MAX2365ETM+T【PDF 16/29 页】IC TRANSMITTER QUAD 48TQFN-EP

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Sheet目录55

12页 13页 14页 15页 [16页]17页 18页 19页 20页

Complete Dual-Band

Quadrature Transmitters

16 ______________________________________________________________________________________

Table 3. Configuration Register (CONFIG)

BIT

LOCATION

(0 = LSB)

POWER-UP

STATE

Determines output mode for LOCK detector pin as follows:

00 = test mode, LD_MODE cannot be 00 for normal operation

01 = IF PLL lock detector

10 = RF PLL lock detector

11 = logical AND of IF PLL and RF PLL lock detectors

1, 0

LD_MODE

Works in conjunction with RCP_TURBO1 (OPCTRL register) to set the turbo-

charge current mode. (See Table 7).

RCP_TURBO2

1 activates turbocharge feature, providing an additional IF charge-pump cur-

rent during frequency acquisition.

IF_TURBO_

CHARGE

RF phase-detector polarity; 1 selects positive polarity (increasing tuning voltage

on the VCO produces increasing frequency); 0 selects negative polarity

(increasing voltage on the VCO produces decreasing frequency).

RF_PD_POL

IF phase-detector polarity; 1 selects positive polarity (increasing tuning voltage

on the VCO produces increasing frequency); 0 selects negative polarity

(increasing tuning voltage on the VCO produces decreasing frequency).

IF_PD_POL

7, 6

9, 8

A 2-bit register sets the RF charge-pump current as follows:

00 = 325礎

01 = 650礎

10 = 738礎

11 = 1063礎

RCP

1 selects 200mV

RMS

input mode; 0 selects 100mV

RMS

input mode.

IQ_LEVEL

1 selects ? on IFLO port; 0 bypasses the divider.

BUF_DIV

1 bypasses IF VCO and enables a buffered input for external VCO use.

VCO_BYPASS

A 2-bit register sets the IF charge-pump current as follows:

00 = 139礎

01 = 192礎

10 = 278礎

11 = 390礎

ICP

0 for normal operation, 1 turns off the bias current to RFH0 output driver.

ZERO_BIAS

0 shuts down the RF PLL. This mode is used with an external RF PLL.

RF_PLL_

SHDN

0 shuts down the IF PLL. This mode is used with an external IF PLL.

IF_PLL_SHDN

FUNCTION

BIT NAME

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