L4981AD datasheet(6/17 Pages) STMICROELECTRONICS

6 / 17 page

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Prameter

Test Condition

Min.

Typ.

Max.

Unit

MULTIPLIER SECTION

Multipler Output Current

VVA-OUT = 4V, VRMS = 2V,

VMULTOUT =0, VLFF = 5.1V

IAC =50

µA, COSC =0V

µA

VVA-OUT = 4V, VRMS = 2V,

VMULTOUT =0, VLFF = 5.1V

IAC = 200

µA, COSC =0V

100

135

170

µA

VVA-OUT = 2V, VRMS = 2V,

VMULTOUT =0, VLFF = 5.1V

IAC = 100

µA, COSC =0V

µA

VVA-OUT = 2V, VRMS = 4V,

VMULTOUT =0, VLFF = 5.1V

IAC = 100

µA, COSC =0V

5.5

µA

VVA-OUT = 4V, VRMS = 4V,

VMULTOUT =0, VLFF = 5.1V

IAC = 100

µA, COSC =0V

µA

VVA-OUT = 4V, VRMS = 2V,

VMULTOUT =0, VLFF = 2.5V

COSC = 0V, IAC = 200

µA

VVA-OUT = 4V, VRMS =4V

VMULTOUT =0, VLFF = 5.1V

IAC = 200

µA, COSC =0V

µA

VVA-OUT = 2V, VRMS = 4V,

VMULTOUT =0, VLFF = 5.1V

IAC =0, COSC =0V

-2

µA

Multiplier Gain

0.37

IMULT−OUT = K ⋅ IAC

(VVA−OUT − 1.28) ⋅ (0.8 ⋅ VLFF − 1.28)

(VVRMS)2

if VLFF =VREF;

IMULT−OUT = IAC

(VVA−OUT − 1.28)

(VVRMS)

⋅ K1

where: K1 = 1V

Figure 1: MULTI-OUT vs. IAC (VRMS = 1.7V;

VLFFD = 5.1V)

Figure 2: MULTI-OUT vs. IAC (VRMS = 2.2V;

VLFFD = 5.1V)

L4981A - L4981B

6/17

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