MAX2365ETM+T【PDF 14/29 页】IC TRANSMITTER QUAD 48TQFN-EP

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Sheet目录55

10页 11页 12页 13页 [14页]15页 16页 17页 18页

Complete Dual-Band

Quadrature Transmitters

14 ______________________________________________________________________________________

Cascaded Performance

Tables 11 and 12 show the typical cascaded perfor-

mance for TDMA and W-CDMA systems.

3-Wire Interface

Figure 5 shows the 3-wire interface timing diagram. The

3-wire bus is SPI/QSPI/MICROWIRE compatible.

Electromagnetic

Compliance Considerations

Two major concepts should be employed to produce a

low-spur and EMC-compliant transmitter: minimize cir-

cular current-loop area to reduce H-field radiation. To

minimize circular current-loop area, bypass as close to

the part as possible and use the distributed capaci-

tance of a ground plane. To minimize voltage drops,

make V

traces short and wide, and make RF traces

short.

Program only the necessary bits in any register to mini-

mize clock cycles. RC filtering can also be used to slow

the clock edges on the 3-wire interface, reducing high-

frequency spectral content. RC filtering also provides

for transient protection against IEC802 testing by shunt-

ing high frequencies to ground, while the series resis-

tance attenuates the transients for error-free operation.

The same applies to the logic input pins (SHDN,

TXGATE, IDLE).

Figure 1. Register Configuration

MSB

24 BIT REGISTER

LSB

DATA 20 BITS

ADDRESS 4 BITS

B18

B16

B19

B17

B14

B12

B15

B13

B10

B11

RFM DIVIDE RATIO (18)

ADDRESS

B16

B17

B14

B12

B15

B13

B10

B11

RFM DIVIDE REGISTER

RFR DIVIDE RATIO (13)

ADDRESS

B12

B10

B11

RFR DIVIDE REGISTER

IFM DIVIDE RATIO (14)

ADDRESS

B12

B13

B10

B11

IFM DIVIDE REGISTER

IFR DIVIDE RATIO (11)

ADDRESS

B10

IFR DIVIDE REGISTER

OPERATION CONTROL BITS (16)

ADDRESS

B14

B12

B15

B13

B10

B11

CONTROL REGISTER

CONFIGURATION BITS (16)

ADDRESS

B14

B12

B15

B13

B10

B11

CONFIGURATION REGISTER

TEST REGISTER

CURRENT CONTROL REGISTER

X = DONT CARE

ADDRESS

B11

B10

B13

B12

B15

ADDRESS

CURRENT CONTROL BITS (16)

B14

TEST BITS (9)

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