SAP5SD-A-G1-R datasheet(27/66 Pages) IDT

27 / 66 page

SAP51 / SAP5S Datasheet

January 28, 2016

5.1.2.

Input Impedance (AS-Interface Bus Load)

Table 5.2

AS-Interface Bus Load Properties

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNIT

Equivalent resistor of the SAP5

1), 2)

RIN1

13.5

Ω

Equivalent inductor of the SAP5

1), 2)

LIN1

13.5

Equivalent capacitor of the SAP5

1), 2)

CIN1

Equivalent resistor of the SAP5

1), 2)

RIN2

13.5

Ω

Equivalent inductor of the SAP5

1), 2)

LIN2

13.5

Equivalent capacitor of the SAP5

1), 2)

CIN2

15 + (L-12mH)

∗10pF/mH

Parasitic capacitance of the external

over-voltage protection diode (Zener

diode)

CZener

The equivalent circuit of a slave, which is calculated from the impedance of the SAP5 and the parallel external over-voltage

protection diode (Zener diode), must satisfy the requirements of the AS-Interface Complete Specification for Extended Address

Mode slaves.

After the maximum parasitic capacitance of the external over-voltage protection diode (20pF) has been subtracted, the specifications

group including RIN1, LIN1 and CIN1 or the specifications group including RIN2, LIN2 and CIN2 must be met for compliance with the

AS-Interface Complete Specification V3.0.

Table 5.3

CDC Pin Parameters

PARAMETER

SYMBOL

CONDITIONS

MIN

Typical

MAX

UNIT

Input voltage range

VCDC_IN

-0.3

VU5R

External decoupling capacitor

CCDC

100

Note: A decoupling capacitor defines the internal low-pass filter time constant; lower values decrease the impedance but improve the

turn-on time. Higher values do not improve the impedance but do increase the turn-on time. The turn-on time also depends on the load

capacitor at UOUT. After connecting the slave to the power, the capacitor is charged with the maximum current IUOUT. The impedance will

increase when the voltage allows the analog circuitry to fully operate.

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