TSH31 280MHz BANDWIDTH MOS INPUT SINGLE OPERATIONAL AMPLIFIER ■ VERY LOW INPUT CURRENT : 2pA typ ■ GAIN BANDWIDTH PRODUCT : 280MHz ■ GAIN OF 2 STABILITY ■ SLEW RATE : 300V/µs ■ 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 D SO8 (Plastic Micropackage) PIN CONNECTIONS (top view) Offset Null 1 1 8 Inverting Input 2 7 VCC+ Non-inve rting Input 3 6 Output 4 5 N.C . VCC Offset Null2 Temperature Range D TSH31I -40°C, +125°C • D = Small Outline Package (SO) - also available in Tape & Reel (DT) October 2000 1/5 TSH31 SCHEMATIC DIAGRAM 7 VCC + Internal Vre f non inverting input 3 6 output Cc 2 inverting input 1 Offse t N1 8 Offset N2 4 VCC- INPUT OFFSET VOLTAGE NULL CIRCUIT TS H31 N2 N1 100 kΩ VCC MAXIMUM RATINGS Symbol Parameter Value Unit VCC Supply Voltage ±7 V Vid Differential Input Voltage ±5 V Vi Input Voltage ±5 V Iin Current On Offset Null Pins ±20 V -40 to +125 °C Value Unit Toper Operating Free-Air Temperature range OPERATING CONDITIONS Symbol VCC Vic 2/5 Parameter Supply Voltage ±3 to ±6 V Common Mode Input Voltage Range - V + VCC to VCC -3 TSH31 ELECTRICAL CHARACTERISTICS VCC = ±5V, Tamb = 25°C (unless otherwise specified) Symbol Typ. Max. Unit Input Offset Voltage 3 15 mV Input Offset Voltage Drift T min. ≤ Tamb ≤ Tmax. 20 Iib Input Bias Current . 2 300 2 200 pA 20 40 mA Vio DVio Parameter Min. Iio Input Offset Current . ICC Supply Current, no load VCC = ±5V Avd Large Signal Voltage Gain Vo = ±2.5V RL = 100Ω Vicm Input Common Mode Voltage Range CMR SVR Vo Io GBP SR µV/°C pA V/V 200 800 -5 to +2 -5.5 to +2.5 Common-mode Rejection Ratio V ic = Vicm min. 55 95 Supply Voltage Rejection Ratio V CC = ±5V to ±3V 45 65 ±2.5 +3.5 -3.7 V ±70 mA Output Voltage RL = 100Ω Output Short Circuit Current Vid = ±1V, Vo = 0V Gain Bandwidth Product A VCL = 100, RL = 100Ω, f = 7.5MHz Slew Rate V in = ±2V, AVCL = 1, RL = 100Ω en Equivalent Input Voltage Noise φm Phase Margin A VM = 1, RL = 100Ω, C L = 15pF 280 300 f = 1MHz V dB dB MHz V/µs 20 nV/√Hz 40 Degrees 3/5 TSH31 EVALUATION CIRCUIT +5V 1 0µ F 5 0Ω 10nF Input 50 Ω Output 1kΩ 1 0nF -5V 10 µF 1kΩ 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 : ❑ Each power supply lead has to be bypassed to ground with a 10nF ceramic capacitor very close to the device and a 10µF tantalum capacitor. ❑ To provide low inductance and low resistance common return, use a ground plane or common point return for power and signal. ❑ All leads must be wide and as short as possible especially for op amp inputs. This is in 4/5 ❑ ❑ ❑ ❑ order to decrease parasitic capacitance and inductance. Use small resistor values to decrease time constant with parasitic capacitance. Choose component sizes as small as possible (SMD). 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. One can add in parallel with feedback resistor a few pF ceramic capacitor CF adjusted to optimize the settling time. TSH31 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO) Millimeters Inches Dim. Min. A a1 a2 a3 b b1 C c1 D E e e3 F L M S Typ. Max. 0.65 0.35 0.19 0.25 1.75 0.25 1.65 0.85 0.48 0.25 0.5 4.8 5.8 5.0 6.2 0.1 Min. Typ. Max. 0.026 0.014 0.007 0.010 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.189 0.228 0.197 0.244 0.004 45° (typ.) 1.27 3.81 3.8 0.4 0.050 0.150 4.0 1.27 0.150 0.016 0.6 0.157 0.050 0.024 8° (max.) Information furni shed is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibili ty for the consequences of use of such information nor for any infring ement of patents or other right s 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 mention ed in this publ ication are subject to change without notice. This public ation supersedes and replaces all information previously suppl ied. STMicroelectronics products are not authorized for use as critical components in life suppo rt devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 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 http://w ww.st.com 5/5