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| TSH31 280MHz BANDWIDTH MOS INPUT SINGLE OPERATIONAL AMPLIFIER s VERY LOW INPUT CURRENT : 2pA typ s GAIN BANDWIDTH PRODUCT : 280MHz s GAIN OF 2 STABILITY s SLEW RATE : 300V/s s STANDARD PIN OUT DESCRIPTION The TSH31 is a low cost wide bandwidth single operational amplifier featuring extremely low input current of 2pA typ. Other features as high slew rate, fast settling time and high linearity make it suitable for many applications requiring speed and very high input impedance as photo cell amplifier, Fet probe, high speed precision integrator, sample and hold circuit. ORDER CODE Package Part Number TSH31I Temperature Range D -40C, +125C * D SO8 (Plastic Micropackage) PIN CONNECTIONS (top view) Offset Null 1 Inverting Input Non-inverting Input VCC 1 2 3 4 8 Offset Null 2 7 VCC+ 6 5 Output N.C. D = Small Outline Package (SO) - also available in Tape & Reel (DT) October 2000 1/5 TSH31 SCHEMATIC DIAGRAM 7 VCC + noninverting input 3 Internal V ref 6 output Cc 2 inverting input 1 Offset N1 8 Offset N2 4 VCC- INPUT OFFSET VOLTAGE NULL CIRCUIT TSH31 N1 N2 100kW V CC MAXIMUM RATINGS Symbol VCC Vid Vi Iin Toper Supply Voltage Differential Input Voltage Input Voltage Current On Offset Null Pins Operating Free-Air Temperature range Parameter Value 7 5 5 20 -40 to +125 Unit V V V V C OPERATING CONDITIONS Symbol VCC Vic Supply Voltage Common Mode Input Voltage Range Parameter Value 3 to 6 VCC to VCC -3 + Unit V V 2/5 TSH31 ELECTRICAL CHARACTERISTICS VCC = 5V, Tamb = 25C (unless otherwise specified) Symbol Vio DVio Iib Iio ICC Avd Vicm CMR SVR Vo Io GBP SR en m Input Offset Voltage Input Offset Voltage Drift Tmin. Tamb Tmax. Input Bias Current. Input Offset Current. Supply Current, no load Large Signal Voltage Gain Vo = 2.5V Input Common Mode Voltage Range Common-mode Rejection Ratio Vic = Vicm min. Supply Voltage Rejection Ratio VCC = 5V to 3V Output Voltage RL = 100 VCC = 5V RL = 100 200 -5 to +2 55 45 2.5 Parameter Min. Typ. 3 20 2 2 20 800 -5.5 to +2.5 95 65 +3.5 -3.7 70 280 300 20 40 300 200 40 Max. 15 Unit mV V/C pA pA mA V/V V dB dB V mA MHz V/s nV/Hz Degrees Output Short Circuit Current Vid = 1V, Vo = 0V Gain Bandwidth Product AVCL = 100, RL = 100, f = 7.5MHz Slew Rate Vin = 2V, AVCL = 1, RL = 100 Equivalent Input Voltage Noise f = 1MHz Phase Margin AVM = 1, RL = 100, CL = 15pF 3/5 TSH31 EVALUATION CIRCUIT +5V 10m F 50W Input 1kW 10nF 10nF 50W Output -5V 10m F 1kW CF PRINTED CIRCUIT LAYOUT As for any high frequency device, a few rules must be observed when designing the PCB to get the best performances from this high speed op amp. From the most to the least important points : order to decrease parasitic capacitance and inductance. u Use small resistor values to decrease time constant with parasitic capacitance. u Each power supply lead has to be bypassed to ground with a 10nF ceramic capacitor very close to the device and a 10F tantalum capacitor. u To provide low inductance and low resistance common return, use a ground plane or common point return for power and signal. u All leads must be wide and as short as possible especially for op amp inputs. This is in u Choose component sizes as small as possible (SMD). u On output, decrease capacitor load so as to avoid circuit stability being degraded which may cause oscillation. You can also add a serial resistor in order to minimise its influence. u One can add in parallel with feedback resistor a few pF ceramic capacitor CF adjusted to optimize the settling time. 4/5 TSH31 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO) Millimeters Dim. Min. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 0.1 0.65 0.35 0.19 0.25 4.8 5.8 1.27 3.81 3.8 0.4 4.0 1.27 0.6 8 (max.) 0.150 0.016 Typ. Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 5.0 6.2 0.189 0.228 Min. 0.004 0.026 0.014 0.007 0.010 Inches Typ. Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244 0.050 0.150 0.157 0.050 0.024 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information 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 STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2000 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom (c) http://www.st.com 5/5 |
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