OPA349UA [BB]
1mA, Rail-to-Rail, CMOS OPERATIONAL AMPLIFIERS; 1mA时，轨至轨CMOS运算放大器
| 型号： | OPA349UA |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | 1mA, Rail-to-Rail, CMOS OPERATIONAL AMPLIFIERS |
| 文件： | 总7页 (文件大小：144K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
OPA349
OPA349
OPA349
OPA2349
OPA2349
For most current data sheet and other product
information, visit www.burr-brown.com
1µA, Rail-to-Rail, CMOS
OPERATIONAL AMPLIFIERS
DESCRIPTION
FEATURES
The OPA349 and OPA2349 are ultra-low power op-
erational 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 volt-
age 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
OPA349 can be operated with power supplies from
1.8V to 5.5V with little change in performance, guar-
anteeing continuing superior performance even in low
battery situations.
APPLICATIONS
● 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 comes in the miniature SOT23-5, SO-8 sur-
face 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 pack-
ages are ideal for use in high-density applications,
such as PCMCIA cards, battery packs and portable
instruments.
All models are specified for the commercial tempera-
ture range, 0°C to +70°C.
OPA349
OPA2349
OPA349
NC
V+
V+
NC
–In
+In
V–
1
2
3
4
8
7
6
5
Out A
–In A
+In A
V–
1
2
3
4
8
7
6
5
Out
V–
1
2
3
5
4
V+
Out B
–In B
+In B
Out
NC
+In
–In
SOT23-5
SO-8, PDIP-8(1)
NOTE: (1) Available Q4 2000.
SOT23-8, SO-8
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
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
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE
Input Offset Voltage
Drift
vs Power Supply
Channel Separation, dc (Dual version)
VOS
dVOS /dT
PSRR
VS = 5V, VCM = 2.5V
±2
±10
350
10
±10
mV
µV/°C
µV/V
µV/V
VS = 1.8V to 5.5V, VCM = (V–) + 0.3V
1000
RL = 100kΩ
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
VCM
CMRR
(V–) – 0.2
(V+) + 0.2
V
dB
dB
VS = +5V, –0.2V < VCM < 3.5V
VS = +5V, –0.2V < VCM < 5.2V
52
48
72
60
INPUT BIAS CURRENT
Input Bias Current
Input Offset Current
IB
IOS
±1
±1
±10
±10
pA
pA
INPUT IMPEDANCE
Differential
Common-Mode
1013 || 2
1013 || 4
Ω || pF
Ω || pF
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
8
300
4
µVp-p
nV/√Hz
fA/√Hz
en
in
OPEN-LOOP GAIN
Open-Loop Voltage Gain
Open-Loop Voltage Gain
RL = 1MΩ, VS = +5.5V, +0.3V < VO < +5.2V
AOL RL = 10kΩ, VS = +5.5V, +0.35V < VO < +5.15V
74
74
90
90
dB
dB
OUTPUT
Voltage Output Swing from Rail
RL = 1MΩ, VS = +5.5V, AOL > 74dB
RL = 10kΩ, VS = +5.5V, AOL > 74dB
150
200
±8
300
350
mV
mV
mA
mA
Output Current
Short-Circuit Current
ISC
±25
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time, 0.1%
0.01%
CL = 10pF
G = +1
VS = +5V, G = +1
VS = 5V, 1V Step
VS = 5V, 1V Step
VIN • Gain = VS
GBW
SR
tS
70
0.02
65
80
5
kHz
V/µs
µs
µs
µs
Overload Recovery Time
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current (per amplifier)
VS
IQ
1.8
1.8
5.5
5.5
2
V
V
µA
IO = 0
1
TEMPERATURE RANGE
Specified Range
0
+70
°C
Storage Range
–65
+150
°C
Thermal Resistance
SOT23-5 Surface Mount
SOT23-8 Surface Mount
SO-8 Surface Mount
PDIP-8
θJA
°C/W
°C/W
°C/W
°C/W
°C/W
200
200
150
100
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.
®
2
OPA349
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
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.
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
ESD damage can range from subtle performance degrada-
tion 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 de-
grade device reliability. These are stress ratings only, and functional opera-
tion 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
PACKAGE
DRAWING
NUMBER
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER(1)
TRANSPORT
MEDIA
PRODUCT
PACKAGE
Single
OPA349NA
SOT23-5
331
"
0°C to +70°C
A49
"
OPA349NA/250
OPA349NA/3K
OPA349UA
OPA349UA/2K5
OPA349PA
Tape and Reel
Tape and Reel
Rails
Tape and Reel
Rails
"
"
SO-8
"
"
OPA349UA
"
182
"
0°C to +70°C
"
OPA349UA
"
OPA349PA(2)
PDIP-8
006
0°C to +70°C
OPA349PA
Dual
OPA2349EA
SOT23-8
348
"
182
"
0°C to +70°C
C49
"
OPA2349UA
OPA2349EA/250
OPA2349EA/3K
OPA2349UA
Tape and Reel
Tape and Reel
Rails
"
"
SO-8
"
"
OPA2349UA
0°C to +70°C
"
"
"
OPA2349UA/2K5
Tape and Reel
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
100
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
0
45
90
135
180
10
100
1k
10k
100k
0.1
10
10
1
10
100
1k
10k
100k
1M
Frequency (Hz)
Frequency (Hz)
POWER SUPPLY REJECTION RATIO vs FREQUENCY
CHANNEL SEPARATION vs FREQUENCY
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
+PSRR
–PSRR
100
1k
Frequency (Hz)
10k
100k
10
100
1k
10k
100k
Frequency (Hz)
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
INPUT VOLTAGE NOISE DENSITY
1000
400
100
100
1k
10k
–30 –25 –20 –15 –10 –5
0
5
10 15 20 25 30 35 40
Frequency (Hz)
Offset Voltage Drift
®
4
OPA349
TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
OUTPUT VOLTAGE vs OUTPUT CURRENT
16
14
12
10
8
V+
(V+)–1
(V+)–2
(V+)+2
(V–)+1
V–
0°C to +70°C
Sourcing Current
OPA2349
(per channel)
6
Sinking Current
4
2
0°C to +70°C
OPA349
0
–75
–50
–25
0
25
50
75
100
125
0
1
2
3
4
5
6
7
8
Temperature (°C)
Output Current (mA)
LARGE-SIGNAL STEP RESPONSE
G = 1, RL = 1MΩ
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
VS = +5.5V
6
5
4
3
2
1
0
VS = +5V
VS = +2.5V
VS = +1.8V
100
1k
10k
100k
100µs/div
Frequency (Hz)
SMALL-SIGNAL STEP RESPONSE
SMALL-SIGNAL STEP RESPONSE
G = 1, RL = 1MΩ, CL = 500pF
G = 1, RL = 1MΩ, CL = 20pF
100µs/div
40µs/div
®
5
OPA349
value reacts with input capacitance and stray capacitance to
produce a pole in the feedback network. A feedback capaci-
tor 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.
APPLICATIONS INFORMATION
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 differen-
tial pair in parallel with a P-channel differential pair (see
Figure2).TheN-channelpairisactiveforinputvoltagesclose
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 ampli-
fier biased with a voltage divider. Resistor values must be
very large to minimize current. The large feedback resistor
+1.8 to 5.5V
CF
C
may be required
3pF
F
for best stability or to
reduce frequency
peaking—see text.
R1
10M
R3
2M
R5
10M
G = 11
VOUT
10nF
OPA349
R2
R4
10M
2M
FIGURE 1. AC-Coupled Amplifier.
V+
Reference
Current
VIN+
VIN–
VBIAS1
Class AB
Control
VO
Circuitry
VBIAS2
V–
(Ground)
FIGURE 2. Simplified Schematic.
®
6
OPA349
DESIGN OPTIMIZATION WITH RAIL-TO-RAIL INPUT OP AMPS
In most applications, operation is within the range of only
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.
one differential pair. However, some applications can
subject the amplifier to a common-mode signal in the
transition region. Under this condition, the inherent mis-
match 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
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.
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 specifi-
cation 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 common-
mode range is specified.
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 nega-
tively, 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
V+
a)
b)
R1
C1
V+
1M
1nF
VIN
0V
D1
1N4148
2V
0V
VO
OPA349
OPA349
(No Load)
VIN
RL
1V
0V
FIGURE 4. Output Driven to Negative Rail.
®
7
OPA349
相关型号：
OPA349UA/2K5
Single, 5.5-V, 70-kHz, low quiescent current (1-μA), RRIO operational amplifier | D | 8 | -40 to 85
TI
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