ALD1712A ALD [Advanced Linear Devices], ALD1712A Datasheet - Page 4

• Manufacturer Part Number: ALD1712A
• Description: RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
• Manufacturer: ALD [Advanced Linear Devices]

Design & Operating Notes:
1. The ALD1712 CMOS operational amplifier uses a 3 gain stage
2. The ALD1712 has complementary p-channel and n-channel input
ALD1712A/ALD1712B
ALD1712
architecture and an improved frequency compensation scheme to
achieve large voltage gain, high output driving capability, and better
frequency stability. In a conventional CMOS operational amplifier
design, compensation is achieved with a pole splitting capacitor
together with a nulling resistor. This method is, however, very bias
dependent and thus cannot accommodate the large range of supply
voltage operation as is required from a stand alone CMOS operational
amplifier. The ALD1712 is internally compensated for unity gain
stability using a novel scheme that does not use a nulling resistor. This
scheme 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 ALD1712 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
ALD1712 has shown itself to be more resistant to parasitic oscilla-
tions.
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 compat-
ibility 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 1712 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 2.5 (5V operation),
where the common mode voltage does not make excursions below
this switching point. The user should however, be aware that this
1000
0.01
100
1.0
0.1
10
7
6
5
4
3
2
1
0
-50
COMMON MODE INPUT VOLTAGE RANGE
0
AS A FUNCTION OF SUPPLY VOLTAGE
INPUT BIAS CURRENT AS A FUNCTION
-25
V
T
OF AMBIENT TEMPERATURE
1
S
A
= 2.5V
= 25 C
AMBIENT TEMPERATURE ( C)
0
SUPPLY VOLTAGE (V)
2
25
3
50
4
TYPICAL PERFORMANCE CHARACTERISTICS
75
5
100
6
125
7
Advanced Linear Devices
3. The input bias and offset currents are essentially input protection
4. The output stage consists of class AB complementary output drivers,
5. The ALD1712 operational amplifier has been designed to provide full
switching does take place if the operational amplifier is connected as
a unity gain buffer and should make provision in his design to allow for
input offset voltage variations.
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. Normally, this extremely high input impedance of greater
than 10
limit the node impedance. However, for applications where source
impedance is very high, it may be necessary to limit noise and hum
pickup through proper shielding.
capable of driving a low resistance load. 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 an effective analog signal buffer for medium to high source
impedance sensors, transducers, and other circuit networks.
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.
1000
100
10
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
1
5
4
3
2
1
0
OF SUPPLY VOLTAGE AND TEMPERATURE
0
0
12
SUPPLY CURRENT AS A FUNCTION
would not be a problem as the source impedance would
T
A
= -55 C
+125 C
1
+25 C
+80 C
-25 C
OF SUPPLY VOLTAGE
2
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
2
INPUTS GROUNDED
OUTPUT UNLOADED
3
4
4
}
}
R
R
}
6
L
L
-55 C
+25 C
+125 C
= 10K
= 5K
5
6
4