AD7298-1BCPZ-RL 데이터 시트보기 (PDF) - Analog Devices

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AD7298-1BCPZ-RL

8-Channel, 1 MSPS, 10-Bit SAR ADC

Analog Devices 

POWERING UP THE AD7298-1

The AD7298-1 contains a power-on reset circuit that sets the

control register to its default setting of all zeros; therefore, the

internal reference is enabled and the device is configured for the

normal mode of operation. At power-up, the internal reference is

by default enabled, which takes up to 6 ms (maximum) to power up.

If an external reference is being used, the user does not need to

wait for the internal reference to power up fully. The AD7298-1

digital interface is fully functional after 500 µs from the initial

power-up. Therefore, the user can write to the control register

after 500 µs to switch to external reference mode. The AD7298-1 is

then immediately ready to convert once the external reference is

available on the VREF pin.

When supplies are first applied to the AD7298-1, the user must

wait the specified 500 µs before programming the control register

to select the desired channels for conversion.

AD7298-1

RESET

The AD7298-1 includes a reset feature that can be used to reset

the device and the contents of all internal registers, including

the control register, to their default state.

To activate the reset operation, the PD/RST pin should be brought

low for no longer than 100 ns. It is asynchronous with the clock;

therefore, it can be triggered at any time. If the PD/RST pin is

held low for greater than 100 ns, the part enters full power-down

mode. It is imperative that the PD/RST pin be held at a stable

logic level at all times to ensure normal operation.

Rev. A | Page 19 of 24

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