Complete 450MHz Quadrature Transmitter

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13

BIT NAME

BIT

LOCATION

(0 = LSB)

TYPICAL

SETTINGS

FUNCTION

RESERVED

15

0

Reserved. Set to 0 for normal operation.

RCP_TURBO1

14

0

Works with RCP_TURBO2 (in the configuration register) to set the turbo

charge-pump mode (see Table 7).

ICP_MAX

13

0

0 = Normal operation.

1 = Sets IF charge-pump current to turbo level and keeps it there even after

lock is established. This mode provides the highest charge-pump current,

but effectively no turbo mode since current is already at maximum.

RESERVED

12, 11

01

Reserved. Set to 01 for normal operation.

RESERVED

10, 9

00

Reserved. Set to 00 for normal operation.

IFG

8, 7, 6

100

3-bit gain balancing control. Increases IF gain by approximately 2dB per

LSB. Provides a means for adjusting balance between RF and IF gain for

optimized linearity.

RESERVED

5

0

Reserved. Set to 0 for normal operation.

BUF_EN

4

0

LO buffer enable.

0 = LO buffer off.

1 = LO buffer on.

MOD_TYPE

3

1

Selects type of modulation.

0 = Selects direct VCO modulation (IF VCO is directly modulated and the

I/Q modulator is bypassed).

1 = Selects quadrature modulation.

STBY

21

Standby control.

0 = Shuts down everything except the registers and serial interface.

1 = Normal operation.

TXSTBY

11

Transmitter standby control.

0 = Shuts down the modulator and upconverter leaving PLLs locked and

registers active. This bit’s functionality is equivalent to that of the

TX_GATE pin.

1 = Normal operation.

SHDN_BIT

0

1

Shutdown control.

0 = Shuts down everything except the serial interface.

1 = Normal operation.