MAX2369EGM+TD【PDF 10/16 页】IC TRANSMITTER QUAD 48QFN-EP

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Sheet目录55

6页 7页 8页 9页 [10页]11页 12页 13页 14页

Complete Dual-Band

Quadrature Transmitter

10 ______________________________________________________________________________________

The IFM register sets the main frequency divide ratio

for the IF PLL. The IFR register sets the reference fre-

quency divide ratio. The IF VCO frequency can be

determined by the following:

IF VCO frequency = f

REF

(IFM / IFR)

where f

REF

is the external reference frequency.

The operational control register (OPCTRL) controls the

state of the MAX2369. See Table 3 for the function of

each bit.

The configuration register (CONFIG) sets the configura-

tion for the IF PLL and the baseband I/Q input levels

See Table 4 for a description of each bit.

The test register is not needed for normal use.

Power Management

Bias control is distributed among several functional

sections and can be controlled to accommodate many

different power-down modes as shown in Table 5.

The shutdown control bit is of particular interest since it

differs from the SHDN pin. When the shutdown control

bit is active (SHDN_BIT = 0), the serial interface is left

active so that the part can be turned on with the serial

bus while all other functions remain shut off. In contrast,

Table 1. Register Power-Up Default States

Table 2. Register Initialization for F

REF

19.44MHz, F

= 181.26MHz,

COMP

= 360kHz

Figure 1. Register Configuration

MSB

24 BIT REGISTER

LSB

DATA 20 BITS

ADDRESS 4 BITS

B19 B18 B17 B16 B15 B14 B13 B12 B11 B10

IFM DIVIDE RATIO REGISTER (14 BITS)

ADDRESS

B13 B12 B11 B10

IFR DIVIDE RATIO REGISTER (11 BITS)

ADDRESS

B10

CONTROL REGISTER (16 BITS)

ADDRESS

B15 B14 B13 B12 B11 B10

CONFIGURATION REGISTER (16 BITS)

ADDRESS

B15 B14 B13 B12 B11 B10

TEST REGISTER (8 BITS)

ADDRESS

X = DONT CARE

FUNCTION

IFM

6519 dec

0010

IF M divider count

IFR

0492 dec

0011

IF R divider count

OPCTRL

892F hex

0100

Operational control

settings

CONFIG

D03F hex

0101

Configuration and

setup control

TEST

0000 hex

0111

Test-mode control

FUNCTION

IFM

1007 dec

0010

IF M divider count

IFR

0054 dec

0011

IF R divider count

OPCTRL

890F hex

0100

Operational control

settings

CONFIG

903D hex

0101

Configuration and

setup control

TEST

0000 hex

0111

Test-mode control

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