Datasheet

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ADDITIONAL RECOMMENDATIONS

ADS1000

SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007

stabilized; this momentary spike can damage the

ADS1000. Sometimes this damage is incremental

The ADS1000 is fabricated in a small-geometry

and results in slow, long-term failure — which can be

low-voltage process. The analog inputs feature

distastrous for permanently installed, low-

protection diodes to the supply rails. However, the

maintenance systems.

current-handling ability of these diodes is limited, and

the ADS1000 can be permanently damaged by If using an op amp or other front-end circuitry with the

analog input voltages that remain more than ADS1000, be sure to take the performance

approximately 300mV beyond the rails for extended characteristics of this circuitry into account; a chain is

periods. One way to protect against overvoltage is to only as strong as its weakest link.

place current-limiting resistors on the input lines. The

Any data converter is only as good as its reference.

ADS1000 analog inputs can withstand momentary

For the ADS1000, the reference is the power supply,

currents of as large as 10mA.

and the power supply must be clean enough to

The previous paragraph does not apply to the I

C achieve the desired performance. If a power-supply

ports, which can both be driven to 6V regardless of filter capacitor is used, it should be placed close to

the supply. the V

pin, with no vias placed between the

capacitor and the pin. The trace leading to the pin

If the ADS1000 is driven by an op amp with high

should be as wide as possible, even if it must be

voltage supplies, such as ± 12V, protection should be

necked down at the device.

provided, even if the op amp is configured so that it

will not output out-of-range voltages. Many op amps

seek to one of the supply rails immediately when

power is applied, usually before the input has

Product Folder Link(s): ADS1000