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OPA320AIDBVT Datasheet(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. OPA320AIDBVT
Description  Precision, 20MHz, 0.9pA, Low-Noise, RRIO, CMOS Operational Amplifier with Shutdown
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

OPA320AIDBVT Datasheet(HTML) 13 Page - National Semiconductor (TI)

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4
3
2
1
0
1
2
3
4
-
-
-
-
-
500
1000
Time( s)
m
-
250
0
750
250
500
V
OUT
V
IN
V = 2.5V
±
S
R
S
OPA320
V+
V
IN
V
OUT
I
10mA,Max
OVERLOAD
OPA320, OPA2320
OPA320S, OPA2320S
www.ti.com
SBOS513E – AUGUST 2010 – REVISED JUNE 2013
APPLICATION INFORMATION
RAIL-TO-RAIL INPUT
OPERATING VOLTAGE
The OPA320 product family features true rail-to-rail
input operation, with supply voltages as low as ±0.9V
The OPA320 series op amps are unity-gain stable
(1.8V). The design of the OPA320 amplifiers include
and can operate on a single-supply voltage (1.8V to
an internal charge-pump that powers the amplifier
5.5V), or a split supply voltage (±0.9V to ±2.75V),
input
stage
with
an
internal
supply
rail
at
making them highly versatile and easy to use. The
approximately 1.6V above the external supply (VS+).
power-supply pins should have local bypass ceramic
This internal supply rail allows the single differential
capacitors (typically 0.001
μF to 0.1μF). The OPA320
input pair to operate and remain very linear over a
amplifiers are fully specified from +1.8V to +5.5V and
very wide input common-mode range. A unique zero-
over the extended temperature range of –40°C to
crossover input topology eliminates the input offset
+125°C. Parameters that can exhibit variance with
transition
region
typical
of
many
rail-to-rail,
regard to operating voltage or temperature are
complementary input stage operational amplifiers.
presented in the Typical Characteristics.
This topology allows the OPA320 to provide superior
common-mode
performance
(CMRR
>
110dB,
INPUT AND ESD PROTECTION
typical) over the entire common-mode input range,
The
OPA320
incorporates
internal
electrostatic
which extends 100mV beyond both power-supply
discharge (ESD) protection circuits on all pins. In the
rails.
When
driving
analog-to-digital
converters
case of input and output pins, this protection primarily
(ADCs), the highly linear VCM range of the OPA320
consists
of
current-steering
diodes
connected
assures maximum linearity and lowest distortion.
between the input and power-supply pins. These ESD
protection
diodes
also
provide
in-circuit
input
PHASE REVERSAL
overdrive protection, provided that the current is
The OPA320 op amps are designed to be immune to
limited to 10mA as stated in the Absolute Maximum
phase reversal when the input pins exceed the supply
Ratings. Many input signals are inherently current-
voltages,
therefore
providing
further
in-system
limited to less than 10mA; therefore, a limiting resistor
stability and predictability. Figure 34 shows the input
is not required. Figure 33 shows how a series input
voltage exceeding the supply voltage without any
resistor (RS) may be added to the driven input to limit
phase reversal.
the input current. The added resistor contributes
thermal noise at the amplifier input and the value
should be kept to the minimum in noise-sensitive
applications.
Figure 33. Input Current Protection
Figure 34. No Phase Reversal
Copyright © 2010–2013, Texas Instruments Incorporated
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Product Folder Links: OPA320 OPA2320 OPA320S OPA2320S


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