Datasheet

E/S
(2)
R
SET
(1)
47 Fm
0.1 Fm
V
O
V
IN
V-
I
SET
OPA564
47 Fm
0.1 Fm
V
DIG
(3)
V+
Voltage(V)
Time(s)
Voltage(V)
Time(s)
Voltage(V)
Time(s)
(A) Sequencenotallowed
(1)
(B) Sequenceallowed
(C) Sequenceallowed
V
SUPPLY
V
SUPPLY
V
SUPPLY
V
DIGITAL
V
DIGITAL
V
DIGITAL
SeeNote1
OPA564
SBOS372E –OCTOBER 2008– REVISED JANUARY 2011 www.ti.com
APPLICATION INFORMATION
Sequencing of power supplies must assure that the
BASIC CONFIGURATION
digital supply voltage (V
DIG
) be applied before the
supply voltage to prevent damage to the OPA564.
Figure 35 shows the OPA564 connected as a basic
Figure 36 shows acceptable versus unacceptable
noninverting amplifier. However, the OPA564 can be
power-supply sequencing.
used in virtually any op amp configuration.
Power-supply terminals should be bypassed with low
series impedance capacitors. The technique of using
ceramic and tantalum capacitors in parallel is
recommended. Power-supply wiring should have low
series impedance.
(1) R
SET
sets the current limit value from 0.4A to 1.5A.
(2) E/S pin forced low shuts down the output.
(3) V
DIG
must not exceed (V–) + 5.5V; see Figure 56 for examples
of generating a signal for V
DIG
.
Figure 35. Basic Noninverting Amplifier
POWER SUPPLIES
The OPA564 operates with excellent performance
from single (+7V to +24V) or dual (±3.5V to ±12V)
analog supplies and a digital supply of +3.3V to
+5.5V (referenced to the V– pin). Note that the
analog power-supply voltages do not need to be
symmetrical, as long as the total voltage remains
below 24V. For example, the positive supply could be
set to 14V with the negative supply at –10V. Most
behaviors remain constant across the operating
(1) The power-supply sequence illustrated in (A) is not allowed.
voltage range. Parameters that vary significantly with
This power-supply sequence causes damage to the device.
operating voltage are shown in the Typical
Characteristics.
Figure 36. Power-Supply Sequencing
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