

–

IN1)2





OUT RTN (Pin 6): Output Return. The output voltage is

created relative to this pin. The VOUT and OUT RTN pins

are not balanced and this pin should be tied to a low

impedance, both AC and DC. Although it is typically tied

to GND, it can be tied to any arbitrary voltage, VSS < OUT

RTN < (VDD – Max Output). Best results are obtained when

OUT RTN = GND.

VDD (Pin 7): Positive Voltage Supply. 2.7V to 5.5V.

ENABLE (Pin 8): An Active Low Enable Input. LTC1966

is debiased if open circuited or driven to VDD. For normal

operation, pull to GND, a logic low or even VSS.

1966fb

8

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