LSK489A LINEAR | Alldatasheet

Document overview

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Technical content

Features

Low Noise (f = 1kHz, NBW = 1Hz) en = 1.8nV/√Hz Low Input Capacitance Ciss = 4pF

  • Low Noise: en = 1.8nV/√Hz (typ), f = 1kHz, NBW = 1Hz
  • Very Low Common Source Input Capacitance of CISS = 4pF – typ
  • High Slew Rate
  • Low Offset/Drift Voltage
  • Low Gate Leakage IGSS and IG
  • High CMRR 102 dB Benefits
  • Tight Differential Voltage Match vs. Current
  • Improved Op Amp Speed Settling Time Accuracy
  • Minimum Input Error Trimming Error Voltage
  • Lower Intermodulation Distortion Due to Low Input Capacitance

Applications

  • Wideband Differential Amplifiers
  • High Speed Temperature Compensated Single Ended Input Amplifier
  • High Speed Comparators
  • Impedance Converters
  • Sonobouys and Hydrophones
  • Acoustic Sensors

Description

The LSK489 is the industry’s lowest input capacitanc e and low -noise monolithic dual N -Channel JFET. Low input capacitance substantially reduces intermodulation distortion. In addition, these dual JFETs feature tight offset voltage and low drift over temperature range, and are targeted for use in a wide rang e of precision instrumentation and sensor applications. The LSK489 is available in surface mount plastic SOIC 8L and SOT -23 6L, as well as thru -hole metal TO -71 6L packages. For an equivalent single N-Channel version refer to the LSK189 datasheet. LSK489 TO-71 6L and SOIC 8L are fit, form and pin compatible to the same LSK389 product. The LSK489 provides a dramatic increase in capabilities for a wide range of low-noise applications. The most significant aspect of the LSK489 is how it combines a noise level nearly as low as the LSK389 while having much lower gate-to-drain capacitance, 4pF versus the 25pF . The slightly higher noise of the LSK489, versus the LSK389, is not significant in most instances, while the much lower capacitance enables designers to produce simpler, more elegant circuit designs with fewer devices that cost less in production. Also notice that the LSK489 and LSK389 TO -71 and SOIC packages are the same and pin compatible, therefo re, they can be used interchangeably. Like the Linear Sys tems LSK389, the LSK489 features a unique design construction of interleaving both JFETs on the same piece of silicon to provide excellent matching and ther mal tracking, as well a low -noise profile having nearly zero popcorn noise. IDSS range is divided in to two segments providing designers improved resolution , which are A grade (ΔIDSS = 6mA ) and B grade (ΔIDSS = 7mA). Contact Linear Systems for improved En, IDSS, VGS(off), Δ VGS or any other limits. Based on new limits, LS will assign a new SELXXXX code to be used in shipments. * For equivalent single version, see LSK189 LSK489A/B Low Noise, Monolithic Dual N-Channel JFET Amplifier INDUSTRY’S LOWEST INPUT CAPACITANCE MONOLITHIC DUAL N-CHANNEL JFET SOIC-A Top View SOT-23 Top View TO-71 Top View

Doc 201151 04/12/2022 Rev# A40 ECN# LSK489 www.linearsystems.com Page 2 of 7 LSK489A/B Low Noise, Low Capacitance, Monolithic Dual N-Channel JFET Amplifier Matching Characteristics @ 25°C (unless otherwise stated) Symbol Characteristic Min. Typ. Max Units Conditions GS2GS1 VV − Differential Gate to Source Cutoff Voltage - 8 20 mV VDS = 10V, ID = 1mA DSS2 DSS1 I I Gate to Source Saturation Current Ratio 0.9 - 1.0 - VDS = 10V, VGS = 0V CMRR Common Mode Rejection Ratio -20 log│∆VGS1-2/∆VDS│ 95 102 - dB VDS = 10V to 20V, ID = 200µA en Noise Voltage - 1.8 - nV/√Hz VDS = 15V, ID = 2.0mA, f = 1kHz, NBW = 1Hz en Noise Voltage - 3.5 - nV/√Hz VDS = 15V, ID = 2.0mA, f = 10Hz, NBW = 1Hz CISS Common Source Input Capacitance - 4 - pF VDS = 15V, ID = 500µA, f = 1MHz CRSS Common Source Reverse Transfer Capacitance - 2 - pF Electrical Characteristics @ 25°C (unless otherwise stated) Symbol Characteristic Min. Typ. Max Units Conditions BVGSS Gate to Source Breakdown Voltage -60 - - V VDS = 0, ID = -1nA V(BR)G1 - G2 Gate to Gate Breakdown Voltage ±30 ±45 - V IG= ±1µA, ID=IS=0 A (Open Circuit) VGS(OFF) Gate to Source Pinch-off Voltage -1.5 - -3.5 V VDS = 15V, ID = 1nA VGS Gate to Source Operating Voltage -0.5 - -3.5 V VDS = 15V, ID = 500µA IDSS Drain to Source Saturation Current LSK489A 2.5 5.5 8.5 mA VDG = 15V, VGS = 0 LSK489B 8.0 11.5 15.0 IG Gate Operating Current - -2 -25 pA VDG = 15V, ID = 200µA - -0.8 -10 nA TA = 125°C IGSS Gate to Source Leakage Current - - -100 pA VDG = -15V, VDS = 0 Gfs Full Conductance Transconductance 1500 - - µS VDG = 15V, VGS = 0, f = 1kHz Gfs Transconductance 1000 1500 - µS VDG = 15V, ID = 500µA GOS Full Output Conductance - - 40 µS VDG = 15V, VGS = 0 GOS Output Conductance - 1.8 2.7 µS VDG = 15V, ID = 200µA

Doc 201151 04/12/2022 Rev# A40 ECN# LSK489 www.linearsystems.com Page 3 of 7 LSK489A/B Low Noise, Low Capacitance, Monolithic Dual N-Channel JFET Amplifier Notes Package Dimensions DIMENSIONS IN INCHES SOT-23 DIMENSIONS IN MILLIMETERS 0.95 1.90 1.50 1.75 2.60 3.00 0.35 0.50 2.80 3.00 0.90 1.30 0.00 0.15 0.09 0.20 0.10 0.60 Six Lead 0.210 0.170 DIMENSIONS IN INCHES DIMENSIONS IN MILLIMETERS TO-71 Six Lead SOIC-A

8 Lead

  1. Absolute maximum ratings are limiting values above which serviceability may be impaired. 2. Pulse width ≤2ms. 3. All MIN/TYP/MAX Limits are absolute values. Negative signs indicate electrical polarity only. 4. Derate 2.4 mW/°C above 25°C. 5. Derate 4 mW/°C above 25°C. Information furnished by Linear Integrated Systems is believed to be accurate and reliable. However, no responsibility is assumed for its use; nor for any infringement 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 Linear Integrated Systems. 0.049 0.061

Doc 201151 04/12/2022 Rev# A40 ECN# LSK489 www.linearsystems.com Page 4 of 7 LSK489A/B Low Noise, Low Capacitance, Monolithic Dual N-Channel JFET Amplifier Typical Characteristics

Doc 201151 04/12/2022 Rev# A40 ECN# LSK489 www.linearsystems.com Page 5 of 7 LSK489A/B Low Noise, Low Capacitance, Monolithic Dual N-Channel JFET Amplifier Typical Characteristics (Cont’d)

Doc 201151 04/12/2022 Rev# A40 ECN# LSK489 www.linearsystems.com Page 6 of 7 LSK489A/B Low Noise, Low Capacitance, Monolithic Dual N-Channel JFET Amplifier Typical Characteristics (Cont’d)

Doc 201151 04/12/2022 Rev# A40 ECN# LSK489 www.linearsystems.com Page 7 of 7 LSK489A/B Low Noise, Low Capacitance, Monolithic Dual N-Channel JFET Amplifier Typical Characteristics (Cont’d)