OPA211_08 [TI]
1.1nV/☆Hz Noise, Low Power, Precision Operational Amplifier in Small DFN-8 Package; 1.1nV / Hz的☆噪声，低功耗，小型精密运算放大器DFN- 8封装
| 型号： | OPA211_08 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 1.1nV/☆Hz Noise, Low Power, Precision Operational Amplifier in Small DFN-8 Package |
| 文件： | 总17页 (文件大小：635K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
1.1nV/√Hz Noise, Low Power, Precision
Operational Amplifier in Small DFN-8 Package
1
FEATURES
DESCRIPTION
23
•
LOW VOLTAGE NOISE: 1.1nV/√Hz at 1kHz
The OPA211 series of precision operational
amplifiers achieves very low 1.1nV/√Hz noise density
with a supply current of only 3.6mA. This series also
offers rail-to-rail output swing, which maximizes
dynamic range.
•
INPUT VOLTAGE NOISE:
80nVPP (0.1Hz to 10Hz)
•
•
•
•
•
•
THD+N: –136dB (G = 1, f = 1kHz)
OFFSET VOLTAGE: 125µV (max)
OFFSET VOLTAGE DRIFT: 0.35µV/°C (typ)
LOW SUPPLY CURRENT: 3.6mA/Ch (typ)
UNITY GAIN STABLE
The extremely low voltage and low current noise,
high speed, and wide output swing of the OPA211
series make these devices an excellent choice as a
loop filter amplifier in PLL applications.
GAIN BANDWIDTH PRODUCT:
80MHz (G = 100)
45MHz (G = 1)
In precision data acquisition applications, the
OPA211 series of op amps provides 700ns settling
time to 16-bit accuracy throughout 10V output swings.
This ac performance, combined with only 125µV of
offset and 0.35µV/°C of drift over temperature, makes
the OPA211 ideal for driving high-precision 16-bit
analog-to-digital converters (ADCs) or buffering the
output of high-resolution digital-to-analog converters
(DACs).
•
•
•
SLEW RATE: 27V/µs
16-BIT SETTLING: 700ns
WIDE SUPPLY RANGE:
±2.25V to ±18V, +4.5V to +36V
•
•
•
RAIL-TO-RAIL OUTPUT
The OPA211 series is specified over
a wide
OUTPUT CURRENT: 30mA
DFN-8 (3×3mm), MSOP-8, AND SO-8
dual-power supply range of ±2.25V to ±18V, or
single-supply operation from +4.5V to +36V.
The OPA211 is available in the small DFN-8
(3×3mm), MSOP-8, and SO-8 packages. A dual
version, the OPA2211, is available in the DFN-8
(3×3mm) or an SO-8 PowerPAD™ package. This
series of op amps is specified from TA = –40°C to
+125°C.
APPLICATIONS
•
PLL LOOP FILTER
•
LOW-NOISE, LOW-POWER SIGNAL
PROCESSING
•
•
•
•
•
•
•
•
•
•
•
16-BIT ADC DRIVERS
DAC OUTPUT AMPLIFIER
ACTIVE FILTERS
LOW-NOISE INSTRUMENTATION AMPS
ULTRASOUND AMPLIFIERS
PROFESSIONAL AUDIO PREAMPLIFIERS
LOW-NOISE FREQUENCY SYNTHESIZERS
INFRARED DETECTOR AMPLIFIERS
HYDROPHONE AMPLIFIERS
GEOPHONE AMPLIFIERS
INPUT VOLTAGE NOISE DENSITY vs FREQUENCY
100
10
MEDICAL
1
0.1
1
10
100
1k
10k
100k
Frequency (Hz)
1
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.
2
3
PowerPAD is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2008, Texas Instruments Incorporated
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
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.
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range (unless otherwise noted).
VALUE
UNIT
V
Supply Voltage
VS = (V+) – (V–)
40
(V–) – 0.5 to (V+) + 0.5
±10
Input Voltage
V
Input Current (Any pin except power-supply pins)
Output Short-Circuit(2)
Operating Temperature
Storage Temperature
mA
Continuous
(TA)
(TA)
(TJ)
–55 to +150
–65 to +150
200
°C
°C
°C
V
Junction Temperature
Human Body Model (HBM)
ESD Ratings
3000
Charged Device Model (CDM)
1000
V
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not supported.
(2) Short-circuit to VS/2 (ground in symmetrical dual supply setups), one amplifier per package.
PACKAGE/ORDERING INFORMATION(1)
PACKAGE
DESIGNATOR
PACKAGE
MARKING
PRODUCT
PACKAGE-LEAD
SINGLE
SHUTDOWN
DUAL
Standard Grade
DFN-8 (3×3mm)(2)
ü
ü
ü
ü
DRG
DGK
OBDQ
OBCQ
OPA211AI
OPA211AI
MSOP-8(2)
A TI OPA
211
SO-8
ü
D
DFN-8 (3×3mm)(3)
SO-8 PowerPAD(3)
ü
ü
DRG
DDA
OBHQ
OPA2211AI
A TI OPA
2211
High Grade(3)
DFN-8 (3×3mm)
ü
ü
ü
ü
DRG
DGK
OBDQ
OBCQ
MSOP-8
OPA211I
TI OPA
211
SO-8
ü
D
DFN-8 (3×3mm)
SO-8 PowerPAD
ü
ü
DRG
DDA
OBHQ
OPA2211I
TI OPA
2211
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Available Q2, 2008.
(3) Available Q3, 2008.
2
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
PIN CONFIGURATIONS
OPA211
SO-8
OPA211
MSOP-8(4)
NC(1)
1
2
3
4
8
7
6
5
NC(1)
V+
NC(1)
1
2
3
4
8
7
6
5
Shutdown(3)
V+
-IN
+IN
V-
-IN
+IN
V-
OUT
NC(1)
OUT
NC(1)
OPA211(4)
DFN-8 (3×3mm)
OPA2211
DFN-8 (3×3mm)(5)
NC(1)
1
8
7
6
5
Shutdown(3)
V+
V+
OUT A
-IN A
+IN A
V-
1
2
3
4
8
7
6
5
-IN
+IN
V-
2
3
4
OUT B
-IN B
+IN B
A
OUT
B
NC(1)
Pad(2)
Pad(2)
OPA2211
SO-8 PowerPAD(5)
OUT A
1
8
7
6
5
V+
A
-IN A
+IN A
V-
2
3
4
OUT B
-IN B
+IN B
B
Pad(2)
(1) NC denotes no internal connection. Pin can be left floating or connected to any voltage between (V–) and (V+).
(2) Exposed thermal die pad on underside; connect thermal die pad to V–.
(3) Shutdown function:
•
•
Device enabled: (V–) ≤ VSHUTDOWN ≤ (V+) – 3V
Device disabled: VSHUTDOWN ≥ (V+) – 0.35V
(4) Available Q2, 2008.
(5) Available Q3, 2008.
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
3
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
ELECTRICAL CHARACTERISTICS: VS = ±2.25V to ±18V
BOLDFACE limits apply over the specified temperature range, TA = –40°C to +125°C.
At TA = +25°C and RL = 10kΩ, unless otherwise noted.
Standard Grade
OPA211A, OPA2211A
PARAMETER
CONDITIONS
VS = ±15V
MIN
TYP
MAX
UNIT
OFFSET VOLTAGE
Input Offset Voltage
Drift
VOS
dVOS/dT
PSRR
±30
0.35
0.1
±125
µV
µV/°C
µV/V
µV/V
vs Power Supply
VS = ±2.25V to ±18V
1
Over Temperature
3
INPUT BIAS CURRENT
Input Bias Current
Over Temperature
Offset Current
IB
VCM = 0V
VCM = 0V
±60
±25
±175
±200
±100
±150
nA
nA
nA
nA
IOS
Over Temperature
NOISE
Input Voltage Noise
en
f = 0.1Hz to 10Hz
f = 10Hz
80
2
nVPP
Input Voltage Noise Density
nV/√Hz
nV/√Hz
nV/√Hz
pA/√Hz
pA/√Hz
f = 100Hz
f = 1kHz
1.4
1.1
3.2
1.7
Input Current Noise Density
in
f = 10Hz
f = 1kHz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
VCM
V
S ≥ ±5V
(V–) + 1.8
(V–) + 2
114
(V+) – 1.4
(V+) – 1.4
V
V
VS < ±5V
Common-Mode Rejection Ratio
CMRR
V
S ≥ ±5V, (V–) + 2V ≤ VCM ≤ (V+) – 2V
120
120
dB
dB
VS < ±5V, (V–) + 2V ≤ VCM ≤ (V+) – 2V
110
INPUT IMPEDANCE
Differential
20k || 8
109 || 2
Ω || pF
Ω || pF
Common-Mode
OPEN-LOOP GAIN
Open-Loop Voltage Gain
AOL
AOL
AOL
AOL
(V–) + 0.2V ≤ VO ≤ (V+) – 0.2V,
RL = 10kΩ
114
110
110
103
130
dB
dB
dB
dB
(V–) + 0.6V ≤ VO ≤ (V+) – 0.6V,
RL = 600Ω
114
Over Temperature
(V–) + 0.6V ≤ VO ≤ (V+) – 0.6V,
IO ≤ 15mA
(V–) + 0.6V ≤ VO ≤ (V+)–0.6V
15mA ≤ IO ≤ 30mA
FREQUENCY RESPONSE
Gain-Bandwidth Product
GBW
G = 100
G = 1
80
45
MHz
MHz
V/µs
ns
Slew Rate
SR
tS
27
Settling Time, 0.01%
0.0015% (16-bit)
VS = ±15V, G = –1, 10V Step, CL = 100pF
VS = ±15V, G = –1, 10V Step, CL = 100pF
G = –10
400
700
500
ns
Overload Recovery Time
Total Harmonic Distortion + Noise
ns
THD+N
G = +1, f = 1kHz,
VO = 3VRMS, RL = 600Ω
0.000015
–136
%
dB
4
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
ELECTRICAL CHARACTERISTICS: VS = ±2.25V to ±18V (continued)
BOLDFACE limits apply over the specified temperature range, TA = –40°C to +125°C.
At TA = +25°C and RL = 10kΩ, unless otherwise noted.
Standard Grade
OPA211A, OPA2211A
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
OUTPUT
Voltage Output
VOUT
RL = 10kΩ, AOL ≥ 114dB
RL = 600Ω, AOL ≥ 110dB
IO < 25mA, AOL ≥ 110dB
(V–) + 0.2
(V–) + 0.6
(V–) + 0.6
(V+) – 0.2
(V+) – 0.6
(V+) – 0.6
V
V
V
Short-Circuit Current
Capacitive Load Drive
ISC
CLOAD
ZO
+30/–45
mA
pF
Ω
See Typical Characteristics
5
Open-Loop Output Impedance
SHUTDOWN
1MHz
Shutdown Pin Input Voltage
Device shutdown
Device enabled
(V+) – 0.35
±2.25
V
V
(V+) – 3
POWER SUPPLY
Specified Voltage
VS
IQ
±18
4.5
6
V
Quiescent Current
(per channel)
IOUT = 0A
3.6
mA
mA
Over Temperature
TEMPERATURE RANGE
Specified Range
TA
TA
–40
–55
+125
+150
°C
°C
Operating Range
Thermal Resistance
Soldered to approximately
5cm × 5cm copper area
DFN (3mm × 3mm)
θ
65
°C/W
JA
θ
57
°C/W
°C/W
°C/W
JC
MSOP-8
SO-8
θ
200
150
JA
θ
JA
Test board 1in × 0.5in heat-spreader,
SO-8 PowerPAD
θ
52
43
°C/W
°C/W
JA
1oz copper
θ
JC
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = ±18V, and RL = 10kΩ, unless otherwise noted.
INPUT VOLTAGE NOISE DENSITY
vs FREQUENCY
INPUT CURRENT NOISE DENSITY
vs FREQUENCY
100
10
1
100
10
1
0.1
1
10
100
1k
10k
100k
0.1
1
10
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
Figure 1.
Figure 2.
THD+N RATIO vs AMPLITUDE
THD+N RATIO vs FREQUENCY
0.001
-100
1
-40
VS = ±15V
RL = 600W
VS = ±15V
RL = 600W
1kHz Signal
0.1
-60
0.01
0.001
-80
0.0001
-120
G = 11
G = 1
G = 11
VOUT = 3VRMS
-100
-120
0.0001
G = 1
VOUT = 3VRMS
0.00001
-140
0.00001
-140
0.01
0.1
1
10
100
10
100
1k
Frequency (Hz)
Figure 3.
10k 20k
Amplitude (VRMS
)
Figure 4.
0.1Hz TO 10Hz NOISE
Time (1s/div)
Figure 5.
6
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, and RL = 10kΩ, unless otherwise noted.
POWER-SUPPLY REJECTION RATIO
vs FREQUENCY (Referred to Input)
COMMON-MODE REJECTION RATIO
vs FREQUENCY
160
140
120
100
80
140
120
100
-PSRR
80
+PSRR
60
60
40
40
20
0
20
0
1
10
100
1k
10k 100k
1M
10M 100M
10k
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
Figure 6.
Figure 7.
OPEN-LOOP OUTPUT IMPEDANCE
vs FREQUENCY
GAIN AND PHASE vs FREQUENCY
10k
1k
140
120
100
80
180
135
90
45
0
Phase
100
60
10
1
40
Gain
20
0
0.1
-20
10
100
1k
10k
100k
1M
10M
100M
100
1k
10k
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
Figure 8.
Figure 9.
OPEN-LOOP GAIN vs TEMPERATURE
5
RL = 10kW
4
3
2
300mV Swing From Rails
200mV Swing From Rails
1
0
-1
-2
-3
-4
-5
-75 -50 -25
0
25 50 75 100 125 150 175 200
Temperature (°C)
Figure 10.
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
7
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, and RL = 10kΩ, unless otherwise noted.
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
Offset Voltage Drift (mV/°C)
Offset Voltage (mV)
Figure 11.
Figure 12.
OFFSET VOLTAGE vs COMMON-MODE VOLTAGE
VOS WARMUP
12
10
8
2000
20 Typical Units Shown
1500
1000
500
6
4
2
0
0
-2
-4
-6
-8
-10
-12
-500
-1000
-1500
-2000
0
10
20
30
40
50
60
(V-)+1.0 (V-)+1.5 (V-)+2.0
(V+)-1.5 (V+)-1.0 (V+)-0.5
VCM (V)
Time (s)
Figure 13.
Figure 14.
INPUT OFFSET CURRENT vs SUPPLY VOLTAGE
INPUT OFFSET CURRENT vs COMMON-MODE VOLTAGE
100
VS = 36V
100
80
5 Typical Units Shown
75
50
3 Typical Units Shown
60
40
25
20
0
0
-20
-40
-60
-80
-100
-25
-50
-75
-100
Common-Mode Range
1
5
10
15
20
25
30
35
2.25
4
6
8
10
12
14
16
18
VS (±V)
VCM (V)
Figure 15.
Figure 16.
8
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, and RL = 10kΩ, unless otherwise noted.
INPUT BIAS CURRENT vs SUPPLY VOLTAGE
INPUT BIAS CURRENT vs COMMON-MODE VOLTAGE
150
150
-IB
3 Typical Units Shown
VS = 36V
3 Typical Units Shown
+IB
100
100
50
Unit 1
Unit 2
50
0
Unit 1
Unit 2
0
Unit 3
-50
-100
-150
-50
-100
-150
Unit 3
Common-Mode Range
-IB
+IB
1
2.25
4
6
8
10
12
14
16
18
5
10
15
20
25
30
35
VS (±V)
VCM (V)
Figure 17.
Figure 18.
QUIESCENT CURRENT vs SUPPLY VOLTAGE
QUIESCENT CURRENT vs TEMPERATURE
6
5
4
3
2
1
0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
4
8
12
16
20
24
28
32
36
-75 -50 -25
0
25 50 75 100 125 150 175 200
VS (V)
Temperature (°C)
Figure 19.
Figure 20.
NORMALIZED QUIESCENT CURRENT
vs TIME
SHORT-CIRCUIT CURRENT vs TEMPERATURE
60
50
0.05
0
40
30
Sourcing
-0.05
-0.10
-0.15
-0.20
-0.25
-0.30
20
10
0
-10
-20
-30
-40
-50
-60
Sinking
Average of 10 Typical Units
-75 -50 -25
0
25 50 75 100 125 150 175 200
0
60 120 180 240 300 360 420 480 540 600
Time (s)
Temperature (°C)
Figure 21.
Figure 22.
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
9
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, and RL = 10kΩ, unless otherwise noted.
SMALL-SIGNAL STEP RESPONSE
(100mV)
SMALL-SIGNAL STEP RESPONSE
(100mV)
G = -1
G = -1
RL = 600W
RL = 600W
CL = 10pF
CL = 100pF
CF
CF
5.6pF
5.6pF
RF
RI
RF
RI
604W
604W
604W
604W
+18V
+18V
OPA211
-18V
OPA211
CL
RL
CL
RL
-18V
Time (0.1ms/div)
Time (0.1ms/div)
Figure 23.
Figure 24.
SMALL-SIGNAL STEP RESPONSE
(100mV)
SMALL-SIGNAL STEP RESPONSE
(100mV)
G = +1
RL = 600W
G = +1
RL = 600W
CL = 10pF
CL = 100pF
+18V
OPA211
-18V
+18V
OPA211
-18V
RL
CL
RL
CL
Time (0.1ms/div)
Time (0.1ms/div)
Figure 25.
Figure 26.
SMALL-SIGNAL OVERSHOOT
vs CAPACITIVE LOAD (100mV Output Step)
60
50
40
30
20
10
0
G = +1
G = -1
G = 10
0
200
400
600
800
1000 1200 1400
Capacitive Load (pF)
Figure 27.
10
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, and RL = 10kΩ, unless otherwise noted.
LARGE-SIGNAL STEP RESPONSE
LARGE-SIGNAL STEP RESPONSE
G = +1
CL = 100pF
G = -1
CL = 100pF
RL = 600W
RF = 0W
RL = 600W
RF = 100W
Note: See the
Applications Information
section, Input Protection.
Time (0.5ms/div)
Time (0.5ms/div)
Figure 28.
Figure 29.
LARGE-SIGNAL POSITIVE SETTLING TIME
(10VPP, CL = 100pF)
LARGE-SIGNAL POSITIVE SETTLING TIME
(10VPP, CL = 10pF)
1.0
0.8
0.010
0.008
0.006
0.004
0.002
0
1.0
0.8
0.010
0.008
0.006
0.004
0.002
0
0.6
0.6
0.4
0.4
0.2
0.2
16-Bit
Settling
16-Bit
Settling
0
0
-0.2
-0.4
-0.6
-0.8
-1.0
-0.002
-0.004
-0.006
-0.008
-0.010
-0.2
-0.4
-0.6
-0.8
-1.0
-0.002
-0.004
-0.006
-0.008
-0.010
(±0.0015%)
(±0.0015%)
0
100 200 300 400 500 600 700 800 900 1000
Time (ns)
0
100 200 300 400 500 600 700 800 900 1000
Time (ns)
Figure 30.
Figure 31.
LARGE-SIGNAL NEGATIVE SETTLING TIME
(10VPP, CL = 100pF)
LARGE-SIGNAL NEGATIVE SETTLING TIME
(10VPP, CL = 10pF)
1.0
0.8
1.0
0.8
0.010
0.010
0.008
0.006
0.004
0.002
0
0.008
0.006
0.004
0.002
0
0.6
0.6
0.4
0.4
0.2
0.2
16-Bit
Settling
16-Bit
Settling
0
0
-0.2
-0.4
-0.6
-0.8
-1.0
-0.002
-0.004
-0.006
-0.008
-0.010
-0.2
-0.4
-0.6
-0.8
-1.0
-0.002
-0.004
-0.006
-0.008
-0.010
(±0.0015%)
(±0.0015%)
0
100 200 300 400 500 600 700 800 900 1000
Time (ns)
0
100 200 300 400 500 600 700 800 900 1000
Time (ns)
Figure 32.
Figure 33.
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, and RL = 10kΩ, unless otherwise noted.
NEGATIVE OVERLOAD RECOVERY
POSITIVE OVERLOAD RECOVERY
G = -10
G = -10
VIN
10kW
VOUT
1kW
0V
10kW
1kW
VOUT
OPA211
VIN
VOUT
OPA211
VIN
0V
VOUT
VIN
Time (0.5ms/div)
Time (0.5ms/div)
Figure 34.
Figure 35.
OUTPUT VOLTAGE vs OUTPUT CURRENT
NO PHASE REVERSAL
20
15
0°C
Output
+85°C
+125°C
-55°C
10
5
+125°C
0
+150°C
0°C
-5
+18V
OPA211
-10
-15
-20
Output
+85°C
37VPP
-18V
(±18.5V)
0.5ms/div
0
10
20
30
40
50
60
70
IOUT (mA)
Figure 36.
Figure 37.
12
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
APPLICATION INFORMATION
negative output voltage swing. With the OPA211
series, power-supply voltages do not need to be
equal. For example, the positive supply could be set
to +25V with the negative supply at –5V or
vice-versa.
The OPA211 and OPA2211 are unity-gain stable,
precision op amps with very low noise. Applications
with noisy or high impedance power supplies require
decoupling capacitors close to the device pins. In
most cases, 0.1µF capacitors are adequate.
Figure 38 shows a simplified schematic of the
OPA211. This die uses a SiGe bipolar process and
contains 180 transistors.
The common-mode voltage must be maintained
within the specified range. In addition, key
parameters are assured over the specified
temperature range, TA
=
–40°C to +125°C.
Parameters that vary significantly with operating
voltage or temperature are shown in the Typical
Characteristics.
OPERATING VOLTAGE
OPA211 series op amps operate from ±2.25V to
±18V
supplies
while
maintaining
excellent
performance. The OPA211 series can operate with as
little as +4.5V between the supplies and with up to
+36V between the supplies. However, some
applications do not require equal positive and
V+
Pre-Output Driver
OUT
IN+
IN-
V-
Figure 38. OPA211 Simplified Schematic
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
13
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
INPUT PROTECTION
VOLTAGE NOISE SPECTRAL DENSITY
vs SOURCE RESISTANCE
The input terminals of the OPA211 are protected from
excessive differential voltage with back-to-back
diodes, as shown in Figure 39. In most circuit
applications, the input protection circuitry has no
consequence. However, in low-gain or G = 1 circuits,
fast ramping input signals can forward bias these
diodes because the output of the amplifier cannot
respond rapidly enough to the input ramp. This effect
is illustrated in Figure 29 of the Typical
Characteristics. If the input signal is fast enough to
create this forward bias condition, the input signal
current must be limited to 10mA or less. If the input
signal current is not inherently limited, an input series
resistor can be used to limit the signal input current.
This input series resistor degrades the low noise
performance of the OPA211. See the Noise
Performance section of this data sheet for further
information on noise calculation. Figure 39 shows an
example implementing a current-limiting feedback
resistor.
10k
1k
EO
RS
OPA227
OPA211
100
10
1
Resistor Noise
EO2 = en2 + (in RS)2 + 4kTRS
100
1k
10k
100k
10M
Source Resistance, RS (W)
Figure 40. Noise Performance of the OPA211 in
Unity-Gain Buffer Configuration
BASIC NOISE CALCULATIONS
RF
Design of low-noise op amp circuits requires careful
consideration of
a
variety of possible noise
contributors: noise from the signal source, noise
generated in the op amp, and noise from the
feedback network resistors. The total noise of the
circuit is the root-sum-square combination of all noise
components.
-
OPA211
Output
RI
+
Input
The resistive portion of the source impedance
produces thermal noise proportional to the square
root of the resistance. This function is plotted in
Figure 40. The source impedance is usually fixed;
consequently, select the op amp and the feedback
resistors to minimize the respective contributions to
the total noise.
Figure 39. Pulsed Operation
NOISE PERFORMANCE
Figure 40 depicts total noise for varying source
Figure 40 shows total circuit noise for varying source
impedances with the op amp in unity-gain
impedances with the op amp in
a unity-gain
a
configuration (no feedback resistor network, and
therefore no additional noise contributions). The
operational amplifier itself contributes both a voltage
noise component and a current noise component.
The voltage noise is commonly modeled as a
time-varying component of the offset voltage. The
current noise is modeled as the time-varying
component of the input bias current and reacts with
the source resistance to create a voltage component
of noise. Therefore, the lowest noise op amp for a
given application depends on the source impedance.
For low source impedance, current noise is negligible
and voltage noise generally dominates. For high
source impedance, current noise may dominate.
configuration (no feedback resistor network, and
therefore no additional noise contributions). Two
different op amps are shown with total circuit noise
calculated. The OPA211 has very low voltage noise,
making it ideal for low source impedances (less than
2kΩ). A similar precision op amp, the OPA227, has
somewhat higher voltage noise but lower current
noise. It provides excellent noise performance at
moderate source impedance (10kΩ to 100kΩ). Above
100kΩ, a FET-input op amp such as the OPA132
(very low current noise) may provide improved
performance. The equation in Figure 40 is shown for
the calculation of the total circuit noise. Note that en =
voltage noise, in = current noise, RS = source
impedance, k = Boltzmann’s constant = 1.38 × 10–23
J/K, and T is temperature in K. For more details on
calculating noise, see the Basic Noise Calculations
section.
14
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
Figure 41 illustrates both inverting and noninverting
op amp circuit configurations with gain. In circuit
configurations with gain, the feedback network
resistors also contribute noise. The current noise of
the op amp reacts with the feedback resistors to
create additional noise components. The feedback
resistor values can generally be chosen to make
these noise sources negligible. The equations for
total noise are shown for both configurations.
feedback factor or noise gain of the circuit. The
closed-loop gain is unchanged, but the feedback
available for error correction is reduced by a factor of
101, thus extending the resolution by 101. Note that
the input signal and load applied to the op amp are
the same as with conventional feedback without R3.
The value of R3 should be kept small to minimize its
effect on the distortion measurements.
Validity of this technique can be verified by
duplicating measurements at high gain and/or high
frequency where the distortion is within the
measurement capability of the test equipment.
Measurements for this data sheet were made with an
Audio Precision System Two distortion/noise
analyzer, which greatly simplifies such repetitive
measurements. The measurement technique can,
however, be performed with manual distortion
measurement instruments.
TOTAL HARMONIC DISTORTION
MEASUREMENTS
OPA211 series op amps have excellent distortion
characteristics. THD + Noise is below 0.0001% (G =
+1, VO = 3VRMS) throughout the audio frequency
range, 20Hz to 20kHz, with a 600Ω load.
The distortion produced by OPA211 series op amps
is below the measurement limit of many commercially
available equipment. However, a special test circuit
illustrated in Figure 42 can be used to extend the
measurement capabilities.
Op amp distortion can be considered an internal error
source that can be referred to the input. Figure 42
shows a circuit that causes the op amp distortion to
be 101 times greater than normally produced by the
op amp. The addition of R3 to the otherwise standard
noninverting amplifier configuration alters the
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
15
Product Folder Link(s): OPA211 OPA2211
OPA211
OPA2211
www.ti.com
SBOS377D–OCTOBER 2006–REVISED FEBRUARY 2008
Noise in Noninverting Gain Configuration
Noise at the output:
R2
2
2
R2
R2
2
EO
R1
=
1 +
en2 + e12 + e22 + (inR2)2 + eS2 + (inRS)2 1 +
R1
R1
EO
R2
Where eS = Ö4kTRS
e1 = Ö4kTR1
´
= thermal noise of RS
1 +
R1
RS
R2
R1
´
= thermal noise of R1
VS
e2 = Ö4kTR2 = thermal noise of R2
Noise in Inverting Gain Configuration
Noise at the output:
R2
2
R2
2
EO
2
=
1 +
en2 + e12 + e22 + (inR2)2 + eS
R1
R1 + RS
EO
RS
R2
Where eS = Ö4kTRS
´
= thermal noise of RS
= thermal noise of R1
R1 + RS
VS
R2
e1 = Ö4kTR1
´
R1 + RS
e2 = Ö4kTR2 = thermal noise of R2
For the OPA211 series op amps at 1kHz, en = 1.1nV/ÖHz and in = 1.7pA/ÖHz.
Figure 41. Noise Calculation in Gain Configurations
R1
R2
SIG. DIST.
GAIN GAIN
R1
R2
1kW
R3
1
101
¥
10W
11W
R3
OPA211
VO = 3VRMS
11
101 100W 1kW
R2
R1
Signal Gain = 1+
R2
Distortion Gain = 1+
R1 II R3
Generator
Output
Analyzer
Input
Audio Precision
System Two(1)
RL
600W
with PC Controller
NOTE: (1) Measurement BW = 80kHz.
Figure 42. Distortion Test Circuit
16
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA211 OPA2211
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 and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Audio
Automotive
Broadband
Digital Control
Medical
Amplifiers
Data Converters
DSP
Clocks and Timers
Interface
amplifier.ti.com
dataconverter.ti.com
dsp.ti.com
www.ti.com/clocks
interface.ti.com
logic.ti.com
www.ti.com/audio
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/medical
www.ti.com/military
Logic
Military
Power Mgmt
Microcontrollers
RFID
power.ti.com
microcontroller.ti.com
www.ti-rfid.com
Optical Networking
Security
Telephony
Video & Imaging
Wireless
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
RF/IF and ZigBee® Solutions www.ti.com/lprf
www.ti.com/wireless
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2008, Texas Instruments Incorporated
相关型号：
©2020 ICPDF网 联系我们和版权申明