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OPA2349 Schematic ( PDF Datasheet ) - Burr-Brown

Teilenummer OPA2349
Beschreibung 1mA / Rail-to-Rail / CMOS OPERATIONAL AMPLIFIERS
Hersteller Burr-Brown
Logo Burr-Brown Logo 




Gesamt 7 Seiten
OPA2349 Datasheet, Funktion
®
OPA349
OPA349
OPA2349
OPA349
OPA2349
For most current data sheet and other product
information, visit www.burr-brown.com
1µA, Rail-to-Rail, CMOS
OPERATIONAL AMPLIFIERS
FEATURES
q LOW SUPPLY CURRENT: 1µA
q GAIN-BANDWIDTH: 70kHz
q UNITY GAIN STABLE
q LOW INPUT BIAS CURRENT: 10pA
q WIDE SUPPLY RANGE: 1.8V to 5.5V
q INPUT RANGE 200mV BEYOND RAILS
q OUTPUT SWINGS TO 150mV OF RAILS
q OUTPUT DRIVE CURRENT: 20mA
q OPEN-LOOP GAIN: 90dB
q SOT23 MicroPACKAGES
APPLICATIONS
q BATTERY PACKS AND POWER SUPPLIES
q PORTABLE PHONES/PAGERS/CAMERAS
q SOLAR-POWERED SYSTEMS
q SMOKE/GAS/FIRE DETECTION SYSTEMS
q REMOTE SENSORS
q PCMCIA CARDS
q DRIVING A/D CONVERTERS
q MicroPOWER FILTERS
DESCRIPTION
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.
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.
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.
Out 1
V– 2
+In 3
OPA349
5 V+
4 –In
SOT23-5
NC 1
–In 2
+In 3
V– 4
OPA349
8 NC
7 V+
6 Out
5 NC
SO-8, PDIP-8(1)
NOTE: (1) Available Q4 2000.
Out A 1
–In A 2
+In A 3
V– 4
OPA2349
8 V+
7 Out B
6 –In B
5 +In B
SOT23-8, SO-8
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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






OPA2349 Datasheet, Funktion
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.
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
R1
10M
R3
2M
CF
3pF
R5
10M
CF may be required
for best stability or to
reduce frequency
peaking—see text.
10nF
OPA349
G = 11
VOUT
R2
10M
R4
2M
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.
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
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.”
FIGURE 1. AC-Coupled Amplifier.
V+
Reference
Current
VIN+
VIN
VBIAS1
VBIAS2
Class AB
Control
Circuitry
VO
V–
(Ground)
FIGURE 2. Simplified Schematic.
®
OPA349
6

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