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ALD1704BSA

RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER

Advanced Linear Devices 

Design & Operating Notes:

1. The ALD1704A/ALD1704B/ALD1704/ALD1704G CMOS operational

amplifier uses a 3 gain stage architecture and an improved frequency

compensation scheme to achieve large voltage gain, high output

driving capability, and better frequency stability. The ALD1704A/

ALD1704B/ALD1704/ALD1704G is internally compensated for unity

gain stability using a novel scheme that produces a clean single pole

roll off in the gain characteristics while providing for more than 70

degrees of phase margin at the unity gain frequency. A unity gain buffer

using the ALD1704A/ALD1704B/ALD1704/ALD1704G will typically

drive 400pF of external load capacitance without stability problems. In

the inverting unity gain configuration, it can drive up to 800pF of load

capacitance. Compared to other CMOS operational amplifiers, the

ALD1704A/ALD1704B/ALD1704/ALD1704G has shown itself to be

more resistant to parasitic oscillations.

2. The ALD1704A/ALD1704B/ALD1704/ALD1704G has complementary

p-channel and n-channel input differential stages connected in parallel

to accomplish rail to rail input common mode voltage range. This

means that with the ranges of common mode input voltage close to the

power supplies, one of the two differential stages is switched off

internally. To maintain compatibility with other operational amplifiers,

this switching point has been selected to be about 1.5V above the

negative supply voltage. Since offset voltage trimming on the ALD1704A/

ALD1704B/ALD1704/ALD1704G is made when the input voltage is

symmetrical to the supply voltages, this internal switching does not

affect a large variety of applications such as an inverting amplifier or

non-inverting amplifier with a gain larger than 2 (10V operation), where

the common mode voltage does not make excursions below this

switching point.

3. The input bias and offset currents are essentially input protection diode

reverse bias leakage currents, and are typically less than 1pA at room

temperature. This low input bias current assures that the analog signal

from the source will not be distorted by input bias currents. For

applications where source impedance is very high, it may be necessary

to limit noise and hum pickup through proper shielding.

4. The output stage consists of symmetrical class AB complementary

output drivers, capable of driving a low resistance load with up to 10mA

source current and 10mA sink current. The output voltage swing is

limited by the drain to source on-resistance of the output transistors as

determined by the bias circuitry, and the value of the load resistor.

When connected in the voltage follower configuration, the oscillation

resistant feature, combined with the rail-to-rail input and output feature,

makes the ALD1704A/ALD1704B/ALD1704/ALD1704G an effective

analog signal buffer for medium to high source impedance sensors,

transducers, and other circuit networks.

5. The ALD1704A/ALD1704B/ALD1704/ALD1704G operational ampli-

fier has been designed to provide full static discharge protection.

Internally, the design has been carefully implemented to minimize latch

up. However, care must be exercised when handling the device to

avoid strong static fields that may degrade a diode junction, causing

increased input leakage currents. In using the operational amplifier, the

user is advised to power up the circuit before, or simultaneously with,

any input voltages applied and to limit input voltages to not exceed 0.3V

of the power supply voltage levels.

TYPICAL PERFORMANCE CHARACTERISTICS

COMMON MODE INPUT VOLTAGE RANGE

AS A FUNCTION OF SUPPLY VOLTAGE

±7

TA = 25°C

±6

±5

±4

±3

±2

±2

±3

±4

±5

±6

±7

SUPPLY VOLTAGE (V)

OPEN LOOP VOLTAGE GAIN AS A FUNCTION

OF SUPPLY VOLTAGE AND TEMPERATURE

1000

} -55°C

} +25°C

100

} +125°C

10

1

0

RL= 10KΩ

RL= 5KΩ

±2

±4

±6

±8

SUPPLY VOLTAGE (V)

INPUT BIAS CURRENT AS A FUNCTION

OF AMBIENT TEMPERATURE

10000

1000

VS = ±5.0V

100

10

1.0

0.1

-50 -25

0

25 50 75 100 125

AMBIENT TEMPERATURE (°C)

SUPPLY CURRENT AS A FUNCTION

OF SUPPLY VOLTAGE

5

INPUTS GROUNDED

OUTPUT UNLOADED

4

3

2

TA = -55°C

-25°C

+25°C

1

+80°C

+125°C

0

0

±1

±2

±3

±4

±5

±6

SUPPLY VOLTAGE (V)

ALD1704A/ALD1704B

ALD1704/ALD1704G

Advanced Linear Devices

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