TEXAS INSTRUMENTS OPA703 Technical data

®
OPA703
O
P
A
70
3
OPA703
P
A
7
0
3
CMOS, Rail-to-Rail, I/O
OPERATIONAL AMPLIFIERS
OPA703
OPA2703 OPA4703
OPA704
OPA2704 OPA4704
SBOS180A – MARCH 2001
FEATURES
RAIL-TO-RAIL INPUT AND OUTPUT
WIDE SUPPLY RANGE:
Single Supply: 4V to 12V Dual Supplies:
±2 to ±6
LOW QUIESCENT CURRENT: 160µA
FULL-SCALE CMRR: 90dB
LOW OFFSET: 160µV
HIGH SPEED:
OPA703: 1MHz, 0.6V/ µs OPA704: 3MHz, 3V/µs
Micro
SIZE PACKAGES:
SOT23-5, MSOP-8, TSSOP-14
LOW INPUT BIAS CURRENT: 1pA
APPLICATIONS
AUTOMOTIVE APPLICATIONS:
Audio, Sensor Applications, Security Systems
PORTABLE EQUIPMENT
ACTIVE FILTERS
TRANSDUCER AMPLIFIER
TEST EQUIPMENT
DATA ACQUISITION
OPA703
OPA704
Out
V–
+In
1 2 3
SOT23-5
V+
5
–In
4
Out A
–In A +In A
V–
OPA2703 OPA2704
1
A
2 3 4
MSOP-8, SO-8, DIP-8
DESCRIPTION
The OPA703 and OPA704 series op amps are optimized for applications requiring rail-to-rail input and output swing. Single, dual, and quad versions are offered in a variety of packages. While the quiescent current is less than 200µA per amplifier, the OPA703 still offers excellent dynamic perfor­mance (1MHz GBW and 0.6V/µs SR) and unity-gain stabil­ity. The OPA704 is optimized for gains of 5 or greater and provides 3MHz GBW and 3V/µs slew rate.
The OPA703 and OPA704 series are fully specified and guaranteed over the supply range of ±2V to ±6V. Input swing extends 300mV beyond the rail and the output swings to within 40mV of the rail.
The single versions (OPA703 and OPA704) are available in the MicroSIZE SOT23-5 and in the standard SO-8 surface­mount, as well as the DIP-8 packages. Dual versions (OPA2703 and OPA2704) are available in the MSOP-8, SO-8, and DIP-8 packages. The quad OPA4703 and OPA4704 are available in the TSSOP-14 and SO-14 pack­ages. All are specified for operation from –40°C to +85°C.
OPA703
OPA704
NC
1
–In
2
+In
3
V–
4
SO-8, DIP-8
V+
8
Out B
7
B
–In B
6
+In B
5
NC
8
V+
7
Out
6
Out A
–In A +In A
V+ +In B –In B
Out B
1 2 3 4 5 6 7
NC
5
OPA4703 OPA4704
14
AD
BC
TSSOP-14, SO-14
13 12 11 10
9 8
Out D –In D +In D V– +In C –In C Out C
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 2001, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V+ to V–................................................................. 13.2V
Signal Input Terminals, Voltage
Output Short-Circuit
Operating Temperature ..................................................–55°C to +125°C
Storage Temperature ..................................................... –65°C to +150°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTES: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. (2) Input terminals are diode-clamped to the power supply rails. Input signals that can swing more than 0.3V beyond the supply rails should be current-limited to 10mA or less. (3) Short-circuit to ground, one amplifier per package.
(3)
(2)
.....................(V–) –0.3V to (V+) +0.3V
(2)
Current
.............................................................. Continuous
.................................................... 10mA
(1)
ELECTROSTATIC DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru­ments 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.
PACKAGE/ORDERING INFORMATION
MINIMUM PACKAGE
PRODUCT DESCRIPTION GAIN PACKAGE NUMBER MARKING NUMBER
RECOMMENDED DRAWING PACKAGE ORDERING TRANSPORT
OPA703NA Single, GBW = 1MHz 1 SOT23-5 331 A03 OPA703NA/250 Tape and Reel
""""""OPA703NA/3K Tape and Reel
OPA703UA Single, GBW = 1MHz 1 SO-8 182 OPA703UA OPA703UA Rails
""""""OPA703UA/2K5 Tape and Reel
OPA703PA Single, GBW = 1MHz 1 DIP-8 006 OPA703PA OPA703PA Rails OPA2703EA Dual, GBW = 1MHz 1 MSOP-8 337 B03 OPA2703EA/250 Tape and Reel
""""""OPA2703EA/2K5 Tape and Reel
OPA2703UA Dual, GBW = 1MHz 1 SO-8 182 OPA2703UA OPA2703UA Rails
""""""OPA2703UA/2K5 Tape and Reel
OPA2703PA Dual, GBW = 1MHz 1 DIP-8 006 OPA2703PA OPA2703PA Rails OPA4703EA Quad, GBW = 1MHz 1 TSSOP-14 357 OPA4703EA OPA4703EA/250 Tape and Reel
""""""OPA4703EA/2K5 Tape and Reel
OPA4703UA Quad, GBW = 1MHz 1 SO-14 235 OPA4703UA OPA4703UA Rails
""""""OPA4703UA/2K5 Tape and Reel
OPA704NA Single, GBW = 5MHz 5 SOT23-5 331 A04 OPA704NA/250 Tape and Reel
""""""OPA704NA/3K Tape and Reel
OPA704UA Single, GBW = 5MHz 5 SO-8 182 OPA704UA OPA704UA Tape and Reel
""""""OPA704UA/2K5 Tape and Reel
OPA704PA Single, GBW = 5MHz 5 DIP-8 006 OPA704PA OPA704PA Rails OPA2704EA Dual, GBW = 5MHz 5 MSOP-8 337 B04 OPA2703EA/250 Tape and Reel
""""""OPA2703EA/2K5 Tape and Reel
OPA2704UA Dual, GBW = 5MHz 5 SO-8 182 OPA2704UA OPA2704UA Rails
""""""OPA2704UA/2K5 Tape and Reel
OPA2704PA Dual, GBW = 5MHz 5 DIP-8 006 OPA2704PA OPA2704PA Rails OPA4704EA Quad, GBW = 5MHz 5 TSSOP-14 357 OPA4704EA OPA4704EA/250 Tape and Reel
""""""OPA4704EA/2K5 Tape and Reel
OPA4704UA Quad, GBW = 5MHz 5 SO-14 235 OPA4704UA OPA4704UA Rails
""""""OPA4704UA/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 OPA703NA/3K will get a single 3000-piece Tape and Reel.
(1)
MEDIA
2
OPA703, OPA704
SBOS180A
OPA703 ELECTRICAL CHARACTERISTICS: VS = 4V to 12V
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, RL = 20k connected to VS/2 and V
PARAMETER CONDITION MIN TYP MAX UNITS OFFSET VOLTAGE
Input Offset Voltage V
Drift dV
vs Power Supply PSRR V
/dT TA = –40°C to +85°C ±4 µV/°C
OS
Over Temperature V
Channel Separation, dc R
f = 1kHz 98 dB
INPUT VOLTAGE RANGE
Common-Mode Voltage Range V Common-Mode Rejection Ratio CMRR
over Temperature
over Temperature
INPUT BIAS CURRENT
Input Bias Current I Input Offset Current I
INPUT IMPEDANCE
Differential 4 10 Common-Mode 5 10
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz Input Voltage Noise Density, f = 1kHz e Current Noise Density, f = 1kHz i
OPEN-LOOP GAIN
Open-Loop Voltage Gain A
over Temperature
over Temperature R
OUTPUT
Voltage Output Swing from Rail R
over Temperature R
over Temperature R
Output Current I Short-Circuit Current I Capacitive Load Drive C
OUT
LOAD
FREQUENCY RESPONSE C Gain-Bandwidth Product GBW G = +1 1 MHz Slew Rate SR V Settling Time, 0.1% t
0.01% V Overload Recovery Time V Total Harmonic Distortion + Noise THD+N V
POWER SUPPLY
Specified Voltage Range, Single Supply V Specified Voltage Range, Dual Supplies V Operating Voltage Range 3.6 to 12 V Quiescent Current (per amplifier) I
over Temperature 300
TEMPERATURE RANGE
Specified Range –40 85 °C Operating Range –55 125 °C Storage Range –65 150 °C Thermal Resistance
θ
SOT23-5 Surface-Mount 200 °C/W MSOP-8 Surface-Mount 150 °C/W TSSOP-14 Surface-Mount 100 °C/W SO-8 Surface Mount 150 °C/W SO-14 Surface Mount 100 °C/W DIP-8 100 °C/W
= VS/2, unless otherwise noted.
OUT
OPA703NA, UA, PA
OPA2703EA, UA, PA
OPA4703EA, UA
OS
CM
B
OS
n n
OLRL
RL = 20k, (V–)+0.075V < VO < (V+)–0.075V 100 110 dB
RL = 20kΩ, (V–)+0.075V < VO < (V+)–0.075V
R
SC
S
S S
Q
JA
VS = ±5V, VCM = 0V ±160 ±750 µV
= ±2V to ±6V, VCM = 0V 20 100 µV/V
S
= ±2V to ±6V, VCM = 0V 200 µV/V
S
= 20k 1 µV/V
L
(V–) – 0.3 (V+) + 0.3 V
VS = ±5V, (V–) – 0.3V < VCM < (V+) + 0.3V
VS = ±5V, (V–) < VCM < (V+)
VS = ±5V, (V–) – 0.3V < VCM < (V+) – 2V
VS = ±5V, (V–) < VCM < (V+) – 2V
VS = ±5V, VCM = 0V VS = ±5V, VCM = 0V
VS = ±5V, VCM = 0V VS = ±5V, VCM = 0V VS = ±5V, VCM = 0V
70 90 dB
68 dB
80 96 dB
74 dB
±1 ±10 pA
±0.5 ±10 pA
9
|| 4 || pF
12
|| 4 || pF
6 µVp-p
45 nV/Hz
2.5 fA/Hz
= 100k, (V–)+0.1V < VO < (V+)–0.1V 120 dB
96 dB
= 5k, (V–)+0.15V < VO < (V+)–0.15V 100 110 dB
L
= 5kΩ, (V–)+0.15V < VO < (V+)–0.15V 96 dB
L
= 100k, A
L
R
= 20k, A
L
= 20kΩ, AOL > 96dB 75 mV
L
R
= 5k, AOL > 100dB 150 mV
L
= 5kΩ, AOL > 96dB 150 mV
L
|VS – V
> 80dB 40 mV
OL
> 100dB 75 mV
OL
| < 1V ±10 mA
OUT
±40 mA
See Typical Performance Curves
= 100pF
L
= ±5V, G = +1 0.6 V/µs
S
VS = ±5V, 5V Step, G = +1 15 µs
= ±5V, 5V Step, G = +1 20 µs
S
Gain = V
= ±5V, VO = 3Vp-p, G = +1, f = 1kHz 0.02 %
S
IN
S
3 µs
412V
±2 ±6V
IO = 0 160 200 µA
µA
OPA703, OPA704
SBOS180A
3
OPA704 ELECTRICAL CHARACTERISTICS: VS = 4V to 12V
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, RL = 20k connected to VS/2 and V
PARAMETER CONDITION MIN TYP MAX UNITS OFFSET VOLTAGE
Input Offset Voltage V
Drift dV
vs Power Supply PSRR V
/dT TA = –40°C to +85°C ±4 µV/°C
OS
Over Temperature V
Channel Separation, dc R
f = 1kHz 98 dB
INPUT VOLTAGE RANGE
Common-Mode Voltage Range V Common-Mode Rejection Ratio CMRR
CM
over Temperature
over Temperature
INPUT BIAS CURRENT
Input Bias Current I Input Offset Current I
INPUT IMPEDANCE
Differential 4 10 Common-Mode 5 10
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz Input Voltage Noise Density, f = 1kHz e Current Noise Density, f = 1kHz i
OPEN-LOOP GAIN
Open-Loop Voltage Gain A
over Temperature RL = 20kΩ, (V–)+0.075V < VO < (V+)–0.075V 96 dB
over Temperature R
OUTPUT
Voltage Output Swing from Rail R
over Temperature R
over Temperature R
Output Current I Short-Circuit Current I Capacitive Load Drive C
OUT
LOAD
FREQUENCY RESPONSE C Gain-Bandwidth Product GBW G = +5 3 MHz Slew Rate SR V Settling Time, 0.1% t
0.01% V Overload Recovery Time V Total Harmonic Distortion + Noise THD+N V
POWER SUPPLY
Specified Voltage Range, Single Supply V Specified Voltage Range, Dual Supplies V Operating Voltage Range 3.6 to 12 V Quiescent Current (per amplifier) I
over Temperature 300
TEMPERATURE RANGE
Specified Range –40 85 °C Operating Range –55 125 °C Storage Range –65 150 °C Thermal Resistance
θ
SOT23-5 Surface-Mount 200 °C/W MSOP-8 Surface-Mount 150 °C/W TSSOP-14 Surface-Mount 100 °C/W SO-8 Surface Mount 150 °C/W SO-14 Surface Mount 100 °C/W DIP-8 100 °C/W
= VS/ 2, unless otherwise noted.
OUT
OPA704NA, UA, PA
OPA2704EA, UA, PA
OPA4704EA, UA
OS
VS = ±5V, VCM = 0V ±160 ±750 µV
= ±2V to ±6V, VCM = 0V 20 100 µV/V
S
= ±2V to ±6V, VCM = 0V 200 µV/V
S
= 20k 1 µV/V
L
(V–) – 0.3 (V+) + 0.3 V
VS = ±5V, (V–) – 0.3V < VCM < (V+) + 0.3V
VS = ±5V, (V–) < VCM < (V+)
VS = ±5V, (V–) – 0.3V < VCM < (V+) – 2V
VS = ±5V, (V–) < VCM < (V+) – 2V
B
OS
VS = ±5V, VCM = 0V VS = ±5V, VCM = 0V
VS = ±5V, VCM = 0V
n n
OLRL
RL = 20k, (V–)+0.075V < VO < (V+)–0.075V 100 110 dB
R
L
L
SC
S
S
S S
Q
JA
VS = ±5V, VCM = 0V VS = ±5V, VCM = 0V
= 100k, (V–)+0.1V < VO < (V+)–0.1V 120 dB
= 5k, (V–)+0.15V < VO < (V+)–0.15V 100 110 dB
= 5kΩ, (V–)+0.15V < VO < (V+)–0.15V 96 dB
= 100k, A
L
R
= 20k, A
L
= 20kΩ, AOL > 96dB 75 mV
L
R
= 5k, AOL > 100dB 150 mV
L
= 5kΩ, AOL > 96dB 150 mV
L
|VS – V
= ±5V, G = +5 3 V/µs
S
VS = ±5V, 5V Step, G = +5 18 µs
= ±5V, 5V Step, G = +5 21 µs
S
Gain = V
= ±5V, VO = 3Vp-p, G = +5, f = 1kHz 0.025 %
IN
> 80dB 40 mV
OL
> 100dB 75 mV
OL
| < 1V ±10 mA
OUT
= 100pF
L
S
IO = 0 160 200 µA
70 90 dB
68 dB
80 96 dB
74 dB
±1 ±10 pA
±0.5 ±10 pA
9
|| 4 || pF
12
|| 4 || pF
6 µVp-p
45 nV/Hz
2.5 fA/Hz
±40 mA
See Typical Performance Curves
0.6 µs
412V
±2 ±6V
µA
4
OPA703, OPA704
SBOS180A
TYPICAL CHARACTERISTICS
PSRR vs FREQUENCY
1
PSRR (dB)
Frequency (Hz)
10 1k100 10k 100k 1M
140
120
100
80
60
40
20
0
At TA = +25°C, VS = ±5V, and RL = 20k, unless otherwise noted.
120 100
80 60 40 20
Gain (dB)
0
204060
10
120
100
80
60
OPA703 GAIN AND PHASE vs FREQUENCY
100 10k1k 100k 1M 10M
Frequency (Hz)
CMRR vs FREQUENCY
CMRR Limited Range
CMRR Full Scale
120 100 80 60 40 20 0
204060
120 100
80 60 40
Gain (dB)
Phase (°)
20
0
2040
OPA704 GAIN AND PHASE vs FREQUENCY
100 10k1k 100k 1M 10M
10
Frequency (Hz)
120 100 80 60 40 20 0
2040
Phase (°)
CMRR (dB)
40
20
0
10 1k100 10k 100k 1M
1
Frequency (Hz)
7
6
5
4
3
Amplitude (V)
2
1
0
100
MAXIMUM AMPLITUDE vs FREQUENCY
(V+) – (V–) = 12V
OPA704
OPA703
1k 10k 100k 1M 10M
Frequency (Hz)
160 140 120 100
80 60 40
Channel Separation (dB)
20
0
CHANNEL SEPARATION vs FREQUENCY
10
100 1k 10k 100k 1M
Frequency (Hz)
OPA703, OPA704
SBOS180A
5
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±5V, and RL = 20k, unless otherwise noted.
10000
1000
100
10
Spectral Noise nV/Hz
1
Input Current and Voltage
0.1
0.1
140
130
120
(dB)
OL
A
110
100
SPECTRAL NOISE vs FREQUENCY
OPEN-LOOP GAIN vs TEMPERATURE
INPUT CURRENT AND VOLTAGE
Current
Voltage
Noise
101 100 1k 10k 100k 1M
Frequency (Hz)
Noise
10000
1000
100
10
1
0.1
Noise fA/Hz
Output Current Spectral
Bias Current (pA)
120
110
100
90
CMRR (dB)
80
70
60
100000
10000
1000
100
10
0.1
COMMON-MODE REJECTION RATIO
vs TEMPERATURE
Limited Scale
Full Scale
–80
1
–40–60 –20 200 40 60 80 100 120 140
Temperature (°C)
INPUT BIAS (IB) AND OFFSET (IOS)
CURRENT vs TEMPERATURE
I
B
I
OS
90
–100
250
200
150
(µA)
Q
I
100
50
0
100
5075 25 500 25 75 100 125 150 175
Temperature (°C)
QUIESCENT CURRENT vs TEMPERATURE
–75 –50 –25 50250 75 100 125 150 175
Temperature (°C)
0.0 –50
120
110
100
90
PSRR (dB)
80
70
60
75
25 0 5025 75
Temperature (°C)
PSRR vs TEMPERATURE
–25–50 0 5010 25 75 100 110 130 150
Temperature (°C)
100 125 175150
6
OPA703, OPA704
SBOS180A
TYPICAL CHARACTERISTICS (Cont.)
INPUT BIAS CURRENT (IB)
vs COMMON-MODE VOLTAGE (V
CM
)
TEMPERATURE = °25C
–6
Input Bias Current (pA)
Common-Mode Voltage, VCM (V)
–5 –4 –3 –10–2123456
15
10
5
0
5
10
15
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
0
Output Voltage (V)
Output Current (±mA)
10 20 4030 50 60 70
6
4
2
0
2
4
6
Sourcing
Sinking
+125°C
+25°C
–55°C
+125°C
+25°C
–55°C
At TA = +25°C, VS = ±5V, and RL = 20k, unless otherwise noted.
TOTAL HARMONIC DISTORTION PLUS NOISE
1.000
(Load = 5k, BW = 8kHz, 1.0Vrms)
0.100
THD (%)
0.010
0.001 1
15
10
5
0
–5
Input Bias Current (nA)
10
15
5 4 3 102123456
6
G = +5
OPA704
OPA703
G = +1
10 1k100 10k 100k
Frequency (Hz)
INPUT BIAS CURRENT (IB)
vs COMMON-MODE VOLTAGE (V
TEMPERATURE = 125°C
Common-Mode Voltage, VCM (V)
)
CM
200 190 180 170 160 150 140
Quiescent Current (µA)
130 120
QUIESCENT CURRENT vs SUPPLY VOLTAGE
2
486101214
Supply Voltage (V)
60
50
40
30
20
Short-Circuit Current (mA)
10
0
2
OPA703, OPA704
SBOS180A
SHORT-CIRCUIT CURRENT
vs SUPPLY VOLTAGE
N (Sinking)
I
SC
ISC P (Sourcing)
486101214
Supply Voltage (V)
7
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±5V, and RL = 20k, unless otherwise noted.
90 80 70 60 50 40
Overshoot (%)
30 20 10
0
10
100
90 80 70 60 50 40
Settling Time (µs)
30 20 10
1
OPA703 SMALL-SIGNAL OVERSHOOT (%)
vs CAPACITIVE LOAD AND GAIN
G = +1
G = –1
G = +5
100 1k 10k
Load Capacitance Value (pF)
OPA703 SETTLING TIME vs GAIN
0.01%
0.1%
10 100
Non-Inverting Gain (V/V)
90 80 70 60 50 40
Overshoot (%)
30 20 10
0
10
50 45 40 35 30 25
Settling Time (µs)
20 15 10
1
OPA704 SMALL-SIGNAL OVERSHOOT (%)
vs CAPACITIVE LOAD
G = +5
100 1k 10k Capacitance Load (pF)
OPA704 SETTLING TIME vs GAIN
0.01%
0.10%
10 100
Non-Inverting Gain (V/V)
Frequency (%)
8
25
20
15
10
5
0
VOS PRODUCTION DISTRIBUTION
0.60
0.45
0.30
0.15
< 0.00
< 0.15
Voltage Offset (µV)
< 0.30
< 0.45
< 0.60
< 0.75
25
20
15
10
Frequency (%)
5
0
VOS DRIFT PRODUCTION DISTRIBUTION
6
9
3
< 0
< 6
30
27
24
18
12
21
15
Voltage Offset (µV/°C)
< 3
< 9
< 12
< 15
< 18
< 21
< 24
< 27
< 30
> 30
OPA703, OPA704
SBOS180A
TYPICAL CHARACTERISTICS (Cont.)
OPA704 SMALL SIGNAL STEP RESPONSE
(G = +5V/V, C
F
= 3pF, RF = 100kΩ,
C
L
= 100pF, RL = 20k,)
5µs/div
50mV/div
OPA704 LARGE SIGNAL STEP RESPONSE
(G = +5V/V, R
L
= 20k, CF = 3pF, CL = 100pF)
2µs/div
1V/div
At TA = +25°C, VS = ±5V, and RL = 20k, unless otherwise noted.
OPA703 SMALL SIGNAL STEP RESPONSE
(G = +1V/V, R
50mV/div
OPA703 LARGE SIGNAL STEP RESPONSE
(G = +1V/V, R
= 20k, CL = 100pF)
L
5µs/div
= 20k, CL = 100pF)
L
1V/div
10µs/div
OPA703, OPA704
SBOS180A
9
APPLICATIONS INFORMATION
OPA703 and OPA704 series op amps can operate on 160µA quiescent current from a single (or split) supply in the range of 4V to 12V (±2V to ±6V), making them highly versatile and easy to use. The OPA703 is unity-gain stable and offers 1MHz bandwidth and 0.6V/µs slew rate. The OPA704 is optimized for gains of 5 or greater with a 3MHz bandwidth and 3V/µs slew rate.
Rail-to-rail input and output swing helps maintain dynamic range, especially in low supply applications. Figure 1 shows the input and output waveforms for the OPA703 in unity­gain configuration. Operation is from a ±5V supply with a 100k load connected to VS/2. The input is a 10Vp-p sinusoid. Output voltage is approximately 10Vp-p.
Input
2.0V/div
Output (inverted on scope)
200µs/div
G = +1, VS = ±5V
Power-supply pins should be bypassed with 1000pF ceramic capacitors in parallel with 1µF tantalum capacitors.
OPERATING VOLTAGE
OPA703 and OPA704 series op amps are fully specified and guaranteed from +4V to +12V over a temperature range of –40ºC to +85ºC. 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 OPA703 series extends 300mV beyond the supply rails at room temperature. This is achieved with a complementary input stage—an N­channel input differential pair in parallel with a P-channel differential pair, as shown in Figure 2. The N-channel pair is active for input voltages close to the positive rail, typically (V+) – 2.0V to 300mV above the positive supply, while the P­channel pair is on for inputs from 300mV below the negative supply to approximately (V+) – 1.5V. There is a small transition region, typically (V+) – 2.0V to (V+) – 1.5V, in which both pairs are on. This 500mV transition region can vary ±100mV with process variation. Thus, the transition region (both stages on) can range from (V+) – 2.1V to (V+) – 1.4V on the low end, up to (V+) – 1.9V to (V+) – 1.6V on the high end. Within the 500mV transition region PSRR, CMRR, offset voltage, and offset drift, and THD may vary compared to operation outside this region.
FIGURE 1. Rail-to-Rail Input and Output.
V+
VIN+
V–
VIN–
V
O
FIGURE 2. Simplified Schematic.
10
OPA703, OPA704
SBOS180A
INPUT VOLTAGE
R
S
20
OPA703
C
L
R
L
V
IN
V
OUT
Device inputs are protected by ESD diodes that will conduct if the input voltages exceed the power supplies by more than approximately 300mV. Momentary voltages greater than 300mV beyond the power supply can be tolerated if the current 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 always required. The OPA703 features no phase inversion when the inputs extend beyond supplies if the input current is limited, as seen in Figure 4.
+V
I
OVERLOAD
10mA max
V
IN
R
OPA703
V–
V
OUT
FIGURE 3. Input Current Protection for Voltages Exceeding
the Supply Voltage.
CAPACITIVE LOAD AND STABILITY
The OPA703 and OPA704 series op amps can drive up to 1000pF pure capacitive load. Increasing the gain enhances the amplifier’s ability to drive greater capacitive loads (see the typical performance curve “Small Signal Overshoot vs Capacitive Load”).
One method of improving capacitive load drive in the unity­gain configuration is to insert a 10 to 20Ω resistor inside the feedback loop, as shown in Figure 5. This reduces ringing with large capacitive loads while maintaining DC
accuracy.
FIGURE 5. Series Resistor in Unity-Gain Buffer Configura-
tion Improves Capacitive Load Drive.
VS = ±5.0V, VIN = 11Vp-p
2.0V/div
20µs/div
FIGURE 4. OPA703—No Phase Inversion with Inputs
Greater than the Power-Supply Voltage.
RAIL-TO-RAIL OUTPUT
A class AB output stage with common-source transistors is used to achieve rail-to-rail output. This output stage is capable of driving 1k loads connected to any point be­tween V+ and ground. For light resistive loads (> 100kΩ), the output voltage can swing to 40mV from the supply rail. With moderate resistive loads (20k), the output can swing to within 75mV from the supply rails while maintaining high open-loop gain (see the typical performance curve “Output Voltage Swing vs Output Current”).
APPLICATION CIRCUITS
Figure 6 shows a G = 5 non-inverting amplifier implemented with the OPA703 and OPA704 op amps. It demonstrates the increased speed characteristics (bandwidth, slew rate and settling time) that can be achieved with the OPA704 family when used in gains of five or greater. Some optimization of feedback capacitor value may be required to achieve best dynamic response. Circuits with closed-loop gains of less than five should use the OPA703 family for good stability and capacitive load drive. The OPA703 can be used in gains greater than five, but will not provide the increased speed benefits of the OPA704 family.
The OPA703 series op amps are optimized for driving medium-speed sampling data converters. The OPA703 op amps buffer the converter’s input capacitance and resulting charge injection while providing signal gain.
Figure 7 shows the OPA2703 in a dual-supply buffered reference configuration for the DAC7644. The DAC7644 is a 16-bit, low-power, quad-voltage output converter. Small size makes the combination ideal for automatic test equip­ment, data acquisition systems, and other low-power space­limited applications.
OPA703, OPA704
SBOS180A
11
3pF
5k 20k
OPA703
V
IN
Demonstrates speed improvement that can be achieved with OPA704 family in applications with G 5.
G = 5
2V/div
5k 20k
V
IN
LARGE-SIGNAL RESPONSE
OPA703
OPA704
5µs/div
OPA704
G = 5
FIGURE 6. OPA704 Provides higher Speed in G 5.
48
NC
47
DAC7644
V
V
REF
V
REF
V
NC NC NC
A Sense
OUT
V
OUT
L AB Sense
V
L AB
REF
V
H AB
REF
H AB Sense
B Sense
OUT
V
OUT
46 45 44 43
A
42 41 40 39 38 37
B
+V
–2.5V
V–
Ref
Negative Reference
V
OUT
1/2
OPA2703
500pF
V+
500pF
V
OUT
1/2
OPA2703
+2.5V
Ref
Positive Reference
–V
FIGURE 7. OPA703 as Dual Supply Configuration-Buffered References for the DAC7644.
12
OPA703, OPA704
SBOS180A
PACKAGE OPTION ADDENDUM
www.ti.com
11-Nov-2003
PACKAGING INFORMATION
ORDERABLE DEVICE STATUS(1) PACKAGE TYPE PACKAGE DRAWING PINS PACKAGE QTY
OPA2703EA/250 ACTIVE VSSOP DGK 8 250
OPA2703EA/2K5 ACTIVE VSSOP DGK 8 2500
OPA2703PA ACTIVE PDIP P 8 50
OPA2703UA ACTIVE SOIC D 8 100 OPA2703UA/2K5 ACTIVE SOIC D 8 2500 OPA2704EA/250 ACTIVE VSSOP DGK 8 250 OPA2704EA/2K5 ACTIVE VSSOP DGK 8 2500
OPA2704PA ACTIVE PDIP P 8 50
OPA2704UA ACTIVE SOIC D 8 100 OPA2704UA/2K5 ACTIVE SOIC D 8 2500 OPA4703EA/250 ACTIVE TSSOP PW 14 250 OPA4703EA/2K5 ACTIVE TSSOP PW 14 2500
OPA4703UA ACTIVE SOIC D 14 58 OPA4703UA/2K5 ACTIVE SOIC D 14 2500 OPA4704EA/250 ACTIVE TSSOP PW 14 250 OPA4704EA/2K5 ACTIVE TSSOP PW 14 2500
OPA4704UA ACTIVE SOIC D 14 58 OPA4704UA/2K5 ACTIVE SOIC D 14 2500
OPA703NA/250 ACTIVE SOP DBV 5 250
OPA703NA/3K ACTIVE SOP DBV 5 3000
OPA703PA ACTIVE PDIP P 8 50
OPA703UA ACTIVE SOIC D 8 100 OPA703UA/2K5 ACTIVE SOIC D 8 2500 OPA704NA/250 ACTIVE SOP DBV 5 250
OPA704NA/3K ACTIVE SOP DBV 5 3000
OPA704PA ACTIVE PDIP P 8 50
OPA704UA ACTIVE SOIC D 8 100 OPA704UA/2K5 ACTIVE SOIC D 8 2500
(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.
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