OPA4340 [BB]

SINGLE-SUPPLY, RAIL-TO-RAIL OPERATIONAL AMPLIFIERS MicroAmplifier TM Series; 单电源轨至轨运算放大器MicroAmplifier TM系列
OPA4340
型号: OPA4340
厂家: BURR-BROWN CORPORATION    BURR-BROWN CORPORATION
描述:

SINGLE-SUPPLY, RAIL-TO-RAIL OPERATIONAL AMPLIFIERS MicroAmplifier TM Series
单电源轨至轨运算放大器MicroAmplifier TM系列

运算放大器
文件: 总20页 (文件大小:709K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
®
OPA340  
OPA2340  
OPA4340  
OPA4340  
OPA340  
OPA2340  
OPA4340  
SINGLE-SUPPLY, RAIL-TO-RAIL  
OPERATIONAL AMPLIFIERS  
MicroAmplifier Series  
APPLICATIONS  
FEATURES  
DRIVING A/D CONVERTERS  
RAIL-TO-RAIL INPUT  
PCMCIA CARDS  
RAIL-TO-RAIL OUTPUT (within 1mV)  
MicroSIZE PACKAGES  
DATA ACQUISITION  
PROCESS CONTROL  
AUDIO PROCESSING  
COMMUNICATIONS  
ACTIVE FILTERS  
WIDE BANDWIDTH: 5.5MHz  
HIGH SLEW RATE: 6V/µs  
LOW THD+NOISE: 0.0007% (f = 1kHz)  
LOW QUIESCENT CURRENT: 750µA/channel  
SINGLE, DUAL, AND QUAD  
TEST EQUIPMENT  
of the supply rails with a 100kload. They offer excel-  
lent dynamic response (BW = 5.5MHz, SR = 6V/µs), yet  
quiescent current is only 750µA. Dual and quad designs  
feature completely independent circuitry for lowest  
crosstalk and freedom from interaction.  
DESCRIPTION  
OPA340 series rail-to-rail CMOS operational amplifi-  
ers are optimized for low voltage, single supply opera-  
tion. Rail-to-rail input/output and high speed operation  
make them ideal for driving sampling analog-to-digital  
converters. They are also well suited for general pur-  
pose and audio applications as well as providing I/V  
conversion at the output of D/A converters. Single,  
dual, and quad versions have identical specifications  
for design flexibility.  
The single (OPA340) packages are the tiny 5-lead  
SOT-23-5 surface mount, SO-8 surface mount, and  
8-pin DIP. The dual (OPA2340) comes in the minia-  
ture MSOP-8 surface mount, SO-8 surface mount,  
and 8-pin DIP packages. The quad (OPA4340) pack-  
ages are the space-saving SSOP-16 surface mount,  
SO-14 surface mount, and the 14-pin DIP. All are  
specified from –40°C to +85°C and operate from  
–55°C to +125°C. A SPICE macromodel is available  
for design analysis.  
The OPA340 series operates on a single supply as low as  
2.5V with an input common-mode voltage range that  
extends 500mV below ground and 500mV above the  
positive supply. Output voltage swing is to within 1mV  
OPA340  
OPA4340  
NC  
NC  
–In  
+In  
V–  
1
2
3
4
8
7
6
5
Out A  
–In A  
+In A  
+V  
1
2
3
4
5
6
7
8
16 Out D  
15 –In D  
14 +In D  
13 –V  
V+  
Output  
NC  
A
B
D
C
OPA2340  
OPA340  
8-Pin DIP, SO-8  
Out A  
1
2
3
4
8
7
6
5
V+  
+In B  
–In B  
Out B  
NC  
12 +In C  
11 –In C  
10 Out C  
A
–In A  
+In A  
V–  
Out B  
–In B  
+In B  
Out  
V–  
1
2
3
5
4
V+  
B
+In  
–In  
9
NC  
8-Pin DIP, SO-8, MSOP-8  
SOT-23-5  
SSOP-16  
Tel: (520) 746-1111  
Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132  
International Airport Industrial Park  
Mailing Address: PO Box 11400, Tucson, AZ 85734  
FAXLine: (800) 548-6133 (US/Canada Only)  
Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706  
• Twx: 910-952-1111  
Internet: http://www.burr-brown.com/  
© 1997 Burr-Brown Corporation  
PDS-1404C  
Printed in U.S.A. December, 1997  
SBOS073  
SPECIFICATIONS: VS = 2.7V to 5V  
At TA = +25°C, RL = 10kconnected to VS/2 and VOUT = VS/2, unless otherwise noted.  
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. VS = 5V.  
OPA340NA, PA, UA  
OPA2340EA, PA, UA  
OPA4340EA, PA, UA  
PARAMETER  
CONDITION  
MIN  
TYP(1)  
MAX  
UNITS  
OFFSET VOLTAGE  
Input Offset Voltage  
vs Temperature  
VOS  
dVOS/dT  
PSRR  
VS = 5V  
±150  
±2.5  
30  
±500  
µV  
µV/°C  
µV/V  
µV/V  
µV/V  
vs Power Supply  
VS = 2.7V to 5.5V, VCM = 0V  
VS = 2.7V to 5.5V, VCM = 0V  
120  
120  
T
A = –40°C to +85°C  
Channel Separation, dc  
0.2  
INPUT BIAS CURRENT  
Input Bias Current  
IB  
±0.2  
±0.2  
±10  
±60  
±10  
pA  
pA  
pA  
T
A = –40°C to +85°C  
Input Offset Current  
IOS  
NOISE  
Input Voltage Noise, f = 0.1 to 50kHz  
Input Voltage Noise Density, f = 1kHz  
Current Noise Density, f = 1kHz  
8
25  
3
µVrms  
nV/Hz  
fA/Hz  
en  
in  
INPUT VOLTAGE RANGE  
Common-Mode Voltage Range  
Common-Mode Rejection Ratio  
VCM  
CMRR  
–0.3  
80  
70  
(V+) +0.3  
V
–0.3V < VCM < (V+) –1.8V  
VS = 5V, –0.3V < VCM < 5.3V  
VS = 2.7V, –0.3V < VCM < 3V  
92  
84  
80  
dB  
dB  
dB  
66  
INPUT IMPEDANCE  
Differential  
Common-Mode  
1013 || 3  
1013 || 6  
|| pF  
|| pF  
OPEN-LOOP GAIN  
Open-Loop Voltage Gain  
AOL  
RL = 100k, 5mV < VO < (V+) –5mV  
RL = 100k, 5mV < VO < (V+) –5mV  
RL = 10k, 50mV < VO < (V+) –50mV  
RL = 10k, 50mV < VO < (V+) –50mV  
RL = 2k, 200mV < VO < (V+) –200mV  
RL = 2k, 200mV < VO < (V+) –200mV  
106  
106  
100  
100  
94  
124  
120  
114  
dB  
dB  
dB  
dB  
dB  
dB  
TA = –40°C to +85°C  
TA = –40°C to +85°C  
TA = –40°C to +85°C  
94  
FREQUENCY RESPONSE  
Gain-Bandwidth Product  
Slew Rate  
Settling Time, 0.1%  
0.01%  
GBW  
SR  
G = 1  
5.5  
6
1
1.6  
0.2  
0.0007  
MHz  
V/µs  
µs  
µs  
µs  
VS = 5V, G = 1, CL = 100pF  
VS = 5V, 2V Step, CL = 100pF  
VS = 5V, 2V Step, CL = 100pF  
VIN • G = VS  
Overload Recovery Time  
Total Harmonic Distortion + Noise  
THD+N  
VS = 5V, VO = 3Vp-p(2), G = 1, f = 1kHz  
%
OUTPUT  
Voltage Output Swing from Rail(3)  
RL = 100k, AOL 106dB  
RL = 100kΩ, AOL 106dB  
1
5
5
50  
50  
200  
200  
mV  
mV  
mV  
mV  
mV  
mV  
mA  
TA = –40°C to +85°C  
TA = –40°C to +85°C  
TA = –40°C to +85°C  
R
L = 10kΩ, AOL 100dB  
RL = 10k, AOL 100dB  
L = 2kΩ, AOL 94dB  
10  
40  
R
RL = 2k, AOL 94dB  
Short-Circuit Current  
ISC  
±50  
Capacitive Load Drive  
CLOAD  
See Typical Curve  
POWER SUPPLY  
Specified Voltage Range  
Operating Voltage Range  
Quiescent Current (per amplifier)  
VS  
IQ  
2.7  
5
V
V
µA  
µA  
2.5 to 5.5  
750  
IO = 0, VS = +5V  
IO = 0, VS = +5V  
950  
1100  
TA = –40°C to +85°C  
TEMPERATURE RANGE  
Specified Range  
Operating Range  
–40  
–55  
–55  
+85  
+125  
+125  
°C  
°C  
°C  
Storage Range  
Thermal Resistance  
SOT-23-5 Surface Mount  
MSOP-8 Surface Mount  
SO-8 Surface Mount  
8-Pin DIP  
SSOP-16 Surface Mount  
SO-14 Surface Mount  
14-Pin DIP  
θJA  
200  
150  
150  
100  
100  
100  
80  
°C/W  
°C/W  
°C/W  
°C/W  
°C/W  
°C/W  
°C/W  
NOTES: (1) VS = +5V. (2) VOUT = 0.25V to 3.25V. (3) Output voltage swings are measured between the output and power supply rails.  
®
OPA340/2340/4340  
2
PIN CONFIGURATIONS  
ELECTROSTATIC  
DISCHARGE SENSITIVITY  
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.  
Top View  
SOIC/DIP  
OPA4340  
Out A  
–In A  
+In A  
V+  
1
2
3
4
5
6
7
14 Out D  
13 –In D  
12 +In D  
11 V–  
A
B
D
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.  
+In B  
–In B  
Out B  
10 +In C  
9
8
–In C  
Out C  
ABSOLUTE MAXIMUM RATINGS(1)  
Supply Voltage ................................................................................... 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 ..................................................... –55°C to +125°C  
Junction Temperature ...................................................................... 150°C  
Lead Temperature (soldering, 10s) ................................................. 300°C  
NOTES: (1) Stresses above these ratings may cause permanent damage.  
(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(1)  
SPECIFIED  
TEMPERATURE  
RANGE  
PACKAGE  
MARKING  
ORDERING  
NUMBER(2)  
TRANSPORT  
MEDIA  
PRODUCT  
PACKAGE  
Single  
OPA340NA  
"
OPA340PA  
OPA340UA  
5-Lead SOT-23-5  
"
331  
"
006  
182  
–40°C to +85°C  
"
–40°C to +85°C  
–40°C to +85°C  
A40  
"
OPA340PA  
OPA340UA  
OPA340NA-250  
OPA340NA-3K  
OPA340PA  
Tape and Reel  
Tape and Reel  
Rails  
8-Pin DIP  
SO-8 Surface-Mount  
OPA340UA  
Rails(3)  
Dual  
OPA2340EA  
"
OPA2340PA  
OPA2340UA  
MSOP-8 Surface-Mount  
337  
"
006  
182  
–40°C to +85°C  
"
–40°C to +85°C  
–40°C to +85°C  
A40A  
"
OPA2340PA  
OPA2340UA  
OPA2340EA-250  
OPA2340EA-2500  
OPA2340PA  
Tape and Reel  
Tape and Reel  
Rails  
"
8-Pin DIP  
SO-8 Surface-Mount  
OPA2340UA  
Rails(3)  
Quad  
OPA4340EA  
"
OPA4340PA  
OPA4340UA  
SSOP-16 Surface-Mount  
322  
"
010  
235  
–40°C to +85°C  
"
–40°C to +85°C  
–40°C to +85°C  
OPA4340EA  
"
OPA4340PA  
OPA4340UA  
OPA4340EA-250  
OPA4340EA-2500  
OPA4340PA  
Tape and Reel  
Tape and Reel  
Rails  
"
14-Pin DIP  
SO-14 Surface Mount  
OPA4340UA  
Rails(3)  
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with -250, -2500, and  
-3K are available only in Tape and Reel in the quantities indicated (e.g., -250 indicates 250 devices per reel). Ordering 3000 pieces of “OPA340NA-3K” will get  
a single 3000 piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book. (3) SO-8 and SO-14  
models also available in Tape and Reel.  
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.  
®
3
OPA340/2340/4340  
TYPICAL PERFORMANCE CURVES  
At TA = +25°C, VS = +5V, and RL = 10kconnected to VS/2, unless otherwise noted.  
POWER SUPPLY and COMMON-MODE  
REJECTION vs FREQUENCY  
OPEN-LOOP GAIN/PHASE vs FREQUENCY  
160  
140  
120  
100  
80  
0
100  
80  
60  
40  
20  
0
PSRR  
–45  
–90  
–135  
–180  
60  
40  
CMRR  
20  
0
–20  
0.1  
1
10  
100  
1k  
10k 100k  
1M  
10M  
1
10  
100  
1k  
Frequency (Hz)  
10k  
100k  
1M  
Frequency (Hz)  
INPUT VOLTAGE AND CURRENT NOISE  
SPECTRAL DENSITY vs FREQUENCY  
CHANNEL SEPARATION vs FREQUENCY  
1k  
100  
10  
1
10k  
1k  
140  
130  
120  
110  
100  
Current Noise  
Voltage Noise  
100  
10  
1
G = 1, All Channels  
0.1  
1
10  
100  
1k  
10k  
100k  
1M  
10  
100  
1k  
10k  
100k  
Frequency (Hz)  
Frequency (Hz)  
CLOSED-LOOP OUTPUT IMPEDANCE  
vs FREQUENCY  
TOTAL HARMONIC DISTORTION + NOISE  
vs FREQUENCY  
0.1  
0.01  
5k  
4k  
3k  
2k  
1k  
0
G = 100  
RL = 600  
RL = 2k  
G = 10  
G = 10  
G = 1  
RL = 10k  
RL = 600  
RL = 2k  
G = 1  
0.001  
0.0001  
RL = 10k  
10  
100  
1k  
10k  
100k  
1M  
10M  
20  
100  
1k  
10k 20k  
Frequency (Hz)  
Frequency (Hz)  
®
OPA340/2340/4340  
4
TYPICAL PERFORMANCE CURVES (CONT)  
At TA = +25°C, VS = +5V, and RL = 10kconnected to VS/2, unless otherwise noted.  
OPEN-LOOP GAIN AND POWER SUPPLY REJECTION  
vs TEMPERATURE  
COMMON-MODE REJECTION vs TEMPERATURE  
130  
120  
110  
100  
90  
100  
90  
80  
70  
60  
50  
40  
RL = 100kΩ  
AOL  
RL = 10kΩ  
R
L = 2kΩ  
PSRR  
VS = 2.7V to 5V, VCM = –0.3V to (V+) –1.8V  
VS = 5V, VCM = –0.3V to 5.3V  
VS = 2.7V, VCM = –0.3V to 3V  
80  
–75  
–50 –25  
0
25  
50  
75  
100 125  
–75  
–50 –25  
0
25  
50  
75  
100 125  
Temperature (°C)  
Temperature (°C)  
QUIESCENT CURRENT vs SUPPLY VOLTAGE  
Per Amplifier  
QUIESCENT CURRENT vs TEMPERATURE  
Per Amplifier  
1000  
900  
800  
700  
600  
500  
800  
750  
700  
650  
600  
–75  
–50 –25  
0
25  
50  
75  
100 125  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
6.0  
Temperature (°C)  
Supply Voltage (V)  
SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE  
SHORT-CIRCUIT CURRENT vs TEMPERATURE  
–ISC  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
60  
50  
40  
30  
–ISC  
+ISC  
+ISC  
–75  
–50  
–25  
0
25  
50  
75  
100  
125  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
6.0  
Temperature (°C)  
Supply Voltage (V)  
®
5
OPA340/2340/4340  
TYPICAL PERFORMANCE CURVES (CONT)  
At TA = +25°C, VS = +5V, and RL = 10kconnected to VS/2, unless otherwise noted.  
INPUT BIAS CURRENT  
INPUT BIAS CURRENT vs TEMPERATURE  
vs INPUT COMMON-MODE VOLTAGE  
1k  
100  
10  
1.0  
0.8  
0.6  
0.4  
0.2  
0
–0.2  
–0.4  
–0.6  
–0.8  
–1.0  
1
0.1  
–75  
–50  
–25  
0
25  
50  
75  
100  
125  
–1  
0
1
2
3
4
5
6
Temperature (°C)  
Common-Mode Voltage (V)  
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT  
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY  
6
5
4
3
2
1
0
5
4
3
2
1
0
VS = 5.5V  
Maximum output  
voltage without  
slew rate-induced  
distortion.  
+125°C  
+25°C  
–55°C  
VS = 2.7V  
–55°C  
+125°C  
+25°C  
0
±10 ±20 ±30 ±40 ±50 ±60 ±70 ±80 ±90 ±100  
Output Current (mA)  
100k  
1M  
10M  
Frequency (Hz)  
OFFSET VOLTAGE DRIFT MAGNITUDE  
PRODUCTION DISTRIBUTION  
OFFSET VOLTAGE  
PRODUCTION DISTRIBUTION  
18  
16  
14  
12  
10  
8
25  
Typical production  
distribution of  
packaged units.  
Typical production  
distribution of  
packaged units.  
20  
15  
10  
5
6
4
2
0
0
0
1
2
3
4
5
6
7
8
9
10 11 12 13 15  
Offset Voltage Drift (µV/°C)  
Offset Voltage (µV)  
®
OPA340/2340/4340  
6
TYPICAL PERFORMANCE CURVES (CONT)  
At TA = +25°C, VS = +5V, and RL = 10kconnected to VS/2, unless otherwise noted.  
LARGE-SIGNAL STEP RESPONSE  
CL = 100pF  
SMALL-SIGNAL STEP RESPONSE  
CL = 100pF  
1µs/div  
1µs/div  
SETTLING TIME vs CLOSED-LOOP GAIN  
SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE  
100  
10  
1
60  
50  
40  
30  
20  
10  
0
G = –1  
0.01%  
G = +1  
0.1%  
G = –5  
See text for  
G = +5  
reducing overshoot.  
0.1  
100  
1000  
Load Capacitance (pF)  
10k  
1
10  
100  
1000  
Closed-Loop Gain (V/V)  
®
7
OPA340/2340/4340  
Power supply pins should be bypassed with 0.01µF ceramic  
capacitors.  
APPLICATIONS INFORMATION  
OPA340 series op amps are fabricated on a state-of-the-art  
0.6 micron CMOS process. They are unity-gain stable and  
suitable for a wide range of general purpose applications.  
Rail-to-rail input/output make them ideal for driving sam-  
pling A/D converters. In addition, excellent ac performance  
makes them well-suited for audio applications. The class AB  
output stage is capable of driving 600loads connected to  
any point between V+ and ground.  
OPERATING VOLTAGE  
OPA340 series op amps are fully specified from +2.7V to  
+5V. However, supply voltage may range from +2.5V to  
+5.5V. Parameters are guaranteed over the specified supply  
range—a unique feature of the OPA340 series. In addition,  
many specifications apply from –40°C to +85°C. Most  
behavior remains virtually unchanged throughout the full  
operating voltage range. Parameters which vary signifi-  
cantly with operating voltages or temperature are shown in  
the typical performance curves.  
Rail-to-rail input and output swing significantly increases  
dynamic range, especially in low supply applications.  
Figure 1 shows the input and output waveforms for the  
OPA340 in unity-gain configuration. Operation is from a  
single +5V supply with a 10kload connected to VS /2.  
The input is a 5Vp-p sinusoid. Output voltage is approxi-  
mately 4.98Vp-p.  
RAIL-TO-RAIL INPUT  
The input common-mode voltage range of the OPA340  
series extends 500mV beyond the supply rails. This is  
achieved with a complementary input stage—an N-channel  
input differential pair in parallel with a P-channel differen-  
tial pair (see Figure 2). The N-channel pair is active for input  
voltages close to the positive rail, typically  
(V+) –1.3V to 500mV above the positive supply, while the  
P-channel pair is on for inputs from 500mV 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 transi-  
tion 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.  
VS = +5, G = +1, RL = 10kΩ  
5
VIN  
5
VOUT  
0
FIGURE 1. Rail-to-Rail Input and Output.  
V+  
Reference  
Current  
VIN+  
VIN–  
VBIAS1  
Class AB  
Control  
VO  
Circuitry  
VBIAS2  
V–  
(Ground)  
FIGURE 2. Simplified Schematic.  
®
OPA340/2340/4340  
8
OPA340 series op amps are laser-trimmed to the reduce  
offset voltage difference between the N-channel and  
P-channel input stages, resulting in improved common-  
mode rejection and a smooth transition between the  
N-channel pair and the P-channel pair. However, within the  
400mV transition region PSRR, CMRR, offset voltage,  
offset drift, and THD may be degraded compared to opera-  
tion outside this region.  
CAPACITIVE LOAD AND STABILITY  
OPA340 series op amps can drive a wide range of capacitive  
loads. However, all op amps under certain conditions may  
become unstable. Op amp configuration, gain, and load  
value are just a few of the factors to consider when determin-  
ing stability. An op amp in unity gain configuration is the  
most susceptible to the effects of capacitive load. The  
capacitive load reacts with the op amp’s output resistance,  
along with any additional load resistance, to create a pole in  
the small-signal response which degrades the phase margin.  
In unity gain, OPA340 series op amps perform well, with a  
pure capacitive load up to approximately 1000pF. Increasing  
gain enhances the amplifier’s ability to drive more capaci-  
tance. See the typical performance curve “Small-Signal  
Overshoot vs Capacitive Load.”  
A double-folded cascode adds the signal from the two input  
pairs and presents a differential signal to the class AB output  
stage. Normally, input bias current is approximately 200fA,  
however, input voltages exceeding the power supplies by  
more than 500mV can cause excessive current to flow in or  
out of the input pins. Momentary voltages greater than  
500mV beyond the power supply can be tolerated if the  
current on the input pins is limited to 10mA. This is easily  
accomplished with an input resistor as shown in Figure 3.  
Many input signals are inherently current-limited to less  
than 10mA, therefore, a limiting resistor is not required.  
One method of improving capacitive load drive in the unity  
gain configuration is to insert a 10to 20resistor in series  
with the output, as shown in Figure 4. This significantly  
reduces ringing with large capacitive loads. However, if  
there is a resistive load in parallel with the capacitive load,  
it creates a voltage divider introducing a dc error at the  
output and slightly reduces output swing. This error may be  
insignificant. For instance, with RL = 10kand RS = 20,  
there is only about a 0.2% error at the output.  
V+  
IOVERLOAD  
10mA max  
VOUT  
OPAx340  
DRIVING A/D CONVERTERS  
VIN  
OPA340 series op amps are optimized for driving medium  
speed (up to 100kHz) sampling A/D converters. However,  
they also offer excellent performance for higher speed  
converters. The OPA340 series provides an effective means  
of buffering the A/D’s input capacitance and resulting  
charge injection while providing signal gain.  
5kΩ  
FIGURE 3. Input Current Protection for Voltages Exceeding  
the Supply Voltage.  
Figures 5 and 6 show the OPA340 driving an ADS7816.  
The ADS7816 is a 12-bit, micro-power sampling converter  
in the tiny MSOP-8 package. When used with the minia-  
ture package options of the OPA340 series, the combina-  
tion is ideal for space-limited and low power applications.  
For further information consult the ADS7816 data sheet.  
RAIL-TO-RAIL OUTPUT  
A class AB output stage with common-source transistors is  
used to achieve rail-to-rail output. For light resistive loads  
(>50k), the output voltage is typically a few millivolts  
from the supply rails. With moderate resistive loads (2kto  
50k), the output can swing to within a few tens of milli-  
volts from the supply rails and maintain high open-loop  
gain. See the typical performanc curve “Output Voltage  
Swing vs Output Current.”  
With the OPA340 in a noninverting configuration, an RC  
network at the amplifier’s output can be used to filter high  
frequency noise in the signal (Figure 5). In the inverting  
configuration, filtering may be accomplished with a ca-  
pacitor across the feedback resistor (Figure 6).  
V+  
RS  
VOUT  
OPAx340  
10to  
20Ω  
VIN  
CL  
RL  
FIGURE 4. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive.  
9
®
OPA340/2340/4340  
+5V  
0.1µF  
0.1µF  
VREF  
1
8
V+  
7
6
5
DCLOCK  
DOUT  
500Ω  
+In  
2
Serial  
Interface  
ADS7816  
12-Bit A/D  
OPA340  
VIN  
–In  
CS/SHDN  
3
3300pF  
GND  
4
VIN = 0V to 5V for  
0V to 5V output.  
NOTE: A/D Input = 0 to VREF  
RC network filters high frequency noise.  
FIGURE 5. OPA340 in Noninverting Configuration Driving ADS7816.  
+5V  
330pF  
0.1µF  
0.1µF  
5kΩ  
5kΩ  
VIN  
1
VREF  
8
V+  
7
6
5
DCLOCK  
DOUT  
+In  
2
Serial  
Interface  
ADS7816  
12-Bit A/D  
OPA340  
–In  
CS/SHDN  
3
GND  
4
VIN = 0V to –5V for 0V to 5V output.  
NOTE: A/D Input = 0 to VREF  
FIGURE 6. OPA340 in Inverting Configuration Driving ADS7816.  
Filters 160Hz to 2.4kHz  
+5V  
10MΩ  
VIN  
243kΩ  
1.74MΩ  
1/2  
OPA2340  
200pF  
1/2  
OPA2340  
10MΩ  
47pF  
RL  
220pF  
FIGURE 7. Speech Bandpass Filter.  
®
OPA340/2340/4340  
10  
PACKAGE OPTION ADDENDUM  
www.ti.com  
6-Dec-2006  
PACKAGING INFORMATION  
Orderable Device  
OPA2340EA/250  
OPA2340EA/250G4  
OPA2340EA/2K5  
OPA2340EA/2K5G4  
OPA2340PA  
Status (1)  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
OBSOLETE  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
MSOP  
DGK  
8
250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
MSOP  
MSOP  
MSOP  
PDIP  
DGK  
DGK  
DGK  
P
8
250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
8
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
8
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
8
50 Green (RoHS & CU NIPDAU N / A for Pkg Type  
no Sb/Br)  
OPA2340PAG4  
OPA2340UA  
PDIP  
P
8
50 Green (RoHS & CU NIPDAU N / A for Pkg Type  
no Sb/Br)  
SOIC  
D
8
100 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
OPA2340UA/2K5  
OPA2340UA/2K5G4  
OPA2340UAG4  
OPA340NA/250  
OPA340NA/250G4  
OPA340NA/3K  
SOIC  
D
8
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
SOIC  
D
8
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
SOIC  
D
8
100 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
SOT-23  
SOT-23  
SOT-23  
SOT-23  
PDIP  
DBV  
DBV  
DBV  
DBV  
P
5
250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
5
250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
5
3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
OPA340NA/3KG4  
OPA340PA  
5
3000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
8
50 Green (RoHS & CU NIPDAU N / A for Pkg Type  
no Sb/Br)  
OPA340PAG4  
PDIP  
P
8
50 Green (RoHS & CU NIPDAU N / A for Pkg Type  
no Sb/Br)  
OPA340UA  
SOIC  
D
8
100 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
OPA340UA/2K5  
OPA340UA/2K5G4  
OPA340UAG4  
SOIC  
D
8
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
SOIC  
D
8
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
SOIC  
D
8
100 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
OPA4340EA/250  
OPA4340EA/250G4  
OPA4340EA/2K5  
OPA4340EA/2K5G4  
OPA4340PA  
SSOP/  
QSOP  
DBQ  
DBQ  
DBQ  
DBQ  
N
16  
16  
16  
16  
14  
250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
SSOP/  
QSOP  
250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
SSOP/  
QSOP  
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
SSOP/  
QSOP  
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
PDIP  
TBD  
Call TI  
Call TI  
Addendum-Page 1  
PACKAGE OPTION ADDENDUM  
www.ti.com  
6-Dec-2006  
Orderable Device  
OPA4340UA  
Status (1)  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
SOIC  
D
14  
14  
14  
14  
58 Green (RoHS & CU NIPDAU Level-3-260C-168 HR  
no Sb/Br)  
OPA4340UA/2K5  
OPA4340UA/2K5G4  
OPA4340UAG4  
SOIC  
SOIC  
SOIC  
D
D
D
2500 Green (RoHS & CU NIPDAU Level-3-260C-168 HR  
no Sb/Br)  
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
58 Green (RoHS & CU NIPDAU Level-3-260C-168 HR  
no Sb/Br)  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in  
a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
(2)  
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check  
http://www.ti.com/productcontent for the latest availability information and additional product content details.  
TBD: The Pb-Free/Green conversion plan has not been defined.  
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements  
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered  
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.  
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and  
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS  
compatible) as defined above.  
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame  
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)  
(3)  
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder  
temperature.  
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is  
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the  
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take  
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on  
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited  
information may not be available for release.  
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI  
to Customer on an annual basis.  
Addendum-Page 2  
MECHANICAL DATA  
MPDI001A – JANUARY 1995 – REVISED JUNE 1999  
P (R-PDIP-T8)  
PLASTIC DUAL-IN-LINE  
0.400 (10,60)  
0.355 (9,02)  
8
5
0.260 (6,60)  
0.240 (6,10)  
1
4
0.070 (1,78) MAX  
0.325 (8,26)  
0.300 (7,62)  
0.020 (0,51) MIN  
0.015 (0,38)  
Gage Plane  
0.200 (5,08) MAX  
Seating Plane  
0.010 (0,25) NOM  
0.125 (3,18) MIN  
0.100 (2,54)  
0.021 (0,53)  
0.430 (10,92)  
MAX  
0.010 (0,25)  
M
0.015 (0,38)  
4040082/D 05/98  
NOTES: A. All linear dimensions are in inches (millimeters).  
B. This drawing is subject to change without notice.  
C. Falls within JEDEC MS-001  
For the latest package information, go to http://www.ti.com/sc/docs/package/pkg_info.htm  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
IMPORTANT NOTICE  
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,  
enhancements, improvements, and other changes to its products and services at any time and to discontinue  
any product or service without notice. Customers should obtain the latest relevant information before placing  
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms  
and conditions of sale supplied at the time of order acknowledgment.  
TI warrants performance of its hardware products to the specifications applicable at the time of sale in  
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI  
deems necessary to support this warranty. Except where mandated by government requirements, testing of all  
parameters of each product is not necessarily performed.  
TI assumes no liability for applications assistance or customer product design. Customers are responsible for  
their products and applications using TI components. To minimize the risks associated with customer products  
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Microcontrollers  
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Security  
www.ti.com/opticalnetwork  
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Copyright 2006, Texas Instruments Incorporated  

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