AD847AQ

a High Speed, Low Power Monolithic Op Amp AD847 FEATURES Superior Performance High Unity Gain BW: 50 MHz Low Supply Current: 5.3 mA High Slew Rate: 300 V/ms Excellent Video Specifications 0.04% Differential Gain (NTSC and PAL) 0.198 Differential Phase (NTSC and PAL) Drives Any Capacitive Load Fast Settling Time to 0.1% (10 V Step): 65 ns Excellent DC Performance High Open-Loop Gain 5.5 V/mV (RLOAD = 1 kV) Low Input Offset Voltage: 0.5 mV Specified for 65 V and 615 V Operation Available in a Wide Variety of Options Plastic DIP and SOIC Packages Cerdip Package Die Form MIL-STD-883B Processing Tape & Reel (EIA-481A Standard) Dual Version Available: AD827 (8 Lead) Enhanced Replacement for LM6361 Replacement for HA2544, HA2520/2/5 and EL2020 APPLICATIONS Video Instrumentation Imaging Equipment Copiers, Fax, Scanners, Cameras High Speed Cable Driver High Speed DAC and Flash ADC Buffers CONNECTION DIAGRAM Plastic DIP (N), Small Outline (R) and Cerdip (Q) Packages specifications which include an open-loop gain of 3500 V/V (500 Ω load) and low input offset voltage of 0.5 mV. Commonmode rejection is a minimum of 78 dB. Output voltage swing is ± 3 V into loads as low as 150 Ω. Analog Devices also offers over 30 other high speed amplifiers from the low noise AD829 (1.7 nV/√Hz) to the ultimate video amplifier, the AD811, which features 0.01% differential gain and 0.01° differential phase. APPLICATION HIGHLIGHTS 1. As a buffer the AD847 offers a full-power bandwidth of 12.7 MHz (5 V p-p with ± 5 V supplies) making it outstanding as an input buffer for flash A/D converters. PRODUCT DESCRIPTION The AD847 represents a breakthrough in high speed amplifiers offering superior ac & dc performance and low power, all at low cost. The excellent dc performance is demonstrated by its ± 5 V 2. The low power and small outline package of the AD847 make it very well suited for high density applications such as multiple pole active filters. 3. The AD847 is internally compensated for unity gain operation and remains stable when driving any capacitive load. QUIESCENT CURRENT – mA 6 5.5 5 4.5 4 0 5 10 15 SUPPLY VOLTAGE – ± Volts 20 Quiescent Current vs. Supply Voltage AD847 Driving Capacitive Loads Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 REV. F AD847–SPECIFICATIONS (@ T = +258C, unless otherwise noted) A Model Conditions INPUT OFFSET VOLTAGE1 VS ±5 V Min AD847J Typ 0.5 TMIN to TMAX Offset Drift Min 15 INPUT BIAS CURRENT INPUT OFFSET CURRENT 6.6 7.2 3.3 6.6 10 µA µA ± 5 V, ± 15 V 50 300 400 50 300 500 nA nA nA/°C Offset Current Drift 0.3 VOUT = ± 2.5 V RLOAD = 500 Ω TMIN to TMAX RLOAD = 150 Ω VOUT = ± 10 V RLOAD = 1 kΩ TMIN to TMAX DYNAMIC PERFORMANCE Unity Gain Bandwidth 2 Slew Rate3 Settling Time to 0.1%, RLOAD = 250 Ω VOUT = 5 V p-p RLOAD = 500 Ω, VOUT = 20 V p-p, RLOAD = 1 kΩ RLOAD = 1 kΩ Units mV mV µV/°C 3.3 TMIN to TMAX OPEN-LOOP GAIN AD847AR Typ Max 0.5 1 4 15 ± 5 V, ± 15 V TMIN to TMAX Full Power Bandwidth Max 1 3.5 0.3 ±5 V 2 1 3.5 2 1 1.6 ± 15 V 3 1.5 3.5 V/mV V/mV V/mV 1.6 5.5 3 1.5 5.5 V/mV V/mV ±5 V ± 15 V 35 50 35 50 MHz MHz ±5 V 12.7 12.7 MHz ± 15 V ±5 V ± 15 V 4.7 200 300 4.7 200 300 MHz V/µs V/µs 225 225 –2.5 V to +2.5 V 10 V Step, AV = –1 –2.5 V to +2.5 V 10 V Step, AV = –1 CLOAD = 10 pF RLOAD= 1 kΩ f ≈ 4.4 MHz, RLOAD = 1 kΩ f ≈ 4.4 MHz, RLOAD = 1 kΩ ±5 V ± 15 V ±5 V ± 15 V ± 15 V 65 65 140 120 65 65 140 120 ns ns ns ns ± 15 V ± 15 V 50 0.04 0.19 50 0.04 0.19 Degree % Degree COMMON-MODE REJECTION VCM = ± 2.5 V VCM = ± 12 V TMIN to TMAX ±5 V ± 15 V POWER SUPPLY REJECTION VS = ± 5 V to ± 15 V TMIN to TMAX INPUT VOLTAGE NOISE f = 10 kHz ± 15 V INPUT CURRENT NOISE f = 10 kHz to 0.01%, RLOAD = 250 Ω Phase Margin Differential Gain Differential Phase INPUT COMMON-MODE VOLTAGE RANGE 78 78 75 95 95 78 78 75 95 95 dB dB dB 75 72 86 75 72 86 dB dB 15 15 nV/√Hz ± 15 V 1.5 1.5 pA/√Hz ±5 V +4.3 –3.4 +14.3 –13.4 +4.3 –3.4 +14.3 –13.4 V V V V 3.6 3 ± 15 V 32 32 ±V ±V ±V ±V mA INPUT RESISTANCE 300 300 kΩ INPUT CAPACITANCE 1.5 1.5 pF 15 15 Ω OUTPUT VOLTAGE SWING RLOAD = 500 Ω RLOAD = 150 Ω RLOAD = 1 kΩ RLOAD = 500 Ω Short-Circuit Current OUTPUT RESISTANCE ±5 V ±5 V ± 15 V ± 15 V ± 15 V 3.0 2.5 12 10 Open Loop POWER SUPPLY Operating Range Quiescent Current ±5 V TMIN to TMAX 3.6 3 64.5 ± 15 V TMIN to TMAX 4.8 5.3 3.0 2.5 12 10 618 6.0 7.3 6.3 7.6 64.5 4.8 5.3 618 6.0 7.3 6.3 7.6 V mA mA mA mA NOTES l Input Offset Voltage Specifications are guaranteed after 5 minutes at T A = +25°C. Full Power Bandwidth = Slew Rate/2 π VPEAK. 3 Slew Rate is measured on rising edge. All min and max specifications are guaranteed. Specifications in boldface are 100% tested at final electrical test. Specifications subject to change without notice. 2 –2– REV. F AD847 Model Conditions INPUT OFFSET VOLTAGE1 VS ±5 V Min TMIN to TMAX Offset Drift INPUT BIAS CURRENT AD847AQ Typ Max 0.5 1 4 15 Full Power Bandwidth2 Slew Rate3 Settling Time to 0.1%, RLOAD = 250 Ω to 0.01%, RLOAD = 250 Ω Phase Margin Differential Gain Differential Phase 15 3.3 5 7.5 µA µA ± 5 V, ± 15 V 50 300 400 50 300 400 nA nA nA/°C 0.3 DYNAMIC PERFORMANCE Unity Gain Bandwidth VOUT = 5 V p-p RLOAD = 500 Ω, VOUT = 20 V p-p, RLOAD = 1 kΩ RLOAD = 1 kΩ –2.5 V to +2.5 V 10 V Step, AV = –1 –2.5 V to +2.5 V 10 V Step, AV = –1 CLOAD = 10 pF RLOAD= 1 kΩ f ≈ 4.4 MHz, RLOAD = 1 kΩ f ≈ 4.4 MHz, RLOAD = 1 kΩ COMMON-MODE REJECTION VCM = ± 2.5 V VCM = ± 12 V TMIN to TMAX POWER SUPPLY REJECTION VS = ± 5 V to ± 15 V TMIN to TMAX Units mV mV µV/°C 5 7.5 Offset Current Drift VOUT = ± 2.5 V RLOAD = 500 Ω TMIN to TMAX RLOAD = 150 Ω VOUT = = ± 10 V RLOAD = 1 kΩ TMIN to TMAX Max 1 4 3.3 TMIN to TMAX OPEN-LOOP GAIN AD847S Typ 0.5 ± 5 V, ± 15 V TMIN to TMAX INPUT OFFSET CURRENT Min 0.3 ±5 V 2 1 3.5 2 1 1.6 ± 15 V 3 1.5 3.5 V/mV V/mV V/mV 1.6 5.5 3 1.5 5.5 V/mV V/mV ±5 V ± 15 V 35 50 35 50 MHz MHz ±5 V 12.7 12.7 MHz ± 15 V ±5 V ± 15 V 4.7 200 300 4.7 200 300 MHz V/µs V/µs 225 225 ±5 V ± 15 V ±5 V ± 15 V ± 15 V 65 65 140 120 65 65 140 120 ns ns ns ns ± 15 V ± 15 V 50 0.04 0.19 50 0.04 0.19 Degree % Degree ±5 V ± 15 V 80 80 75 95 95 80 80 75 95 95 dB dB dB 75 72 86 75 72 86 dB dB INPUT VOLTAGE NOISE f = 10 kHz ± 15 V 15 15 nV/√Hz INPUT CURRENT NOISE f = 10 kHz ± 15 V 1.5 1.5 pA/√Hz ±5 V +4.3 –3.4 +14.3 –13.4 +4.3 –3.4 +14.3 –13.4 V V V V 3.6 3 INPUT COMMON-MODE VOLTAGE RANGE ± 15 V OUTPUT VOLTAGE SWING RLOAD = 500 Ω RLOAD = 150 Ω RLOAD = 1 kΩ RLOAD = 500 Ω Short-Circuit Current ±5 V ±5 V ± 15 V ± 15 V ± 15 V 3.0 2.5 12 10 INPUT RESISTANCE INPUT CAPACITANCE OUTPUT RESISTANCE Open Loop POWER SUPPLY Operating Range Quiescent Current ±5 V TMIN to TMAX ± 15 V TMIN to TMAX REV. F –3– 32 32 ±V ±V ±V ±V mA 300 300 kΩ 3.6 3 3.0 2.5 12 10 1.5 1.5 pF 15 15 Ω 64.5 4.8 5.3 618 5.7 7.0 6.3 7.6 64.5 4.8 5.3 618 5.7 7.8 6.3 8.4 V mA mA mA mA AD847 ABSOLUTE MAXIMUM RATINGS 1 ESD SUSCEPTIBILITY Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V Internal Power Dissipation2 Plastic (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Watts Small Outline (R) . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 Watts Cerdip (Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Watts Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . ± 6 V Storage Temperature Range (Q) . . . . . . . . . –65°C to +150°C (N, R) . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +125°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 175°C Lead Temperature Range (Soldering 60 sec) . . . . . . . +300°C ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 volts, which readily accumulate on the human body and on test equipment, can discharge without detection. Although the AD847 features proprietary ESD protection circuitry, permanent damage may still occur on these devices if they are subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid any performance degradation or loss of functionality. NOTES 1 Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 Mini-DIP Package: θJA = 100°C/Watt; θJC = 33°C/Watt Cerdip Package: θJA = 110°C/Watt; θJC = 30°C/Watt Small Outline Package: θJA = 155°C/Watt; θJC = 33°C/Watt METALIZATION PHOTOGRAPH Contact factory for latest dimensions. Dimensions shown in inches and (mm). ORDERING GUIDE Models* Temperature Range – 8C Package Description Package Option AD847JN AD847JR AD847AQ AD847AR AD847SQ AD847SQ/883B 5962-8964701PA 0 to +70 0 to +70 –40 to +85 –40 to +85 –55 to +125 –55 to +125 –55 to +125 Plastic SOIC Cerdip SOIC Cerdip Cerdip Cerdip N-8 R-8 Q-8 R-8 Q-8 Q-8 Q-8 *AD847 also available in J and S grade chips, and AD847JR and AD847AR are available *in tape and reel. –4– REV. F AD847 Typical Characteristics (@ +258C and V = 615 V, unless otherwise noted) S 20 OUTPUT VOLTAGE SWING – Volts INPUT COMMON-MODE RANGE – ± Volts 20 15 +VIN 10 –VIN 5 15 +VOUT 10 –VOUT 5 R LOAD = 500Ω 0 0 0 5 15 10 0 20 5 SUPPLY VOLTAGE – ± Volts Figure 1. Input Common-Mode Range vs. Supply Voltage 20 Figure 2. Output Voltage Swing vs. Supply Voltage 30 OUTPUT VOLTAGE SWING – Volts p-p 15 10 SUPPLY VOLTAGE – ± Volts 6 QUIESCENT CURRENT – mA 25 20 ±15 V SUPPLIES 15 10 ±5V SUPPLIES 5 0 5.5 5 4.5 4 10 100 1k 10k 0 LOAD RESISTANCE – Ω 100 OUTPUT IMPEDANCE – Ω INPUT BIAS CURRENT – µA 20 Figure 4. Quiescent Current vs. Supply Voltage 5 4 VS = ± 5V 3 10 1 0.1 0.01 –40 –20 0 20 40 60 80 100 120 140 10k TEMPERATURE – °C 100k 1M 10M 100M FREQUENCY – Hz Figure 6. Output Impedance vs. Frequency Figure 5. Input Bias Current vs. Temperature REV. F 15 10 SUPPLY VOLTAGE – ± Volts Figure 3. Output Voltage Swing vs. Load Resistance 2 –60 5 –5– AD847–Typical Characteristics (@ +258C and V = 615 V, unless otherwise noted) S 35 SHORT CIRCUIT CURRENT LIMIT – mA 6 5 4 VS = ± 5V 3 –60 –40 –20 0 20 40 60 80 100 120 30 25 20 15 –60 140 –40 –20 TEMPERATURE – °C 100 140 +100° 80 +80° ±15V SUPPLIES 1kΩ LOAD 51 OPEN -LOOP GAIN – dB UNITY – GAIN BANDWIDTH – MHz 52 50 49 60 +60° ±5V SUPPLIES 500Ω LOAD 40 +40° 20 +20° 0 48 –60 120 Figure 8. Short-Circuit Current Limit vs. Temperature Figure 7. Quiescent Current vs. Temperature 0 –20 –40 –20 0 20 40 60 80 100 120 100 140 1k 10k 100k 1M FREQUENCY – Hz TEMPERATURE – °C Figure 9. Gain Bandwidth Product vs. Temperature 10M 100M Figure 10. Open-Loop Gain and Phase Margin vs. Frequency 80 100 POWER SUPPLY REJECTION – dB VS = ±15V 75 OPEN-LOOP GAIN – dB 0 20 40 60 80 100 AMBIENT TEMPERATURE – °C PHASE MARGIN – DEGREES QUIESCENT CURRENT – mA 7 70 VS = ± 5V 65 60 55 50 10 100 1k +SUPPLY 80 60 –SUPPLY 40 20 0 10k 1k LOAD RESISTANCE – Ω Figure 11. Open-Loop Gain vs. Load Resistance 10k 100k 1M FREQUENCY – Hz 10M 100M Figure 12. Power Supply Rejection vs. Frequency –6– REV. F AD847 100 80 OUTPUT VOLTAGE – Volts p–p 30 VCM = ±1V p-p CMR – dB 60 40 20 25 20 RL = 1kΩ 15 10 5 0 0 1k 10k 100k 1M 10M 1M 100M 10M 100M INPUT FREQUENCY – Hz FREQUENCY – Hz Figure 14. Large Signal Frequency Response Figure 13. Common-Mode Rejection vs. Frequency –70 10 HARMONIC DISTORTION – dB OUTPUT SWING FROM 0 TO ± V 8 6 4 2 1% 0.1% 1% 0.1% 0 –2 –4 –6 –80 3V RMS R L=1kΩ –90 2ND HARMONIC –100 –110 3RD HARMONIC –120 –8 –130 100 –10 0 20 40 60 80 100 120 140 160 1k SETTLING TIME – ns Figure 15. Output Swing and Error vs. Settling Time 450 400 40 SLEW RATE – V/µs Hz INPUT VOLTAGE NOISE – nV/ 100k Figure 16. Harmonic Distortion vs. Frequency 50 30 20 10 350 300 250 200 150 –60 0 10 100 1k 10k 100k 1M 10M –40 –20 0 20 40 60 80 100 120 TEMPERATURE – °C FREQUENCY – Hz Figure 18. Slew Rate vs. Temperature Figure 17. Input Voltage Noise Spectral Density REV. F 10k FREQUENCY – Hz –7– 140 AD847 Figure 19. Inverting Amplifier Configuration Figure 19a. Inverter Large Signal Pulse Response Figure 19b. Inverter Small Signal Pulse Response Figure 20. Noninverting Amplifier Configuration Figure 20a. Noninverting Large Signal Pulse Response Figure 20b. Noninverting Small Signal Pulse Response –8– REV. F AD847 OFFSET NULLING +VS The input offset voltage of the AD847 is very low for a high speed op amp, but if additional nulling is required, the circuit shown in Figure 21 can be used. CF OUTPUT –IN +IN –VS Figure 21. Offset Nulling NULL 1 NULL 8 INPUT CONSIDERATIONS An input resistor (RIN in Figure 20) is required in circuits where the input to the AD847 will be subjected to transient or continuous overload voltages exceeding the ± 6 V maximum differential limit. This resistor provides protection for the input transistors by limiting the maximum current that can be forced into their bases. Figure 22. AD847 Simplified Schematic GROUNDING AND BYPASSING In designing practical circuits with the AD847, the user must remember that whenever high frequencies are involved, some special precautions are in order. Circuits must be built with short interconnect leads. A large ground plane should be used whenever possible to provide a low resistance, low inductance circuit path, as well as minimizing the effects of high frequency coupling. Sockets should be avoided because the increased interlead capacitance can degrade bandwidth. For high performance circuits it is recommended that a resistor (RB in Figures 19 and 20) be used to reduce bias current errors by matching the impedance at each input. The offset voltage error will be reduced by more than an order of magnitude. THEORY OF OPERATION Feedback resistors should be of low enough value to assure that the time constant formed with the capacitance at the amplifier summing junction will not limit the amplifier performance. Resistor values of less than 5 kΩ are recommended. If a larger resistor must be used, a small (