® INA156 INA 156 For most current data sheet and other product information, visit www.burr-brown.com Single-Supply, Rail-to-Rail Output, CMOS INSTRUMENTATION AMPLIFIER FEATURES APPLICATIONS ● ● ● ● ● INDUSTRIAL SENSOR AMPLIFIERS: Bridge, RTD, Thermocouple, Flow, Position ● MEDICAL EQUIPMENT: ECG, EEG, EMG Amplifiers ● DRIVING A/D CONVERTERS ● PCMCIA CARDS ● AUDIO PROCESSING ● COMMUNICATIONS ● TEST EQUIPMENT ● LOW COST AUTOMOTIVE INSTRUMENTATION ● ● ● ● ● RAIL-TO-RAIL OUTPUT SWING: Within 20mV LOW OFFSET DRIFT: ±5µV/°C INTERNAL FIXED GAIN = 10V/V OR 50V/V SPECIFIED TEMPERATURE RANGE: –55°C to +125°C LOW INPUT BIAS CURRENT: 1pA WIDE BANDWIDTH: 550kHz in G = 10 HIGH SLEW RATE: 6.5V/µs LOW COST TINY MSOP-8 PACKAGES DESCRIPTION The INA156 is a low-cost CMOS instrumentation amplifier with rail-to-rail output swing optimized for low-voltage, single-supply operation. Wide bandwidth (550kHz in G = 10) and high slew rate (6.5V/µs) make the INA156 suitable for driving sampling A/D converters as well as general purpose and audio applications. Fast settling time allows use with higher speed sensors and transducers, and rapid scanning data acquisition systems. RG Gain can be set to 10V/V or 50V/V by pin strapping. Gains between these two values can be obtained with the addition of a single resistor. The INA156 is fully specified over the supply range of +2.7V to +5.5V. The INA156 is available in an MSOP-8 surface-mount package specified for operation over the temperature range –55°C to 125°C. G = 10 pins open G = 50 pins connected 1 V+ RG 8 7 INA156 5kΩ Ref 5 200kΩ 5kΩ 22.2kΩ 22.2kΩ 200kΩ + – VO = (VIN – VIN) • G + VREF – VIN 2 V+ 3 A1 6 A2 VO IN 4 V– International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 ©1999 Burr-Brown Corporation SBOS119 PDS-1565A Printed in U.S.A. December, 1999 SPECIFICATIONS: VS = +2.7V to +5.5V Boldface limits apply over the specified temperature range, TA = –55°C to +125°C At TA = +25°C, RL = 10kΩ connected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted. INA156E, A PARAMETER CONDITION INPUT Offset Voltage, RTI Over Temperature Drift vs Power Supply Over Temperature vs Time VOS dVOS/dT PSRR MIN TYP VS = +5.0V, VCM = VS/2 ±2.5 VS = +2.7V to +6V, VCM = 0.2 • VS ±5 ±50 ±0.4 MAX UNITS ±8 mV mV µV/°C µV/V µV/V µV/mo ±9 ±200 ±250 INPUT VOLTAGE RANGE Safe Input Voltage Common-Mode Range(1) Common-Mode Rejection Ratio Over Temperature VCM CMRR VS = 5.5V VS = 2.7V VS = 5.5V, 0.6V < VCM < 3.7V, G = 10 VS = 5.5V, 0.6V < VCM < 3.7V, G = 50 Over Temperature (V–) – 0.5 0.3 0.2 66 65 74 73 INPUT IMPEDANCE Differential Common-Mode (V+) + 0.5 5.2(2) 2.5(2) 78 87 Ω || pF Ω || pF 1013 || 3 1013 || 3 INPUT BIAS CURRENT Input Bias Current Offset Current ±1 ±1 IB IOS 10 VS = 5.5V, VO = 0.02V to 5.48V, G = 10 VS = 5.5V, VO = 0.05V to 5.45V, G = 50 vs Temperature Nonlinearity Over Temperature VS = 5.5V, G = 10 or 50 OUTPUT Voltage Output Swing from Rail Over Temperature Short-Circuit Current Capacitance Load (stable operation) FREQUENCY RESPONSE Bandwidth, –3dB BW Slew Rate Settling Time: 0.1% SR tS 0.01% TEMPERATURE RANGE Specified Range Operating Range Storage Range Thermal Resistance MSOP-8 Surface Mount SO-8 Surface Mount 5 Short-Circuit to Ground ±50 See Typical Curve G = 10 G = 50 VS = 5.5V, CL = 100pF VS = 5.5V, VO = 2V Step, CL = 100pF, G = 10 VS = 5.5V, VO = 2V Step, CL = 100pF, G = 50 VS = 5.5V, VO = 2V Step, CL = 100pF, G = 10 VS = 5.5V, VO = 2V Step, CL = 100pF, G = 50 50% Input Overload 550 110 6.5 5 11 8 15 0.2 See Typical Curve THD+N POWER SUPPLY Specified Voltage Range Operating Voltage Range Quiescent Current Over Temperature 50 G = 10 + 400kΩ/(10kΩ + RG) V/V ±0.08 ±0.4 ±2 ±10 ±0.1 ±0.8 ±15 ±30 ±0.005 ±0.015 ±0.015 G = 10, RL = 10kΩ, GERR < 0.4% +2.7 VIN = 0, IO = 0 VIN = 0, IO = 0 20 20 –55 –65 –65 θJA 150 150 V/V % ppm/°C % ppm/°C % of FSR % of FSR mV mV mA kHz kHz V/µs µs µs µs µs µs +5.5 +2.5 to +6 1.8 pA pA µV/Vp-p nV/√Hz nV/√Hz nV/√Hz fA/√Hz 4.5 260 99 40 2 GAIN Gain Equation Gain Error(3) vs Temperature Overload Recovery Total Harmonic Distortion + Noise ±10 ±10 RS = 0Ω, G = 10 or 50 NOISE, RTI Voltage Noise: f = 0.1Hz to 10Hz Voltage Noise Density: f = 10Hz f = 100Hz f = 1kHz Current Noise: f = 1kHz V V V dB dB dB dB 2.5 3.2 V V mA mA +125 +150 +150 °C °C °C °C/W °C/W NOTES: (1) For further information, refer to typical performance curves on common-mode input range. (2) Operation beyond (V+) – 1.8V (max) results in reduced common-mode rejection. See discussion and Figure 6 in the text of this data sheet. (3) Does not include error and TCR of additional optional gain-setting resistor in series with RG, if used. ® INA156 2 ELECTROSTATIC DISCHARGE SENSITIVITY PIN CONFIGURATION Top View MSOP RG 1 8 RG – VIN 2 V+ 7 V+ IN 3 6 VOUT V– 4 5 Ref This integrated circuit can be damaged by ESD. Burr-Brown recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. INA156 ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage, V+ to V– ................................................................... 7.5V Signal Input Terminals, Voltage(2) .................. (V–) – 0.5V to (V+) + 0.5V Current(2) .................................................... 10mA Output Short-Circuit(3) .............................................................. Continuous Operating Temperature .................................................. –65°C to +150°C Storage Temperature ..................................................... –65°C to +150°C Junction Temperature .................................................................... +150°C Lead Temperature (soldering, 10s) ............................................... +300°C NOTES: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. (2) Input terminals are diode-clamped to the power supply rails. Input signals that can swing more that 0.5V beyond the supply rails should be current limited to 10mA or less. (3) Short circuit to ground. PACKAGE/ORDERING INFORMATION PRODUCT PACKAGE PACKAGE DRAWING NUMBER INA156 EA MSOP-8 337 –55°C to +125°C A56 " " " " " SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER(1) TRANSPORT MEDIA INA156EA/250 INA156EA/2K5 Tape and Reel Tape and Reel NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “INA156EA/2K5” will get a single 2500-piece Tape and Reel. The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® 3 INA156 TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = 5.5V, RL = 10kΩ connected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted. GAIN vs FREQUENCY COMMON-MODE REJECTION RATIO vs FREQUENCY 40 100 35 90 30 G = 50 80 G = 50 G = 10 70 20 G =10 15 60 CMRR (dB) Gain (dB) 25 50 40 30 10 20 5 10 0 0 1 10 100 1k 10k 100k 1M 10M 0.1 1 10 100 Frequency (Hz) 100k 6 Maximum Output Voltage (Vp-p) 90 80 70 60 50 40 30 20 10 5 4 3 2 1 VS = 5.5V 0 0 1 10 100 1k 10k 100k 1 1M 10 100 1k 10k 100k 1M Frequency (Hz) Frequency (Hz) SHORT-CIRCUIT CURRENT AND QUIESCENT CURRENT vs POWER SUPPLY QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT vs TEMPERATURE 100 2.1 55 –ISC 50 2.5 IQ –ISC 2.0 80 2.0 +ISC +ISC 40 1.8 35 1.7 30 1.6 2.5 3 3.5 4.5 4.0 Supply Voltage (V) 5 5.5 1.5 40 1.0 20 0.5 0 75 6 ® INA156 60 0 1.5 25 ISC (mA) IQ IQ (mA) 1.9 45 4 –50 –25 0 25 50 75 Temperature (°C) 100 125 150 IQ (mA) PSRR (dB) 10k MAXIMUM OUTPUT VOLTAGE vs FREQUENCY POWER SUPPLY REJECTION RATIO vs FREQUENCY 100 ISC (mA) 1k Frequency (Hz) TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = 5.5V, RL = 10kΩ connected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted. TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY INPUT VOLTAGE AND CURRENT NOISE DENSITY vs FREQUENCY 10k 1 100 10 in 100 1 RL = 2kΩ 0.1 THD+N (%) 1k Current Noise (fA/√Hz) Voltage Noise (nV/√Hz) RL = 600Ω en G = 50 RL = 600Ω RL = 10kΩ 0.01 G = 10 RL = 2kΩ 10 0.1 10 1 100 1k 10k RL =10kΩ 0.001 0.1 100k 10 100 1k 10k Frequency (Hz) Frequency (Hz) 0.1Hz TO 10Hz VOLTAGE NOISE INPUT BIAS CURRENT vs TEMPERATURE 10k 1µV/div Input Bias Current (pA) 1k 100 10 1 Input-Referred 0.1 –75 500ms/div –50 –25 0 25 50 75 100 125 150 125 150 Temperature (°C) SLEW RATE vs POWER SUPPLY SLEW RATE vs TEMPERATURE 7 10 9 8 6 Slew Rate (V/µs) Slew Rate (Vµs) 6.5 5.5 5 7 6 5 4 3 2 4.5 1 4 0 2.5 3 3.5 4 4.5 5 5.5 6 75 Supply Voltage (V) –50 –25 0 25 50 75 100 Temperature (°C) ® 5 INA156 TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = 5.5V, RL = 10kΩ connected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted. OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION 18 16 16 14 14 Percent of Amplifiers (%) 18 12 10 8 6 4 12 10 8 6 4 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 0 2 4 6 8 10 12 14 16 18 20 10 8 6 4 2 0 –2 –4 0 –6 2 0 –8 2 –10 Production Distribution (%) VOS TYPICAL PRODUCTION DISTRIBUTION Offset Voltage (mV) Offset Voltage Drift (µV/°C) OVERSHOOT vs LOAD CAPACITANCE SETTLING TIME vs LOAD CAPACITANCE 60 20 18 12 Overshoot (%) 14 0.1%, G = 50 10 0.01%, G = 10 8 6 0.1%, G = 10 40 G = 10 30 20 G = 50 4 10 2 0 0 10 100 1k 10 10k 100 1k Load Capacitance (pF) Load Capacitance (pF) SMALL-SIGNAL STEP RESPONSE G = 10, CL = 100pF, RL = 10kΩ SMALL-SIGNAL STEP RESPONSE G = 50, CL = 100pF, RL = 10kΩ 100mV/div 100mV/div Settling Time (µs) 50 0.01%, G = 50 16 5µs/div 5µs/div ® INA156 6 10k TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = 5.5V, RL = 10kΩ connected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted. LARGE-SIGNAL STEP RESPONSE G = 10, G = 50, CL = 100pF, RL = 10kΩ OUTPUT VOLTAGE SWING vs OUTPUT CURRENT 5 1V/div Output Voltage (V) 4 +125°C –55°C +25°C 3 2 +125°C –55°C +25°C 1 0 0 1µs/div 10 20 50 60 70 80 90 100 INPUT COMMON-MODE RANGE vs OUTPUT VOLTAGE, G = 50 6 6 G = 50 G = 10 5 5 4 4 VCM (V) VCM (V) 40 Output Current (mA) INPUT COMMON-MODE RANGE vs REFERENCE VOLTAGE, G = 10 3 2 3 Ref = 0V Ref = 2.75V Ref = 5.5V 2 0.9V– + 0.1Ref < VCM < 0.9V+ + 0.1Ref 1 0.9V– + 0.04VOUT + 0.06Ref < VCM < 0.9V+ + 0.04VOUT + 0.06Ref 1 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 VREF (V) VOUT (V) COMMON-MODE REJECTION RATIO PRODUCTION DISTRIBUTION COMMON-MODE REJECTION RATIO PRODUCTION DISTRIBUTION 9 5 5.5 10 80dB 9 8 Production Distribution (%) G = 10 7 6 5 4 3 2 80dB G = 50 8 7 6 5 4 3 2 1 0 0 –200 –180 –160 –140 –120 –100 –80 –60 –40 –20 0 20 40 60 80 100 120 140 160 180 200 1 –500 –450 –400 –350 –300 –250 –200 –150 –100 –50 0 50 100 150 200 250 300 350 400 450 500 Production Distribution (%) 30 CMRR (µV/V) CMRR (µV/V) ® 7 INA156 APPLICATIONS INFORMATION OPERATING VOLTAGE Figure 1 shows the basic connections required for operation of the INA156. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins, as shown. The INA156 is fully specified and guaranteed over the supply range +2.7V to +5.5V, with key parameters guaranteed over the temperature range of –55°C to +125°C. Parameters that vary significantly with operating voltages, load conditions or temperature are shown in the Typical Performance Curves. The output is referred to the output reference terminal, Ref, which is normally set to VS/2. This must be a low-impedance connection to ensure good common-mode rejection. The INA156 can be operated from either single or dual power supplies. By adjusting the voltage applied to the reference terminal, the input common-mode voltage range and the output range can be adjusted within the bounds shown in the Typical Performance Curves. Figure 2 shows a bridge amplifier circuit operated from a single +5V power supply. The bridge provides a relatively small differential voltage on top of an input common-mode voltage near 2.5V. In addition, for the G = 50 configuration, the connection between pins 1 and 8 must be low-impedance. A connection impedance of 20Ω can cause a 0.2% shift in gain error. External Resistor RG: 10 < G < 50 V+ Gain Pins Connected: G = 50 0.1µF Gain Pins Open: G = 10 1 7 G = 10 + 8 200kΩ 5 22.2kΩ 22.2kΩ 10 20 30 40 50 Open 30k 10k 3.3k Short 200kΩ 6 A2 3 V+ RG (Ω) A1 2 – VIN DESIRED GAIN (V/V) 5kΩ 5kΩ Ref 400kΩ 10kΩ + RG + – – VIN ) • G + VREF VOUT = (VIN IN Also drawn in simplified form: V+ INA156 4 + VIN 3 1 0.1µF Single Supply – VIN Dual Supply 7 4 V– V– VOUT 5 8 2 6 INA156 Ref FIGURE 1. Basic Connections. +5V Bridge Sensor (2) + VIN 3 1 – VIN 7 INA156 VOUT = 0.01V to 4.99V 4 8 2 6 5 NOTES: (1) VREF should be adjusted for the desired output level, keeping in mind that the value of VREF affects the common-mode input range. See Typical Performance Curves. (2) For best performance, the common-mode input voltage should be kept away from the transition range of (V+) – 1.8V to (V+) – 0.8V. VREF(1) FIGURE 2. Single-Supply Bridge Amplifier. ® INA156 8 SETTING THE GAIN INPUT BIAS CURRENT RETURN Gain of 10 is achieved simply by leaving the two gain pins (1 and 8) open. Gain of 50 is achieved by connecting the gain pins together directly. In the G = 10 configuration, the gain error is less than 0.4%. In the G = 50 configuration, the gain error is less than 0.8%. The input impedance of the INA156 is extremely high— approximately 1013Ω, making it ideal for use with high-impedance sources. However, a path must be provided for the input bias current of both inputs. This input bias current is less than 10pA and is virtually independent of the input voltage. Gain can be set to any value between 10 and 50 by connecting a resistor RG between the gain pins according to the following equation: Input circuitry must provide a path for this input bias current for proper operation. Figure 5 shows various provisions for an input bias current path. Without a bias current path, the inputs will float to a potential that exceeds the commonmode range and the input amplifier will saturate. 10 + 400kΩ/(10kΩ + RG) (1) This is demonstrated in Figure 1 and is shown with the commonly used gains and resistor RG values. However, because the absolute value of internal resistors is not guaranteed, using the INA156 in this configuration will increase the gain error and gain drift with temperature, as shown in Figure 3. 2.0 400 360 Gain Drift 1.6 320 1.4 280 1.2 250 1.0 200 0.8 160 Gain Error 0.6 120 0.4 80 0.2 40 0 3 Gain Drift (ppm/°C) 1.8 Gain Error (%) If the differential source resistance is low, the bias current return path can be connected to one input (see the thermocouple in Figure 5). With higher source impedance, using two equal resistors provides a balanced input with advantages of lower input offset voltage due to bias current and better high-frequency common-mode rejection. 1 Microphone, Hydrophone, etc. 6 INA156 8 2 47kΩ 5 47kΩ VREF 0 10 15 25 20 30 35 40 45 50 Gain (V/V) 3 FIGURE 3. Typical Gain Error and Gain Error Drift with External Resistor. 1 Thermocouple 8 OFFSET TRIMMING 2 Offset voltage can be adjusted by applying a correction voltage to the reference terminal. Figure 4 shows an optional circuit for trimming the output offset voltage. The voltage applied to the Ref terminal is added to the output signal. An op amp buffer is used to provide low impedance at the Ref terminal to preserve good common-mode rejection. VREF V –(2) IN 6 INA156 8 2 6 INA156 8 2 Low-resistance thermocouple provides bias current return. 3 3 1 5 10kΩ 1 +(2) VIN 6 INA156 VO 5 VREF Center-tap provides bias current return (1) 5 Ref OPA336 Bridge Sensor 3 1 Adjustable Voltage 6 INA156 8 2 NOTES: (1) VREF should be adjusted for the desired output level. The value of VREF affects the common-mode input range. (2) For best performance, common-mode input voltage should be less than (V+) – 1.8V or greater than (V+) – 0.8V. 5 VREF FIGURE 4. Optional Trimming of Output Offset Voltage. Bridge resistance provides bias current return FIGURE 5. Providing an Input Common-Mode Current Path. ® 9 INA156 INPUT COMMON-MODE RANGE 5 The input common-mode range of the INA156 for various operating conditions is shown in the Typical Performance Curves. The common-mode input range is limited by the output voltage swing of A1, an internal circuit node. For the G = 10 configuration, output voltage of A1 can be expressed as: Input Offset Voltage (mV) VOUTA1 = – 1/9VREF + (1 + 1/9) VIN– (2) The input common-mode voltage range can be calculated using this equation, given that the output of A1 can swing to within 20mV of either rail. When the input common-mode range is exceeded (A1’s output is saturated), A2 can still be in linear operation and respond to changes in the non-inverting input voltage. However, the output voltage will be invalid. The common-mode range for the G = 50 configuration is included in the typical performance curve, “Input CommonMode Range vs Output Voltage.” 3 2 1 0 –1 –2 –3 –4 VS = 5.5V –5 0.0 0.5 1.5 1.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Input Common-Mode Voltage (V) FIGURE 6. Input Offset Voltage Changes with CommonMode Voltage. V+ NOTE: Output is referred to V+. INPUT RANGE FOR BEST ACCURACY The internal amplifiers have rail-to-rail input stages, achieved by using complementary n-channel and p-channel input pairs. The common-mode input voltage determines whether the p-channel or the n-channel input stage is operating. The transition between the input stages is gradual and occurs between (V+) – 1.8V to (V+) – 1V. Due to these characteristics, operating the INA156 with input voltages within the transition region of (V+) – 1.8V to (V+) – 0.8V results in a shift in input offset voltage, and reduced common-mode and power supply rejection performance. Typical patterns of the offset voltage change throughout the input common-mode range are illustrated in Figure 6. The INA156 can be operated below or above the transition region with excellent results. Figure 7 demonstrates the use of the INA156 in a single-supply, high-side current monitor. In this application, the INA156 is operated above the transition region. Ref 2 5 7 0.02Ω 1 50mV 6 INA156 4 8 3 IL 2.5A Load G = 10 Pins 1 and 8 Open FIGURE 7. Single-Supply, High-Side Current Monitor. RLIM RAIL-TO-RAIL OUTPUT 3 IOVERLOAD 10mA max A class AB output stage with common-source transistors is used to achieve rail-to-rail output. For resistive loads greater than 10kΩ, the output voltage can swing to within a few millivolts of the supply rail while maintaining low gain error. For heavier loads and over temperature, see the typical performance curve “Output Voltage Swing vs Output Current.” The INA156’s low output impedance at high frequencies makes it suitable for directly driving Capacitive Digital-to-Analog (CDAC) input A/D converters, as shown in Figure 9. 1 8 6 INA156 VOUT 5 2 RLIM VREF FIGURE 8. Input Current Protection for Voltages Exceeding the Supply Voltage. +5V INPUT PROTECTION 3 Device inputs are protected by ESD diodes that will conduct if the input voltages exceed the power supplies by more than 500mV. Momentary voltages greater than 500mV beyond the power supply can be tolerated if the current on the input pins is limited to 10mA. This is easily accomplished with input resistors RLIM, as shown in Figure 8. Many input signals are inherently current-limited to less than 10mA. Therefore, a limiting resistor is not required. 1 7 2 6 INA156 4 8 5 ADS7818 or ADS7834 12-Bits fSAMPLE = 500kHz NOTE: G = 10 configuration FIGURE 9. Driving Capacitive-Input A/D Converter. ® INA156 Transistion N-Channel Region Operation P-Channel Operation 4 10 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof. Copyright 2000, Texas Instruments Incorporated