CC400-RTR2 datasheet(23/31 Pages) TI

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CC400

SWRS050

Page 23 of 32

NAME

Default

value

Active

Description

A[12]

Power Down

0 = Chip Enable

1 = Chip Disable (only reference oscillator core on)

A[11]

RXTX

Receive/Transmit-mode control

0 = Receive mode

1 = Transmit mode

A[10:8]

S[2:0]

000

Synthesiser test modes (apply when TDEM2=0)

Modus (000):

Normal operation: Rx/Tx.

Modus (001):

Divided signal from VCO at PD input monitored at LOCK pin.

Modulation (control of A-counter) is disabled.

Modus (010):

Divided signal from VCO at PD input monitored at LOCK pin.

Modulation (control of A-counter) is enabled.

Modus (011):

Output from reference divider monitored at LOCK pin.

Modus (100):

Signal at TX_DATA pin used as modulation control overriding

the signal from the dual-modulus divider. Output monitored at

LOCK pin.

Modus (101):

Output from prescaler monitored at LOCK pin.

Modulation (A-divider control) disabled.

Modus (110):

Output from prescaler monitored at LOCK pin.

Modulation (A-divider control) disabled.

Modus (111):

Shift register data output monitored at LOCK pin.

A[7:6]

PA[3:2]

PA gain programming. Part of PA4:PA0. (PA1:PA0 is in frame

D, PA4 is in frame C)

A[5:4]

LNA[1:0]

LNA bias current and gain

00 = 0.94mA=I0

01 = 1.5* I0=1.40mA

10 = 2* I0 =1.87mA (nominal setting)

11 = 3* I0=2.81mA

A[3:2]

MIX[1:0]

MIXER bias current and gain

00 = 0.36mA

01 = 0.54mA

10 = 0.72mA (nominal setting)

11 = 1.08mA

A[1:0]

LO[1:0]

LO drive (peak-differential = peak-peak single-ended)

00 = 144mV

01 = 288mV

10 = 432mV (nominal setting)

11 = 720mV

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