OPA354-Q1 OPA2354-Q1 www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009 250 MHz, RAIL-TO-RAIL I/O, CMOS OPERATIONAL AMPLIFIERS FEATURES APPLICATIONS • • • • • • • • • • • • • • • • 1 • • • • Qualified for Automotive Applications Unity-Gain Bandwidth: 250 MHz Wide Bandwidth: 100-MHz GBW High Slew Rate: 150 V/μs Low Noise: 6.5 nV/√Hz Rail-to-Rail I/O High Output Current: >100 mA Excellent Video Performance – Differential Gain Error: 0.02% – Differential Phase Error: 0.09° – 0.1-dB Gain Flatness: 40 MHz Low Input Bias Current: 3 pA Quiescent Current: 4.9 mA Thermal Shutdown Supply Range: 2.5 V to 5.5 V • • Video Processing Ultrasound Optical Networking, Tunable Lasers Photodiode Transimpedance Amplifiers Active Filters High-Speed Integrators Analog-to-Digital (A/D) Converter Input Buffers Digital-to-Analog (D/A) Converter Output Amplifiers Barcode Scanners Communications V+ −In OPA354 VOUT +In V− DESCRIPTION The OPA354 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 4.9 mA per channel. The OPA354 series op amps are optimized for operation on single or dual supplies as low as 2.5 V (±1.25 V) and up to 5.5 V (±2.75 V). Common-mode input range extends beyond the supplies. The output swing is within 100 mV of the rails, supporting wide dynamic range. The single version (OPA354), is available in the tiny SOT23-5 (DBV) package. The dual version (OPA2354) comes in the miniature MSOP-8 (DGK) package and features completely independent circuitry for lowest crosstalk and freedom from interaction. The devices are specified over the automotive temperature range of –40°C to 125°C. Table 1. OPAx354 RELATED PRODUCTS FEATURES PRODUCT Shutdown Version of OPA354 Family OPAx357 200-MHz GBW, Rail-to-Rail Output, CMOS, Shutdown OPAx355 200-MHz GBW, Rail-to-Rail Output, CMOS OPAx356 38-MHz GBW, Rail-to-Rail Input/Output, CMOS OPAx350/3 75-MHz BW, G = 2, Rail-to-Rail Output OPAx631 150-MHz BW, G = 2, Rail-to-Rail Output OPAx634 100-MHz BW, Differential Input/Output, 3.3-V Supply THS412x 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2009, Texas Instruments Incorporated OPA354-Q1 OPA2354-Q1 SBOS492A – JUNE 2009 – REVISED AUGUST 2009 ....................................................................................................................................................... www.ti.com 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. ORDERING INFORMATION (1) TA –40°C to 125°C (1) (2) PACKAGE (2) ORDERABLE PART NUMBER TOP-SIDE MARKING SOT-23 – DBV Reel of 3000 OPA354AQDBVRQ1 OSFQ MSOP – DGK Reel of 2500 OPA2354AQDGKRQ1 OSLQ For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. OPA354 DBV PACKAGE (TOP VIEW) Out 1 V– 2 +In 3 5 4 OPA2354 DGK PACKAGE (TOP VIEW) V+ –In Out A 1 8 V+ –In A 2 7 Out B +In A 3 6 –In B V– 4 5 +In B ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) VS Supply voltage, V+ to V– VIN Signal input terminals voltage 7.5 V (V– – 0.5 V) to (V+ + 0.5 V) Output short-circuit duration Continuous DBV package 150°C/W θJA Thermal impedance, junction to free air TOP Operating temperature –55°C to 150°C TSTG Storage temperature –65°C to 150°C TJ Junction temperature 150°C TLEAD Lead temperature (soldering, 10 s) 300°C (1) DGK package 150°C/W Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS MIN MAX UNIT VS Supply voltage, V– to V+ 2.5 5.5 V TA Operating free-air temperature –40 125 °C 2 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated OPA354-Q1 OPA2354-Q1 www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009 ELECTRICAL CHARACTERISTICS VS = 2.5 V to 5.5 V, RF = 0 Ω, RL = 1 kΩ connected to VS/2 (unless otherwise noted) PARAMETER TEST CONDITIONS VS = 5 V, VCM = (V–) + 0.8 V TA (1) MIN 25°C TYP MAX ±2 ±8 UNIT VOS Input offset voltage ΔVOS/ΔT Offset voltage drift over temperature PSRR Offset voltage drift vs power supply IB Input bias current 25°C 3 ±50 pA IOS Input offset current 25°C ±1 ±50 pA Vn Input voltage noise density f = 1 MHz 25°C 6.5 nV/√Hz In Input current noise density f = 1 MHz 25°C 50 fA/√Hz VCM Input common-mode voltage range VS = 2.7 V to 5.5 V, VCM = VS/2 – 0.15 V Input common-mode rejection ratio VS = 5.5 V, –0.1 V < VCM < 5.6 V mV ±10 Full range VS = 5.5 V, –0.1 V < VCM < 3.5 V CMRR Full range μV/°C ±4 25°C ±200 Full range ±800 ±900 25°C V– – 0.1 25°C 66 Full range 64 25°C 56 Full range 55 μV/V V+ + 0.1 V 80 dB 68 ZID Differential input impedance 25°C 1013 || 2 Ω || pF ZICM Common-mode input impedance 25°C 1013 || 2 Ω || pF AOL Open-loop gain f–3dB Small-signal bandwidth GBW Gain-bandwidth product G = +10 25°C 100 MHz f0.1dB Bandwidth for 0.1-dB gain flatness G = +2, VO = 100 mVp-p 25°C 40 MHz VS = 5 V, G = +1, 4-V step 25°C 150 SR Slew rate trf Rise-and-fall time VS = 5 V, 0.3 V < VO < 4.7 V 25°C 94 VS = 5 V, 0.4 V < VO < 4.6 V Full range 90 G = +1, VO = 100 mVp-p, RF = 25 Ω G = +2, VO = 100 mVp-p 25°C 130 110 25°C Settling time 0.1% V/μs 2 ns 11 30 VS = 5 V, G = +1, 2-V output step 25°C Overload recovery time VIN × Gain = VS 25°C 5 Second-order harmonic distortion G = +1, f = 1 MHz, VO = 2 Vp-p, RL = 200 Ω, VCM = 1.5 V 25°C –75 dBc Third-order harmonic distortion G = +1, f = 1 MHz, VO = 2 Vp-p, RL = 200 Ω, VCM = 1.5 V 25°C –83 dBc Differential gain error NTSC, RL = 150 Ω 25°C 0.02 % Differential phase error NTSC, RL = 150 Ω 25°C 0.09 ° Channel-to-channel crosstalk (OPA2354) f = 5 MHz 25°C –100 dB VS = 5 V, RL = 1 kΩ, AOL > 94 dB 25°C 0.1 VS = 5 V, RL = 1 kΩ, AOL > 90 dB Full range 0.01% Voltage output swing from rail (1) MHz 90 VS = 3 V, G = +1, 2-V step G = +1, VO = 200 mVp-p, 10% to 90% dB 250 VS = 5 V, G = +1, 2-V step G = +1, VO = 2 Vp-p, 10% to 90% tsettle 110 ns 60 ns 0.3 0.4 V Full range TA = –40°C to 125°C Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 3 OPA354-Q1 OPA2354-Q1 SBOS492A – JUNE 2009 – REVISED AUGUST 2009 ....................................................................................................................................................... www.ti.com ELECTRICAL CHARACTERISTICS (continued) VS = 2.5 V to 5.5 V, RF = 0 Ω, RL = 1 kΩ connected to VS/2 (unless otherwise noted) PARAMETER IO Output current (2) TEST CONDITIONS (3) Closed-loop output impedance RO Open-loop output resistance IQ Quiescent current (per amplifier) Thermal shutdown junction temperature (2) (3) 4 TA (1) VS = 5 V TYP MAX 100 VS = 3 V 25°C UNIT mA 50 f < 100 kHz VS = 5 V, IO = 0, Enabled MIN 0.05 Ω 35 Ω 4.9 Full range 6 7.5 Shutdown 160 Reset from shutdown 140 mA °C See typical characteristic graph Output Voltage Swing vs Output Current. Not production tested Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated OPA354-Q1 OPA2354-Q1 www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009 TYPICAL CHARACTERISTICS TA = 25°C, VS = 5 V, RF = 0 Ω, RL = 1 kΩ connected to VS/2 (unless otherwise noted) NONINVERTING SMALL−SIGNAL FREQUENCY RESPONSE 3 3 G = +1 RF = 25Ω VO = 0.1VPP VO = 0.1VPP, RF = 604Ω 0 Normalized Gain (dB) 0 Normalized Gain (dB) INVERTING SMALL−SIGNAL FREQUENCY RESPONSE G = +2, RF = 604Ω −3 G = +5, RF = 604Ω −6 G = +10, RF = 604Ω −9 −12 −3 G = −1 −6 G = −5 G = −10 −12 −15 100k 1M 10M Frequency (Hz) 100M −15 100k 1G 1M 10M Frequency (Hz) 100M 1G NONINVERTING LARGE−SIGNAL STEP RESPONSE Output Voltage (40mV/div) Output Voltage (500mV/div) NONINVERTING SMALL−SIGNAL STEP RESPONSE Time (20ns/div) Time (20ns/div) 0.1dB GAIN FLATNESS 0.5 0.4 VO = 0.1VPP 0.3 G = +1 RF = 25Ω 0.2 0.1 0 −0.1 −0.2 G = +2 RF = 604Ω −0.3 −0.4 −0.5 100k HARMONIC DISTORTION vs OUTPUT VOLTAGE −50 Harmonic Distortion (dBc) Normalized Gain (dB) G = −2 −9 G = −1 f = 1MHz RL = 200Ω −60 −70 2nd−Harmonic −80 −90 3rd−Harmonic −100 1M 10M Frequency (Hz) Copyright © 2009, Texas Instruments Incorporated 100M 1G 0 1 2 Output Voltage (VPP) 3 Submit Documentation Feedback 4 5 OPA354-Q1 OPA2354-Q1 SBOS492A – JUNE 2009 – REVISED AUGUST 2009 ....................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 5 V, RF = 0 Ω, RL = 1 kΩ connected to VS/2 (unless otherwise noted) HARMONIC DISTORTION vs NONINVERTING GAIN −50 −70 2nd−Harmonic −80 −90 VO = 2VPP f = 1MHz RL = 200Ω −60 Harmonic Distortion (dBc) −60 Harmonic Distortion (dBc) HARMONIC DISTORTION vs INVERTING GAIN −50 VO = 2VPP f = 1MHz RL = 200Ω −70 2nd−Harmonic −80 3rd−Harmonic −90 3rd−Harmonic −100 −100 1 10 1 10 Gain (V/V) HARMONIC DISTORTION vs FREQUENCY −50 HARMONIC DISTORTION vs LOAD RESISTANCE −50 G = +1 VO = 2VPP RL = 200Ω VCM = 1.5V −70 2nd−Harmonic −80 3rd−Harmonic −90 −100 100k G = +1 VO = 2VPP f = 1MHz VCM = 1.5V −60 Harmonic Distortion (dBc) Harmonic Distortion (dBc) −60 Gain (V/V) −70 2nd−Harmonic −80 3rd−Harmonic −90 −100 1M Frequency (Hz) 10M 100 1k RL (Ω) FREQUENCY RESPONSE FOR VARIOUS RL INPUT VOLTAGE AND CURRENT NOISE SPECTRAL DENSITY vs FREQUENCY 3 10k RL = 10kΩ Normalized Gain (dB) Voltage Noise (nV/√Hz), Current Noise (fA/√Hz) 0 1k Current Noise Voltage Noise 100 −3 −6 G = +1 R F = 0Ω VO = 0.1VPP C L = 0pF RL = 1kΩ RL = 100Ω −9 RL = 50Ω −12 10 −15 100k 1 10 100 1k 10k 100k 1M 10M 100M 1M 10M Frequency (Hz) 100M 1G Frequency (Hz) 6 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated OPA354-Q1 OPA2354-Q1 www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009 TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 5 V, RF = 0 Ω, RL = 1 kΩ connected to VS/2 (unless otherwise noted) FREQUENCY RESPONSE FOR VARIOUS CL RECOMMENDED RS vs CAPACITIVE LOAD 9 160 G = +1 VO = 0.1VPP R S = 0Ω Normalized Gain (dB) 6 3 For 0.1dB Flatness 140 CL = 100pF 120 0 RS (Ω) 100 −3 CL = 47pF −6 80 60 VIN −9 CL 1kΩ 20 −15 100k 0 1M 10M Frequency (Hz) 100M 1G 1 G = +1 VO = 0.1VPP 0 1k 10 100 Capacitive Load (pF) COMMON−MODE REJECTION RATIO AND POWER−SUPPLY REJECTION RATIO vs FREQUENCY FREQUENCY RESPONSE vs CAPACITIVE LOAD 3 CL = 5.6pF, RS = 0Ω 100 CMRR 80 CL = 47pF, RS = 140Ω −3 CMRR, PSRR (dB) Normalized Gain (dB) VO OPA354 CL = 5.6pF −12 CL = 100pF, RS = 120Ω −6 −9 VIN RS VO OPA354 −12 CL PSRR+ 60 PSRR− 40 1kΩ 20 −15 100k 1M 10M Frequency (Hz) 0 1G 100M 10k 100k 1M 10M Frequency (Hz) 100M 1G COMPOSITE VIDEO DIFFERENTIAL GAIN AND PHASE OPEN−LOOP GAIN AND PHASE 180 0.8 160 140 0.7 120 Phase 100 dG/dP (%/degrees) Open−Loop Phase (degrees) Open−Loop Gain (dB) RS 40 80 60 40 Gain 20 0 −20 0.6 0.5 dP 0.4 0.3 0.2 0.1 −40 10 100 1k 10k 100k 1M Frequency (Hz) 10M 100M 1G dG 0 1 2 3 4 Number of 150Ω Loads Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 7 OPA354-Q1 OPA2354-Q1 SBOS492A – JUNE 2009 – REVISED AUGUST 2009 ....................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 5 V, RF = 0 Ω, RL = 1 kΩ connected to VS/2 (unless otherwise noted) INPUT BIAS CURRENT vs TEMPERATURE OUTPUT VOLTAGE SWING vs OUTPUT CURRENT FOR VS = 3V 10k 1k Output Voltage (V) Input Bias Current (pA) 3 100 10 2 +125_ C +25_ C −55_ C 1 1 −55 −35 −15 5 25 45 65 Temperature (_C) 85 105 125 135 0 0 20 40 60 80 100 120 Output Current (mA) SUPPLY CURRENT vs TEMPERATURE OUTPUT VOLTAGE SWING vs OUTPUT CURRENT FOR VS = 5V 7 5 VS = 5V 4 5 Output Voltage (V) Supply Current (mA) 6 4 VS = 2.5V 3 2 1 3 −55_C +25_ C +125_ C 2 1 0 −55 −35 −15 5 25 45 65 Temperature (_ C) 85 105 125 135 0 0 25 50 75 100 125 150 175 200 Output Current (mA) CLOSED−LOOP OUTPUT IMPEDANCE vs FREQUENCY MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 100 6 VS = 5.5V 10 Output Voltage (VPP) Output Impedance (Ω) 5 1 0.1 Maximum Output Voltage without Slew−Rate Induced Distortion 4 3 VS = 2.7V 2 OPA354 1 ZO 0.01 100k 8 0 1M 10M Frequency (Hz) Submit Documentation Feedback 100M 1G 1 10 100 Frequency (MHz) Copyright © 2009, Texas Instruments Incorporated OPA354-Q1 OPA2354-Q1 www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009 TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 5 V, RF = 0 Ω, RL = 1 kΩ connected to VS/2 (unless otherwise noted) OUTPUT SETTLING TIME TO 0.1% OPEN−LOOP GAIN vs TEMPERATURE 120 0.5 0.4 Open−Loop Gain (dB) Output Error (%) RL = 1kΩ VO = 2VPP 0.3 0.2 0.1 0 −0.1 −0.2 −0.3 110 100 90 80 −0.4 −0.5 70 0 10 20 30 40 50 60 70 80 90 −55 100 −35 −15 5 Time (ns) 25 45 65 Temperature (_ C) 85 105 125 135 COMMON−MODE REJECTION RATIO AND POWER−SUPPLY REJECTION RATIO vs TEMPERATURE OFFSET VOLTAGE PRODUCTION DISTRIBUTION 100 Population CMRR, PSRR (dB) 90 Common−Mode Rejection Ratio 80 Power−Supply Rejection Ratio 70 60 −8 −7 −6 −5 −4 −3 −2 −1 0 1 2 3 Offset Voltage (mV) 4 5 6 50 7 8 −55 −35 −15 5 25 45 65 85 105 125 135 Temperature (_ C) CHANNEL−TO−CHANNEL CROSSTALK Crosstalk, Input−Referred (dB) 0 −20 −40 −60 OPA2354 −80 −100 −120 100k 1M 10M 100M 1G Frequency (Hz) Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 9 OPA354-Q1 OPA2354-Q1 SBOS492A – JUNE 2009 – REVISED AUGUST 2009 ....................................................................................................................................................... www.ti.com APPLICATION INFORMATION The OPA354 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 amplifier features a 100-MHz gain bandwidth, and 150 V/μs slew rate, but it is unity-gain stable and can be operated as a +1-V/V voltage follower. Operating Voltage The OPA354 is specified over a power-supply range of 2.7 V to 5.5 V (±1.35 V to ±2.75 V). However, the supply voltage may range from 2.5 V to 5.5 V (±1.25 V to ±2.75 V). Supply voltages higher than 7.5 V (absolute maximum) can permanently damage the amplifier. Parameters that vary over supply voltage or temperature are shown in the typical characteristics section of this data sheet. Rail-to-Rail Input The specified input common-mode voltage range of the OPA354 extends 100 mV beyond the supply rails. This is achieved with a complementary input stage—an 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+) – 1.2 V to 100 mV above the positive supply, while the P-channel pair is on for inputs from 100 mV below the negative supply to approximately (V+) – 1.2 V. There is a small transition region, typically (V+) – 1.5 V to (V+) – 0.9 V, in which both pairs are on. This 600-mV transition region can vary ±500 mV with process variation. Thus, the transition region (both input stages on) can range from (V+) – 2.0 V to (V+) – 1.5 V on the low end, up to (V+) – 0.9 V to (V+) – 0.4 V on the high end. 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 Circuitry VO VBIAS2 V− (Ground) Figure 1. Simplified Schematic Rail-to-Rail Output A class AB output stage with common-source transistors is used to achieve rail-to-rail output. For high-impedance loads (> 200 Ω), the output voltage swing is typically 100 mV from the supply rails. With 10-Ω 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. 10 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated OPA354-Q1 OPA2354-Q1 www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009 Output Drive The OPA354's output stage can supply a continuous output current of ±100 mA and still provide approximately 2.7-V output swing on a 5-V supply, as shown in Figure 2. R2 1kΩ + − C1 50pF V1 5V 1µF R1 10kΩ V+ OPA354 + VIN R3 10kΩ V− RSHUNT 1Ω R4 1kΩ − 1V In = 100mA Out, as Shown Laser Diode Figure 2. Laser Diode Driver For maximum reliability, it is not recommended to run a continuous dc current in excess of ±100 mA. See the typical characteristic curve Output Voltage Swing vs Output Current. For supplying continuous output currents greater than ±100 mA, the OPA354 may be operated in parallel, as shown in Figure 3. R2 10kΩ C1 200pF +5V 1µF R1 100kΩ R5 1Ω OPA2354 R3 100kΩ + − R6 1Ω 2V In = 200mA Out, as Shown RSHUNT 1Ω OPA2354 R4 10kΩ Laser Diode Figure 3. Parallel Operation The OPA354 provides peak currents up to 200 mA, which corresponds to the typical short-circuit current. Therefore, an on-chip thermal shutdown circuit is provided to protect the OPA354 from dangerously high junction temperatures. At 160°C, the protection circuit shuts down the amplifier. Normal operation resumes when the junction temperature cools to below 140°C. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 11 OPA354-Q1 OPA2354-Q1 SBOS492A – JUNE 2009 – REVISED AUGUST 2009 ....................................................................................................................................................... www.ti.com Video The OPA354 output stage is capable of driving standard back-terminated 75-Ω video cables (see Figure 4). By back-terminating a transmission line, it does not exhibit a capacitive load to its driver. A properly back-terminated 75-Ω cable does not appear as capacitance; it presents only a 150-Ω resistive load to the OPA354 output. +5V Video In 75Ω OPA354 75Ω Video Output +2.5V 604Ω 604Ω +2.5V Figure 4. Single-Supply Video Line Driver The OPA354 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). 604Ω +3V + V+ 10nF 604Ω 75Ω 1/2 OPA2354 R1 Red(1) 1µF Red 75Ω R2 V+ R1 Green(1) R2 604Ω 75Ω 1/2 OPA2354 Green 75Ω 604Ω NOTE: (1) Source video signal offset 300mV above ground to accomodate op amp swing−to−ground capability. 604Ω +3V + V+ 1µF 10nF 604Ω 75Ω Blue(1) R1 OPA354 Blue 75Ω R2 Figure 5. RGB Cable Driver 12 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated OPA354-Q1 OPA2354-Q1 www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009 Driving Analog-to-Digital Converters The OPA354 series op amps offer 60-ns settling time to 0.01%, making them a good choice for driving high- and medium-speed sampling A/D converters and reference circuits. The OPA354 series provide an effective means of buffering the A/D converter's input capacitance and resulting charge injection while providing signal gain. For applications requiring high DC accuracy, the OPA350 series is recommended. Figure 6 shows the OPA354 driving an A/D converter. With the OPA354 in an inverting configuration, a capacitor across the feedback resistor can be used to filter high-frequency noise in the signal. +5V 330pF 5kΩ 5kΩ VIN VREF V+ ADS7816, ADS7861, or ADS7864 12−Bit A/D Converter +In OPA354 +2.5V −In GND VIN = 0V to −5V for 0V to 5V output. NOTE: A/D Converter Input = 0V to VREF Figure 6. OPA354 Inverting Configuration Driving the ADS7816 Capacitive Load and Stability The OPA354 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 resistance, to create a pole in the small-signal response that degrades the phase margin. See the typical characteristic curve Frequency Response vs Capacitive Load for details. The OPA354'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 curve Recommended RS vs Capacitive Load and Frequency Response vs Capacitive Load for details. One method of improving capacitive load drive in the unity-gain configuration is to insert a 10-Ω to 20-Ω resistor in series with the output, as shown in Figure 7. This significantly reduces ringing with large capacitive loads—see 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 = 10 kΩ and RS = 20 Ω, there is only about a 0.2% error at the output. V+ RS VOUT OPA354 VIN RL CL Figure 7. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 13 OPA354-Q1 OPA2354-Q1 SBOS492A – JUNE 2009 – REVISED AUGUST 2009 ....................................................................................................................................................... www.ti.com Wideband Transimpedance Amplifier Wide bandwidth, low input bias current, and low input voltage and current noise make the OPA354 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. The key elements to a transimpedance design, as shown in Figure 8, are the expected diode capacitance (including the parasitic input common-mode and differential-mode input capacitance (2 + 2) pF for the OPA354), the desired transimpedance gain (RF), and the gain-bandwidth product (GBW) for the OPA354 (100 MHz). With these three variables set, the feedback capacitor value (CF) may be set to control the frequency response. CF < 1pF (prevents gain peaking) RF 10MΩ +V λ CD OPA354 VOUT Figure 8. Transimpedance Amplifier To achieve a maximally flat second-order Butterworth frequency response, the feedback pole should be set as shown in Equation 1. 1 + 2pR FCF GBP Ǹ4pR C F D (1) Typical surface-mount resistors have a parasitic capacitance of around 0.2 pF that must be deducted from the calculated feedback capacitance value. Bandwidth is calculated as shown in Equation 2. f *3dB + GBP Hz Ǹ2pR C F D (2) For even higher transimpedance bandwidth, the high-speed CMOS OPA355 (200-MHz GBW) or the OPA655 (400-MHz GBW) may be used. PCB Layout Good high-frequency printed circuit board (PCB) layout techniques should be employed for the OPA354. Generous use of ground planes, short and direct signal traces, and a suitable bypass capacitor located at the V+ pin assures clean stable operation. Large areas of copper also provides a means of dissipating heat that is generated in normal operation. Sockets are not recommended for use with any high-speed amplifier. A 10-nF ceramic bypass capacitor is the minimum recommended value; adding a 1-μF 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. 14 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated OPA354-Q1 OPA2354-Q1 www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009 Power Dissipation Power dissipation depends on power-supply voltage, signal and load conditions. With dc signals, power dissipation is equal to the product of output current times the voltage across the conducting output transistor, VS – VO. Power dissipation can be minimized by using the lowest possible power-supply voltage necessary to assure the required output voltage swing. 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. Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate heatsink. 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 the application. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 15 PACKAGE OPTION ADDENDUM www.ti.com 16-Aug-2012 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) OPA2354AQDGKRQ1 ACTIVE VSSOP DGK 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR OPA354AQDBVRQ1 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Samples (Requires Login) (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. 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. 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OTHER QUALIFIED VERSIONS OF OPA2354-Q1 : • Catalog: OPA2354 NOTE: Qualified Version Definitions: Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com 16-Aug-2012 • Catalog - TI's standard catalog product Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant OPA2354AQDGKRQ1 VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 OPA354AQDBVRQ1 SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA2354AQDGKRQ1 VSSOP DGK 8 2500 367.0 367.0 35.0 OPA354AQDBVRQ1 SOT-23 DBV 5 3000 195.0 200.0 45.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. 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