OPA2357 [BB]
250MHz, Rail-to-Rail I/O, CMOS Operational Amplifier with Shutdown; 250MHz轨至轨I / O， CMOS具有关断运算放大器
| 型号： | OPA2357 |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | 250MHz, Rail-to-Rail I/O, CMOS Operational Amplifier with Shutdown |
| 文件： | 总23页 (文件大小：422K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OPA357
OPA2357
SBOS235C − MARCH 2002− REVISED MAY 2004
250MHz, Rail-to-Rail I/O, CMOS
Operational Amplifier with Shutdown
FEATURES
DESCRIPTION
The OPA357 series of high-speed, voltage-feedback
CMOS operational amplifiers are designed for video and
other applications requiring wide bandwidth. They are
unity-gain stable and can drive large output currents.
Differential gain is 0.02% and differential phase is 0.09°.
Quiescent current is only 4.9mA per channel.
D
D
D
D
D
D
D
UNITY-GAIN BANDWIDTH: 250MHz
WIDE BANDWIDTH: 100MHz GBW
HIGH SLEW RATE: 150V/ms
LOW NOISE: 6.5nV/√Hz
RAIL-TO-RAIL I/O
The OPA357 series op amps are optimized for operation
on single or dual supplies as low as 2.5V ( 1.25V) and up
to 5.5V ( 2.75V). Common-mode input range extends
beyond the supplies. The output swing is within 100mV of
the rails, supporting wide dynamic range.
HIGH OUTPUT CURRENT: > 100mA
EXCELLENT VIDEO PERFORMANCE:
Diff Gain: 0.02%, Diff Phase: 0.095
0.1dB Gain Flatness: 40MHz
D
D
D
D
D
D
LOW INPUT BIAS CURRENT: 3pA
QUIESCENT CURRENT: 4.9mA
THERMAL SHUTDOWN
For applications requiring the full 100mA continuous
output current, the single SO-8 PowerPAD version is
available.
The single version (OPA357), comes in the miniature
SOT23-6 and SO-8 PowerPAD packages. The dual
version (OPA2357) is offered in the MSOP-10 package.
SUPPLY RANGE: 2.5V to 5.5V
SHUTDOWN I < 6mA
Q
MicroSIZE AND PowerPAD PACKAGES
The dual version features completely independent
circuitry for lowest crosstalk and freedom from interaction.
All are specified over the extended −40°C to +125°C
temperature range.
APPLICATIONS
OPAx357 RELATED PRODUCTS
FEATURES
D
D
D
D
D
D
D
VIDEO PROCESSING
PRODUCT
OPAx354
ULTRASOUND
Non-Shutdown Version of OPA357 Family
OPTICAL NETWORKING, TUNABLE LASERS
PHOTODIODE TRANSIMPEDANCE AMPS
ACTIVE FILTERS
200MHz GBW, Rail-to-Rail Output, CMOS, Shutdown OPAx355
200MHz GBW, Rail-to-Rail Output, CMOS
38MHz GBW, Rail-to-Rail Input/Output, CMOS
75MHz BW G = 2, Rail-to-Rail Output
OPAx356
OPAx350/3
OPAx631
OPAx634
THS412x
HIGH-SPEED INTEGRATORS
ANALOG-TO-DIGITAL (A/D) CONVERTER
INPUT BUFFERS
150MHz BW G = 2, Rail-to-Rail Output
100MHz BW, Differential Input/Output, 3.3V Supply
D
DIGITAL-TO-ANALOG (D/A) CONVERTER
OUTPUT AMPLIFIERS
D
BARCODE SCANNERS
COMMUNICATIONS
V+
D
−
VIN
VOUT
OPA357
+VIN
−
V
Enable
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.
All trademarks are the property of their respective owners.
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ꢀꢎ ꢍ ꢙꢔꢓ ꢑ ꢊꢍ ꢋ ꢖꢎ ꢍ ꢓ ꢕ ꢒ ꢒ ꢊꢋ ꢟ ꢙꢍ ꢕ ꢒ ꢋꢍꢑ ꢋꢕ ꢓꢕ ꢒꢒ ꢐꢎ ꢊꢘ ꢞ ꢊꢋꢓ ꢘꢔꢙ ꢕ ꢑꢕ ꢒꢑꢊ ꢋꢟ ꢍꢌ ꢐꢘ ꢘ ꢖꢐ ꢎ ꢐꢏ ꢕꢑꢕ ꢎ ꢒꢚ
Copyright 2002-2004, Texas Instruments Incorporated
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SBOS235C − MARCH 2002− REVISED MAY 2004
(1)
ABSOLUTE MAXIMUM RATINGS
ELECTROSTATIC
Supply Voltage, V+ to V− . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5V
DISCHARGE SENSITIVITY
(2)
Signal Input Terminals Voltage
. . . (V−) − (0.5V) to (V+) + (0.5V)
. . . . . . . . . . . . . . . . . . . . . 10mA
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.
(2)
Current
Enable Input . . . . . . . . . . . . . . . . . . . . (V−) − (0.5V) to (V+) + (0.5V)
(3)
Output Short-Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . −55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Lead Temperature (soldering, 10s) . . . . . . . . . . . . . . . . . . . . . +300°C
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.
(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)
(3)
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.
Short-circuit to ground, one amplifier per package.
(1)
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESIGNATOR
PACKAGE
MARKING
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
PRODUCT
PACKAGE−LEAD
(1)
OPA357
SO-8 PowerPAD
DDA
−40°C to +125°C
OPA357A
OPA357AIDDA
Rails, 97
″
″
″
″
″
OPA357AIDDAR
Tape and Reel, 2500
OPA357
SOT23-6
DBV
″
−40°C to +125°C
OADI
″
OPA357AIDBVT
OPA357AIDBVR
Tape and Reel, 250
Tape and Reel, 3000
″
″
″
OPA2357
MSOP-10
DGS
−40°C to +125°C
BBG
OPA2357AIDGST
Tape and Reel, 250
″
″
″
″
″
OPA2357AIDGSR Tape and Reel, 2500
(1)
For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet.
PIN CONFIGURATION
Top View
OPA357
OPA357
OPA2357
NC(2)
1
2
3
4
8
7
6
5
Enable
V+
Out A
1
2
3
4
5
10 V+
Out
1
2
3
6
5
4
V+
−
−
In A
9
8
7
6
Out B
−
In
V
Enable
A
−
Out
+In A
In B
−
+In
+In
In
B
NC(2)
+In B
−
V
−
V
SOT23(1)
Enable A
Enable B
SO PowerPAD(3)
MSOP−10
NOTES: (1) Pin 1 of the SOT23-6 is determined by orienting the package marking as indicated in the diagram.
(2) NC means no internal connection.
(3) PowerPAD should be connected to V− or left floating.
2
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SBOS235C − MARCH 2002− REVISED MAY 2004
ELECTRICAL CHARACTERISTICS: V = +2.7V to +5.5V Single-Supply
S
Boldface limits apply over the temperature range, T = −40°C to +125°C.
A
All specifications at T = +25°C, R = 0Ω , R = 1kΩ connected to V /2, unless otherwise noted.
A
F
L
S
OPA357AI
OPA2357AI
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE
Input Offset Voltage
V
V
= +5V
2
8
mV
mV
OS
S
Specified Temperature Range
Specified Temperature Range
+10
vs Temperature
dV /dT
OS
+4
µV/°C
µV/V
µV/V
vs Power Supply
PSRR
V
= +2.7V to +5.5V, V
CM
Specified Temperature Range
= (V /2) − 0.15V
200
800
S
S
900
INPUT BIAS CURRENT
Input Bias Current
I
3
1
50
50
pA
pA
B
Input Offset Current
I
OS
NOISE
Input Voltage Noise Density
Current Noise Density
e
i
f = 1MHz
f = 1MHz
6.5
50
nV/√Hz
fA/√Hz
n
n
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
V
(V−) − (0.1)
(V+) + (0.1V)
V
CM
CMRR
V
= +5.5V, −0.1V < V
CM
< +3.5V
66
64
56
55
80
68
dB
dB
dB
dB
S
Specified Temperature Range
= +5.5V, −0.1V < V < +5.6V
V
S
CM
Specified Temperature Range
INPUT IMPEDANCE
Differential
13
10 || 2
Ω || pF
Ω || pF
13
Common-Mode
10 || 2
OPEN-LOOP GAIN
A
V
= +5V, +0.3V < V < +4.7V
94
110
dB
OL
S
O
Specified Temperature Range
V
= +5V, +0.4V < V < +4.6V
90
dB
S
O
FREQUENCY RESPONSE
Small-Signal Bandwidth
f
f
G = +1, V = 100mV , R = 25Ω
250
90
MHz
MHz
MHz
MHz
V/µs
V/µs
V/µs
ns
−3dB
O
PP
F
G = +2, V = 100mV
O
−3dB
PP
Gain-Bandwidth Product
GBW
G = +10
100
40
Bandwidth for 0.1dB Gain Flatness
Slew Rate
f
G = +2, V = 100mV
O PP
0.1dB
SR
V
V
V
= +5V, G = +1, 4V Step
= +5V, G = +1, 2V Step
= +3V, G = +1, 2V Step
150
130
110
2
S
S
S
Rise-and-Fall Time
G = +1, V = 200mV , 10% to 90%
O
PP
G = 1, V = 2V , 10% to 90%
11
ns
O
PP
Settling Time, 0.1%
0.01%
V
= +5V, G = +1, 2V Output Step
30
ns
S
60
ns
Overload Recovery Time
Harmonic Distortion
2nd-Harmonic
V
S Gain = V
5
ns
IN
S
G = +1, f = 1MHz, V = 2V , R = 200Ω, V
PP
= 1.5V
= 1.5V
−75
−83
dBc
dBc
O
L
CM
CM
3rd-Harmonic
G = +1, f = 1MHz, V = 2V , R = 200Ω, V
O
PP
L
Differential Gain Error
Differential Phase Error
Channel-to-Channel Crosstalk, OPA2357
NTSC, R = 150Ω
0.02
0.09
−100
%
L
NTSC, R = 150Ω
degrees
dB
L
f = 5MHz
OUTPUT
Voltage Output Swing from Rail
V
= +5V, R = 1kΩ, A
> 94dB
0.1
0.3
V
V
S
L
OL
Specified Temperature Range
V
= +5V, R = 1kΩ, A
> 90dB
0.4
S
L
OL
(1)(2)
Output Current
, Single, Dual
I
V
= +5V
= +3V
100
mA
mV
Ω
O
S
S
V
50
0.05
35
Closed-Loop Output Impedance
Open-Loop Output Resistance
f < 100kHz
R
Ω
O
(1)
(2)
See typical characteristics Output Voltage Swing vs Output Current.
Specified by design.
3
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SBOS235C − MARCH 2002− REVISED MAY 2004
ELECTRICAL CHARACTERISTICS: V = +2.7V to +5.5V Single-Supply (continued)
S
Boldface limits apply over the temperature range, T = −40°C to +125°C.
A
All specifications at T = +25°C, R = 0Ω , R = 1kΩ connected to V /2, unless otherwise noted.
A
F
L
S
OPA357AI
OPA2357AI
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY
Specified Voltage Range
V
2.7
5.5
V
V
S
Operating Voltage Range
Quiescent Current (per amplifier)
2.5 to 5.5
4.9
I
V
= +5V, Enabled, I = 0
6
mA
mA
Q
S
O
Specified Temperature Range
7.5
ENABLE/SHUTDOWN FUNCTION
Disabled (logic−LOW Threshold)
Enabled (logic−HIGH Threshold)
Logic Input Current
0.8
V
V
2
Logic LOW
200
100
30
nA
ns
ns
dB
µA
Turn-On Time
Turn-Off Time
Off Isolation
G = +1, 5MHz, R = 10Ω
74
L
Quiescent Current (per amplifier)
3.4
6
THERMAL SHUTDOWN
Junction Temperature
Shutdown
T
J
+160
+140
°C
°C
Reset from Shutdown
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
SOT23-6
−40
−55
−65
+125
+150
+150
°C
°C
°C
°C/W
°C/W
°C/W
°C/W
q
JA
150
65
SO-8 PowerPAD
MSOP-10
150
(1)
(2)
See typical characteristics Output Voltage Swing vs Output Current.
Specified by design.
4
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SBOS235C − MARCH 2002− REVISED MAY 2004
TYPICAL CHARACTERISTICS
At T = +25°C, V = 5V, G = +1, R = 0Ω, R = 1kΩ, and connected to V /2, unless otherwise noted.
A
S
F
L
S
INVERTING SMALL−SIGNAL
FREQUENCY RESPONSE
NONINVERTING SMALL−SIGNAL
FREQUENCY RESPONSE
3
0
3
6
9
3
0
3
6
9
G = +1
RF = 25Ω
Ω
VO = 0.1VPP, RF = 604
VO = 0.1VPP
Ω
G = +2, RF = 604
−
−
−
−
−
−
−
G =
G =
1
G = +5, RF = 604Ω
Ω
−
−
2
G = +10, RF = 604
G =
5
−
G = 10
−
−
12
−
−
12
15
100k
15
100k
1M
10M
100M
1G
1M
10M
Frequency (Hz)
100M
1G
Frequency (Hz)
NONINVERTING SMALL−SIGNAL STEP RESPONSE
NONINVERTING LARGE−SIGNAL STEP RESPONSE
Time (20ns/div)
Time (20ns/div)
0.1dB GAIN FLATNESS
VO = 0.1VPP
0.5
0.4
0.3
0.2
0.1
0
LARGE−SIGNAL DISABLE/ENABLE RESPONSE
G = +1
Enabled
Ω
RF = 25
4.5
3.5
2.5
1.5
0.5
−
−
−
−
−
0.1
0.2
0.3
0.4
0.5
G = +2
Disabled
Ω
RF = 604
VOUT
fIN = 5MHz
100k
1M
10M
100M
1G
Time (200ns/div)
Frequency (Hz)
5
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SBOS235C − MARCH 2002− REVISED MAY 2004
TYPICAL CHARACTERISTICS (continued)
At T = +25°C, V = 5V, G = +1, R = 0Ω, R = 1kΩ, and connected to V /2, unless otherwise noted.
A
S
F
L
S
HARMONIC DISTORTION vs OUTPUT VOLTAGE
HARMONIC DISTORTION vs NONINVERTING GAIN
−
−
−
−
−
50
60
70
80
90
−
−
−
−
−
50
60
70
80
90
−
G =
1
VO = 2VPP
f = 1MHz
f = 1MHz
RL = 200
Ω
Ω
RL = 200
2nd−Harmonic
2nd−Harmonic
3rd−Harmonic
3rd−Harmonic
3
−
100
−
100
0
1
2
4
1
10
Output Voltage (VPP
)
Gain (V/V)
HARMONIC DISTORTION vs INVERTING GAIN
HARMONIC DISTORTION vs FREQUENCY
−
−
−
−
−
−
50
60
70
80
90
50
60
70
80
90
G = +1
VO = 2VPP
VO = 2VPP
f = 1MHz
Ω
−
RL = 200
Ω
RL = 200
V
CM = 1.5V
−
−
−
2nd−Harmonic
2nd−Harmonic
3rd−Harmonic
3rd−Harmonic
−
−
100
100
100k
1M
Frequency (Hz)
10M
1
10
Gain (V/V)
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
HARMONIC DISTORTION vs LOAD RESISTANCE
G = +1
−
−
−
−
−
50
60
70
80
90
10k
VO = 2VPP
f = 1MHz
VCM = 1.5V
1k
100
10
Current Noise
Voltage Noise
2nd−Harmonic
3rd−Harmonic
−
100
1
100
1k
10
100
1k
10k
100k
1M
10M
100M
RL (Ω)
Frequency (Hz)
6
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SBOS235C − MARCH 2002− REVISED MAY 2004
TYPICAL CHARACTERISTICS (continued)
At T = +25°C, V = 5V, G = +1, R = 0Ω, R = 1kΩ, and connected to V /2, unless otherwise noted.
A
S
F
L
S
FREQUENCY RESPONSE FOR VARIOUS RL
RL = 10k
FREQUENCY RESPONSE FOR VARIOUS CL
G = +1
3
0
3
6
9
9
6
3
0
3
6
9
Ω
VO = 0.1VPP
RS = 0Ω
CL = 100pF
G = +1
RF = 0
Ω
−
−
−
VO = 0.1VPP
CL = 0pF
RL = 1k
Ω
−
−
−
CL = 47pF
RL = 100
Ω
Ω
RL = 50
CL = 5.6pF
−
−
12
−
−
12
15
15
100k
1M
10M
Frequency (Hz)
100M
1G
100k
1M
10M
Frequency (Hz)
100M
1G
RECOMMENDED RS vs CAPACITIVE LOAD
FREQUENCY RESPONSE vs CAPACITIVE LOAD
G = +1,
160
140
120
100
80
3
0
Ω
CL = 5.6pF, RS = 0
For 0.1dB
Flatness
VO = 0.1VPP
CL = 47pF, RS = 140
Ω
−
3
6
9
CL = 100pF, RS = 120
Ω
−
60
−
VIN
VIN
RS
RS
VO
VO
1kΩ
OPA357
OPA357
40
CL
1k
Ω
CL
−
−
12
20
0
15
100k
1G
1
1k
10
100
1M
10M
Frequency (Hz)
100M
Capacitive Load (pF)
COMMON−MODE REJECTION RATIO AND
POWER−SUPPLY REJECTION RATIO vs FREQUENCY
OPEN−LOOP GAIN AND PHASE
180
160
140
120
100
80
100
80
60
40
20
0
CMRR
Phase
Gain
PSRR+
−
PSRR
60
40
20
0
−
−
20
40
10k
100k
1M
10M
100M
1G
10
100
1k
10k 100k
1M
10M 100M 1G
Frequency (Hz)
Frequency (Hz)
7
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SBOS235C − MARCH 2002− REVISED MAY 2004
TYPICAL CHARACTERISTICS (continued)
At T = +25°C, V = 5V, G = +1, R = 0Ω, R = 1kΩ, and connected to V /2, unless otherwise noted.
A
S
F
L
S
COMPOSITE VIDEO
DIFFERENTIAL GAIN AND PHASE
INPUT BIAS CURRENT vs TEMPERATURE
10k
1k
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
dP
100
10
dG
1
−
55
−
55
−
55
−
−
−
−
15
1
2
3
4
35
5
25
45
65
85 105 125 135
_
Ω
Temperature ( C)
Number of 150 Loads
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
FOR VS = 3V
SUPPLY CURRENT vs TEMPERATURE
VS = 5V
3
7
6
5
4
3
2
1
0
2
1
0
VS = 2.5V
_
_
−
_
+125 C
+25 C
55 C
0
20
40
60
80
100
120
−
15
35
5
25
45
65
85 105 125 135
_
Output Current (mA)
Temperature ( C)
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
FOR VS = 5V
SHUTDOWN CURRENT vs TEMPERATURE
VS = 5.5V
5
4
3
2
1
0
4.5
4
3.5
3
VS = 5V
2.5
2
_
+25 C
−
_
_
55 C
+125 C
1.5
1
VS = 2.5V
VS = 3V
0.5
0
0
25
50
75
100
125
150
175
200
−
15
35
5
25
45
65
85 105 125 135
_
Output Current (mA)
Temperature ( C)
8
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TYPICAL CHARACTERISTICS (continued)
At T = +25°C, V = 5V, G = +1, R = 0Ω, R = 1kΩ, and connected to V /2, unless otherwise noted.
A
S
F
L
S
CLOSED−LOOP OUTPUT IMPEDANCE vs FREQUENCY
DISABLE FEEDTHROUGH vs FREQUENCY
VDISABLE = 0
100
10
0
20
40
60
80
Ω
RL = 10
−
−
−
−
1
Forward
Reverse
0.1
0.01
OPA357
−
−
100
ZO
120
100k
1M
10M
100M
1G
100k
1M
10M
Frequency (Hz)
100M
1G
Frequency (Hz)
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
VS = 5.5V
OUTPUT SETTLING TIME TO 0.1%
VO = 2VPP
6
5
4
3
2
1
0
0.5
0.4
0.3
0.2
0.1
0
Maximum Output
Voltage without
Slew−Rate
Induced Distortion
VS = 2.7V
−
−
−
−
−
0.1
0.2
0.3
0.4
0.5
0
10
20
30
40
50
60
70
80
90 100
1
10
Frequency (MHz)
100
Time (ns)
OPEN−LOOP GAIN vs TEMPERATURE
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
120
110
100
90
RL = 1k
Ω
80
70
−
−
−
15
55
35
5
25
45
65
85 105 125 135
−
−
−
−
−
−
−
−
2 1
8
7
6
5
4
3
0
1
2
3
4
5
6
7 8
_
Temperature ( C)
Offset Voltage (mV)
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TYPICAL CHARACTERISTICS (continued)
At T = +25°C, V = 5V, G = +1, R = 0Ω, R = 1kΩ, and connected to V /2, unless otherwise noted.
A
S
F
L
S
COMMON−MODE REJECTION RATIO AND
POWER−SUPPLY REJECTION RATIO vs TEMPERATURE
CHANNEL−TO−CHANNEL CROSSTALK
0
20
40
60
80
100
90
80
70
60
50
−
−
−
−
Common−Mode Rejection Ratio
Power−Supply Rejection Ratio
OPA2357
−
−
100
120
100k
1M
10M
Frequency (Hz)
100M
1G
−
−
−
15
55
35
5
25
45
65
85 105 125 135
_
Temperature ( C)
10
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The Enable input can be modeled as a CMOS input gate
with a 100kΩ pull-up resistor to V+. This pin should be
connected to a valid high or low voltage or driven, not left
open circuit.
APPLICATIONS INFORMATION
The OPA357 is a CMOS, rail-to-rail I/O, high-speed,
voltage-feedback operational amplifier designed for video,
high-speed, and other applications. It is available as a
single or dual op amp.
The enable time is 100ns and the disable time is only 30ns.
This allows the OPA357 to be operated as a gated
amplifier, or to have its output multiplexed onto a common
output bus. When disabled, the output assumes a
high-impedance state.
The amplifier features a 100MHz gain bandwidth, and
150V/µs slew rate, but it is unity-gain stable and can be
operated as a +1V/V voltage follower.
OPERATING VOLTAGE
RAIL-TO-RAIL INPUT
The specified input common-mode voltage range of the
OPA357 extends 100mV beyond the supply rails. This is
The OPA357 is specified over a power-supply range of
+2.7V to +5.5V ( 1.35V to 2.75V). However, the supply
voltage may range from +2.5V to +5.5V ( 1.25V to
2.75V). Supply voltages higher than 7.5V (absolute
maximum) can permanently damage the amplifier.
achieved with
a
complementary input stagean
N-channel input differential pair in parallel with a
P-channel differential pair, as shown in Figure 1. The
N-channel pair is active for input voltages close to the
positive rail, typically (V+) − 1.2V to 100mV above the
positive supply, while the P-channel pair is on for inputs
from 100mV below the negative supply to approximately
(V+) − 1.2V. There is a small transition region, typically
(V+) − 1.5V to (V+) − 0.9V, in which both pairs are on. This
600mV transition region can vary 500mV with process
variation. Thus, the transition region (both input stages on)
can range from (V+) − 2.0V to (V+) − 1.5V on the low end,
up to (V+) − 0.9V to (V+) − 0.4V on the high end.
Parameters that vary over supply voltage or temperature
are shown in the Typical Characteristics section of this
data sheet.
ENABLE FUNCTION
The OPA357’s Enable function is implemented using a
Schmitt trigger. The amplifier is enabled by applying a TTL
HIGH voltage level (referenced to V−) to the Enable pin.
Conversely, a TTL LOW voltage level (referenced to V−)
will disable the amplifier, reducing its supply current from
4.9mA to only 3.4µA per amplifier. Independent Enable
pins are available for each channel (dual version),
providing maximum design flexibility. For portable
battery-operated applications, this feature can be used to
greatly reduce the average current and thereby extend
battery life.
A double-folded cascode adds the signal from the two
input pairs and presents a differential signal to the class AB
output stage.
V+
Reference
Current
VIN+
VIN−
VBIAS1
Class AB
Control
VO
Circuitry
VBIAS2
V
−
(Ground)
Figure 1. Simplified Schematic
11
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RAIL-TO-RAIL OUTPUT
R2
A class AB output stage with common-source transistors
is used to achieve rail-to-rail output. For high-impedance
loads (> 200Ω), the output voltage swing is typically
100mV from the supply rails. With 10Ω loads, a useful
output swing can be achieved while maintaining high
open-loop gain. See the typical characteristic curve Output
Voltage Swing vs Output Current.
Ω
10k
C1
200pF
+5V
µ
1 F
R1
Ω
Ω
100k
Ω
Ω
R5 = 1
OUTPUT DRIVE
OPA2357
The OPA357’s output stage can supply a continuous
output current of 100mA and still provide approximately
2.7V of output swing on a 5V supply, as shown in Figure 2.
For maximum reliability, it is not recommended to run a
continuous DC current in excess of 100mA. Refer to the
typical characteristic curve Output Voltage Swing vs
Output Current. For supplying continuous output currents
greater than 100mA, the OPA357 may be operated in
parallel as shown in Figure 3.
R3
100k
+
−
RSHUNT
R6 = 1
2V In = 200mA
Out, as Shown
Ω
1
OPA2357
R4
10k
Ω
The OPA357 will provide peak currents up to 200mA,
which corresponds to the typical short-circuit current.
Therefore, an on-chip thermal shutdown circuit is provided
to protect the OPA357 from dangerously high junction
temperatures. At 160°C, the protection circuit will shut
down the amplifier. Normal operation will resume when the
junction temperature cools to below 140°C.
Laser Diode
Figure 3. Parallel Operation
VIDEO
The OPA357 output stage is capable of driving standard
back-terminated 75Ω video cables, as shown in Figure 4.
By back-terminating a transmission line, it does not exhibit
a capacitive load to its driver. A properly back-terminated
75Ω cable does not appear as capacitance; it presents
only a 150Ω resistive load to the OPA357 output.
R2
1kΩ
+
V1
5V
C1
50pF
−
1µF
R1
V+
10kΩ
+5V
OPA357
Video
75
Ω
R3
V−
In
Video
10k
Ω
OPA357
VIN
RSHUNT
75Ω
+2.5V
Output
+
R4
1kΩ
−
To enable,
connect to V+
1V In = 100mA
Out, as Shown
Laser Diode
or drive with logic.
604Ω
604Ω
+2.5V
Figure 2. Laser Diode Driver
Figure 4. Single-Supply Video Line Driver
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The OPA357 can be used as an amplifier for RGB graphic
signals, which have a voltage of zero at the video black
level, by offsetting and AC-coupling the signal. See
Figure 5.
Ω
604
+3V
+
µ
1 F
10nF
V+
Ω
604
Ω
75
1/2
OPA2357
Red
R1
R2
Red(1)
Ω
75
V+
R1
R2
Green(1)
Ω
75
1/2
OPA2357
Green
Ω
604
Ω
75
Ω
Ω
604
NOTE: (1) Source video signal offset
300mV above ground to accomodate
op amp swing−to−ground capability.
604
+3V
+
µ
1 F
10nF
V+
Ω
604
Ω
75
Blue
R1
R2
OPA357
Blue(1)
Ω
75
Figure 5. RGB Cable Driver
13
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inputs to source onto a single line. This simple Wired-OR
Video Multiplexer can be easily implemented using the
OPA357; see Figure 6.
WIDEBAND VIDEO MULTIPLEXING
One common application for video speed amplifiers which
include an enable pin is to wire multiple amplifier outputs
together, then select which one of several possible video
+2.5V
+
+
µ
1 F
10nF
10nF
A
Ω
49.9
Signal #1
OPA357
µ
1 F
−
2.5V
Ω
1k
Ω
49.9
VOUT
Ω
1k
Ω
49.9
+2.5V
+
+
µ
1 F
10nF
10nF
B
Ω
49.9
Signal #2
OPA357
µ
1 F
−
2.5V
Ω
1k
Ω
1k
HCO4
BON
Select
AON
Figure 6. Multiplexed Output
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resistance, to create a pole in the small-signal response
that degrades the phase margin. Refer to the typical
characteristic curve Frequency Response for Various CL
for details.
DRIVING ANALOG−TO−DIGITAL
CONVERTERS
The OPA357 series op amps offer 60ns of settling time to
0.01%, making them a good choice for driving high- and
medium-speed sampling A/D converters and reference
circuits. The OPA357 series provide an effective means of
buffering the A/D converter’s input capacitance and
resulting charge injection while providing signal gain.
The OPA357’s topology enhances its ability to drive
capacitive loads. In unity gain, these op amps perform well
with large capacitive loads. Refer to the typical
characteristic curves Recommended RS vs Capacitive
Load and Frequency Response vs Capacitive Load for
details.
See Figure 7 for the OPA357 driving an A/D converter.
With the OPA357 in an inverting configuration, a capacitor
across the feedback resistor can be used to filter
high-frequency noise in the signal; see Figure 7.
One method of improving capacitive load drive in the
unity-gain configuration is to insert a 10Ω to 20Ω resistor
in series with the output, as shown in Figure 8. This
significantly reduces ringing with large capacitive
loadssee the typical characteristic curve Frequency
Response vs Capacitive Load. However, if there is a
resistive load in parallel with the capacitive load, RS
creates a voltage divider. This introduces a DC error at the
output and slightly reduces output swing. This error may
be insignificant. For instance, with RL = 10kΩ and RS =
20Ω, there is only about a 0.2% error at the output.
CAPACITIVE LOAD AND STABILITY
The OPA357 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 determining stability. An op amp in unity-gain
configuration is most susceptible to the effects of
capacitive loading. The capacitive load reacts with the op
amp’s output resistance, along with any additional load
+5V
330pF
Ω
Ω
5k
5k
VIN
VREF
V+
ADS7818, ADS7861,
5kΩ
+In
or ADS7864
OPA357
12−Bit A/D Converter
+2.5V
−
µ
In
0.1 F
GND
−
VIN = 0V to 5V for 0V to 5V output.
NOTE: A/D Converter Input = 0V to VREF
Figure 7. The OPA357 in Inverting Configuration Driving an A/D Converter
V+
RS
VOUT
OPA357
VIN
RL
CL
To enable,
connect to V+
or drive with logic.
Figure 8. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive
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WIDEBAND TRANSIMPEDANCE AMPLIFIER
PCB LAYOUT
Wide bandwidth, low input bias current, and low input
voltage and current noise make the OPA357 an ideal
wideband photodiode transimpedance amplifier for
low-voltage single-supply applications. Low-voltage noise
is important because photodiode capacitance causes the
effective noise gain of the circuit to increase at high
frequency.
Good high-frequency printed circuit board (PCB) layout
techniques should be employed for the OPA357.
Generous use of ground planes, short and direct signal
traces, and a suitable bypass capacitor located at the V+
pin will assure clean, stable operation. Large areas of
copper also provides a means of dissipating heat that is
generated in normal operation.
The key elements to a transimpedance design, as shown
in Figure 9, are the expected diode capacitance (including
the parasitic input common-mode and differential-mode
input capacitance (2 + 2)pF for the OPA357), the desired
transimpedance gain (RF), and the Gain Bandwidth
Product (GBP) for the OPA357 (100MHz). With these 3
variables set, the feedback capacitor value (CF) may be set
to control the frequency response.
Sockets are definitely not recommended for use with any
high-speed amplifier.
A 10nF ceramic bypass capacitor is the minimum
recommended value; adding a 1µF or larger tantalum
capacitor in parallel can be beneficial when driving a
low-resistance load. Providing adequate bypass
capacitance is essential to achieving very low harmonic
and intermodulation distortion.
CF
<1pF
POWER DISSIPATION
(prevents gain peaking)
Besides the regular SOT23-6 and MSOP-10, the single
and dual versions of the OPA357 also come in an SO-8
PowerPAD. The SO-8 PowerPAD is a standard-size SO-8
package where the exposed leadframe on the bottom of
the package is soldered directly to the PCB to create an
extremely low thermal resistance. This will enhance the
OPA357’s power dissipation capability significantly and
eliminates the use of bulky heatsinks and slugs
traditionally used in thermal packages. This package can
be easily mounted using standard PCB assembly
techniques. NOTE: Since the SO-8 PowerPAD is
pin-compatible with standard SO-8 packages, the
OPA357 can directly replace operational amplifiers in
existing sockets. Soldering the PowerPAD to the PCB is
always recommended, even with applications that have
low power dissipation. This provides the necessary
thermal and mechanical connection between the
leadframe die pad and the PCB.
RF
10M
Ω
+V
λ
CD
VOUT
OPA357
To enable,
connect to V+
or drive with logic.
Figure 9. Transimpedance Amplifier
To achieve a maximally flat 2nd-order Butterworth
frequency response, the feedback pole should be set to:
For resistive loads, the maximum power dissipation occurs
at a DC output voltage of one-half the power-supply
voltage. Dissipation with AC signals is lower. Application
Bulletin AB-039 (SBOA022), Power Amplifier Stress and
Power Handling Limitations, explains how to calculate or
measure power dissipation with unusual signals and
loads, and can be found at www.ti.com.
GBP
4pRFCD
1
+
Ǹ
2pRFCF
(1)
Typical surface-mount resistors have
capacitance of around 0.2pF that must be deducted from
the calculated feedback capacitance value.
a
parasitic
Any tendency to activate the thermal protection circuit
indicates excessive power dissipation or an inadequate
heat sink. For reliable operation, junction temperature
should be limited to 150°C, maximum. To estimate the
margin of safety in a complete design, increase the
ambient temperature until the thermal protection is
triggered at 160°C. The thermal protection should trigger
more than 35°C above the maximum expected ambient
condition of your application.
Bandwidth is calculated by:
GBP
2pRFCD
f*3dB
+
Hz
Ǹ
(2)
For even higher transimpedance bandwidth, the
high-speed CMOS OPA355 (200MHz GBW) or the
OPA655 (400MHz GBW) may be used.
16
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PowerPAD THERMALLY ENHANCED
PACKAGE
PowerPAD ASSEMBLY PROCESS
1. The PowerPAD must be connected to the device’s most
negative supply voltage, which will be ground in
single-supply applications, and V− in split−supply
applications.
The OPA357 uses the SO-8 PowerPAD package, a
thermally enhanced, standard size IC package designed
to eliminate the use of bulky heatsinks and slugs
traditionally used in thermal packages. This package can
be easily mounted using standard PCB assembly
techniques.
2. Prepare the PCB with a top-side etch pattern, as shown
in Figure 11. The exact land design may vary based on the
specific assembly process requirements. There should be
etch for the leads as well as etch for the thermal land.
The PowerPAD package is designed so that the leadframe
die pad (or thermal pad) is exposed on the bottom of the
IC, as shown in Figure 10. This provides an extremely low
thermal resistance (qJC) path between the die and the
exterior of the package. The thermal pad on the bottom of
the IC is then soldered directly to the PCB, using the PCB
as a heatsink. In addition, plated-through holes (vias)
provide a low thermal resistance heat flow path to the back
side of the PCB.
Thermal Land
(Copper)
Minimum Size
OPTIONAL:
Additional 4 vias outside
4.8mm x 3.8mm
of thermal pad area but
(189 mils x 150 mils)
under the package.
REQUIRED:
Thermal pad area 2.286mm x 2.286mm
(90 mils x 90 mils) with 5 vias
(via diameter = 13 mils)
Leadframe (Copper Alloy)
Figure 11. 8-Pin PowerPAD PCB Etch and Via
Pattern
IC (Silicon)
Die Attach (Epoxy)
3. Place the recommended number of plated-through
holes (or thermal vias) in the area of the thermal pad.
These holes should be 13 mils in diameter. They are kept
small so that solder wicking through the holes is not a
problem during reflow. The minimum recommended
number of holes for the SO-8 PowerPAD package is 5, as
shown in Figure 11.
Leadframe Die Pad
Exposed at Base of the Package
(Copper Alloy)
Mold Compound (Plastic)
4. It is recommended, but not required, to place a small
number of additional holes under the package and outside
the thermal pad area. These holes provide additional heat
paths between the copper thermal land and the ground
plane. They may be larger because they are not in the area
to be soldered, so wicking is not a problem. This is
illustrated in Figure 11.
Figure 10. Section View of a PowerPAD Package
17
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5. Connect all holes, including those within the thermal pad
area and outside the pad area, to the internal ground plane
or other internal copper plane for single-supply
applications, and to V− for split-supply applications.
7. The top-side solder mask should leave the pad
connections and the thermal pad area exposed. The
thermal pad area should leave the 13 mil holes exposed.
The larger holes outside the thermal pad area may be
covered with solder mask.
6. When laying out these holes, do not use the typical web
or spoke via connection methodology, as shown in
Figure 12. Web connections have a high thermal
resistance connection that is useful for slowing the heat
transfer during soldering operations. This makes soldering
the vias that have ground plane connections easier.
However, in this application, low thermal resistance is
desired for the most efficient heat transfer. Therefore, the
holes under the PowerPAD package should make their
connection to the internal ground plane with a complete
connection around the entire circumference of the
plated-through hole.
8. Apply solder paste to the exposed thermal pad area and
all of the package terminals.
9. With these preparatory steps in place, the PowerPAD IC
is simply placed in position and run through the solder
reflow operation as any standard surface-mount
component. This results in a part that is properly installed.
For detailed information on the PowerPAD package
including thermal modeling considerations and repair
procedures, please see Technical Brief SLMA002,
PowerPAD Thermally Enhanced Package, located at
www.ti.com.
Web or Spoke Via
Solid Via
NOT RECOMMENDED
(due to poor heat conduction)
RECOMMENDED
Figure 12. Internal ESD Protection
18
PACKAGE OPTION ADDENDUM
www.ti.com
10-May-2004
PACKAGING INFORMATION
ORDERABLE DEVICE
STATUS(1)
PACKAGE TYPE
PACKAGE DRAWING
PINS
PACKAGE QTY
OPA2357AIDGSR
OPA2357AIDGST
OPA357AIDBVR
OPA357AIDBVT
OPA357AIDDA
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
VSSOP
VSSOP
SOP
DGS
DGS
DBV
DBV
DDA
DDA
10
10
6
2500
250
3000
250
SOP
6
HSOP
HSOP
8
100
OPA357AIDDAR
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.
IMPORTANT NOTICE
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enhancements, improvements, and other changes to its products and services at any time and to discontinue
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in
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