ADF4193BCPZ datasheet(20/28 Pages) AD

20 / 28 page

ADF4193

Rev. B | Page 20 of 28

POWER-DOWN REGISTER (R5)

DB7

DB6

DB5

DB4

DB3

DB2

C3 (1)

DB1

C2 (0)

DB0

C1 (1)

CONTROL

BITS

DIFF AMP

DISABLED

ENABLED

DIFF AMP

POWER-DOWN

NORMAL OPERATION

3-STATE ENABLED

CHARGE PUMP

3-STATE

NORMAL OPERATION

COUNTER RESET

DISABLED

ENABLED

CHARGE PUMP

POWER-DOWN

Figure 34. Power-Down Register (R5)

R5, the power-down register (C3, C2, C1 set to 1, 0, 1,

respectively) can be used to software power down the PLL and

differential amplifier sections. After power is initially applied,

there must be writes to R5 to clear the power-down bits and to

R2, R1, and R0 before the ADF4193 comes out of power-down.

Power-Down Differential Amplifier

When Bit DB6 and Bit DB7 are set high, the differential

amplifier is put into power-down. When Bit DB6 and Bit DB7

are set low, normal operation is resumed.

Power-Down Charge Pump

Setting Bit DB5 high activates a charge pump power-down and

the following events occur:

• All active dc current paths are removed, except for the

differential amplifier.

• The R and N divider counters are forced to their load state

conditions.

• The charge pump is powered down with its outputs in three-

state mode.

• The digital lock detect circuitry is reset.

• The RF

input is debiased.

• The reference input buffer circuitry is disabled.

• The serial interface remains active and capable of loading and

latching data.

For normal operation, Bit DB5 should be set to 0, followed by a

write to R0.

CP Three-State

When this bit is set high, the charge pump outputs are put into

three-state. With the bit set low, the charge pump outputs are

enabled.

Counter Reset

When this bit is set to 1, the counters are held in reset. For

normal operation, this bit should be 0, followed by a write to R0.

ADF4193BCPZ Datasheet(PDF) 20 Page - Analog Devices

ADF4193BCPZ Datasheet(HTML) 20 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Datasheet Download

Link URL