OPA358AIDCKT [TI]

3V Single-Supply 80MHz High-Speed Op Amp;
OPA358AIDCKT
型号: OPA358AIDCKT
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

3V Single-Supply 80MHz High-Speed Op Amp

放大器 光电二极管
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OPA358  
SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005  
3V Single-Supply  
80MHz High-Speed Op Amp in SC70  
FD EATURES  
DESCRIPTION  
HIGH BANDWIDTH: 80MHz  
The high-speed OPA358 amplifier is optimized for 3V  
single-supply operation. The output typically swings within  
5mV of GND with a 150load connected to GND. The  
input common-mode range includes GND and swings to  
within 1V of the positive power supply. The OPA358 offers  
excellent video performance: 0.5dB gain flatness is  
25MHz, differential gain is 0.3%, and differential phase is  
0.7°.  
D
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HIGH SLEW RATE: 55V/µs  
EXCELLENT VIDEO PERFORMANCE  
− 0.5dB GAIN FLATNESS: 25MHz  
− DIFFERENTIAL GAIN: 0.3%  
− DIFFERENTIAL PHASE: 0.7°  
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INPUT RANGE INCLUDES GROUND  
RAIL-TO-RAIL OUTPUT  
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The OPA358 is optimized for supply voltages from +2.7V  
to +3.3V, with an operating range of +2.5V to +3.6V.  
Quiescent current is only 5.2mA per channel.  
SHUTDOWN CURRENT: < 5µA  
LOW QUIESCENT CURRENT: 5.2mA  
SINGLE-SUPPLY OPERATING RANGE:  
+2.7V to +3.3V  
In shutdown mode, the quiescent current is reduced to  
< 5µA, dramatically reducing power consumption. This is  
especially important in battery-operated equipment such  
as digital still cameras (DSCs) or mobile phones with  
integrated cameras.  
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MicroSIZE PACKAGE: SC70-6  
AD PPLICATIONS  
The OPA358 is available in SC70-6, the smallest package  
currently available for video applications.  
DIGITAL STILL CAMERAS  
D
D
D
D
D
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CAMERA PHONES  
DIGITAL MEDIA PLAYERS  
DIGITAL VIDEO CAMERAS  
SET-TOP-BOX VIDEO FILTERS  
OPTICAL POWER MONITORING  
TRANSIMPEDANCE AMPLIFIERS  
AUTOMATIC TEST EQUIPMENT  
OPA358 RELATED PRODUCTS  
FEATURES  
PRODUCT  
OPA360  
OPA357  
OPA355  
OPA350  
OPA692  
THS412x  
G = 2, Internal Filter, Sag Correction, Shutdown, Video Amp  
100MHz GBW, RR I/O, Shutdown, CMOS Amp  
200MHz GBW, RR Out, Shutdown, CMOS Amp  
38MHz GBW, RR I/O, CMOS Amp  
> 200MHz, Shutdown, Video Buffer Amp, G = 2  
100MHz BW, Differential Input/Output, 3.3V Supply  
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.  
ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆꢇ ꢂꢈ ꢃ ꢉꢆꢉ ꢊꢋ ꢌꢍ ꢎ ꢏꢐ ꢑꢊꢍꢋ ꢊꢒ ꢓꢔ ꢎ ꢎ ꢕꢋꢑ ꢐꢒ ꢍꢌ ꢖꢔꢗ ꢘꢊꢓ ꢐꢑꢊ ꢍꢋ ꢙꢐ ꢑꢕꢚ ꢀꢎ ꢍꢙꢔ ꢓꢑꢒ  
ꢓ ꢍꢋ ꢌꢍꢎ ꢏ ꢑꢍ ꢒ ꢖꢕ ꢓ ꢊ ꢌꢊ ꢓ ꢐ ꢑꢊ ꢍꢋꢒ ꢖ ꢕꢎ ꢑꢛꢕ ꢑꢕ ꢎ ꢏꢒ ꢍꢌ ꢆꢕꢜ ꢐꢒ ꢇꢋꢒ ꢑꢎ ꢔꢏ ꢕꢋꢑ ꢒ ꢒꢑ ꢐꢋꢙ ꢐꢎ ꢙ ꢝ ꢐꢎ ꢎ ꢐ ꢋꢑꢞꢚ  
ꢀ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 2004−2005, Texas Instruments Incorporated  
www.ti.com  
ꢂꢀꢉꢠ ꢡꢢ  
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SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005  
(1)  
PACKAGE/ORDERING INFORMATION  
SPECIFIED  
TEMPERATURE  
RANGE  
PACKAGE  
DESIGNATOR  
PACKAGE  
MARKING  
ORDERING  
NUMBER  
TRANSPORT  
MEDIA, QUANTITY  
PRODUCT  
PACKAGE  
OPA358AIDCKT  
OPA358AIDCKR  
Tape and Reel, 250  
Tape and Reel, 3000  
OPA358  
SC70-6  
DCK  
−40°C to +85°C  
AUS  
(1)  
For the most current package and ordering information, see the Package Option Addendum located at the end of this document, or see the  
TI website at www.ti.com.  
This integrated circuit can be damaged by ESD. Texas  
Instruments recommends that all integrated circuits be  
handledwith appropriate precautions. Failure to observe  
(1)  
ABSOLUTE MAXIMUM RATINGS  
Supply Voltage, V+ to V− . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.6V  
(2)  
proper handling and installation procedures can cause damage.  
Signal Input Terminals, Voltage  
Signal Input Terminals, Current  
. . . . (V−) −0.5V to (V+) + 0.5V  
. . . . . . . . . . . . . . . . . . . . 10mA  
(2)  
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.  
(3)  
Output Short-Circuit  
. . . . . . . . . . . . . . . . . . . . . . . . . Continuous  
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . −40°C to +85°C  
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C  
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +160°C  
Lead Temperature (soldering, 10s) . . . . . . . . . . . . . . . . . . . . +300°C  
ESD Rating:  
Human Body Model (HBM) . . . . . . . . . . . . . . . . . . . . . . . 4000V  
Charged Device Model (CDM) . . . . . . . . . . . . . . . . . . . . 1500V  
Machine Model (MM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400V  
(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 implied.  
(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.  
PIN CONFIGURATIONS  
OPA358  
+
In  
1
2
3
6
5
4
V+  
GND  
Enable  
Out  
In  
SC70−6(1)  
(1) Pin 1 is determined by orienting the package marking as indicated in the diagram.  
2
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SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005  
ELECTRICAL CHARACTERISTICS: V = +2.7V to +3.3V Single-Supply  
S
Boldface limits apply over the specified temperature range, T = −40°C to +85°C.  
A
All specifications at T = +25°C, R = 150connected to V /2, unless otherwise noted.  
A
L
S
OPA358  
TYP  
PARAMETER  
OFFSET VOLTAGE  
Input Offset Voltage  
Over Temperature  
Drift  
CONDITIONS  
= +3.3V  
Specified Temperature Range  
Specified Temperature Range  
MIN  
MAX  
UNITS  
V
V
S
2
6
15  
mV  
mV  
µV/°C  
µV/V  
OS  
dV /dT  
OS  
5
80  
vs. Power Supply  
PSRR  
V
= +2.7V to +3.3V  
350  
S
INPUT BIAS CURRENT  
Input Bias Current  
Input Offset Current  
I
0.3  
1
50  
50  
pA  
pA  
B
I
OS  
NOISE  
Input Voltage Noise Density  
e
f = 1MHz  
6.4  
80  
nV/Hz  
n
INPUT VOLTAGE RANGE  
Common-Mode Voltage Range  
Common-Mode Rejection Ratio  
V
(V−) − 0.1  
(V+) − 1.0  
V
dB  
dB  
CM  
CMRR  
V
S
= +3.3V, −0.1V < V  
Specified Temperature Range  
< 2.3V  
60  
60  
CM  
INPUT IMPEDANCE  
Differential  
Common-Mode  
13  
10 || 1.5  
|| pF  
|| pF  
13  
10 || 1.5  
OPEN-LOOP GAIN  
Open-Loop Voltage Gain  
Over Temperature  
A
OL  
V
S
= +3.3V, 0.1V < V < 3.1V  
84  
92  
dB  
O
See Typical Characteristics  
FREQUENCY RESPONSE  
Gain-Bandwidth Product  
Bandwidth for 0.1dB Gain Flatness  
Bandwidth for 0.5dB Gain Flatness  
Slew Rate  
Settling Time to 0.1%  
Differential Gain Error  
Differential Phase Error  
GBW  
0.1dB  
0.5dB  
SR  
G = +10, R = 1kΩ  
80  
12  
25  
55  
35  
0.3  
0.7  
MHz  
MHz  
MHz  
V/µs  
ns  
%
°
L
f
f
G = +2, V = 100mV , R = 560Ω  
O
PP  
F
G = +2, V = 100mV , R = 560Ω  
O
PP  
F
V
S
= +3.3V, G = +2, 2.5V Output Step  
G = 1, R = 150Ω  
L
PAL, R = 150Ω  
L
PAL, R = 150Ω  
L
OUTPUT  
Voltage Output Swing from Rail  
Over Temperature  
V
= +3.3V, A  
> 84dB  
= +3.3V  
(V−) + 100  
(V−) + 100  
(V+) − 200  
(V+) − 300  
mV  
mV  
mV  
mA  
S
OL  
V
S
V
S
= +3.3V, V = 0V, R = 150to GND  
5
50  
20  
IN  
L
(1)  
Output Current  
Open-Loop Output Impedance  
I
O
V
S
= +3.3V, 0.5V from Supplies  
f = 1MHz, I = 0  
O
POWER SUPPLY  
Specified Voltage Range  
Minimum Operating Voltage Range  
Quiescent Current  
V
2.7  
3.3  
V
V
mA  
mA  
S
2.5 to 3.6  
5.2  
I
Q
V
= +3.3V, Enabled, I = 0  
7.5  
8.5  
S
O
Specified Temperature Range  
ENABLE/SHUTDOWN FUNCTION  
Disabled (logic−LOW Threshold)  
Enabled (logic−HIGH Threshold)  
Enable Time  
Disable Time  
Shutdown Current  
0.8  
V
V
µs  
ns  
µA  
1.6  
1.5  
50  
2.5  
V
S
= +3.3, Disabled  
5
TEMPERATURE RANGE  
Specified Range  
Operating Range  
Storage Range  
−40  
−40  
−65  
+85  
+85  
+150  
°C  
°C  
°C  
Thermal Resistance  
SC70  
q
JA  
250  
°C/W  
(1)  
See typical characteristics chart, Output Voltage Swing vs Output Current.  
3
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SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005  
TYPICAL CHARACTERISTICS  
All specifications at T = +25°C, R = 150connected to V /2, unless otherwise noted.  
A
L
S
POWER−SUPPLY AND COMMON−MODE  
REJECTION RATIO vs FREQUENCY  
OPEN−LOOP GAIN AND PHASE vs FREQUENCY  
200  
180  
160  
140  
120  
100  
80  
200  
180  
160  
140  
120  
100  
80  
100  
80  
60  
40  
20  
0
+PSRR  
Phase  
Gain  
CMRR  
60  
60  
PSRR  
40  
40  
20  
20  
0
0
20  
20  
1G  
100  
1k  
10k  
100k  
1M  
10M 100M  
1k  
10k  
100k  
1M  
10M  
100M  
Frequency (MHz)  
Frequency (Hz)  
INPUT VOLTAGE NOISE SPECTRAL DENSITY  
GAIN FLATNESS vs FREQUENCY  
1.0  
0.5  
0
1000  
100  
10  
G = 2  
0.5  
1.0  
1
1
10  
100  
10  
100  
1k  
10k  
100k  
1M  
10M  
Frequency (MHz)  
Frequency (Hz)  
OFFSET VOLTAGE PRODUCTION DISTRIBUTION  
DIFFERENTIAL GAIN  
INP = C  
A
SYNC = INT  
MTIME = 1  
0
LINE = 330  
+1  
1
DG1  
0 . 1 9 %1  
0 . 2 8 % .  
0 . 3 0 % .  
0 . 3 0 % .  
0 . 2 8 %5  
DG2  
DG3  
DG4  
DG5  
STEPS  
ZOOM  
2
SAVE  
RESULTS  
4
5
0
1
DIFFERENTIAL PHASE  
INP = C  
A
SYNC = INT  
MTIME = 1  
0
LINE = 330  
+1  
1
DP1  
DP2  
DP3  
DP4  
DP5  
0 . 1 3 d g 1  
0 . 1 6 d g .  
0 . 4 7 d g .  
0 . 6 6 d g .  
0 . 6 9 d g 5  
STEPS  
ZOOM  
1
SAVE  
RESULTS  
4
5
0
2
Offset Voltage (mV)  
4
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SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005  
TYPICAL CHARACTERISTICS (continued)  
All specifications at T = +25°C, R = 150connected to V /2, unless otherwise noted.  
A
L
S
QUIESCENT CURRENT vs TEMPERATURE  
SHUTDOWN CURRENT vs TEMPERATURE  
8
7
6
5
4
3
2
1
0
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
25  
50  
0
25  
50  
75  
100  
25  
50  
0
25  
50  
75  
100  
125  
_
Temperature ( C)  
_
Temperature ( C)  
OPEN−LOOP GAIN, COMMON−MODE REJECTION, AND  
POWER−SUPPLY REJECTION RATIO vs TEMPERATURE  
INPUT BIAS CURRENT vs TEMPERATURE  
10  
1
110  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
AOL  
PSRR  
CMRR  
0.1  
0.01  
0.001  
25  
50  
0
25  
50  
75  
100  
25  
50  
0
25  
50  
75  
100  
_
Temperature ( C)  
_
Temperature ( C)  
OUTPUT VOLTAGE vs OUTPUT CURRENT  
LARGE−SIGNAL TRANSIENT  
(V+)  
55_C  
G = 2  
(V+) 0.5  
_
85 C  
(V+) 1.0  
_
25 C  
(V+) 1.5  
(V) + 1.5  
55_C  
(V ) + 1.0  
_
25 C  
85_C  
(V ) + 0.5  
(V)  
0
20  
40  
60  
80  
100  
Time (25ns/div)  
Output Current (mA)  
5
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TYPICAL CHARACTERISTICS (continued)  
All specifications at T = +25°C, R = 150connected to V /2, unless otherwise noted.  
A
L
S
ENABLE FUNCTION  
SMALL−SIGNAL TRANSIENT  
G = 1  
Enabled  
VOUT  
Disabled  
Time (500ns/div)  
Time (25ns/div)  
6
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SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005  
closer to the supply rails while maintaining high open-loop  
gain. If the load is connected to ground, the OPA358 output  
typically swings to within 5mV of ground. See the typical  
characteristic curve, Output Voltage Swing vs Output  
Current.  
APPLICATIONS INFORMATION  
OPERATING VOLTAGE  
The OPA358 is fully specified from +2.7V to +3.3V over a  
temperature range of −40°C to +85°C. Parameters that  
vary significantly with operating voltages or temperature  
are shown in the Typical Characteristics.  
ENABLE/SHUTDOWN  
Power-supply pins should be bypassed with a 100nF  
ceramic capacitor.  
The OPA358 has a shutdown feature that disables the  
output and reduces the quiescent current to less than 5µA.  
This feature is especially useful for portable video  
applications such as digital still cameras (DSCs) and  
camera phones, where the equipment is infrequently  
connected to a TV or other video device.  
INPUT VOLTAGE  
The input common-mode range of the OPA358 extends  
from (V−) − 0.1V to (V+) − 1.0V.  
The Enable logic input voltage is referenced to the  
OPA358 GND pin. A logic level HIGH applied to the enable  
pin enables the op amp. A valid logic HIGH is defined as  
1.6V above GND. A valid logic LOW is defined as 0.8V  
above GND. If the Enable pin is not connected, internal  
pull-up circuitry will enable the amplifier. Enable pin  
voltage levels are tested for a valid logic HIGH threshold  
of 1.6V minimum and a valid logic LOW threshold of 0.8V  
maximum.  
INPUT OVER-VOLTAGE PROTECTION  
All OPA358 pins are static-protected with internal ESD  
protection diodes connected to the supplies. These diodes  
will provide input overdrive protection if the current is  
externally limited to 10mA.  
RAIL-TO-RAIL OUTPUT  
A class AB output stage with common-source transistors  
is used to achieve rail-to-rail output. For a 150load, the  
output voltage swing is 100mV from the negative rail and  
200mV from the positive rail when the load is connected  
to VS/2. For lighter loads, the output swings significantly  
The enable time is 1.5µs and the disable time is only 50ns.  
This allows the output of the OPA358 to be multiplexed  
onto a common output bus. When disabled, the output  
assumes a high-impedance state.  
+3V  
100nF  
VOUT  
Television  
VIN  
75  
75  
1k  
1k  
Figure 1. Typical Circuit Using the OPA358 in a Gain = 2 Configuration  
7
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amplitudes. Figure 3 shows the multiburst test pattern;  
Figure 4 shows the multipulse. The top waveforms in  
these figures show the full test pattern. The middle and  
bottom waveform are a more detailed view of the critical  
portion of the full waveform. The middle waveform  
represents the input signal from the video generator; the  
bottom waveform is the OPA358 output to the line.  
VIDEO PERFORMANCE  
Industry standard video test patterns include:  
D
D
Multiburst—packets of different test frequencies to  
check for basic frequency response.  
Multipulse—pulses  
modulated  
at  
different  
frequencies to test for comprehensive measurement  
of amplitude and group delay errors across the video  
baseband.  
D
Chrominance-to-luminence (CCIR17) — tests ampli-  
tude, phase and some distortion  
Figure 2 shows the test circuits for Figure 3 through  
Figure 13 and Figure 16. (NOTE: 1 and 2 indicate  
measurement points corresponding to the waveforms  
labeled 1 and 2 in the figures.)  
1
2
500  
500  
a. Test circuit for Figure 3 through Figure 5.  
Figure 3. Multiburst (CCIR 18) Test Pattern (PAL)  
1
2
500  
500  
b. Test circuit for Figure 6.  
NOTE: 1 and 2 indicate measurement points  
corresponding to the waveforms labeled 1 and  
2 in the figures.  
Figure 2. Test Circuits Used for Figure 3 through  
Figure 6  
FREQUENCY RESPONSE OF THE OPA358  
Frequency response measurements evaluate the ability of  
a video system to uniformly transfer signal components of  
different frequencies without affecting their respective  
Figure 4. Multipulse Test Pattern (PAL)  
8
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Chrominance-to-luminence gain inequality (or relative  
chrominance level) is a change in the gain ratio of the  
chrominance and luminence components of a video  
signal, which are at different frequencies. A common test  
pattern is the pulse in test pattern CCIR 17, shown in  
Figure 5. As in Figure 3 and Figure 4, the top waveform  
shows the full test pattern. The middle and bottom  
waveform are a more detailed view of the critical portion of  
the full waveform, with the middle waveform representing  
the input signal from the video generator and the bottom  
waveform being the OPA358 output to the line.  
100Hz range produces field tilt which can interfere with  
proper recovery of synchronization signals in the television  
receiver.  
600mV  
0V  
Figure 6. OPA358 Output Swing with Input Sync  
Level at 0V  
The OPA358 with sag correction (Figure 7b) creates an  
amplitude response peak in the 20Hz region. This small  
amount of peaking (a few tenths of a dB) provides  
compensation of the phase response in the critical 50Hz  
to 100Hz range, greatly reducing field tilt. Note that two  
significantly smaller and lower-cost capacitors are  
required.  
Figure 5. CCIR 17 Test Pattern (PAL)  
Gain errors most commonly appear as attenuation or  
peaking of the chrominance information. This shows up in  
the picture as incorrect color saturation. Delay distortion  
will cause color smearing or bleeding, particularly at the  
edges of objects in the picture. It may also cause poor  
reproduction of sharp luminence transitions.  
µ
220 F  
75  
75  
G = 2  
Figure 3 through Figure 5 show that the OPA358 causes  
no visible distortion or change in gain throughout the entire  
video frequency range.  
a) Traditional Video Circuit  
OUTPUT SWING TO GND (SYNC PULSE)  
Figure 6 shows the output swing capability of the OPA358  
by driving the input with a sync level of 0V. The output of  
the OPA358 swings very close to 0V, typically to within less  
than 5mV with an 150load connected to ground.  
µ
47 F  
75  
1.3k  
µ
22 F  
75  
499  
825  
SAG CORRECTION  
1k  
DC Gain = 2.8  
AC Gain = 2  
Sag correction provides excellent video performance with  
two small output coupling capacitors. It eliminates the  
traditional, large 220µF output capacitor. The traditional  
220µF circuit (Figure 7a) creates a single low frequency  
pole (−3dB frequency) at 5Hz. If this capacitor is made  
much smaller, excessive phase shift in the critical 50Hz to  
b) OPA358 with Sag Correction  
Figure 7. Traditional Video Circuit vs OPA358  
with Sag Correction  
9
ꢂꢀꢉꢠ ꢡꢢ  
www.ti.com  
SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005  
The output voltage swing for the circuit with sag correction  
(see Figure 7b) is a function of the coupling capacitor  
value. The value of the sag correction capacitor has only  
a minor influence. The smaller the coupling capacitor, the  
greater the output swing. Therefore, to accommodate the  
large signal swing with very small coupling capacitors  
(22µF and 33µF), a higher supply voltage might be  
needed.  
WIDEBAND VIDEO MULTIPLEXING  
One common application for video amplifiers which  
include an enable pin is to wire multiple amplifier outputs  
together, then select which one of several possible video  
inputs to source onto a single line. This simple Wired-OR  
Video Multiplexer can be easily implemented using the  
OPA358, as shown in Figure 9.  
DC-COUPLED OUTPUT  
V+ = 2.7V to 3.3V  
Enable  
Due to the excellent swing to ground, the OPA358 can also  
be DC- coupled to a video load. As shown in Figure 8, this  
eliminates the need for AC-coupling capacitors at the  
output. This is especially important in portable video  
applications where board space is restricted.  
ROUT  
Video  
DAC  
75  
(1)  
OPA358  
75  
The DC-coupled output configuration also shows the best  
video performance. There is no line or field tilt—allowing  
use of the lowest power supply. In this mode, the OPA358  
will safely operate down to 2.5V with no clipping of the  
signal.  
R1  
R1  
R2  
G = 1 +  
Television  
or VCR  
R2  
GND  
The disadvantage with DC-coupled output is that it uses  
somewhat higher supply current.  
NOTE: (1) Optional 200 for use with TI’s digital media processors,  
and 500 for OMAP2420 and OMAP2430 processors.  
Figure 8. DC-Coupled Input/DC-Coupled Output  
+3.3  
+
µ
1 F  
10nF  
75  
Signal #1  
OPA358  
1k  
75  
VOUT  
1k  
75  
+3.3V  
+
µ
1 F  
10nF  
75  
Signal #2  
OPA358  
1k  
1k  
HCO4  
BON  
Select  
AON  
Figure 9. Multiplexed Output  
10  
www.ti.com  
SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005  
The key elements to a transimpedance design, as shown  
in Figure 11, are the expected diode capacitance  
(including the parasitic input common-mode and  
differential-mode input capacitance (1.5 + 1.5)pF for the  
OPA358), the desired transimpedance gain (RF), and the  
Gain Bandwidth Product (GBW) for the OPA358 (80MHz).  
With these 3 variables set, the feedback capacitor value  
(CF) may be set to control the frequency response.  
CAPACITIVE LOAD AND STABILITY  
The OPA358 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 output resistance,  
along with any additional load resistance, to create a pole  
in the small-signal response that degrades the phase  
margin.  
CF  
<1pF  
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 10. This  
significantly reduces ringing with large capacitive loads.  
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 = 10kand RS = 20, there is only about a 0.2%  
error at the output.  
(prevents gain peaking)  
RF  
10M  
+V  
λ
CD  
VOUT  
OPA358  
To enable,  
connect to V+  
or drive with logic.  
V+  
RS  
VOUT  
Figure 11. Transimpedance Amplifier  
OPA358  
VIN  
RL  
CL  
To achieve a maximally flat 2nd-order Butterworth  
frequency response, the feedback pole should be set to:  
To enable,  
connect to V+  
or drive with logic.  
GBW  
4pRFCD  
1
+
Ǹ
2pRFCF  
(1)  
Figure 10. Series Resistor in Unity-Gain  
Typical surface-mount resistors have  
capacitance of around 0.2pF that must be deducted from  
the calculated feedback capacitance value.  
a
parasitic  
Configuration Improves Capacitive Load Drive  
WIDEBAND TRANSIMPEDANCE AMPLIFIER  
Bandwidth is calculated by:  
Wide bandwidth, low input bias current, and low input  
voltage and current noise make the OPA358 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.  
GBW  
2pRFCD  
f*3dB  
+
Hz  
Ǹ
(2)  
For even higher transimpedance bandwidth, the CMOS  
OPA380 (90MHz GBW), OPA355 (200MHz GBW), or the  
OPA655 (400MHz GBW) may be used.  
11  
PACKAGE OPTION ADDENDUM  
www.ti.com  
10-Jun-2014  
PACKAGING INFORMATION  
Orderable Device  
OPA358AIDCKR  
OPA358AIDCKT  
OPA358AIDCKTG4  
Status Package Type Package Pins Package  
Eco Plan  
Lead/Ball Finish  
MSL Peak Temp  
Op Temp (°C)  
-40 to 85  
Device Marking  
Samples  
Drawing  
Qty  
(1)  
(2)  
(6)  
(3)  
(4/5)  
ACTIVE  
SC70  
SC70  
SC70  
DCK  
6
6
6
3000  
Green (RoHS  
& no Sb/Br)  
CU NIPDAU  
CU NIPDAU  
CU NIPDAU  
Level-1-260C-UNLIM  
Level-1-260C-UNLIM  
Level-1-260C-UNLIM  
AUS  
AUS  
AUS  
ACTIVE  
ACTIVE  
DCK  
DCK  
250  
250  
Green (RoHS  
& no Sb/Br)  
-40 to 85  
Green (RoHS  
& no Sb/Br)  
-40 to 85  
(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.  
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.  
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation  
of the previous line and the two combined represent the entire Device Marking for that device.  
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish  
value exceeds the maximum column width.  
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  
Addendum-Page 1  
PACKAGE OPTION ADDENDUM  
www.ti.com  
10-Jun-2014  
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  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
25-Feb-2013  
TAPE AND REEL INFORMATION  
*All dimensions are nominal  
Device  
Package Package Pins  
Type Drawing  
SPQ  
Reel  
Reel  
A0  
B0  
K0  
P1  
W
Pin1  
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant  
(mm) W1 (mm)  
OPA358AIDCKR  
OPA358AIDCKT  
OPA358AIDCKT  
SC70  
SC70  
SC70  
DCK  
DCK  
DCK  
6
6
6
3000  
250  
179.0  
179.0  
178.0  
8.4  
8.4  
9.0  
2.2  
2.2  
2.4  
2.5  
2.5  
2.5  
1.2  
1.2  
1.2  
4.0  
4.0  
4.0  
8.0  
8.0  
8.0  
Q3  
Q3  
Q3  
250  
Pack Materials-Page 1  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
25-Feb-2013  
*All dimensions are nominal  
Device  
Package Type Package Drawing Pins  
SPQ  
Length (mm) Width (mm) Height (mm)  
OPA358AIDCKR  
OPA358AIDCKT  
OPA358AIDCKT  
SC70  
SC70  
SC70  
DCK  
DCK  
DCK  
6
6
6
3000  
250  
203.0  
203.0  
180.0  
203.0  
203.0  
180.0  
35.0  
35.0  
18.0  
250  
Pack Materials-Page 2  
IMPORTANT NOTICE  
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TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms  
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Applications  
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