MICRF405 datasheet(36/46 Pages) MICREL

36 / 46 page

Micrel

MICRF405

April 2006

M9999-041906

(408) 955-1690

ASK2

ASK1

ASK0

State

3dB ASK depth

6dB ASK depth

9dB ASK depth

12dB ASK depth

15dB ASK depth

18dB ASK depth

21dB ASK depth

> 30dB ASK depth

Table 25. ASK Modulation Depth When PA[2:0]=7.

ASKshape

Comments

0..7

Programmable ASK filter. It can be programmed in eight steps. “0” is no shaping, “7” most shaping.

Table 26. ASK Shaping/Filtering.

XCOtune

Comments

0..31

Programmable XCO load capacitor

Table 27. XCO Capacitor Setting.

XCO_Fast

Comments

The XCO is running on a constant bias current.

When going from PD to TX mode, the XCO is running on a high current during start up.

Table 28. XCO Fast Startup.

Low_Batt_en

LowBatt_level

LDO_by

Comments

Low battery detect circuit off

Low battery detect circuit active. Interrupt is flagged if VDD falls below

2V.

Low battery detect circuit active. Interrupt is flagged if VDD falls below

2.1V.

Low battery detect circuit active. Interrupt is flagged if VDD falls below

1.8V.

Low battery detect circuit active. Interrupt is flagged if VDD falls below

1.9V.

Table 29. Low Battery Detect.

MICRF405 Datasheet(PDF) 36 Page - Micrel Semiconductor

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