MAX2150ETI+T【PDF 12/15 页】IC MODULATOR I/Q WIDE 28TQFN

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Wideband I/Q Modulator with Sigma-Delta

Fractional-N Synthesizer

Table 6. Control Register

BIT ID

BIT

NAME

PWR-UP

STATE

BIT LOCATION

0 = LSB

FUNCTION

A logic high doubles the charge pump current selected through registers

CPX

CP_MULT

1

0

CP1 and CP0. Logic low sets the charge-pump current to the value

selected by registers CP1 and CP0.

XX

BE

TE

PD

INT

XX

BUFEN

TXEN

PWDN

INT_MODE

XX

1

1

0

0

1

2

3

4

5

Unused.

High enables the VCO buffer. Low disables this output.

Low enables SW_MUTE mode, which shuts down the RF circuits while

leaving the 3-wire interface, register, and PLL circuits active.

Low enables register-based shutdown. This mode shuts down all circuits

except the 3-wire interface and internal registers.

Logic high disables the sigma-delta modulator. Logic low enables the

sigma-delta modulator for normal operation.

Table 7. Device Modes

MODE

HW PINS

SOFTWARE CONTROL

BITS

DESCRIPTION

SHDN

TXEN

SYNEN

BUFEN

PWDN

TXEN BUFEN

TX

H

H

H

H/L

H

H

H/L

All circuits active.

Modulator circuits active. Synthesizer

MOD

H

H

L

H/L

H

H

H/L

blocks disabled. Mode is used with external

PLL circuit.

Serial interface and synthesizer blocks

SYNTH

H

L

H

H/L

H

X

H/L

active. RF and modulator blocks disabled.

Mode is used to gate RF ON/OFF with

external logic control.

Serial interface and synthesizer blocks all

SW_MUTE

H

H

H

H/L

H

L

H/L

active. Modulator blocks disabled. Mode is

used to gate RF ON/OFF with software

control.

HW_SHDN

L

X

X

X

X

X

X

All circuits disabled. Lowest current mode

of operation.

Serial interface and registers active, all

SW_SHDN

H

X

X

X

L

X

X

other circuits inactive regardless of the

state of the HW pins with the exception of

HW_SHDN.

Power-Supply (V CC ) Bypassing

Proper voltage-supply bypassing is essential to reduce

the spurious emissions mentioned above. It is recom-

mended that each V CC pin be bypassed independently

and share no common vias with any other ground con-

nection. See the Typical Operating Circuit for suggest-

ed bypass component values.

12

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