MAX2369EGM+TD【PDF 12/16 页】IC TRANSMITTER QUAD 48QFN-EP

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Table 3. Operation Control Register (OPCTRL)

Complete Dual-Band

Quadrature Transmitter

12 ______________________________________________________________________________________

BIT

LOCATION

(0 = LSB)

0 shuts down everything except serial interface, and also resets all registers to

power-up state.

SHDN_BIT

0 shuts down modulator and upconverter, leaving PLL locked and registers

active. This is the programmable equivalent to the TXGATE pin.

TXSTBY

0 shuts down everything except registers and serial interface.

STBY

0 selects direct VCO modulation. (IF VCO is externally modulated and the I/Q

modulator is bypassed); 1 selects quadrature modulation.

MOD_TYPE

8, 7, 6

12, 11

0 turns IFLO buffer off; 1 turns IFLO buffer on.

Set to 0 for normal operation.

UNUSED

Set to 0 for normal operation.

UNUSED

3-bit IF gain control. Alters IF gain by approximately 2dB per LSB (0 to 14dB).

Provides a means for adjusting balance between RF and IF gain for optimized

linearity.

100

IFG

When this register is 1, the upper sideband is selected (LO below RF). When

this register is 0, the lower sideband is selected (LO above RF).

SIDE_BAND

Sets operating mode according to the following:

00 = FM mode

01 = Cellular digital mode; RFL is selected

10 = Not used

11 = PCS mode; RFH is selected

MODE

1 keeps IF turbo-mode current active even when frequency acquisition is

achieved. This mode is used when high operating IF charge-pump current is

needed.

ICP_MAX

Set to 0 for normal operation.

UNUSED

1 selects LOL input port; 0 selects LOH port.

LO_SEL

FUNCTION

POWER-UP

STATE

BIT NAME

BUF_EN

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