AD7729

–13–

REV. 0

Table IV. Baseband and Auxiliary Registers

Name

R/W

Address

Reset

Reserved

000000 (0)

Reserved

000001 (1)

Reserved

000010 (2)

IRxOFFSET

R/W

000011 (3)

BRESET

QRxOFFSET

R/W

000100 (4)

BRESET

Reserved

000101 (5)

Reserved

000110 (6)

RxDELAY1

R/W

000111 (7)

BRESET

RxDELAY2

R/W

001000 (8)

BRESET

ARDADDR

R/W

001001 (9)

SRESET

BRDADDR

R/W

001010 (10)

SRESET

Reserved

001011 (11)

AUXDAC

R/W

001100 (12)

ARESET

Reserved

001101 (13)

Reserved

001110 (14)

Reserved

001111 (15)

Reserved

010000 (16)

Reserved

010001 (17)

ACRA

R/W

010010 (18)

ARESET

ACRB

R/W

010011 (19)

ARESET

BCRA

R/W

010100 (20)

BRESET

BCRB

R/W

010101 (21)

BRESET

Reserved

010110 (22)

Reserved

010111 (23)

Reserved

011000 (24)

ASCLKRATE

R/W

011001 (25)

SRESET

BSCLKRATE

R/W

011010 (26)

SRESET

BRESET: can be reset using pin RESETB or bit BRESET.

ARESET: can be reset using pin RESETB or bit ARESET.

SRESET: only the pin RESETB can reset these registers.

Table V. Baseband Control Register A (BCRA)

Bit

Name

Function

BCRA0

MCLKDIV

MCLK Divider. When this bit is

set to 0, the internal MCLK has

the same value as the external

MCLK. When this bit equals 1,

the external MCLK is divided by

2 within the AD7729 so that the

device operates at half the exter-

nal clock frequency.

BCRA1

RxAUTOCAL

Selects AutoCal when set to 1

and UserCal when set to 0.

BCRA2

RxEXTCAL

When set to 1, the Rx calibration

operates in external mode i.e.,

the I and Q analog inputs remain

connected to the pins during the

Rx autocalibration routine.

BCRA3

RxPOWER0

This bit, in conjunction with

RxPOWER1, is used to reduce

the analog current consumption

of the ADCs.

BCRA4

RxPOWER1

This bit, in conjunction with

RxPOWER0, is used to reduce

the analog current consumption

of the ADCs.

BCRA5

Reserved

BCRA6

RxON

Power-on for the receive section

of the AD7729.

BCRA7

BRESET

Baseband Reset.

BCRA8

Reserved

BCRA9

Reserved

Table VI. Power Modes for the ADCs

RxPOWER1

RxPOWER0

AIDD1 Reduction

0

0

Reserved

0

1

1/3 (Power Mode 1)

1

0

2/5 (Power Mode 2)

1

1

Reserved

Bits RxPOWER0 and RxPOWER1 are used to reduce the ana-

log current consumption of the ADCs. The part is specified in

Power Mode 1. In Power Mode 2, the MCLK needs to be less

than 10 MHz. The performance of the part will then be compa-

rable to the performance in Power Mode 1 except that the ADC

current will now be less than 9.5 mA.

Table VII. Receive Section Activation

RxON Pin

RxON Bit

Receive Section

0

0

OFF

01

ON

10

ON

11

ON