OPA358AIDCKR [TI]
3V Single-Supply 80MHz High-Speed Op Amp;![OPA358AIDCKR](http://pdffile.icpdf.com/pdf2/p00316/img/icpdf/OPA358AIDCKT_1897446_icpdf.jpg)
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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 150Ω load 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
D
HIGH SLEW RATE: 55V/µs
EXCELLENT VIDEO PERFORMANCE
− 0.5dB GAIN FLATNESS: 25MHz
− DIFFERENTIAL GAIN: 0.3%
− DIFFERENTIAL PHASE: 0.7°
D
INPUT RANGE INCLUDES GROUND
RAIL-TO-RAIL OUTPUT
D
D
D
D
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.
D
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
D
D
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
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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 = 150Ω connected 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
Ω || pF
Ω || 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
Ω
S
OL
V
S
V
S
= +3.3V, V = 0V, R = 150Ω to 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.
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SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005
TYPICAL CHARACTERISTICS
All specifications at T = +25°C, R = 150Ω connected 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 = 150Ω connected 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 = 150Ω connected 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)
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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 150Ω load, 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
Ω
75
Ω
75
Ω
1k
Ω
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
Ω
500
Ω
500
a. Test circuit for Figure 3 through Figure 5.
Figure 3. Multiburst (CCIR 18) Test Pattern (PAL)
1
2
Ω
500
Ω
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)
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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
Ω
75
Ω
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 150Ω load connected to ground.
µ
47 F
Ω
75
Ω
1.3k
µ
22 F
Ω
75
Ω
499
Ω
825
SAG CORRECTION
Ω
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
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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
Ω
75
(1)
OPA358
Ω
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.
Ω
NOTE: (1) Optional 200 for use with TI’s digital media processors,
Ω
and 500 for OMAP2420 and OMAP2430 processors.
Figure 8. DC-Coupled Input/DC-Coupled Output
+3.3
+
µ
1 F
10nF
Ω
75
Signal #1
OPA358
Ω
1k
Ω
75
VOUT
Ω
1k
Ω
75
+3.3V
+
µ
1 F
10nF
Ω
75
Signal #2
OPA358
Ω
1k
Ω
1k
HCO4
BON
Select
AON
Figure 9. Multiplexed Output
10
ꢂ
ꢀ
ꢉ
ꢠ
ꢡ
ꢢ
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 10Ω to 20Ω resistor
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 = 10kΩ and RS = 20Ω, there is only about a 0.2%
error at the output.
(prevents gain peaking)
RF
Ω
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
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