AS1712A-AQFT 查看數據表（PDF） - austriamicrosystems AG

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AS1712A-AQFT

High-Output-Drive, 10MHz, 10V/µs, Rail-to-Rail I/O Op Amps with Shutdown

austriamicrosystems AG 

AS1710/AS1712

Data Sheet - Application Information

Driving Capacitive Loads

The AS1710/AS1712 amplifiers have a high tolerance for capacitive loads, and are stable with capacitive loads up to

100pF.

Figure 26 shows a typical non-inverting capacitive-load driving circuit in the unity-gain configuration.

Figure 26. Capacitive-Load Driving Circuit

–

AS1710

+

RISO

CF

Note: Resistor RISO improves the circuit’s phase margin by isolating the load capacitor from the AS1710/AS1712 out-

put.

Power-Up

The AS1710/AS1712 typically settle within 5µs after power-up.

Shutdown

When SHDNN (not included in B versions) is pulled low, supply current drops to 0.5µA (per amplifier, VDD = 2.7V), the

amplifiers are disabled, and their outputs are driven to VSS. Because the outputs are actively driven to VSS in shut-

down, any pullup resistor on the output causes a current drain from the supply.

Note: Pulling SHDNN high enables the amplifier. In the AS1712 the amplifiers shutdown in pairs.

When exiting shutdown, there is a 6µs delay before the amplifier output becomes active.

Power Supplies and Layout

The AS1710/AS1712 can operate from a single 2.7 to 5.5V supply or from dual ±1.35 to ±2.5V supplies. Good design

improves device performance by decreasing the amount of stray capacitance at the op amp inputs/outputs.

! For single-supply operation, bypass the power supply with a 0.1µF ceramic capacitor.

! For dual-supply operation, bypass each supply to ground.

! Decrease stray capacitance by placing external components close to the op amp pins, minimizing trace and lead

lengths.

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