OPA689U

® OPA 689 OPA689 OPA 689 For most current data sheet and other product information, visit www.burr-brown.com Wideband, High Gain VOLTAGE LIMITING AMPLIFIER FEATURES q HIGH LINEARITY NEAR LIMITING q FAST RECOVERY FROM OVERDRIVE: 2.4ns q LIMITING VOLTAGE ACCURACY: ±15mV q –3dB BANDWIDTH (G = +6): 280MHz q STABLE FOR G ≥ +4 q SLEW RATE: 1600V/µs q ±5V AND +5V SUPPLY OPERATION q LOW GAIN VERSION: OPA688 APPLICATIONS q TRANSIMPEDANCE WITH FAST OVERDRIVE RECOVERY q FAST LIMITING ADC INPUT DRIVER q LOW PROP DELAY COMPARATOR q NON-LINEAR ANALOG SIGNAL PROCESSING q DIFFERENCE AMPLIFIER q IF LIMITING AMPLIFIER q AM SIGNAL GENERATION DESCRIPTION The OPA689 is a wideband, voltage feedback op amp that offers bipolar output voltage limiting, and is stable for gains ≥ +4. Two buffered limiting voltages take control of the output when it attempts to drive beyond these limits. This new output limiting architecture holds the limiter offset error to ±15mV. The op amp operates linearly to within 30mV of the limits. The combination of narrow nonlinear range and low limiting offset allows the limiting voltages to be set within 100mV of the desired linear output range. A fast 2.4ns recovery from limiting ensures that overdrive signals will be transparent to the signal channel. Implementing the LIMITED OUTPUT RESPONSE 2.5 2.0 2.10 G = +6 VH = 2.0V VL = –2.0V 2.05 limiting function at the output, as opposed to the input, gives the specified limiting accuracy for any gain, and allows the OPA689 to be used in all standard op amp applications. Non-linear analog signal processing circuits will benefit from the OPA689’s sharp transition from linear operation to output limiting. The quick recovery time supports high speed applications. The OPA689 is available in an industry-standard pinout in PDIP-8 and SO-8 packages. For lower gain applications requiring output limiting with fast recovery, consider the OPA688. DETAIL OF LIMITED OUTPUT VOLTAGE Input and Output Voltage (V) Input and Output Voltage (V) 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 Time (200ns/div) VIN 2.00 1.95 1.90 1.85 1.80 1.75 1.70 1.65 1.60 Time (50ns/div) VO VO International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 ® © 1997 Burr-Brown Corporation PDS-1409D 1 Printed in U.S.A. January, 2000 OPA689 SPECIFICATIONS — VS = ±5V G = +6, RL = 500Ω, RF = 750Ω, VH = –VL = 2V, (Figure 1 for AC performance only), unless otherwise noted. OPA689U, P TYP +25°C +25°C GUARANTEED(1) 0°C to +70°C –40°C to +85°C MIN/ TEST MAX LEVEL(2) PARAMETER AC PERFORMANCE (see Fig. 1) Small Signal Bandwidth CONDITIONS UNITS Gain Bandwidth Product (G ≥ +20) Gain Peaking 0.1dB Gain Flatness Bandwidth Large Signal Bandwidth Step Response Slew Rate Rise/Fall Time Settling Time: 0.05% Spurious Free Dynamic Range Differential Gain Differential Phase Input Noise Density Voltage Noise Current Noise DC PERFORMANCE (VCM = 0V) Open-Loop Voltage Gain (AOL) Input Offset Voltage Average Drift Input Bias Current(3) Average Drift Input Offset Current Average Drift INPUT Common-Mode Rejection Ratio Common-Mode Input Range(4) Input Impedance Differential-Mode Common-Mode OUTPUT Output Voltage Range Current Output, Sourcing Sinking Closed-Loop Output Impedance POWER SUPPLY Operating Voltage, Specified Maximum Quiescent Current, Maximum Minimum Power Supply Rejection Ratio +PSR (Input Referred) OUTPUT VOLTAGE LIMITERS Default Limit Voltage Minimum Limiter Separation (VH – VL) Maximum Limit Voltage Limiter Input Bias Current Magnitude(5) Maximum Minimum Average Drift Limiter Input Impedance Limiter Feedthrough(6) DC Performance in Limit Mode Limiter Offset Voltage Op Amp Input Bias Current Shift(3) VO < 0.5Vp-p G = +6 G = +12 G = –6 VO < 0.5Vp-p VO < 0.5Vp-p, G = +4 VO < 0.5Vp-p VO = 2Vp-p 2V Step 0.5V Step 2V Step f = 5MHz, VO = 2Vp-p NTSC, PAL, RL = 500Ω NTSC, PAL, RL = 500Ω f ≥ 1MHz f ≥ 1MHz VO = ±0.5V 280 90 220 720 8 110 290 1600 1.2 7 61 0.02 0.01 4.6 2.0 56 ±1 — +8 — ±0.3 — 60 ±3.3 0.4 || 1 1 || 1 220 — — 490 — — 185 1300 1.8 — 57 — — 5.3 2.5 50 — 210 — — 460 — — 175 1250 1.9 — 53 — — 6.0 2.9 48 ±6 ±14 ±13 –60 ±3 ±10 52 ±3.2 — — ±3.9 85 –65 — — ±6 19 12.8 57 ±3.0 200 ±4.3 68 34 40 — — ±40 — 200 — — 430 — — 170 950 2.4 — 48 — — 6.1 3.6 47 ±7 ±14 ±20 –90 ±4 ±10 50 ±3.1 — — ±3.8 80 –60 — — ±6 20 11 55 ±2.9 200 ±4.3 70 31 45 — — ±40 — MHz MHz MHz MHz dB MHz MHz V/µs ns ns dB % ° nV/√Hz pA/√Hz dB mV µV/°C µA nA/°C µA nA/°C dB V MΩ || pF MΩ || pF V mA mA Ω V V mA mA dB V mV V µA µA nA/°C MΩ || pF dB mV µA Min Typ Typ Min Typ Typ Min Min Max Typ Min Typ Typ Max Max Min Max Max Max Max Max Max Min Min Typ Typ Min Min Min Typ Typ Max Max Min Min Min Min Max Max Min Max Typ Typ Max Typ B C C B C C B B B C B C C B B A A B A B A B A A C C A A A C C A A A A A B B A A B C C A C ±5 — ±12 ±2 — 53 ±3.2 — — Input Referred, VCM = ±0.5V VH = –VL = 4.3V RL ≥ 500Ω G = +4, f < 100kHz ±4.1 105 –85 0.8 ±5 — 15.8 15.8 ±3.9 90 –70 — — ±6 17 14 58 +VS = 4.5V to 5.5V 65 Limiter Pins Open ±3.3 200 — 54 54 — 2 || 1 –60 ±15 3 ±3.0 200 ±4.3 65 35 — — — VO = 0 f = 5MHz VIN = ±0.7V (VO – VH) or (VO – VL) ±35 — ® OPA689 2 SPECIFICATIONS — VS = ±5V (cont.) OPA689U, P TYP +25°C +25°C GUARANTEED(1) 0°C to +70°C –40°C to +85°C MIN/ TEST MAX LEVEL(2) G = +6, RL = 500Ω, RF = 750Ω, VH = –VL = 2V, (Figure 1 for AC performance only), unless otherwise noted. PARAMETER OUTPUT VOLTAGE LIMITERS (CONT) AC Performance in Limit Mode Limiter Small Signal Bandwidth Limiter Slew Rate(7) Limited Step Response Overshoot Recovery Time Linearity Guardband(8) THERMAL CHARACTERISTICS Temperature Range Thermal Resistance P 8-Pin DIP U 8-Pin SO-8 CONDITIONS UNITS VIN = ±0.7V, VO < 0.02Vp-p VIN = 0 to ±0.7V Step VIN = ±0.7V to 0 Step f = 5MHz, VO = 2Vp-p Specification: P, U 450 100 250 2.4 30 –40 to +85 100 125 — — — 2.8 — — — — — — — 3.0 — — — — — — — 3.2 — — — — MHz V/µs mV ns mV °C °C/W °C/W Typ Typ Typ Max Typ Typ Typ Typ C C C B C C C C NOTES: (1) Junction Temperature = Ambient Temperature for low temperature limit and 25 °C guaranteed specifications. Junction Temperature = Ambient Temperature + 23°C at high temperature limit guaranteed specifications. (2) TEST LEVELS: (A) 100% tested at 25 °C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation. (C) Typical value for information only. (3) Current is considered positive out of node. (4) CMIR tested as < 3dB degradation from minimum CMRR at specified limits. (5) I VH (VH bias current) is positive, and IVL (VL bias current) is negative, under these conditions. See Note 3 and Figures 1 and 7. (6) Limiter feedthrough is the ratio of the output magnitude to the sinewave added to V H (or VL) when VIN = 0. (7) VH slew rate conditions are: V IN = +0.7V, G = +6, VL = –2V, VH = step between 2V and 0V. VL slew rate conditions are similar. (8) Linearity Guardband is defined for an output sinusoid (f = 1MHz, VO = 2Vpp) centered between the limiter levels (VH and VL). It is the difference between the limiter level and the peak output voltage where SFDR decreases by 3dB (see Figure 8). The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® 3 OPA689 SPECIFICATIONS — VS = +5V G = +6, RF = 750Ω, RL = 500Ω tied to VCM = 2.5V, VL = VCM –1.2V, VH = VCM +1.2V, (Figure 2 for AC performance only), unless otherwise noted. OPA689U, P TYP +25°C +25°C GUARANTEED(1) 0°C to +70°C –40°C to +85°C MIN/ TEST MAX LEVEL(2) PARAMETER AC PERFORMANCE (see Fig. 2) Small Signal Bandwidth CONDITIONS VO < 0.5Vp-p G = +6 G = +12 G = –6 VO < 0.5Vp-p VO < 0.5Vp-p, G = +4 VO < 0.5Vp-p VO = 2Vp-p 2V Step 0.5V Step 2V Step f = 5MHz, VO = 2Vp-p f ≥ 1MHz f ≥ 1MHz VO = ±0.5V UNITS Gain Bandwidth Product (G ≥ +20) Gain Peaking 0.1dB Gain Flatness Bandwidth Large Signal Bandwidth Step Response Slew Rate Rise/Fall Time Settling Time: 0.05% Spurious Free Dynamic Range Input Noise Voltage Noise Density Current Noise Density DC PERFORMANCE Open-Loop Voltage Gain (AOL) Input Offset Voltage Average Drift Input Bias Current(3) Average Drift Input Offset Current Average Drift INPUT Common-Mode Rejection Ratio Common-Mode Input Range(4) Input Impedance Differential-Mode Common-Mode OUTPUT Output Voltage Range Current Output, Sourcing Sinking Closed-Loop Output Impedance POWER SUPPLY Operating Voltage, Specified Maximum Quiescent Current, Maximum Minimum Power Supply Rejection Ratio +PSR (Input Referred) OUTPUT VOLTAGE LIMITERS Default Limiter Voltage Minimum Limiter Separation (VH – VL) Maximum Limit Voltage Limiter Input Bias Current Magnitude(5) Maximum Minimum Average Drift Limiter Input Impedance Limiter Isolation(6) DC Performance in Limit Mode Limiter Voltage Accuracy Op Amp Bias Current Shift(3) AC Performance in Limit Mode Limiter Small Signal Bandwidth Limiter Slew Rate(7) Limited Step Response Overshoot Recovery Time Linearity Guardband(8) 210 70 180 440 4 35 175 1600 1.9 7 59 4.6 2.0 56 ±1 — +8 — ±0.3 — 58 VCM ±0.8 0.4 || 1 1 || 1 180 — — 330 — — 150 1300 2.1 — 55 5.3 2.5 50 — 160 — — 310 — — 140 1250 2.2 — 51 6.0 2.9 48 ±6 ±14 ±13 –60 ±3 ±10 50 VCM ±0.7 — — VCM ±1.4 55 –45 — — 12 15 10 — VCM ±0.6 200 VCM ±1.8 75 0 30 — — ±40 — — — — — — 150 — — 300 — — 125 950 2.6 — 46 6.1 3.6 47 ±8 ±14 ±20 –90 ±4 ±10 48 VCM ±0.6 — — VCM ±1.3 50 –40 — — 12 16 9 — VCM ±0.6 200 VCM ±1.8 85 0 50 — — ±40 — — — — — — MHz MHz MHz MHz dB MHz MHz V/µs ns ns dB nV/√Hz pA/√Hz dB mV µV/°C µA nA/°C µA nA/°C dB V MΩ || pF MΩ || pF V mA mA Ω V V mA mA dB V mV V µA µA nA/°C MΩ || pF dB mV µA MHz V/µs mV ns mV Min Typ Typ Min Typ Typ Min Min Max Typ Min Max Max Min Max Max Max Max Max Max Min Min Typ Typ Min Min Min Typ Typ Max Max Min Typ Min Min Max Max Min Max Typ Typ Max Typ Typ Typ Typ Typ Typ B C C B B C B B B C B B B A A B A B A B A A C C A A A C C A A A C A B B A A B C C A C C C C C C ±5 — ±12 ±2 — 51 VCM ±0.7 — — VCM ±1.4 60 –50 — — 12 15 11 — VCM ±0.6 200 VCM ±1.8 65 0 — — — Input Referred, VCM ±0.5V VH = VCM + 1.8V, VL = VCM – 1.8V RL ≥ 500Ω G = +4, f < 100kHz VCM ±1.6 70 –60 0.8 5 — 13 13 VS = 4.5V to 5.5V 65 Limiter Pins Open VCM ±0.9 200 — 35 35 — 2 || 1 –60 ±15 5 300 20 55 15 30 VO = 2.5V f = 5MHz VIN = VCM ±0.4V (VO – VH) or (VO – VL) VIN = ±0.4V, VO < 0.02Vp-p VIN = VCM to VCM ±0.4V Step VIN = VCM ±0.4V to VCM Step f = 5MHz, VO = 2Vp-p ±35 — — — — — — ® OPA689 4 SPECIFICATIONS — VS = +5V (cont.) OPA689U, P TYP +25°C –40 to +85 100 125 +25°C — — — GUARANTEED(1) 0°C to +70°C — — — –40°C to +85°C — — — MIN/ TEST MAX LEVEL(2) G = +6, RF = 750Ω, RL = 500Ω tied to VCM = 2.5V, VL = VCM –1.2V, VH = VCM +1.2V, (Figure 2 for AC performance only), unless otherwise noted. PARAMETER THERMAL CHARACTERISTICS Temperature Range Thermal Resistance P 8-Pin DIP U 8-Pin SO-8 CONDITIONS UNITS °C °C/W °C/W Specification: P, U Typ Typ Typ C C C NOTES: (1) Junction Temperature = Ambient Temperature for low temperature limit and 25 °C guaranteed specifications. Junction Temperature = Ambient Temperature + 23°C at high temperature limit guaranteed specifications. (2) TEST LEVELS: (A) 100% tested at 25 °C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation. (C) Typical value for information only. (3) Current is considered positive out of node. (4) CMIR tested as < 3dB degradation from minimum CMRR at specified limits. (5) I VH (VH bias current) is negative, and IVL (VL bias current) is positive, under these conditions. See Note 3 and Figures 2 and 7. (6) Limiter feedthrough is the ratio of the output magnitude to the sinewave added to V H (or VL) when VIN = 0. (7) VH slew rate conditions are: VIN = VCM +0.4V, G = +6, VL = VCM –1.2V, VH = step between VCM +1.2V and VCM. VL slew rate conditions are similar. (8) Linearity Guardband is defined for an output sinusoid (f = 5MHz, VO = VCM ±1Vp-p) centered between the limiter levels (VH and VL). It is the difference between the limiter level and the peak output voltage where SFDR decreases by 3dB (see Figure 8). ABSOLUTE MAXIMUM RATINGS Supply Voltage ................................................................................. ±6.5V Internal Power Dissipation ........................... See Thermal Characteristics Input Voltage Range ............................................................................ ±VS Differential Input Voltage ..................................................................... ±VS Limiter Voltage Range ........................................................... ±(VS – 0.7V) Storage Temperature Range: P, U ................................ –40°C to +125 °C Lead Temperature (DIP, soldering, 10s) ...................................... +300°C (SO-8, soldering, 3s) ...................................... +260°C Junction Temperature .................................................................... +175°C ELECTROSTATIC DISCHARGE SENSITIVITY This integrated circuit can be damaged by ESD. Burr-Brown 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. ABSOLUTE MAXIMUM RATINGS Top View DIP-8, SO-8 NC Inverting Input Non-Inverting Input –VS 1 2 3 4 8 7 6 5 VH +VS Output VL PACKAGE/ORDERING INFORMATION PACKAGE DRAWING NUMBER 006 182 SPECIFIED TEMPERATURE RANGE –40°C to +85°C –40°C to +85°C PACKAGE MARKING OPA689P OPA689U ORDERING NUMBER(1) OPA689P OPA689U OPA689U/2K5 TRANSPORT MEDIA Rails Rails Tape and Reel PRODUCT OPA689P OPA689U PACKAGE DIP-8 SO-8 Surface Mount " " " " " NOTES: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “OPA689U/2K5” will get a single 2500-piece Tape and Reel. ® 5 OPA689 TYPICAL PERFORMANCE CURVES— VS = ±5V G = +6, RL = 500Ω, RF = 750Ω, VH = –VL = 2V, (Figure 1 for AC performance only), unless otherwise noted. NON-INVERTING SMALL-SIGNAL FREQUENCY RESPONSE 9 6 Normalized Gain (dB) INVERTING SMALL-SIGNAL FREQUENCY RESPONSE 6 3 Normalized Gain (dB) VO = 0.5Vp-p G = +4 G = +6 VO = 0.5Vp-p G = –4 3 0 –3 –6 –9 –12 –15 –18 –21 1M 10M 100M Frequency (Hz) 1G G = +20 G = +12 0 –3 –6 –9 –12 –15 –18 –21 –24 1M 10M 100M Frequency (Hz) 1G G = –6 G = –12 SMALL-SIGNAL PULSE RESPONSE 0.5 0.4 0.3 Output Voltage (V) LARGE-SIGNAL PULSE RESPONSE 2.5 2.0 1.5 Output Voltage (V) VO = 0.5Vp-p VO = 2Vp-p 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 –0.5 Time (5ns/div) 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 Time (5ns/div) VH—LIMITED PULSE RESPONSE 2.5 2.0 Input and Output Voltages (V) VL—LIMITED PULSE RESPONSE 2.5 2.0 Input and Output Voltages (V) VO 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 Time (20ns/div) VH = +2V G = +6 VIN 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 Time (20ns/div) VO VIN VL = –2V G = +6 ® OPA689 6 TYPICAL PERFORMANCE CURVES— VS = ±5V G = +6, RL = 500Ω, RF = 750Ω, VH = –VL = 2V, (Figure 1 for AC performance only), unless otherwise noted. (cont.) HARMONIC DISTORTION vs FREQUENCY 2nd and 3rd Harmonic Distortion (dBc) HARMONIC DISTORTION NEAR LIMIT VOLTAGES 2nd and 3rd Harmonic Distortion (dBc) –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 1M Frequency (Hz) 10M 20M HD3 VO = 2Vp-p RL = 500Ω HD2 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 HD3 HD2 VO = 0VDC ±1Vp f1 = 5MHz RL = 500Ω ± Limit Voltage (V) 2ND HARMONIC DISTORTION vs OUTPUT SWING –40 2nd Harmonic Distortion (dBc) 3RD HARMONIC DISTORTION vs OUTPUT SWING –40 3rd Harmonic Distortion (dBc) –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 0.1 RL = 500Ω f1 = 20MHz f1 = 10MHz –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 RL = 500Ω f1 = 20MHz f1 = 10MHz f1 = 5MHz f1 = 2MHz f1 = 1MHz f1 = 5MHz f1 = 2MHz f1 = 1MHz 1.0 Output Swing (Vp-p) 5.0 0.1 1.0 Output Swing (Vp-p) 5.0 HARMONIC DISTORTION vs LOAD RESISTANCE 2nd and 3rd Harmonic Distortion (dBc) –40 –45 –50 –55 HD2 VO = 2Vp-p f1 = 5MHz 21.6 18.6 15.6 12.6 LARGE SIGNAL FREQUENCY RESPONSE G = +6 2Vp-p ≤ 0.5Vp-p Gain (dB) –60 –65 –70 –75 –80 –85 –90 50 100 Load Resistance (Ω) 1000 HD3 9.6 6.6 3.6 0.6 –2.4 –5.4 –8.4 0.1 10M 100M Frequency (Hz) 1G ® 7 OPA689 TYPICAL PERFORMANCE CURVES— VS = ±5V G = +6, RL = 500Ω, RF = 750Ω, VH = –VL = 2V, (Figure 1 for AC performance only), unless otherwise noted. (cont.) RS vs CAPACITIVE LOAD 50 45 Gain to Capacitive Load (dB) FREQUENCY RESPONSE vs CAPACITIVE LOAD 21.6 18.6 15.6 12.6 9.6 6.6 3.6 0.6 –2.4 150Ω VIN 125Ω RS VO = 0.5Vp-p CL = 0 CL = 100pF CL = 1000pF CL = 10pF 40 35 RS ( Ω ) 30 25 20 15 10 5 0 1 10 100 1000 Capacitive Load (pF) OPA689 750Ω 1kΩ VO CL –5.4 –8.4 0.1 1kΩ is optional 10M 100M Frequency (Hz) 1G OPEN-LOOP FREQUENCY RESPONSE Input Voltage Noise Density (nV/√Hz) Input Current Noise Density (pA/√Hz) INPUT NOISE DENSITY 60 50 Gain Open-Loop Gain (dB) 0 –30 –60 Phase –90 VO = 0.5Vp-p –120 –150 –180 –210 –240 1G Open-Loop Phase (deg) 100 40 30 20 10 0 –10 –20 10k 100k 1M 10M 100M Frequency (Hz) Voltage Noise 10 4.6nV/√Hz Current Noise 2.0pA/√Hz 1 100 1k 10k 100k 1M 10M Frequency (Hz) LIMITER SMALL-SIGNAL FREQUENCY RESPONSE 6 3 0 VO = 0.02Vp-p LIMITER FEEDTHROUGH –30 –35 –40 Feedthrough (dB) Limiter Gain (dB) –3 –6 –9 –12 –15 –18 –21 –24 1M 10M 100M Frequency (Hz) 1G 150Ω 750Ω 125Ω 0.7VDC 8 VO VH = 0.02Vp-p + 2.0VDC –45 –50 –55 –60 –65 –70 –75 –80 1M 10M Frequency (Hz) 50M 150Ω 750Ω 125Ω 8 VO VH = 0.02Vp-p + 2VDC ® OPA689 8 TYPICAL PERFORMANCE CURVES— VS = ±5V G = +6, RL = 500Ω, RF = 750Ω, VH = –VL = 2V, (Figure 1 for AC performance only), unless otherwise noted. (cont.) CLOSED-LOOP OUTPUT IMPEDANCE 100 Limter Input Bias Current (µA) 100 LIMITER INPUT BIAS CURRENT vs BIAS VOLTAGE Maximum Over Temperature 75 50 25 Minimum Over Temperature 0 –25 –50 –75 Limiter Headroom = +VS – VH = VL – (–VS) Current = IVH or –IVL G = +4 VO = 0.5Vp-p Output Impedance (Ω) 10 1 0.1 100k 1M 10M Frequency (Hz) 100M 1G –100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Limiter Headroom (V) SUPPLY AND OUTPUT CURRENTS vs TEMPERATURE 20 200 100 PSR AND CMR vs TEMPERATURE PSR and CMR, Input Referred (dB) 95 90 85 80 75 70 65 60 55 50 –50 –25 0 25 50 75 100 Ambient Temperature (°C) CMRR PSR+ PSRR PSR– 18 Supply Current (mA) 16 Supply Current 160 14 | Output Current, Sinking | 12 140 120 10 –50 –25 0 25 50 75 Ambient Temperature (°C) 100 100 VOLTAGE RANGES vs TEMPERATURE 5.0 VH = –VL = 4.3V ± Voltage Range (V) 4.5 Output Voltage Range 4.0 3.5 Common-Mode Input Range 3.0 –50 –25 0 25 50 75 100 Ambient Temperature (°C) Output Current (mA) Output Current, Sourcing 180 ® 9 OPA689 TYPICAL PERFORMANCE CURVES— VS = +5V G = +6, RF = 402Ω, RL = 500Ω tied to VCM = 2.5V, VL = VCM –1.2V, VH = VCM +1.2V, (Figure 2 for AC performance only), unless otherwise noted. NON-INVERTING SMALL-SIGNAL FREQUENCY RESPONSE 9 6 Normalized Gain (dB) INVERTING SMALL-SIGNAL FREQUENCY RESPONSE 6 3 Normalized Gain (dB) VO = 0.5Vp-p VO = 0.5Vp-p G = –4 3 0 –3 –6 –9 –12 –15 –18 –21 1M 10M 100M Frequency (Hz) 1G G = +20 G = +12 G = +6 G = +4 0 –3 –6 –9 –12 –15 –18 –21 –24 1M 10M 100M Frequency (Hz) 1G G = –12 G = –6 LARGE-SIGNAL FREQUENCY RESPONSE 21.6 18.6 15.6 12.6 ≤ 0.5Vp-p VH AND VH—LIMITED PULSE RESPONSE 5.0 4.5 Input and Output Voltages (V) VH = VCM +1.2V VL = VCM –1.2V VO 2Vp-p 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 VCM = 2.5V Gain (dB) 9.6 6.6 3.6 0.6 –2.4 –5.4 –8.4 0.1 10M 100M Frequency (Hz) 1G VIN VIN VO Time (20ns/div) HARMONIC DISTORTION vs FREQUENCY 2nd and 3rd Harmonic Distortion (dBc) 2nd and 3rd Harmonic Distortion (dBc) HARMONIC DISTORTION NEAR LIMIT VOLTAGES –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 HD3 HD2 VO = 2.5VDC ±1Vp f1 = 5MHz RL = 500Ω –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 1M Frequency (Hz) 10M 20M HD3 VO = 2Vp-p RL = 500Ω HD2 | Limit Voltages – 2.5VDC | ® OPA689 10 TYPICAL APPLICATIONS DUAL SUPPLY, NON-INVERTING AMPLIFIER Figure 1 shows a non-inverting gain amplifier for dual supply operation. This circuit was used for AC characterization of the OPA689, with a 50Ω source, which it matches, and a 500Ω load. The power supply bypass capacitors are shown explicitly in Figures 1 and 2, but will be assumed in the other figures. The limiter voltages (VH and VL) and their bias currents (IVH and IVL) have the polarities shown. SINGLE SUPPLY, NON-INVERTING AMPLIFIER Figure 2 shows an AC coupled, non-inverting gain amplifier for single supply operation. This circuit was used for AC 3.01kΩ +VS = +5V + 2.2µF 0.1µF 1.91kΩ characterization of the OPA689, with a 50Ω source, which it matches, and a 500Ω load. The power supply bypass capacitors are shown explicitly in Figures 1 and 2, but will be assumed in the other figures. The limiter voltages (VH and VL ) and their bias currents (IVH and IVL ) have the polarities shown. Notice that the single supply circuit can use 3 resistors to set VH and VL, where the dual supply circuit usually uses 4 to reference the limit voltages to ground. LOW DISTORTION, ADC INPUT DRIVER The circuit in Figure 3 shows an inverting, low distortion ADC driver that operates on single supply. The converter’s internal references bias the op amp input. The 4.0pF and 18pF capacitors form a compensation network that allows VS = +5V 0.1µF VH = +2V + 2.2µF 0.1µF 0.1µF 523Ω VH = 3.7V 7 8 53.6Ω 1.50kΩ 2 4 IVH 6 976Ω 0.1µF VO 500Ω 100Ω VIN 49.9Ω 3 7 8 IVH 6 500Ω VO 0.1µF VIN 1.50kΩ 3 OPA689 2 5 4 RG 150Ω RF 750Ω IVL OPA689 5 IVL 0.1µF 0.1µF VL = –2V RF 750Ω 0.1µF RG 150Ω VL = 1.3V 523Ω + –VS = –5V 2.2µF 3.01kΩ 1.91kΩ 0.1µF FIGURE 1. DC-Coupled, Dual Supply Amplifier. FIGURE 2. AC-Coupled, Single Supply Amplifier. VS = +5V 787Ω VH = +3.6V 4.0pF 0.1µF VIN 18pF 2 VS = +5V 7 8 OPA689 3 4 0.1µF 5 6 24.9Ω 374Ω 750Ω 0.1µF 100Ω +3.5V REFT RSEL VS = +5V +VS IN 100pF REFB ADS822 10-Bit 40MSPS 10-Bit Data INT/EXT GND 1.40kΩ 1.40kΩ +2.5V VL = +1.4V +1.5V 100Ω 0.1µF 787Ω FIGURE 3. Low Distortion, Limiting ADC Input Driver. ® 11 OPA689 the OPA689 to have a flat frequency response at a gain of – 2. This increases the loop gain of the op amp feedback network, which reduces the distortion products below their specified values. λ PRECISION HALF WAVE RECTIFIER Figure 4 shows a half wave rectifier with outstanding precision and speed. VH will default to a voltage between 3.1 and 3.8V if left open, while the negative limit is set to ground. ID CD 5.0pF 3 –VB CF 1.0pF 4.32kΩ VO +VS = +5V 7 OPA689 2 4 5 NC NC 8 6 +VS = +5V 0.1µF 4.32kΩ –VS = –5V 124Ω VIN 2 7 NC 8 FIGURE 6. Transimpedance Amplifier. 6 VO OPA689 3 4 150Ω 750Ω 5 DESIGN-IN TOOLS APPLICATIONS SUPPORT The Burr-Brown Applications Department is available for design assistance at phone number 1-800-548-6132 (US/Canada only). The Burr-Brown Internet web page (http://www.burr-brown.com) has the latest data sheets and other design aids. DEMONSTRATION BOARDS Two PC boards are available to assist in the initial evaluation of circuit performance of the OPA689 in both package styles. These will be available as an unpopulated PCB with descriptive documentation. See the board literature for more information. The summary information for these boards is shown below: BOARD PART NUMBER DEM-OPA68xP DEM-OPA68xU LITERATURE REQUEST NUMBER MKT-350 MKT-351 –VS = –5V FIGURE 4. Precision Half Wave Rectifier. VERY HIGH SPEED COMPARATOR Figure 5 shows a very high speed comparator with hysterisis. The output level are precisely defined, and the recovery time is exceptional. The output voltage swings between 0.5V and 3.5V to provide a logic level output that switches as VIN crosses VREF. +VS = +5V 100Ω 2.00kΩ 604Ω VO 3 7 8 95.3Ω VIN 6 1.21kΩ 0.1µF PRODUCT OPA689P OPA689U PACKAGE 8-Pin DIP 8-Pin SO-8 OPA689 2 4 5 0.1µF Contact the Burr-Brown Applications Department for availability of these boards. SPICE MODELS Computer simulation of circuit performance using SPICE is often useful when analyzing analog circuit or system performance. This is particularly true for high speed amplifier circuits where parasitic capacitance and inductance can have a major effect on frequency response. SPICE models are available through the Burr-Brown web site (www.burr-brown.com). These models do a good job of predicting small-signal AC and transient performance under a wide variety of operating conditions. They do not do as well in predicting the harmonic distortion, temperature effects, or different gain and phase characteristics. These models do not distinquish between the AC performance of different package types. 12 200kΩ –VS = –5V FIGURE 5. Very High Speed Comparator. TRANSIMPEDANCE AMPLIFIER Figure 6 shows a transimpedance amplifier that has exceptional overdrive characteristics. The feedback capacitor (CF) stabilizes the circuit for the assumed diode capacitance (CD). ® OPA689 OPERATING INFORMATION THEORY OF OPERATION The OPA689 is a voltage feedback op amp that is stable for gains ≥ +4. The output voltage is limited to a range set by the limiter pins (5 and 8). When the input tries to overdrive the output, the limiters take control of the output buffer. This avoids saturating any parts in the signal path, gives quick overdrive recovery, and gives consistent limiter accuracy for any gain. This part is de-compensated (stable for gains ≥ +4). This gives greater bandwidth, higher slew rate, and lower noise than the unity gain stable companion part OPA688. The limiters have a very sharp transition from the linear region of operation to output limiting. This allows the limiter voltages to be set very near (