AS3911 datasheet(56/149 Pages) AMSCO

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AS3911 – 56

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

A p pl i c at io n I n f o r m at i o n

manual gain reduction from Receiver Configuration Register 4.

This command is accepted in case en (bit 7 of the Operation

Control Register) is set and Xtal oscillator frequency is stable.

Direct command chaining is possible.

IRQ due to termination of direct command is not produced.

Adjust Regulators

When this command is sent the power supply level of VDD is

measured in maximum load conditions and the regulated

voltage reference is set 250 mV below this measured level to

assure maximum possible stable regulated supply (See “Power

Supply System” on page 34.). Using this command increases the

system PSSR.

At the beginning of execution of this command, both the

receiver and transmitter are switched on to have the maximum

current consumption, the regulators are set to the maximum

regulated voltage (5.1 V in case of 5 V supply and 3.4 V in case

of 3.3 V supply mode). After 300 μs VSP_RF is compared to VDD,

in case VSP_RF is not at least 250 mV lower the regulator setting

is reduced for one step (120 mV in case of 5 V supply and 100

mV in case of 3.3 V supply mode) and measurement is done after

next 300 μs. Procedure is repeated until VSP_RF drops at least

250 mV below VDD or until minimum regulated voltage (3.9 V

in case of 5 V supply and 2.4 V in case of 3.3 V supply mode) is

reached.

Duration time: 5 ms max.

This command is accepted in case en (bit 7 of the Operation

Control Register) is set and Xtal oscillator frequency is stable.

This command is not accepted in case the external definition

of the regulated voltage is selected in the Regulator Voltage

Control Register (bit reg_s is set to H)

Direct command chaining is not possible.

IRQ due to termination of direct command is produced after

command execution is terminated.

Calibrate Modulation Depth

Starts a patent pending sequence, which activates the

transmission, measures the modulation depth and adapts it to

comply with the modulation depth specified in the AM

Modulation Depth Control Register. When calibration

procedure is finished result is displayed in the AM Modulation

Depth Display Register. Please refer to See “AM Modulation

Depth: Definition and Calibration” on page 132. for details

about setting the AM modulation depth and running this

command.

Duration time: 275μs max.

This command is accepted in case en (bit 7 of the Operation

Control Register) is set and Xtal oscillator frequency is stable.

Direct command chaining is not possible.

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