MICRF610 datasheet(13/20 Pages) MICREL

13 / 20 page

Micrel, Inc.

MICRF610/MICRF610Z

July 2006

M9999-120205

Tuning range

800

850

900

950

1000

00,5

11,5

22,5

Varactor voltage (V)

'10'

'11'

Figure 6. RF Frequency vs. Varactor Voltage

and VCO Frequency bit (V

= 2.25V)

Lock Detect

A6..A0

0000001

‘1’

‘0’

RSSI_en

LD_en

PF_FC1

PF_FC0

A lock detector can be enabled by setting LD_en = 1.

When pin LD is high, it indicates that the PLL is in lock.

When entering TX, the procedure is first to load the TX

word and then turn on the PA stage. During the PA ramp

up time, the LD signal may indicate out of lock. It is first

when the PA stage is fully on that the LD signal will

indicate in “Lock”. During transmission, the Lock Detect

signal will have transitions and the user should therefore,

ignore the Lock detect signal.

Modes of Operation

A6..A0

0000000

LNA_by

PA2

PA1

PA0

Sync_en

Mode1

Mode0

’1’

Mode1

Mode0

State

Comments

Power down

Keeps register configuration

Standby

Only crystal oscillator running

Receive

Full receive

Transmit

Full transmit ex PA state

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