OPA358

OPA358 SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 3V Single-Supply 80MHz High-Speed Op Amp in SC70 FEATURES D HIGH BANDWIDTH: 80MHz D HIGH SLEW RATE: 55V/µs D EXCELLENT VIDEO PERFORMANCE − 0.5dB GAIN FLATNESS: 25MHz − DIFFERENTIAL GAIN: 0.3% − DIFFERENTIAL PHASE: 0.7° DESCRIPTION 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°. 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. 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. The OPA358 is available in SC70-6, the smallest package currently available for video applications. D D D D D D INPUT RANGE INCLUDES GROUND RAIL-TO-RAIL OUTPUT SHUTDOWN CURRENT: < 5µA LOW QUIESCENT CURRENT: 5.2mA SINGLE-SUPPLY OPERATING RANGE: +2.7V to +3.3V MicroSIZE PACKAGE: SC70-6 APPLICATIONS D D D D D D D D DIGITAL STILL CAMERAS 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 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 PRODUCT OPA360 OPA357 OPA355 OPA350 OPA692 THS412x 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. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright  2004−2005, Texas Instruments Incorporated www.ti.com OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 PACKAGE/ORDERING INFORMATION(1) PRODUCT PACKAGE PACKAGE DESIGNATOR DCK SPECIFIED TEMPERATURE RANGE −40°C to +85°C PACKAGE MARKING AUS ORDERING NUMBER OPA358AIDCKT OPA358AIDCKR TRANSPORT MEDIA, QUANTITY Tape and Reel, 250 Tape and Reel, 3000 OPA358 SC70-6 (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. ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage, V+ to V− . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.6V Signal Input Terminals, Voltage(2) . . . . (V−) −0.5V to (V+) + 0.5V Signal Input Terminals, Current(2) . . . . . . . . . . . . . . . . . . . . ±10mA Output Short-Circuit(3) . . . . . . . . . . . . . . . . . . . . . . . . . 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) 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. (3) Short-circuit to ground, one amplifier per package. 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. PIN CONFIGURATIONS OPA358 + In GND − In 1 6 V+ Enable Out AUS SC70−6(1) 2 3 5 4 (1) Pin 1 is determined by orienting the package marking as indicated in the diagram. 2 OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 ELECTRICAL CHARACTERISTICS: VS = +2.7V to +3.3V Single-Supply Boldface limits apply over the specified temperature range, TA = −40°C to +85°C. All specifications at TA = +25°C, RL = 150Ω connected to VS/2, unless otherwise noted. OPA358 PARAMETER OFFSET VOLTAGE Input Offset Voltage Over Temperature Drift vs. Power Supply INPUT BIAS CURRENT Input Bias Current Input Offset Current NOISE Input Voltage Noise Density INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection Ratio INPUT IMPEDANCE Differential Common-Mode OPEN-LOOP GAIN Open-Loop Voltage Gain Over Temperature 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 OUTPUT Voltage Output Swing from Rail Over Temperature Output Current(1) Open-Loop Output Impedance POWER SUPPLY Specified Voltage Range Minimum Operating Voltage Range Quiescent Current ENABLE/SHUTDOWN FUNCTION Disabled (logic−LOW Threshold) Enabled (logic−HIGH Threshold) Enable Time Disable Time Shutdown Current TEMPERATURE RANGE Specified Range Operating Range Storage Range Thermal Resistance SC70 IO AOL VS = +3.3V, 0.1V < VO < 3.1V VOS dVOS/dT CONDITIONS VS = +3.3V Specified Temperature Range Specified Temperature Range VS = +2.7V to +3.3V MIN TYP ±2 5 ±80 ±0.3 ±1 MAX ±6 ±15 ±350 ±50 ±50 UNITS mV mV µV/°C µV/V pA pA nV/√Hz PSRR IB IOS en VCM CMRR f = 1MHz (V−) − 0.1 60 60 6.4 (V+) − 1.0 80 VS = +3.3V, −0.1V < VCM < 2.3V Specified Temperature Range V dB dB Ω || pF Ω || pF dB 1013 || 1.5 1013 || 1.5 84 92 See Typical Characteristics 80 12 25 55 35 0.3 0.7 (V−) + 100 (V−) + 100 5 ±50 20 2.7 VS = +3.3V, Enabled, IO = 0 Specified Temperature Range 2.5 to 3.6 5.2 3.3 7.5 8.5 0.8 1.6 1.5 50 2.5 −40 −40 −65 qJA GBW f0.1dB f0.5dB SR G = +10, RL = 1kΩ G = +2, VO = 100mVPP, RF = 560Ω G = +2, VO = 100mVPP, RF = 560Ω VS = +3.3V, G = +2, 2.5V Output Step G = 1, RL = 150Ω PAL, RL = 150Ω PAL, RL = 150Ω VS = +3.3V, AOL > 84dB VS = +3.3V VS = +3.3V, VIN = 0V, RL = 150Ω to GND VS = +3.3V, 0.5V from Supplies f = 1MHz, IO = 0 MHz MHz MHz V/µs ns % ° (V+) − 200 (V+) − 300 mV mV mV mA Ω V V mA mA V V µs ns µA °C °C °C °C/W VS IQ VS = +3.3, Disabled 5 +85 +85 +150 250 (1) See typical characteristics chart, Output Voltage Swing vs Output Current. 3 OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 TYPICAL CHARACTERISTICS All specifications at TA = +25°C, RL = 150Ω connected to VS/2, unless otherwise noted. OPEN−LOOP GAIN AND PHASE vs FREQUENCY 200 180 160 Open−Loop Gain (dB) 140 120 100 80 60 40 20 0 − 20 100 1k 10k 100k 1M 10M 100M Gain Phase 200 180 160 Open−Loop Phase ( _ ) 140 120 100 80 60 40 20 0 − 20 1G PSRR and CMRR (dB) 80 100 POWER−SUPPLY AND COMMON−MODE REJECTION RATIO vs FREQUENCY +PSRR 60 CMRR 40 − PSRR 20 0 1k 10k 100k 1M 10M 100M Frequency (Hz) Frequency (MHz) GAIN FLATNESS vs FREQUENCY 1.0 G=2 0.5 Voltage Noise (nV/ √ Hz) Normalized Gain (dB) 1000 INPUT VOLTAGE NOISE SPECTRAL DENSITY 100 0 10 − 0.5 − 1.0 1 10 Frequency (MHz) 100 1 10 100 1k 10k 100k 1M 10M Frequency (Hz) OFFSET VOLTAGE PRODUCTION DISTRIBUTION Population DIFFERENTIAL GAIN INP = C A SYNC = INT −1 0 . 1 9 %1 DG1 0.28 % . DG2 0.30 % . DG3 0.30 % . DG4 0 . 2 8 %5 DG5 STEPS 4 5 DIFFERENTIAL PHASE INP = C A SYNC = INT −1 DP1 − 0 . 1 3 d g 1 DP2 0.16dg. DP3 0.47dg. DP4 0.66dg. DP5 0.69dg5 STEPS 4 5 MTIME = 1 0 LIN E = 330 +1 0 ZOOM 1 2 SAVE RESULTS MTIME = 1 0 LIN E = 330 +1 0 ZOOM 1 2 SAVE RESULTS −6 −5 −4 −3 −2 −1 0 1 2 3 4 5 Offset Voltage (mV) 4 6 OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 TYPICAL CHARACTERISTICS (continued) All specifications at TA = +25°C, RL = 150Ω connected to VS/2, unless otherwise noted. QUIESCENT CURRENT vs TEMPERATURE 8 7 Quiescent Current (mA) 3.0 Shutdown Current (µ A) 6 5 4 3 2 1 0 − 50 − 25 2.5 2.0 1.5 1.0 0.5 0 25 50 75 100 0 − 50 3.5 SHUTDOWN CURRENT vs TEMPERATURE Temperature (_ C) − 25 0 25 50 75 100 125 Temperature (_ C) INPUT BIAS CURRENT vs TEMPERATURE 10 110 100 Input Bias Current (pA) AOL, PSRR, CMRR (dB) 1 90 80 70 60 50 40 30 20 0.001 − 50 10 − 25 0 25 50 75 100 Temperature (_ C) OPEN−LOOP GAIN, COMMON−MODE REJECTION, AND POWER−SUPPLY REJECTION RATIO vs TEMPERATURE AOL PSRR 0.1 CMRR 0.01 0 − 50 − 25 0 25 50 75 100 Temperature (_ C) OUTPUT VOLTAGE vs OUTPUT CURRENT (V+) (V+) − 0.5 Output Voltage (V) (V+) − 1.0 (V+) − 1.5 (V− ) + 1.5 (V− ) + 1.0 (V− ) + 0.5 (V− ) 0 20 40 60 80 100 Output Current (mA) 85_ C −55_ C 25_ C 85_ C 25_ C 500mV/div − 55_ C G=2 LARGE−SIGNAL TRANSIENT Time (25ns/div) 5 OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 TYPICAL CHARACTERISTICS (continued) All specifications at TA = +25°C, RL = 150Ω connected to VS/2, unless otherwise noted. SMALL−SIGNAL TRANSIENT G=1 ENABLE FUNCTION Enabled 500mV/div 20mV/div Disabled VOUT Time (25ns/div) Time (500ns/div) 6 OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 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. Power-supply pins should be bypassed with a 100nF ceramic capacitor. 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. ENABLE/SHUTDOWN 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. 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. 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. INPUT VOLTAGE The input common-mode range of the OPA358 extends from (V−) − 0.1V to (V+) − 1.0V. 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 +3V 100nF VIN VOUT 75Ω Television 75Ω 1kΩ 1kΩ Figure 1. Typical Circuit Using the OPA358 in a Gain = 2 Configuration 7 OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 VIDEO PERFORMANCE Industry standard video test patterns include: D Multiburst—packets of different test frequencies to check for basic frequency response. D 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 amplitude, 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.) 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. 1 2 500Ω 500Ω a. Test circuit for Figure 3 through Figure 5. Figure 3. Multiburst (CCIR 18) Test Pattern (PAL) 1 2 500Ω 500Ω 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 OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 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. Figure 3 through Figure 5 show that the OPA358 causes no visible distortion or change in gain throughout the entire video frequency range. 220µF 75Ω G=2 75Ω 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. 47µF 1.3kΩ 499Ω 825Ω DC Gain = 2.8 AC Gain = 2 b) OPA358 with Sag Correction 75Ω 22µF 75Ω SAG CORRECTION 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 1kΩ Figure 7. Traditional Video Circuit vs OPA358 with Sag Correction 9 OPA358 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 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. 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. The disadvantage with DC-coupled output is that it uses somewhat higher supply current. Video DAC V+ = 2.7V to 3.3V Enable R OUT 75Ω (1) OPA358 75Ω R1 G=1+ R2 GND R1 R2 Television or VCR NOTE: (1) Optional 200Ω for use with TI’s digital media processors, and 500Ω for OMAP2420 and OMAP2430 processors. Figure 8. DC-Coupled Input/DC-Coupled Output +3.3 + 1 µF 10nF Signal #1 75Ω OPA358 1kΩ 75Ω VOUT 75Ω 1kΩ +3.3V + 1 µF 10nF Signal #2 75Ω OPA358 1kΩ 1kΩ HCO4 BON Select AON Figure 9. Multiplexed Output 10 OPA358 www.ti.com SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005 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. 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. 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. CF