LTC5582

9

Rev. D

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PIN FUNCTIONS

VCC (Pin 1): Power Supply Pin. Typical current consump-

tion is 41.6mA at room temperature. This pin should be

externally bypassed with 1nF and 1µF chip capacitors.

IN+, IN– (Pins 2, 4): Differential Input Signal Pins. Either

one can be driven with a single-ended signal while the

other is AC-coupled to ground. These pins can also be

driven with a differential signal. The pins are internally

biased to 1.585V and should be DC blocked externally. The

differential impedance is typically 400Ω. The impedance

of each pin to the DEC pin is 200Ω.

DEC (Pin 3): Input Common Mode Decoupling Pin. This

pin is internally biased to 1.585V and connected to an on-

chip 50pF capacitor to ground. The impedance between

DEC and IN+ (or IN–) is 200Ω. The pin can be connected

to the center tap of an external balun when terminated

differentially. The pin can be floating or connected to

ground via an AC-decoupling capacitor when driven either

in single-ended or differential input configuration.

GND (Pin 5, Exposed Pad Pin 11): Circuit Ground Return

for the Entire IC. This must be soldered to the printed

circuit board ground plane.

OUT (Pin 6): DC Output Pin. The output impedance is

mainly determined by an internal 100Ω series resistance

whichprovidesprotectioniftheoutputisshortedtoground.

RT2 (Pin 7): Optional Control Pin for 2nd-Order Output

Temperature Compensation. Connect this pin to ground to

disable it. The output voltage will decrease with respect to

the room temperature (25°C) by connecting it to ground

via an off-chip resistor when the ambient temperature is

either higher or lower.

RT1 (Pin 8): Optional Control Pin for 1st-Order Output

Temperature Compensation. Connect this pin to ground

to disable it. The output voltage will increase inversely

proportional to ambient temperature.

EN (Pin 9): Enable Pin. An applied voltage above 1V will

activate the bias for the IC. For an applied voltage below

0.4V, the circuits will be shut down (disabled) with a reduc-

tion in power supply current. If the enable function is not

required, then this pin can be connected to VCC. Typical

enable pin input current is 100μA for EN = 3.3V. Note that

at no time should the Enable pin voltage be allowed to

exceed VCC by more than 0.3V.

FLTR (Pin 10): Connection for an External Filtering Capaci-

torC3.Aminimumof8nFcapacitanceisrequiredforstable

AC average power measurement. This capacitor should

be connected to VCC.