ETC OPA349UA/2K5

®
OPA349
OPA2349
OPA
349
OPA
349
OPA
234
9
For most current data sheet and other product
information, visit www.burr-brown.com
1µA, Rail-to-Rail, CMOS
OPERATIONAL AMPLIFIERS
FEATURES
DESCRIPTION
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The OPA349 and OPA2349 are ultra-low power operational amplifiers that provide 70kHz bandwidth
with only 1µA quiescent current. These rail-to-rail
input and output amplifiers are specifically designed
for battery powered applications. Unlike some
micropower op amps, these parts are unity-gain stable
and require no external compensation. The OPA349’s
low input bias current allows the use of large source
and feedback resistors. The input common-mode voltage range extends 200mV beyond the power supply
rails and the output swings to within 150mV of the
rails, maintaining wide dynamic range.
LOW SUPPLY CURRENT: 1µA
GAIN-BANDWIDTH: 70kHz
UNITY GAIN STABLE
LOW INPUT BIAS CURRENT: 10pA
WIDE SUPPLY RANGE: 1.8V to 5.5V
INPUT RANGE 200mV BEYOND RAILS
OUTPUT SWINGS TO 150mV OF RAILS
OUTPUT DRIVE CURRENT: 20mA
OPEN-LOOP GAIN: 90dB
SOT23 MicroPACKAGES
APPLICATIONS
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BATTERY PACKS AND POWER SUPPLIES
PORTABLE PHONES/PAGERS/CAMERAS
SOLAR-POWERED SYSTEMS
SMOKE/GAS/FIRE DETECTION SYSTEMS
REMOTE SENSORS
PCMCIA CARDS
DRIVING A/D CONVERTERS
MicroPOWER FILTERS
OPA349 can be operated with power supplies from
1.8V to 5.5V with little change in performance, guaranteeing continuing superior performance even in low
battery situations.
OPA349 comes in the miniature SOT23-5, SO-8 surface mount and PDIP-8(1) packages. OPA2349 dual is
also available in the SOT23 (8-lead SOT23-8), as well
as the SO-8 surface mount packages. These tiny packages are ideal for use in high-density applications,
such as PCMCIA cards, battery packs and portable
instruments.
All models are specified for the commercial temperature range, 0°C to +70°C.
OPA349
OPA349
Out
1
V–
2
+In
3
5
4
V+
–In
OPA2349
NC
1
8
NC
Out A
1
8
V+
–In
2
7
V+
–In A
2
7
Out B
+In
3
6
Out
+In A
3
6
–In B
V–
4
5
NC
V–
4
5
+In B
SOT23-5
SO-8, PDIP-8(1)
SOT23-8, SO-8
NOTE: (1) Available Q4 2000.
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 2000 Burr-Brown Corporation
SBOS121
PDS-1568A
Printed in U.S.A. June, 2000
SPECIFICATIONS: VS = +1.8V to +5.5V
Boldface limits apply over the specified temperature range, TA = 0°C to +70°C
At TA = +25°C, RL = 1MΩ connected to VS /2, unless otherwise noted.
OPA349NA, UA, PA
OPA2349EA, UA
PARAMETER
CONDITION
OFFSET VOLTAGE
Input Offset Voltage
VOS
Drift
dVOS /dT
vs Power Supply
PSRR
Channel Separation, dc (Dual version)
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
INPUT BIAS CURRENT
Input Bias Current
Input Offset Current
VCM
CMRR
MIN
VS = 5V, VCM = 2.5V
(V–) – 0.2
52
48
OPEN-LOOP GAIN
Open-Loop Voltage Gain
Open-Loop Voltage Gain
en
in
AOL
OUTPUT
Voltage Output Swing from Rail
Output Current
Short-Circuit Current
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time, 0.1%
0.01%
Overload Recovery Time
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current (per amplifier)
TEMPERATURE RANGE
Specified Range
Storage Range
Thermal Resistance
SOT23-5 Surface Mount
SOT23-8 Surface Mount
SO-8 Surface Mount
PDIP-8
RL = 1MΩ, VS = +5.5V, +0.3V < VO < +5.2V
R L = 10kΩ, VS = +5.5V, +0.35V < VO < +5.15V
74
74
RL = 1MΩ, VS = +5.5V, AOL > 74dB
RL = 10kΩ, V S = +5.5V, AOL > 74dB
CL = 10pF
G = +1
VS = +5V, G = +1
VS = 5V, 1V Step
VS = 5V, 1V Step
VIN • Gain = VS
±10
350
10
1000
mV
µV/°C
µV/V
µV/V
(V+) + 0.2
V
dB
dB
±10
±10
pA
pA
72
60
1013 || 2
1013 || 4
Ω || pF
Ω || pF
8
300
4
µVp-p
nV/√Hz
fA/√Hz
90
90
dB
dB
300
350
70
0.02
65
80
5
1.8
1.8
VS
IQ
±2
150
200
±8
±25
I SC
GBW
SR
tS
UNITS
±1
±1
IB
IOS
INPUT IMPEDANCE
Differential
Common-Mode
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
MAX
±10
VS = 1.8V to 5.5V, VCM = (V–) + 0.3V
RL = 100kΩ
VS = +5V, –0.2V < VCM < 3.5V
VS = +5V, –0.2V < VCM < 5.2V
TYP
IO = 0
1
0
–65
θJA
200
200
150
100
mV
mV
mA
mA
kHz
V/µs
µs
µs
µs
5.5
5.5
2
V
V
µA
+70
+150
°C
°C
°C/W
°C/W
°C/W
°C/W
°C/W
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility
for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or
licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support
devices and/or systems.
®
OPA349
2
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
Supply Voltage, V+ to V– ................................................................... 5.5V
Signal Input Terminals, Voltage(2) .................. (V–) – 0.5V to (V+) + 0.5V
Current(2) .................................................... 10mA
Output Short Circuit(3) .............................................................. Continuous
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –65°C to +150°C
Junction Temperature ...................................................................... 150°C
Lead Temperature (soldering, 3s) ................................................... 300°C
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these, or any other conditions beyond those specified,
is not implied. (2) Input terminals are diode-clamped to the power supply
rails. Input signals that can swing more than 0.5V beyond the supply rails
should be current-limited to 10mA or less. (3) Short circuit to ground, one
amplifier per package.
PACKAGE/ORDERING INFORMATION
PRODUCT
PACKAGE
PACKAGE
DRAWING
NUMBER
Single
OPA349NA
SOT23-5
331
0°C to +70°C
A49
"
"
"
"
OPA349UA
"
OPA349UA
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER(1)
TRANSPORT
MEDIA
OPA349NA/250
OPA349NA/3K
OPA349UA
OPA349UA/2K5
OPA349PA
Tape and Reel
Tape and Reel
Rails
Tape and Reel
Rails
OPA2349EA/250
OPA2349EA/3K
OPA2349UA
OPA2349UA/2K5
Tape and Reel
Tape and Reel
Rails
Tape and Reel
SO-8
182
0°C to +70°C
"
"
"
"
"
OPA349PA(2)
PDIP-8
006
0°C to +70°C
OPA349PA
Dual
OPA2349EA
SOT23-8
348
0°C to +70°C
C49
"
"
"
"
"
OPA2349UA
SO-8
182
0°C to +70°C
OPA2349UA
"
"
"
"
"
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /3K indicates 3000 devices per reel). Ordering 3000 pieces of
“OPA2349EA/3K” will get a single 3000-piece Tape and Reel. (2) OPA349PA (DIP) available Q4 2000.
®
3
OPA349
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = 5V, unless otherwise noted.
COMMON-MODE REJECTION RATIO vs FREQUENCY
OPEN-LOOP GAIN AND PHASE vs FREQUENCY
70
100
90
0
60
80
50
60
50
90
40
30
CMRR (dB)
45
Phase (°)
Gain (dB)
70
135
40
30
20
20
10
10
180
0
0
0.1
1
10
100
1k
Frequency (Hz)
10k
100k
10
1M
90
90
80
80
Channel Separation (dB)
100
PSRR (dB)
70
60
+PSRR
–PSRR
1k
Frequency (Hz)
10k
100k
CHANNEL SEPARATION vs FREQUENCY
POWER SUPPLY REJECTION RATIO vs FREQUENCY
100
50
100
40
30
20
70
60
50
40
30
20
10
10
0
0
10
100
1k
Frequency (Hz)
10k
10
100k
100
1k
Frequency (Hz)
10k
100k
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
INPUT VOLTAGE NOISE DENSITY
400
Population
Voltage Noise (nV/√Hz)
1000
100
10
100
1k
10k
–30 –25 –20 –15 –10 –5
Frequency (Hz)
®
OPA349
0
5
10 15 20 25 30 35 40
Offset Voltage Drift
4
TYPICAL PERFORMANCE CURVES
(Cont.)
At TA = +25°C, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
OUTPUT VOLTAGE vs OUTPUT CURRENT
16
V+
0°C to +70°C
(V+)–1
12
Output Voltage (V)
Quiescent Current (µA)
14
OPA2349
(per channel)
10
8
6
4
Sourcing Current
(V+)–2
(V+)+2
Sinking Current
(V–)+1
2
0°C to +70°C
OPA349
V–
0
–75
–50
–25
0
25
50
Temperature (°C)
75
100
125
0
1
2
3
4
5
Output Current (mA)
6
7
8
LARGE-SIGNAL STEP RESPONSE
G = 1, RL = 1MΩ
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
6
VS = +5.5V
VS = +5V
1V/div
4
3
VS = +2.5V
2
VS = +1.8V
1
0
100
1k
10k
100k
100µs/div
Frequency (Hz)
SMALL-SIGNAL STEP RESPONSE
G = 1, RL = 1MΩ, CL = 500pF
50mV/div
SMALL-SIGNAL STEP RESPONSE
G = 1, RL = 1MΩ, CL = 20pF
50mV/div
Output Voltage (Vp-p)
5
100µs/div
40µs/div
®
5
OPA349
APPLICATIONS INFORMATION
value reacts with input capacitance and stray capacitance to
produce a pole in the feedback network. A feedback capacitor may be required to assure stability and limit overshoot or
gain peaking. Check circuit performance carefully to assure
that biasing and feedback techniques meet your signal and
quiescent current requirements.
OPA349 series op amps are unity gain stable and can operate
on a single supply, making them highly versatile and easy to
use. Power supply pins should be by passed with 0.01µF
ceramic capacitors.
OPA349 series op amps are fully specified and guaranteed
from +1.8V to +5.5V. Parameters that vary significantly with
operating voltages or temperature are shown in the Typical
Performance Curves.
RAIL-TO-RAIL INPUT
The input common-mode voltage range of the OPA349 series
extends 200mV beyond the supply rails. This is achieved with
a complementary input stage—an N-channel input differential pair in parallel with a P-channel differential pair (see
Figure 2). The N-channel pair is active for input voltages close
to the positive rail, typically (V+) – 1.3V to 200mV above the
positive supply, while the P-channel pair is on for inputs from
200mV below the negative supply to approximately (V+) –
1.3V. There is a small transition region, typically (V+) – 1.5V
to (V+) – 1.1V, in which both pairs are on. This 400mV
transition region can vary 300mV with process variation.
Thus, the transition region (both stages on) can range from
(V+) – 1.8V to (V+) – 1.4V on the low end, up to (V+) – 1.2V
to (V+) – 0.8V on the high end. Within the 400mV transition
region PSRR, CMRR, offset voltage, offset drift, and THD
may be degraded compared to operation outside this region.
For more information on designing with rail-to-rail input op
amps, see Figure 3 “Design Optimization with Rail-to-Rail
Input Op Amps.”
The ultra low quiescent current of the OPA349 requires
careful applications circuit techniques to achieve low overall
current consumption. Figure 1 shows an ac-coupled amplifier biased with a voltage divider. Resistor values must be
very large to minimize current. The large feedback resistor
+1.8 to 5.5V
CF
3pF
R3
2M
R1
10M
R5
10M
CF may be required
for best stability or to
reduce frequency
peaking—see text.
G = 11
10nF
OPA349
R2
10M
VOUT
R4
2M
FIGURE 1. AC-Coupled Amplifier.
V+
Reference
Current
VIN+
VIN–
VBIAS1
VBIAS2
V–
(Ground)
FIGURE 2. Simplified Schematic.
®
OPA349
6
Class AB
Control
Circuitry
VO
DESIGN OPTIMIZATION WITH RAIL-TO-RAIL INPUT OP AMPS
swing is required. A design option would be to configure
the op amp as a unity-gain inverter as shown below and
hold the noninverting input at a set common-mode voltage
outside the transition region. This can be accomplished
with a voltage divider from the supply. The voltage divider
should be designed such that the biasing point for the
noninverting input is outside the transition the region.
In most applications, operation is within the range of only
one differential pair. However, some applications can
subject the amplifier to a common-mode signal in the
transition region. Under this condition, the inherent mismatch between the two differential pairs may lead to
degradation of the CMRR and THD. The unity-gain buffer
configuration is the most problematic—it will traverse
through the transition region if a sufficiently wide input
R
R
VOUT
VIN
VCM
FIGURE 3. Design Optimization.
COMMON-MODE REJECTION
The CMRR for the OPA349 is specified in two ways so the
best match for a given application may be used. First, the
CMRR of the device in the common-mode range below the
transition region (VCM < (V+) – 1.5V) is given. This specification is the best indicator of the capability of the device when
the application requires use of one of the differential input
pairs. Second, the CMRR at VS = 5V over the entire commonmode range is specified.
is driven to the low limit (Figure 4). Similarly, loads that can
cause current to flow out of the output pin when the output
voltage is near V– can cause oscillations. The op amp will
recover to normal operation a few milliseconds after the
output is driven positively out of the rail.
Some op amp applications can produce this condition even
without a load connected to V– The integrator in Figure 4a
shows an example. Assume that the output ramps negatively, and saturates near 0V. Any negative-going step at
VIN will produce a positive output current pulse through R1
and C1. This may incite the oscillation. Diode, D1, prevents
the input step from pulling output current when the output is
saturated at the rail, thus preventing the oscillation.
RAIL-TO-RAIL OUTPUT
A class AB output stage with common-source transistors is
used to achieve rail-to-rail output.
Loads that connect to single supply ground (or the V- supply
pin) can cause the op amp to oscillate if the output voltage
a)
V+
b)
V+
R1
1M
C1
1nF
VIN
2V
VO
OPA349
VIN
0V
D1
1N4148
OPA349
(No Load)
0V
RL
1V
0V
FIGURE 4. Output Driven to Negative Rail.
®
7
OPA349
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright  2000, Texas Instruments Incorporated