EDGE4707B Просмотр технического описания (PDF) - Semtech Corporation

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EDGE4707B

Quad Channel Per-Pin Precision Measurement Unit

Semtech Corporation 

TEST AND MEASUREMENT PRODUCTS

Circuit Description (continued)

Short Circuit Protection

The Edge 4707B is designed to survive a direct short circuit

to any legal voltage at the FORCE and SENSE pins, by

virtue of a limited current, which results from the presence

of an external current sense resistor (normally 1 KΩ to

1MΩ) in the FORCE path.

Transient Clamps

The Edge 4707B has on-board clamps to limit the voltage

and current spikes that might result from either changing

the current range or changing the operating mode.

Power Supply Sequencing

In order to avoid the possibility of latch-up, the following

power-up requirements must be satisified:

1. VEE ≤ GND ≤ VDD ≤ VCC at all times

2. VEE ≤ All inputs ≤ VCC

The following power supply sequencing can be used as a

guideline when operating the Edge4707:

Power Up Sequence

1. VCC (substrate)

2. VEE/VDD

3. Digital Inputs

4. Analog Inputs

Power Down Sequence

1. Analog Inputs

2. Digital Inputs

3. VEE/VDD

4. VCC (substrate)

Edge4707B

Revision 3 / December 18, 2002

11

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