Model 995FET-Ticha High Performance Discrete Operational Amplifier

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Moel 995FETTicha Moel 995FETTicha High Performance The 995FETTicha is a high performance iscrete operational amplifier esigne for professional auio applications an areas where ultralow noise an

1 Moel 995FETTicha Moel 995FETTicha High Performance The 995FETTicha is a high performance iscrete operational amplifier esigne for professional auio applications an areas where ultralow noise an extremely low istortion is require. A matche FET input stage is incorporate to provie superior soun quality an spee for exceptional auio performance. This in combination with high current output rive capability an excellent c performance allows use in a wie variety of emaning applications. In aition, the 995FETs wie output swing, allows increase hearoom making it ieal for use in any auio circuit. The 995FETTicha can be operate from ±10V to ±24V power supplies. Input cascoe circuitry provies excellent commonmoe rejection an maintains low input bias current over its wie input voltage range, minimizing istortion. The 995FET iscrete op amp is unitygain stable an provies excellent ynamic behavior over a wie range of loa conitions. Features: Ultra Low Total Harmonic Distortion, 048 1k Ultra Low Noise, 1.1nV/rt High Current Output Drive (250mA) 26.5u Output Levels (into 600 ohms) Stanar Gain lock Footprint Operates over ±10V to ±24V supply rails Lower output offset voltage than existing counterparts Lower input leakage current than existing counterparts Class A Output Drive Particular emphasis on auio performance Designe, assemble an prouce in the USA 3 Year Warranty Applications: High Input Impeance Line Amplifiers an Drivers High Input Impeance uffer Active Filters an Equalizers Summing/Mixer Amplifiers High Performance High Input Impeance Microphone Preamplifiers High Performance A/D front en preamplifier High Performance D/A backen river Package Diagram: PC TOP VIEW (14.30mm) LC (2.54mm) LC (2.54mm) (14.30mm) () () ()VEE GND ()VCC (5.08mm) LC (5.08mm) (10.16mm) The alliscrete SMT esign uses an ultraprecision ifferential matche FET pair specifically esigne to meet the requirements of ultralow noise an ultralow THD auio systems (15.24mm) (14.30mm) (10.16mm) LC LC (10.16mm) (14.30mm) SIDE VIEW In aition to the enhance input stage, the 995FETTicha uses high precision temperature stable power supply inepenent current sources. Supply inepenent current sources allow the bias to remain locke at the optimum operating point regarless of power supply voltage. Connection Diagram: 0.280/0.30 (7.10/7.62mm) LC Dia (1.016mm Dia) Dual matche pair temperature stable current mirrors, ual matche pair active current loas give the Moel 995FETTicha it s outstaning power supply rejection performance. The enhance low istortion ClassA output river stage can sink or source 250mA allowing this moule to rive transformers easily. PUT ()VEE GND ()VCC Page P:(510) F:(510)

2 Moel 995FETTicha Moel 995FETTicha High Performance Integrate power transistor heatsinks couple to a anoize aluminum enclosure keeps the 995FETTicha operating within a wie SOA (safe operating area) an oes not suffer from eta roop when riving transformers or low impeance loas. Each amplifier is fully teste an meets or excees publishe specifications (22.99mm) Pin Socket installe from top sie of PC in Diameter hole pa SIDE VIEW Height Above PC oar with STD Pin length an Pin Socket mounte on top sie of PC PC Reference Plane (7.75mm) ecause of the 995FETTicha high current rive capability, supporting circuitry impeances can be scale own within the application circuit. This can reuce the overall system noise, without increase istortion an provies higher hearoom compliance performance. The 995FETTicha iscrete opamp was esigne as an enhance upgrae replacement for the Millennia Meia Series MM99, MM990, Forssell Technologies JFET993, JFET992, or similar FET base opamp gain blocks. The pinouts conform to the 990/2520 package type, allowing irect replacement. If the user is upgraing or replacing vintage or retroclone gear, take note of the pin length require for your particular application. Oler gear typically use moules with to inch long pins. offers this longer pin length variant at no aitional charge. See the Moel 990EnhTicha an 995FET Ticha Mechanical Options Application Note AN18 for aitional mechanical etails. For a JT base iscrete opamp version with this architecture, see the Moel 990EnhTicha atasheet. Sonic Imagery Labs also can provie a variation of this moel that can operate own to ±4.5V for low power, low voltage applications. Contact us an ask about the Moel 995LVEnhTicha (19.59mm) Pin Socket installe from top sie of PC in Diameter hole pa SIDE VIEW Height Above PC oar with STD Pin length an Pin Socket mounte from bottom sie of PC (4.267mm) PC Reference Plane DETAIL A. (Above) Stanar pin length height specifications an mounting options for Moel 990EnhTicha opamp moule. Recommene Operating Conitions: Positive Supply Voltage VCC 10V to 24V Negative Supply Voltage VEE 10V to 24V Signal Current (inverting moe) Iin 1nA to >500 ua Stresses above those liste uner Absolute Maximum Ratings may cause permanent amage to the evice. These are stress ratings only; the functional operation of the evice at these or any other conitions above those inicate in the operational sections is not implie. Exposure to absolute maximum rating conitions for extene perios may affect evice reliability Page 2 P:(510) F:(510)

3 Moel 995FETTicha Moel 995FETTicha High Performance Absolute Maximum Ratings Supply Voltage VCCVEE 52.5V Differential Input Voltage V ID 4.5Vrms unity gain Input Voltage Range V IC ±12.5V Power Dissipation Max P D 7.5W Max Operating Temperature Range T OPR 40~85 C Storage Temperature Range T STG 60~150 C DC Electrical Characteristics (Ta=25 C, Vs=±24V unless otherwise note) Symbol Parameter Conitions Min Typ Max Units V OS I OS I A VOL V OM V OM V CM CMRR PSRR I Q Input Offset Voltage Input Offset Current Input ias Current Voltage Gain (ac open loop) Output Voltage Swing Output Voltage Swing Input CommonMoe Range CommonMoe Rejection Ratio Power Supply Rejection Ratio Supply Current R S =0Ω (shorte) 3@28 Vs=±24V =600Ω Av=10 Vs=±24V =75Ω Av=10 =600Ω Vo=0, inputs gn, Vcc=24V Vo=0, inputs gn, Vee=24V ± ± mv pa pa Vpp Vpp V ma ma AC Electrical Characteristics (Ta=25 C, Vs=±24V unless otherwise note) Symbol Parameter Conitions Min Typ Max Units SR SR GW Slew Rate Slew Rate Gain anwith Prouct Maximum Peak Output Drive Current =600Ω =75Ω 10k to 100k =75Ω V/uS V/uS M ma Design Electrical Characteristics (Ta=25 C, Vs=±24V unless otherwise note) Symbol Parameter Conitions Min Typ Max Units THD THD THD e n i n PW f U Zin Zin Cin DistortionNoise (Inverting Unity) DistortionNoise (NonInverting 6) DistortionNoise (NonInverting 20) Input Refere Noise Voltage Input Refere Noise Current Power anwith Unity Gain Frequency Input Resistance Input Resistance Input Capacitance =600Ω 1Vrms =600Ω 1Vrms =600Ω 1Vrms Input shorte to groun Largesignal W =600Ω Smallsignal W at unity gain (ft) Noninverting Input Inverting Input Each Input <1.2 <5 >200 >10 >20M >20M 20pF nv pa k M Ω Ω C Page 3 P:(510) F:(510)

4 Moel 995FETTicha Moel 995FETTicha High Performance THDN Characteristics (Ta=25 C, Vs=±24V unless otherwise note) Total Harmonic DistortionNoise Inverting 0 (Av=1) versus Frequency (1Vrms (0V)In, OAD 600 Ω, 2222k W) THDN Large Signal Performance (Ta=25 C, Vs=±24V, 24u Voutput, Rloa variant, Gain variant as note below) NonInverting Conition Rloa = 75 Ω, Gain= 40 1 Rloa = 75 Ω, Gain= Rloa = 600 Ω, Gain= Total Harmonic DistortionNoise, NonInverting, Rloa=75 Ω, 24u output, 40 gain verses Frequency k 2k 5k 10k 20k Total Harmonic DistortionNoise NonInverting 6 (Av=2) versus Frequency (1Vrms (0V)In, OAD 600 Ω, 2222k W) k 2k 5k 10k 20k 50k 100k Total Harmonic DistortionNoise, NonInverting, Rloa=75 Ω, 24u output, 20 gain verses Frequency k 2k 5k 10k 20k Total Harmonic DistortionNoise NonInverting 6 (Av=2) versus Frequency (1Vrms (0V)In, OAD 600 Ω, 2222k W) k 2k 5k 10k 20k 50k 100k Total Harmonic DistortionNoise, NonInverting, Rloa=600 Ω, 24u output, 40 gain verses Frequency k 2k 5k 10k 20k Page k 2k 5k 10k 20k 50k 100k P:(510) F:(510)

5 Moel 995FETTicha THDN Large Signal Performance (20k, Vs=±24V, 24u Voutput, Rloa variant, Gain variant as note below) Inverting Conition Rloa = 75 Ω, Gain= Rloa = 75 Ω, Gain= Rloa = 600 Ω, Gain= Total Harmonic DistortionNoise, Inverting, Rloa=75 Ω, 24u output, 40 gain verses Frequency Moel 995FETTicha High Performance Gain Accuracy vs Frequency (Ta=25 C, Vs=±24V unless otherwise note) 6 (Av=2) Non inverting gain vs Frequency FREQUENCY RESPONSE k 2k 5k 10k 20k 50k 100k Total Harmonic DistortionNoise, Inverting, Rloa=75 Ω, 24u output, 20 gain verses Frequency k 2k 5k 10k 20k 50k 200k 0 (Av=Unity) Inverting gain vs Frequency FREQUENCY RESPONSE k 2k 5k 10k 20k 50k 100k Total Harmonic DistortionNoise, Inverting, Rloa=600 Ω, 24u output, 40 gain verses Frequency k 2k 5k 10k 20k 50k 200k THDN vs Amplitue (Ta=25 C, Vs=±24V unless otherwise note) k 2k 5k 10k 20k 50k 100k Page 5 V V P:(510) F:(510)

6 Moel 995FETTicha Moel 995FETTicha High Performance Linearity vs Amplitue (Ta=25 C, Vs=±24V unless otherwise note) NonInverting Av=2 (OAD =600 Ω) g Inverting Av=1 (OAD =600 Ω) g V V Power Supply Rejection Ratio Characteristics (Ta=25 C, Vs=±24V, Rs=0 Ω to Gn Rloa=10K Ω unless otherwise note) Non inverting, Unity gain (Av=1) vs Frequency, Positive Supply k 2k 5k 10k 20k 50k 100k 200k Non inverting, Unity gain (Av=1) vs Frequency, Negative Supply k 2k 5k 10k 20k 50k 100k 200k Page 6 P:(510) F:(510)

7 Moel 995FETTicha Moel 995FETTicha High Performance THD ResiualN Characteristics (Ta=25 C, Vs=±24V, 0V input, Rs=600 Ω Rloa=10K Ω unless otherwise note) 1k 0V, 6 gain (Av=2) Non inverting vs Frequency InputOutput Phase Characteristics (Ta=25 C, Vs=±24V, 0V input, Rs=600 Ω Rloa=10K Ω unless otherwise note) Non inverting input 6 gain (Av=2) vs Frequency e g k 2k 5k 10k 20k roaban Noise Characteristics (Ta=25 C, Vs=±24V, Rs=0 Ω to gn, Rloa=10K Ω unless otherwise note) Non inverting, 6 gain (Av=2) 22 to 22k NW vs Time k 2k 5k 10k 20k 50k 100k 200k Inverting input 0 gain (Av=0) vs Frequency Rg 10K NONVERTG Rf 10.0K Cc 15pF e g k 2k 5k 10k 20k 50k 100k 200k Rg 10K NONVERTG Rf 10.0K Cc 15pF 20 to 22Khz ANDPASS (see Jung) x1000 Cc 15pF Rg 10.0K Rf 10.0K Rg 4.99K VERTG Page 7 P:(510) F:(510)

8 Moel 995FETTicha Moel 995FETTicha High Performance Open Loop Frequency Response (Ta=25 C, Vs=±24V, Rloa=100K Ω unless otherwise note) Gain () k 2k 5k 10k 20k 50k 100k 500k 1M 2M 5M 10M 20M50M Full Power Frequency Response (Ta=25 C, Vs=±24V, Rloa=600 Ω unless otherwise note) V k 2k 5k 10k 20k 50k 100k 200k Page 8 P:(510) F:(510)

9 Moel 995FETTicha Moel 995FETTicha High Performance Pulse Response Ta=25 C, Vs=±24V OAD =600Ω Small Signal NonInverting Av=2 Large Signal NonInverting Av=2 Pulse Response Test Setup Rg NONVERTG Rf Ccomp Large Signal Inverting Av=10 Small Signal Inverting Av=Unity Pulse Response Test Setup Cc 5pF Rg Rf VERTG Overrive/Clipping Response Inverting Overrive/Clipping Response NonInverting Page 9 P:(510) F:(510)

10 Moel 995FETTicha Moel 995FETTicha High Performance Application Notes These are op amps with JFET input evices. These JFETs have large reverse breakown voltages from gate to source an rain an have low leakage high performance ioe clamps across the inputs internally. Aing clamps shown in Figure 1. externally is not recommene. The inputs also o not have gate resistors to groun. This allows the user to tailor the input impeance to the application. See Figure 1. below for a simplifie input schematic Figure 1. Simplifie iagram of FET ifferential input stage. Whenever there is a risk, either of input signals exceeing the voltages on the supplies, or of signals being present prior to powerup of the opamp, the terminals at risk shoul be protecte with ioes (preferably fast lowforwarvoltage Schottky ioes) to prevent amage from occurring. Currentlimiting resistors may also be neee to prevent the ioe current from becoming excessive (see Figure 2). This protection circuitry can cause problems of its own. Leakage current in the ioe(s) may affect the error buget of the circuit (an if glassencapsulate ioes are use, their leakage current may be moulate at 60 or 120 ue to photoelectric effects if expose to ambient lighting, thus contributing hum as well as c leakage current); Johnson noise in the currentlimiting resistor may worsen the circuit s noise performance; an bias current flowing in the resistor may prouce an apparent increase in offset voltage. All these effects must be consiere when esigning such protection. V Vss Figure 2. Simplifie protective circuitry of FET ifferential input stage. Page 10 All of the bias currents in these amplifiers are set by current sources. The rain currents for the amplifiers are therefore essentially inepenent of supply voltage. As with most amplifiers, care shoul be taken with lea ress, component placement an supply ecoupling in orer to ensure stability. For example, resistors from the output to an input shoul be place with the boy close to the input to minimize pickup an maximize the frequency of the feeback pole by minimizing the capacitance from the input to groun. The input capacitance of the 995FETTicha opamp is 22pF. A feeback pole is create when the feeback aroun any amplifier is resistive. The parallel resistance an capacitance from the input of the evice (usually the inverting input) to AC groun sets the frequency of the pole. In many instances the frequency of this pole is much greater than the expecte 3 frequency of the close loop gain an consequently there is negligible effect on stability margin. However, if the feeback pole is less than approximately six times the expecte 3 frequency a lea capacitor (Ccomp in Figure 3.) shoul be place from the output to the input of the op amp. The value of the ae capacitor shoul be such that the RC time constant of this capacitor an the resistance it parallels is greater than or equal to the original feeback pole time constant. Rg=10K Rf=10K Ccomp VERTG Figure 3. Feeback compensation shoul be place from the output to the input of the op amp. Rg=10K NONVERTG Rf=10K Ccomp The 995FETTicha Opamp is a high gain wie banwith evice an the esigner shoul analyze the application carefully to ensure operational success. The value of this capacitor is epenant on the value of feeback resistor chosen. Since correct compensation is important for optimum ac performance, it follows that no more compensation shoul be use than necessary to ensure aequate stability. However, there is a ifference between the inverting an noninverting configurations in the require compensation values if all other values are the same. Figures 4 an 5 emonstrates the effects of the feeback compensation on setting the upper frequency 3 banwith. P:(510) F:(510)

11 Moel 995FETTicha Moel 995FETTicha High Performance Application Notes (continue) The noninverting unity gain of 1 (0) is consiere the worst case insofar as compensation requirements are concerne, since there is no attenuation in the feeback path. As a rule of thumb, when the opamp is stabilize for this conition (β=1), it will be stable for all feeback conitions since there can be no more than 100 feeback V pF across 10K (Rf) 150pF across 10K (Rf) 100pF across 10K (Rf) 22pF across 10K (Rf) Application Notes (continue) The 995FETTicha iscrete opamp is normally stable with resistive, inuctive or smaller capacitive loas. Larger capacitive loas interact with the openloop output resistance to reuce the phase margin of the feeback loop, ultimately causing oscillation. With loop gains greater than unity, a capacitor across the feeback resistor will ai stability as iscusse previously. In all cases, the op amp will behave preictably only if the supplies are properly bypasse, groun loops are controlle an highfrequency feeback is erive irectly from the output terminal. Socalle capacitive loas are not always capacitive. A highq capacitor in combination with long leas or PC traces can present a seriesresonant loa to the op amp. In practice, this is not usually a problem; but the situation shoul be kept in min k 2k 5k 10k 20k 50k 200k Figure 4. Various Ccomp values across Rf=10K in the noninverting opamp configuation circuit shown in Figure V pF across 10K (Rf) 150pF across 10K (Rf) 100pF across 10K (Rf) 22pF across 10K (Rf) k 2k 5k 10k 20k 50k 200k Figure 5. Various Ccomp values for across Rf=10K in the inverting opamp configuation circuit shown in Figure 3. Less compensation is necessary when β is less than unity, or feeback is less than 100. Therefore, the compensation capacitance require for unity gain stability for the inverting stage of Figure 3 is one half of that require for the noninverting stage with the same resistor values. Large capacitive loas (incluing seriesresonant) can be accommoate by isolating the feeback amplifier from the loa as shown in Figure 6. The inuctor gives low output impeance at lower frequencies while proviing an isolating impeance at high frequencies. R1 3643Ω L uH R1 100Ω Figure 6. Isolating capacitive loas with an inuctor. The noninuctive resistor avois resonance problems with loa capacitance by reucing Q. The resistor kills the Q of series resonant circuits forme by capacitive loas. A low inuctance resistor is recommene. Optimum values of L an R epen upon the feeback gain an expecte nature of the loa, but are not critical. A 100 ohm resistor in series with the output is recommene when riving reactive loas, transformers, or where the output has the possibility of shorting to groun. The 995FETTicha opamp has the ability sink or source 250mA of current an the resistor ais in current limiting uring short circuit conitions Page 11 P:(510) F:(510)

12 Moel 995FETTicha Moel 995FETTicha High Performance Application Notes (continue) Low leakage film capacitors with highquality ielectric (polypropylene or COGNPO ceramic) shoul be use. LowESR power supply bypass capacitors with a small resistance in series with the power supply rails are essential for low noise operation. Precision low noise 1 metal film resistors shoul always be use in signal paths an feeback loops. Since these components can represent high impeance, an are susceptible to pickup an other noise sources, lea length an trace lengths shoul be minimize. Assemble circuits an PC s shoul be carefully cleane of flux resiue to prevent leakage paths or other spurious behavior. PC Sockets for 995FETTicha OpAmp It is highly recommene that the user not soler the pins irectly to the mating printe circuit boar. Overheating the pin creates a col soler joint at the other en. Permanant solering of the pin prevents easy removal of the moule. Lastly, solering prevents one from servicing components which may lie unerneath the moule. Many types of sockets for iameter pins are available from several manufacturers. uses an stocks the sockets from all three liste manufacturers below. These sockets can be solere or swage in your printe circuit boar. Aitionally, users can purchase a set of six from online. MillMax Part Number Pine Hollow Roa, PO ox 300 Oyster ay NY Wearnes Cambion Lt Part Number Peverial House Mill rige, Castleton Hope Valley S33 8WR Unite Kingom Concor Electronics Corp Part Number th Ave Level 1A Long Islan City, NY THE CONTENTS OF THIS DOCUMENT ARE PROVIDED CONNECTION WITH PRODUCTS. MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PULICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITH NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISG Y ESTOPPEL OR OTHERWISE, TO ANY TELLECTUAL PROPERTY RIGHTS IS GRANTED Y THIS DOCUMENT. TESTG AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT DEEMS NECESSARY TO SUPPORT PRODUCT WARRANTY. TESTG OF ALL PULISHED PARAMETERS AND SPECIFICATIONS OF EACH PRODUCT IS PERFORMED EFORE SHIPMENT. ASSUMES NO LIAILITY FOR APPLICATIONS ASSISTANCE OR UYER PRODUCT DESIGN. UYERS ARE RESPONSILE FOR THEIR PRODUCTS AND APPLICATIONS USG PRODUCTS. PRIOR TO USG OR DISTRIUTG ANY PRODUCTS THAT CLUDE COMPONENTS, UYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTG AND OPERATG SAFEGUARDS. EXCEPT AS PROVIDED TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, ASSUMES NO LIAILITY WHATSOEVER, AND DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATG TO THE SALE AND/OR USE OF PRODUCTS CLUDG LIAILITY OR WARRANTIES RELATG TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTAILITY, OR FRGEMENT OF ANY PATENT, COPYRIGHT OR OTHER TELLECTUAL PROPERTY RIGHT. LIFE SUPPORT AND CRITICAL COMPONENTS POLICY PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS LIFE SUPPORT DEVICES OR CRITICAL SYSTEMS WITH THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF. As use herein: Life support evices or systems are evices which (a) are intene for surgical implant into the boy, or (b) support or sustain life an whose failure to perform when properly use in accorance with instructions for use provie in the labeling can be reasonably expecte to result in a significant injury to the user. A critical component is any component in a life support evice or system whose failure to perform can be reasonably expecte to cause the failure of the life support evice or system or to affect its safety or effectiveness Page 12 P:(510) F:(510)

Model 994Enh-Ticha Dual LV Variant. Discrete Operational Amplifier. Model 994Enh-Ticha Dual Matched LV Variant. Discrete Operational Amplifier

Model 994Enh-Ticha Dual LV Variant. Discrete Operational Amplifier. Model 994Enh-Ticha Dual Matched LV Variant. Discrete Operational Amplifier Moel 994EnhTicha Dual LV Variant Moel 994EnhTicha Dual Matche LV Variant The 994EnhTicha is a ual high performance iscrete operational amplifier esigne for professional auio applications an areas where