AS3911 datasheet(11/149 Pages) AMSCO

11 / 149 page

ams Datasheet, Confidential: 2013-Oct [2-03]

AS3911 – 11

El ec trical Charac t e ristics

RRFO

RFO1 and RFO2

driver output

resistance

0.6

1.8

IRFO = 10 mA

The following measurement procedure

which cancels resistance of

measurement setup is used:

• All driver segments are switched

on, resistance is measured,

• All driver segments except the

MSB segment are switched on,

resistance is measured,

• Difference between the two

measurements is resistance of

MSB segment,

• Resistance of MSB segment

divided by two is the value of

RRFO.

VRFI

RFI input

sensitivity

0.5

mVrms

fSUB=848 kHz, AM channel with peak

detector input stage selected.

RRFI

RFI input

resistance

VPOR

Power on Reset

voltage

1.2

1.65

2.0

VAGD

AGD voltage

1.4

1.5

1.6

MCU_CLK), register 01h set to C0h (3V

supply mode, disable VSP_D), register

02h set to 80h, register 03h set to 08h,

other registers in default state, short

VSP_A and VSP_D.

VREG

Regulated

voltage

2.85

3.0

3.15

Manual regulator mode, regulated

voltage set to 3.0V, measured on pin

VSP_RF: register 00h set to 0Fh, register

01h set to 80h (3V supply mode),

enable Tx), register 2Ah set to D8h.

TOSC

Oscillator start-up

time

0.7

13.56MHz or 27.12MHz crystal

RS = 50 Ω max, load capacitance

according to crystal specification, IRQ is

issued once the oscillator frequency is

stable.

Symbol

Parameter

Min

Typ

Max

Unit

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