INA1 INA1 High Speed FET-Input INSTRUMENTATION AMPLIFIER
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INA1
INA1
INA1
High Speed FET-Input INSTRUMENTATION AMPLIFIER
FEATURES
INPUT: 20pA OFFSET VOLTAGE: 500µV OFFSET VOLTAGE DRIFT: 5µV/°C HIGH COMMON-MODE REJECTION: 106dB 8-PIN PLASTIC DIP, SOL-16 SOIC HIGH SPEED: 100, 0.01%)
DESCRIPTION
INA111 high speed, FET-input instrumentation amplifier offering excellent performance. INA111 uses current-feedback topology providing extended bandwidth (2MHz fast settling time (4µs 0.01% 100). single external resistor sets gain from over 1000. Offset voltage drift laser trimmed excellent accuracy. INA111's inputs reduce input bias current under 20pA, simplifying input filtering limiting circuitry. INA111 available 8-pin plastic DIP, SOL-16 surface-mount packages, specified -40°C +85°C temperature range.
APPLICATIONS
MEDICAL INSTRUMENTATION DATA ACQUISITION
(13) INA111 (15) (10) (11) Feedback (12) Connected Internally G=1+
(SOIC)
International Airport Industrial Park Mailing Address: 11400, Tucson, 85734 Street Address: 6730 Tucson Blvd., Tucson, 85706 Tel: (520) 746-1111 Twx: 910-952-1111 Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
1992 Burr-Brown Corporation
PDS-1143E
Printed U.S.A. March, 1998
INA1
SPECIFICATIONS
ELECTRICAL
+25°C, ±15V, unless otherwise noted. INA111BP, PARAMETER CONDITIONS INA111AP, UNITS
INPUT Offset Voltage, Initial +25°C Temperature TMIN TMAX Power Supply ±18V Impedance, Differential Common-Mode Input Common-Mode Range VDIFF Common-Mode Rejection ±10V, 1000 BIAS CURRENT OFFSET CURRENT NOISE VOLTAGE, 100Hz 1kHz 10kHz 0.1Hz 10Hz Noise Current 10kHz GAIN Gain Equation Range Gain Gain Error 1000,
±100 500/G 10/G +10/G 1012 1012 ±0.1 (50k/RG)
±500 2000/G 100/G 100/G
±200 500/G 20/G
±1000 5000/G 100/G
µV/°C µV/V
nV/Hz nV/Hz nV/Hz µVp-p fA/Hz ppm/°C ppm/°C
100, 1000, 1000 5mA, TMIN TMAX ±0.01 ±0.1 ±0.15 ±0.25 ±0.0005 ±0.001 ±0.001 ±0.005 ±12.7 1000 +30/-25 ±3.3
Gain Temperature Resistance(1) Nonlinearity
10000 ±0.02 ±0.5 ±0.5 ±100 ±0.005 ±0.005 ±0.005 ±0.02
0.05 ±0.7 ±0.01 ±0.01 ±0.04
OUTPUT Voltage Load Capacitance Stability Short Circuit Current FREQUENCY RESPONSE Bandwidth, -3dB
V/µs °C/W
Slew Rate Settling Time, 0.01%
Overload Recovery POWER SUPPLY Voltage Range Current TEMPERATURE RANGE Specification Operating
1000 ±10V, 1000 Overdrive
±4.5
Specification same INA111BP. NOTE: Temperature coefficient "50k" term gain equation. information provided herein believed reliable; however, BURR-BROWN assumes responsibility inaccuracies omissions. BURR-BROWN assumes responsibility this information, such information shall entirely user's risk. Prices specifications subject change without notice. patent rights licenses circuits described herein implied granted third party. BURR-BROWN does authorize warrant BURR-BROWN product life support devices and/or systems.
INA1
CONFIGURATIONS
View
ELECTROSTATIC DISCHARGE SENSITIVITY
This integrated circuit damaged ESD. Burr-Brown recommends that integrated circuits handled with appropriate precautions. Failure observe proper handling installation procedures cause damage. damage range from subtle performance degradation complete device failure. Precision integrated circuits more susceptible damage because very small parametric changes could cause device meet published specifications. ORDERING INFORMATION
PRODUCT PACKAGE 8-Pin Plastic 8-Pin Plastic SOL-16 Surface-Mount SOL-16 Surface-Mount TEMPERATURE RANGE -40°C -40°C -40°C -40°C +85°C +85°C +85°C +85°C INA111AP INA111BP INA111AU INA111BU
V-IN
View V-IN V+IN
SOL-16 Surface Mount Feedback
PACKAGE INFORMATION
PRODUCT INA111AP INA111BP INA111AU INA111BU PACKAGE 8-Pin Plastic 8-Pin Plastic 16-Pin Surface 16-Pin Surface Mount Mount PACKAGE DRAWING NUMBER(1)
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage ±18V Input Voltage Range (V-) -0.7V (V+) +15V Output Short-Circuit ground) Continuous Operating Temperature -40°C +125°C Storage Temperature -40°C +125°C Junction Temperature +150°C Lead Temperature (soldering, 10s) +300°C NOTE: Stresses above these ratings cause permanent damage.
NOTE: detailed drawing dimension table, please data sheet, Appendix Burr-Brown Data Book.
INA1
TYPICAL PERFORMANCE CURVES
+25°C, ±15V, unless otherwise noted.
GAIN FREQUENCY
COMMON-MODE REJECTION FREQUENCY Common-Mode Rejection (dB)
Gain (V/V)
100k Frequency (Hz)
100k
Frequency (Hz)
INPUT COMMON-MODE VOLTAGE RANGE OUTPUT VOLTAGE Common-Mode Voltage
Limit Swing VD/2
POWER SUPPLY REJECTION FREQUENCY
(Any Gain)
Power Supply Rejection (dB)
Limit tput Swin2
VD/2
utpu
Output Swing Limit
Output Swing Limit
ited
100k
Output Voltage
Frequency (Hz)
INPUT-REFERRED NOISE VOLTAGE FREQUENCY
SETTLING TIME GAIN
Input-Referred Noise Voltage (nV/Hz)
Settling Time (µs)
0.01%
100,
0.1%
Frequency (Hz)
Gain (V/V) 1000
INA1
TYPICAL PERFORMANCE CURVES (CONT)
+25°C, ±15V, unless otherwise noted.
OFFSET VOLTAGE WARM-UP TIME
Referred-to-Input Change (µV)
INPUT BIAS CURRENT TEMPERATURE -100
Referred-to-Input Change (µV)
Input Bias Current
Time From Power Supply Turn-On (Minutes)
100p 0.1p 0.01p Temperature (°C)
-200 -300
INPUT BIAS CURRENT DIFFERENTIAL INPUT VOLTAGE -10m -15.7V
-10m
INPUT BIAS CURRENT COMMON-MODE INPUT VOLTAGE -15.7V
Input Bias Current
-100µ -10µ +10p +100p Differential Overload Voltage NOTE: input grounded. +15.7V
Input Bias Current
-100µ
-10µ
+15.7V +10p Common-Mode Voltage
MAXIMUM OUTPUT VOLTAGE SWING FREQUENCY Peak-to-Peak Amplitude 100k Frequency (Hz)
OUTPUT CURRENT LIMIT TEMPERATURE
Short-Circuit Current (mA)
-ICL +ICL
Temperature (°C)
INA1
TYPICAL PERFORMANCE CURVES (CONT)
+25°C, ±15V, unless otherwise noted.
QUIESCENT CURRENT TEMPERATURE
TOTAL HARMONIC DISTORTION NOISE FREQUENCY 3Vrms, Measurement 80kHz
Quiescent Current (mA)
Single-Ended Drive
0.01
0.001
0.0001
Differential Drive
Temperature (°C)
Frequency (Hz)
LARGE SIGNAL RESPONSE,
SMALL SIGNAL RESPONSE,
+0.1 -0.1
Time (µs)
Time (µs)
LARGE SIGNAL RESPONSE,
SMALL SIGNAL RESPONSE,
+0.1
-0.1
Time (µs)
Time (µs)
INA1
APPLICATION INFORMATION
Figure shows basic connections required operation INA111. Applications with noisy high impedance power supplies require decoupling capacitors close device pins shown. output referred output reference (Ref) terminal which normally grounded. This must low-impedance connection assure good common-mode rejection. resistance series with will cause typical device with 90dB degrade approximately 80dB SETTING GAIN Gain INA111 connecting single external resistor,
term equation comes from internal feedback resistors. These on-chip metal film resistors which laser trimmed accurate absolute values. accuracy temperature coefficient these resistors included gain accuracy drift specifications INA111. stability temperature drift external gain setting resistor, also affects gain. RG's contribution gain accuracy drift directly inferred from gain equation (1). resistor values required high gain make wiring resistance important. Sockets wiring resistance, which will contribute additional gain error (possibly unstable gain error) gains approximately greater. DYNAMIC PERFORMANCE typical performance curve "Gain Frequency" shows that INA111 achieves wide bandwidth over wide range gain. This current-feedback topology INA111. Settling time also remains excellent over wide gains.
Commonly used gains resistor values shown Figure
0.1µF numbers package.
INA1- (VIN VIN)
G=1+
Load
0.1µF
DESIRED GAIN 1000 2000 5000 10000
Connection 50.00k 12.50k 5.556k 2.632k 1.02k 505.1 251.3 100.2 50.05 25.01 10.00 5.001
NEAREST Connection 49.9k 12.4k 5.62k 2.61k 1.02k 49.9 24.9 4.99
Also drawn simplified form: INA111
FIGURE Basic Connections
INA1
INA111 exhibits approximately rise gain 2MHz unity gain. This result current-feedback topology indication instability. Unlike with poor phase margin, rise response predictable +6dB/octave response zero. simple pole 700kHz lower will produce flat passband response (see Input Filtering). INA111 provides excellent rejection high frequency common-mode signals. typical performance curve, "Common-Mode Rejection Frequency" shows this behavior. inputs properly balanced, however, common-mode signals converted differential sig- nals. connections directly adjacent each other, from source signal input pins. possible ground plane under both input traces. Avoid running other potentially noisy lines near inputs. NOISE ACCURACY PERFORMANCE INA111's input circuitry provides input bias current high speed. achieves lower noise higher accuracy with high impedance sources. With source impedances INA114 provide lower offset voltage drift. very source impedance (1k), INA103 provide improved accuracy lower noise. OFFSET TRIMMING INA111 laser trimmed offset voltage drift. Most applications require external offset adjustment. Figure shows optional circuit trimming output offset voltage. voltage applied terminal summed output. impedance must maintained this node assure good common-mode rejection. shown maintains output impedance high frequency. Trim circuits with higher source impedance should buffered with follower circuit assure impedance pin.
INPUT BIAS CURRENT RETURN PATH input impedance INA111 extremely high- approximately 1012. However, path must provided input bias current both inputs. This input bias current typically less than 10pA. High input impedance means that this input bias current changes very little with varying input voltage. Input circuitry must provide path this input bias current INA111 operate properly. Figure shows various provisions input bias current path. Without bias current return path, inputs will float potential which exceeds common-mode range INA111 input amplifiers will saturate. differential source resistance low, bias current return path connected input (see thermocouple example Figure With higher source impedance, using resistors provides balanced input with possible advantages lower input offset voltage bias current better high-frequency common-mode rejection.
Crystal Ceramic Transducer
INA1
Thermocouple
INA1
INA1VIN INA111 100µA REF200
Center-tap provides bias current return.
OPA177 ±10mV Adjustment Range
100(1)
FIGURE Providing Input Common-Mode Current Path. INPUT COMMON-MODE RANGE linear common-mode range input amps INA111 approximately ±12V from power supplies). output voltage increases, however, linear input range will limited output voltage swing input amplifiers, common-mode range related output voltage complete amplifier- performance curve "Input Common-Mode Range Output Voltage".
100(1)
NOTE: wider trim range required high gains, scale resistor values larger
100µA REF200
FIGURE Optional Trimming Output Offset Voltage.
INA1
combination common-mode differential input voltage cause output saturate. Figure shows output voltage swing expressed terms common-mode differential input voltages. applications where input common-mode range must maximized, limit output voltage swing connecting INA111 lower gain (see performance curve "Input Common-Mode Voltage Range Output Voltage"). necessary, gain after INA111 increase voltage swing. Input-overload often produces output voltage that appears normal. example, consider input voltage +14V input +15V other input will obviously exceed linear common-mode range both input amplifiers. Since both input amplifiers saturated nearly same output voltage limit, difference voltage measured output amplifier will near zero. output INA111 will near even though both inputs overloaded. INPUT PROTECTION Inputs INA111 protected input voltages from 0.7V below negative supply above positive power supply voltages. input current limited less than 1mA, clamp diodes required; internal junctions will clamp input voltage safe levels. input source supply more than 1mA, external clamp diodes shown Figure source current limited with series resistors shown. Resistor values greater than will contribute noise circuit. diode formed with 2N4117A transistor shown Figure assures leakage. Common signal diodes such
1N4148 have leakage currents greater than input bias current INA111 usually sensitive light. INPUT FILTERING INA111's input allows input filter without creating large offsets input bias current. Figure shows proper implementation this input filter preserve INA111's excellent high frequency commonmode rejection. Mismatch common-mode input capacitance C2), either from stray capacitance
INA1
2N4117A Leakage
Diodes:
FIGURE Input Protection Voltage Clamp.
INA111 G=1+
FIGURE Voltage Swing
INA1
mismatched values, causes high frequency common-mode signal converted differential signal. This degrades common-mode rejection. differential input capacitor, reduces bandwidth mitigates effects mismatch Make much larger than properly matched, also improve CMR. OUTPUT VOLTAGE SENSE (SOL-16 Package Only) surface-mount version INA111 separate output sense feedback connection (pin 12). must connected, usually output terminal, proper operation. (This connection made internally version INA111.) output feedback connection used sense output voltage directly load best accuracy. Figure shows drive load through series interconnection resistance. Remotely located feedback paths cause instability. This generally eliminated with high frequency feedback path through
Surface-mount package version only.
Feedback INA111
1000pF
Load
Equal resistance here preserves good common-mode rejection.
FIGURE Remote Load Ground Sensing.
INA111
2R1C1
NOTE: preserve good frequency CMR, make
INA111
FIGURE High-Pass Input Filter.
10C1
±18V Isolated Power ±15V
FIGURE Input Low-Pass Filter.
INA1+10V
ISO122
Bridge INA111
Isolated Common
FIGURE Galvanically Isolated Instrumentation Amplifier. FIGURE Bridge Transducer Amplifier.
INA1
OPA177
INA111 0.1µF
50nF
INA111
OPA602
f-3dB 2R1C1 1.59Hz
Make where Load
FIGURE AC-Coupled Instrumentation Amplifier.
FIGURE Voltage Controlled Current Source.
22.1k 22.1k
INA111
NOTE: Driving shield minimizes degradation unequally distributed capacitance input line. shield driven approximately below common-mode input voltage. OPA602
2(22.1k) effective
FIGURE Shield Driver Circuit.
MPC800 Channel INA111 ADS574 Bits
Channel
FIGURE Multiplexed-Input Data Acquisition System.
INA1
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