AD1994 datasheet(19/24 Pages) AD

19 / 24 page

AD1994

Rev. 0 | Page 19 of 24

Clocking Multiple Amplifiers in Parallel

If there are multiple AD199x family amplifiers connected to the

same PVDD supply, use the same clock source (or synchronous

derivatives) for each amplifier as previously described. Avoid

clocking amplifiers from similar but asynchronous clocks if

they use the same power supply because this can result in beat

frequencies.

PROTECTION CIRCUITS AND ERROR REPORTING

Thermal Protection

The AD1994 features thermal protection. When the die

temperature exceeds approximately 135°C, the thermal warning

error output (ERR1) is asserted. If the die temperature exceeds

approximately 150°C, the thermal shutdown error output

(ERR2) is asserted. If this occurs, the part shuts down to

prevent damage to the part. When the die temperature drops

below approximately 120°C, the part returns to normal

operation automatically and negates both error outputs.

Overcurrent Protection

The AD1994 features over current or short-circuit protection. If

the current through any power transistors exceeds approximately

4 A, the part enters a mute state and the overcurrent error

output (ERR0) is asserted. This is a latched error and does not

clear automatically. Restore normal operation and clear the

error condition by either asserting and then negating RESET or

by asserting and then negating MUTE.

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