ADMV1455BBCZ-R7 datasheet(65/141 Pages) AD

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Data Sheet

ADMV1455

THEORY OF OPERATION

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Rev. 0 | 65 of 141

CHIP OVERVIEW

The ADMV1455 is a highly integrated microwave downconverter

designed for wideband radio systems operating across a broad RF

frequency range of 17.7GHz to 55GHz. The device supports IF

outputs up to 12GHz, enabling seamless integration with modern

high-speed data converters and extending their effective frequency

coverage well into the millimeter-wave spectrum.

The chip incorporates a fully configurable architecture that includes

an I/Q mixer, a LO signal chain, two RF signal chains, an IF signal

chain, and baseband I/Q amplifiers, all of which are configurable

via a simple SPI. This level of integration minimizes the external

component count while offering maximum design flexibility.

With its compact 6mm × 6.5mm footprint, wideband capability, and

configurable signal chains, the ADMV1455 is ideally suited for next

generation, high data rate systems requiring low size, weight, and

power (SWaP) without compromising on system performance.

POWER-UP AND INITIALIZATION SEQUENCE

To power up and initialize the ADMV1455, take the following steps

and refer to the Timing Diagrams Overview section and Figure 167

for more information:

1. Ensure that all digital logic inputs are logic level low.

2. Power on all supply voltages simultaneously, with a rise time of

1ms or longer.

3. Once the supplies are stable, set RST to logic level high.

4. Program the NVM load instructions.

5. Program the necessary registers for the intended chip opera-

tion.

6. Set CEN to logic level high.

POWER-DOWN SEQUENCE

There are two possible power-down options available for the

ADMV1455. One power-down option removes all power from the

chip, and the other power-down option disables the chip, causing it

to enter a low power mode.

Full Power-Down

To fully power down the chip in an ordered fashion, take the

following steps and refer to Figure 170 for more information:

1. Set CEN to logic level low.

2. Set all other logic inputs to logic level low.

3. Power off all supply voltages.

Chip Disable with CEN

To disable the chip and enter low power mode while the supply

voltages are still powered on, bring CEN to logic level low. Bringing

CEN to logic level low causes the chip to power off most of the RF

circuits within the chip. Refer to Figure 169 for more information.

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