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PDF OPA2345 Data sheet ( Hoja de datos )
| Número de pieza | OPA2345 | |
| Descripción | LOW POWER / SINGLE-SUPPLY / RAIL-TO-RAIL OPERATIONAL AMPLIFIERS MicroAmplifier Series | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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OPA344
OPA4344
OPA345
OPA342 ®
OPA344
OPA2344
OPA4344
OPA345
OPA2345
OPA4345
LOW POWER, SINGLE-SUPPLY, RAIL-TO-RAIL
OPERATIONAL AMPLIFIERS
MicroAmplifier ™ Series
FEATURES
DESCRIPTION
q RAIL-TO-RAIL INPUT
q RAIL-TO-RAIL OUTPUT (within 1mV)
q LOW QUIESCENT CURRENT: 150µA typ
q MicroSIZE PACKAGES
SOT23-5
MSOP-8
TSSOP-14
q GAIN-BANDWIDTH
OPA344: 1MHz, G ≥ 1
OPA345: 3MHz, G ≥ 5
q SLEW RATE
OPA344: 0.8V/µs
OPA345: 2V/µs
q THD + NOISE: 0.006%
The OPA344 and OPA345 series rail-to-rail CMOS
operational amplifiers are designed for precision, low-
power, miniature applications. The OPA344 is unity
gain stable, while the OPA345 is optimized for gains
greater than or equal to five, and has a gain-bandwidth
product of 3MHz.
The OPA344 and OPA345 are optimized to operate on
a single supply from 2.5V and up to 5.5V with an input
common-mode voltage range that extends 300mV
beyond the supplies. Quiescent current is only
250µA (max).
Rail-to-rail input and output make them ideal for driving
sampling analog-to-digital converters. They are also well
suited for general purpose and audio applicaitons and
providing I/V conversion at the output of D/A converters.
Single, dual and quad versions have identical specs for
design flexibility.
APPLICATIONS
q PCMCIA CARDS
q DATA ACQUISITION
q PROCESS CONTROL
q AUDIO PROCESSING
q COMMUNICATIONS
q ACTIVE FILTERS
q TEST EQUIPMENT
OPA2344, OPA2345
A variety of packages are available. All are specified for
operation from –40ºC to 85ºC. A SPICE macromodel is
available for design analysis.
OPA344, OPA345
Out 1
V– 2
+In 3
5 V+
4 –In
SOT23-5
OPA344, OPA345
Out A 1
–In A 2
+In A 3
OPA4344, OPA4345
AD
14 Out D
13 –In D
12 +In D
Out A 1
–In A 2
+In A 3
A
B
8 V+
7 Out B
6 –In B
NC 1
–In 2
+In 3
8 NC
7 V+
6 Out
+V 4
+In B 5
–In B 6
B
11 –V
10 +In C
C
9 –In C
V– 4
5 +In B
V– 4
5 NC Out B 7
8 Out C
SO-8, MSOP-8, 8-Pin DIP (OPA2344 Only)
SO-8, 8-Pin DIP (OPA344 Only)
TSSOP-14, SO-14, 14-PIn DIP (OPA4344 Only)
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-1486A
Printed in U.S.A. April, 2000
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.
120
100
80
60
40
20
0
0.1
OPEN-LOOP GAIN/PHASE vs FREQUENCY
0
OPA344
Phase
30
60
90
Gain
120
150
180
1 10 100 1k 10k 100k 1M 10M
Frequency (Hz)
120
100
80
60
40
20
0
0.1
OPEN-LOOP GAIN/PHASE vs FREQUENCY
0
OPA345
Phase
30
60
90
Gain
120
150
180
1 10 100 1k 10k 100k 1M 10M
Frequency (Hz)
POWER SUPPLY AND COMMON-MODE
REJECTION RATIO vs FREQUENCY
100
+PSRR
80
CMRR
–PSRR
60
40
20
10
10
100 1k 10k
Frequency (Hz)
100k
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
6
VS = +5.5V
5
VS =
+5V
4
OPA344
3
OPA345
VS = +2.7V
2
1
0
100k
1M
Frequency (Hz)
10M
CHANNEL SEPARATION vs FREQUENCY
140
120
100
Dual and quad devices.
G = 1, all channels.
Quad measured channel
80 A to D or B to C—other
combinations yield improved
rejection.
60
100
1k 10k
Frequency (Hz)
100k
1M
10000
1000
100
VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
IN
VN
100
10
1
10
1
0.1
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
OPA344, 2344, 4344
®
5 OPA345, 2345, 4345
5 Page 
performance curve “Small-Signal Overshoot vs Capacitive
Load.” In unity-gain configurations, capacitive load drive
can be improved by inserting a small (10Ω to 20Ω) resistor,
RS, in series with the output, as shown in Figure 5. This
significantly reduces ringing while maintaining dc perfor-
mance for purely capacitive loads. However, if there is a
resistive load in parallel with the capacitive load, a voltage
divider is created, introducing a dc error at the output and
slightly reducing the output swing. The error introduced is
proportional to the ratio RS/RL, and is generally negligible.
V+
RS
OPA344
VOUT
VIN
10Ω to
20Ω
RL
CL
DRIVING A/D CONVERTERS
The OPA344 and OPA345 series op amps are optimized for
driving medium-speed sampling A/D converters. The
OPA344 and OPA345 op amps buffer the A/D’s input
capacitance and resulting charge injection while providing
signal gain.
Figures 6 shows the OPA344 in a basic noninverting con-
figuration driving the ADS7822. The ADS7822 is a 12-bit,
micro-power sampling converter in the MSOP-8 package.
When used with the low-power, miniature packages of the
OPA344, the combination is ideal for space-limited, low-
power applications. In this configuration, an RC network at
the A/D’s input can be used to filter charge injection.
Figure 7 shows the OPA2344 driving an ADS7822 in a
speech bandpass filtered data acquisition system. This small,
low-cost solution provides the necessary amplification and
signal conditioning to interface directly with an electret
microphone. This circuit will operate with VS = +2.7V to
+5V with less than 500µA quiescent current.
FIGURE 5. Series Resistor in Unity-Gain Configuration
Improves Capacitive Load Drive.
+5V
0.1µF
0.1µF
VIN
VIN = 0V to 5V for
0V to 5V output.
OPA344
500Ω
3300pF
8 V+
+In
2
–In
3
ADS7822
12-Bit A/D
GND 4
RC network filters high frequency noise.
FIGURE 6. OPA344 in Noninverting Configuration Driving ADS7822.
1 VREF
7
DCLOCK
DOUT
CS/SHDN
6
5
Serial
Interface
NOTE: A/D Input = 0 to VREF
R1
1.5kΩ
R2
1MΩ
C1
1000pF
Electret
Microphone(1)
R3
1MΩ
NOTE: (1) Electret microphone
powered by R1.
V+ = +2.7V to 5V
R4
20kΩ
1/2
OPA2344
R6
100kΩ
R9
510kΩ
R7
51kΩ
R8
150kΩ
C3
33pF
1/2
OPA2344
C2 1000pF
R5
20kΩ
G = 100
Passband 300Hz to 3kHz
VREF 1
8 V+
7
+IN ADS7822 6
2
–IN
12-Bit A/D 5
3
4
DCLOCK
DOUT
CS/SHDN
GND
Serial
Interface
FIGURE 7. Speech Bandpass Filtered Data Acquisition System.
11
OPA344, 2344, 4344
OPA345, 2345, 4345
®
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet OPA2345.PDF ] | |
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