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ICL7650 ICL7653 ICL7650B ICL7653B
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Maxim's ICL7650/ICL7653 chopper-stabilized amplifiers, ideal low-level signal processing applications. Featuring high performance versatility, these devices combine input offset voltage, input bias current, wide bandwidth, exceptionally drift over time temperature. offset achieved through nulling scheme that provides continuous error correction. nulling amplifier alternately nulls itself main amplifier. result input offset voltage that held minimum over entire operating temperature range. ICL7650B/ICL7653B exact replacements Intersil's ICL7650B/ICL7653B. These devices have 10µV offset voltage, 0.1µV/°C input offset voltage temperature coefficient, 20pA bias current-all specified over commercial temperature range. 14-pin version available that used with either internal external clock. 14-pin version output voltage clamp circuit minimize overload recovery time.
ICL7650/53 Improved Second Sources ICL7650B/53B Lower Supply Current: Offset Voltage: Offset Voltage Trimming Needed High-Gain CMRR PSRR: 120dB Lower Offset Drift with Time Temperature Extended Common-Mode Voltage Range Input Bias Current: 10pA Monolithic, Low-Power CMOS Design
PART ICL7650CSA ICL7650CSD ICL7650CPA ICL7650CPD ICL7650CTV ICL7650C/D ICL7650IJA ICL7650IJD ICL7650MTV ICL7650MJD ICL7650BCSA ICL7650BCSD ICL7650BCPA ICL7650BCPD ICL7650BCTV ICL7650BC/D ICL7653CSA ICL7653CPA TEMP. RANGE +70°C +70°C +70°C +70°C +70°C +70°C -20°C +85°C -20°C +85°C -55°C +125°C -55°C +125°C +70°C +70°C +70°C +70°C +70°C +70°C +70°C +70°C +70°C -20°C +85°C -55°C +125°C +70°C +70°C +70°C PIN-PACKAGE Plastic Plastic TO-99 Dice CERDIP CERDIP CERDIP CERDIP Plastic Plastic TO-99 Dice Plastic TO-99 CERDIP CERDIP Plastic TO-99
Condition Amplifier Precision Amplifier Instrumentation Amplifier Thermocouples Thermistors Strain Gauges
Typical Operating Circuit
CLAMP INPUT OUTPUT ICL7650 ICL7653 INVERTING AMPLIFIER WITH OPTIONAL CLAMP
ICL7653CTV ICL7653IJA ICL7653MTV ICL7653BCSA ICL7653BCPA ICL7653BCTV
Configurations appear data sheet.
Maxim Integrated Products
free samples latest literature, visit www.maxim-ic.com phone 1-800-998-8800. small orders, phone 1-800-835-8769.
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage V-).18V Input Voltage .(V+ 0.3V) 0.3V) Voltage Oscillator Control Pins (except EXT/CLOCK IN).V+ VVoltage EXT/CLOCK .(V+ 0.3V) 6.0V) Duration Output Short Circuit .Indefinite Current into .10mA Current into while Operating (Note 1).100µA Continuous Total Power Dissipation +70°C) 8-Pin (derate 5.88mW/°C above +70°C).471mW 8-Pin PDIP (derate 6.9mW/°C above +70°C).552mW 8-Pin CERDIP (derate 8.0mW/°C above +70°C).640mW 8-Pin TO-99 (derate 6.7mW/°C above +70°C).533mW 14-Pin (derate 8.3mW/°C above +70°C).667mW 14-Pin PDIP (derate 10.0mW/°C above +70°C).800mW 14-Pin CERDIP (derate 9.1mW/°C above +70°C).727mW Operating Temperature Ranges ICL765_C_ _/ICL755_BC_ .0°C +70°C ICL765_I_ _/ICL755_BI_ _.-20°C +85°C ICL765_M_ _/ICL755_BM_ _.-55°C +125°C Storage Temperature Range .-65°C +150°C Junction Temperature .+150°C Lead Temperature (soldering, 10s) .+300°C
Note Maxim recommends limiting input current 100µA avoid latchup problems. value typically safe; however, this guaranteed.
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
(Circuit Figure +5V, -5V, +25°C, unless otherwise noted.) PARAMETER Input Offset Voltage Average Temperature Coefficient Input Offset Voltage Input Bias Current Input Offset Current (Note Input Resistance Large-Signal Voltage Gain Output Voltage Swing (Note Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Input Noise Voltage Input Noise Current Unity-Gain Bandwidth Slew Rate Rise Time Overshoot Operating Supply Range Supply Current VISUPP load SYMBOL +25°C IBIAS AVOL VOUT CMVR CMRR PSRR enp-p 50pF, CMVR +1.6V 100, 10Hz 10Hz 100k ±4.7 -55°C +85°C -55°C +125°C +25°C -20°C +85°C +25°C Doubles every +25°C +70°C -20°C +85°C 0.01 1012 ±4.85 µVp-p pA/Hz V/µs 0.05 CONDITIONS ±0.7 µV/°C UNITS
±4.95 -5.0 -5.2 +2.0 0.01
(Circuit Figure +5V, -5V, +25°C, unless otherwise noted.) PARAMETER Internal Chopping Frequency Clamp Current (Note Clamp Current (Note Offset Voltage Time SYMBOL CONDITIONS Pins 12-14 open (DIP) 100k -4.0V VOUT +4.0V load UNITS month
Note IBIAS Note OUTPUT CLAMP pins connected. Note Output Clamp section details.
(Circuit Figure +5V, -5V, +25°C, unless otherwise noted.) (Note PARAMETER SYMBOL +25°C Input Offset Voltage ICL765_ (Note CONDITIONS ICL765_ ICL765_B +70°C -20°C +85°C -55°C +125°C +70°C ICL765_ -20°C +85°C -55°C +85°C +85°C +125°C +25°C Input Bias Current ICL765_ Input Resistance 10k, +25°C Large-Signal Voltage Gain AVOL +70°C -20°C +85°C -55°C +125°C Output Voltage Swing (Note VOUT 100k +70°C Common-Mode Voltage Range CMVR -20°C +85°C -55°C +125°C ±4.7 ±4.85 ±4.95 -5.0 -5.2 +3.0 -5.0 -5.2 +3.0 -4.5 -4.0 +3.0 ICL765_ ICL765_B +70°C -20°C +85°C -55°C +125°C ±0.7 ±1.0 ±1.0 ±1.0 0.01 0.01 0.01 0.01 0.25 1012 ±5.0 0.05 0.05 0.05 µV/°C UNITS
ICL765_B, +70°C Average Temperature Coefficient Input Offset Voltage (Note
ELECTRICAL CHARACTERISTICS-ICL7650/ICL7653 (continued)
(Circuit Figure +5V, -5V, +25°C, unless otherwise noted.) (Note PARAMETER Common-Mode Rejection Ratio Power-Supply Rejection Ratio Input Noise Voltage Input Noise Current Unity-Gain Bandwidth Slew Rate Rise Time Overshoot Operating Supply Range Supply Current Internal Chopping Frequency Clamp Current (Note Clamp Current (Note Offset Voltage Time VISUPP fCLKOUT load Pins open (DIP) 100k -4.0 VOUT +4.0V SYMBOL CMRR PSRR enp-p 50pF, CONDITIONS CMVR +2.5V 100, 10Hz 10Hz 0.01 UNITS µVp-p pA/Hz V/µs month
Note OUTPUT CLAMP pins connected. Note Output Clamp section details. Note pins designed withstand electrostatic discharge (ESD) levels excess 2000V (MIL 8838 Method 3015.1 test circuit). Note Sample tested. Limits used calculate outgoing quality level.
Typical Operating Characteristics
(Circuit Figure +5V, -5V, +25°C, unless otherwise noted.)
MAXIMUM OUTPUT CURRENT SUPPLY VOLTAGE
CLOCK RIPPLE REFERRED INPUT TEMPERATURE
SUPPLY CURRENT SUPPLY VOLTAGE
MAXIMUM OUTPUT CURRENT (mA) SINK CURRENT SOURCE CURRENT
0.1µF CLOCK RIPPLE (µVp-p) BROADBAND NOISE 1000)
SUPPLY CURRENT (mA)
TOTAL SUPPLY VOLTAGE TEMPERATURE (°C)
TOTAL SUPPLY VOLTAGE
Typical Operating Characteristics (continued)
(Circuit Figure +5V, -5V, +25°C, unless otherwise noted.)
SUPPLY CURRENT AMBIENT TEMPERATURE
COMMON-MODE INPUT VOLTAGE RANGE SUPPLY VOLTAGE
COMMON-MODE INPUT VOLTAGE RANGE
NEGATIVE LIMIT POSITIVE LIMIT
INPUT OFFSET VOLTAGE CHOPPING FREQUENCY
SUPPLY CURRENT (mA)
OFFSET VOLTAGE (µV)
AMBIENT TEMPERATURE (°C)
CHOPPING FREQUENCY (CLOCK OUT) (Hz)
INPUT OFFSET VOLTAGE CHANGE SUPPLY VOLTAGE
10Hzp-p NOISE VOLTAGE CHOPPING FREQUENCY
10Hz NOISE VOLTAGE (µV)
OPEN-LOOP GAIN PHASE SHIFT FREQUENCY
CEXT 0.1µF 0.01 100k PHASE SHIFT (DEGREES) OPEN-LOOP GAIN (dB)
INPUT OFFSET VOLTAGE CHANGE (µV)
TOTAL SUPPLY VOLTAGE CHOPPING FREQUENCY (CLOCK-OUT) (Hz)
OPEN-LOOP GAIN PHASE SHIFT FREQUENCY
PHASE SHIFT (DEGREES) OUTPUT VOLTAGE OPEN-LOOP GAIN (dB) 0.01 100k FREQUENCY (Hz) CEXT 1.0µF
VOLTAGE FOLLOWER LARGE-SIGNAL PULSE RESPONSE
VOLTAGE FOLLOWER LARGE-SIGNAL PULSE RESPONSE
CLOCK CLOCK HIGH
OUTPUT VOLTAGE CLOCK HIGH
ICL7650 INT/EXT OUTPUT
ICL7650 ICL7653 0.1µF 0.1µF
INTERNAL BIAS MAIN NULL CEXTA CEXTB
Figure ICL7650 Test Circuit
Figure shows major elements ICL7650/ ICL7653. amplifiers illustrated, main amplifier nulling amplifier, both which have offsetnull capability. main amplifier connected full time from input output. nulling amplifier, under control chopper-frequency oscillator clock circuit, alternately nulls itself main amplifier. This nulling arrangement, which independent output level, operates over full power-supply commonmode ranges. ICL7650/ICL7653 exhibit exceptionally high CMRR, PSRR, Their nulling connections, which MOSFET back gates, have inherently high impedance. external capacitors provide storage nulling potentials necessary nulling-loop time constants. ICL7650/ICL7653 minimize chopper-frequency charge injection input terminals carefully balancing input switches. Feed-forward injection into compensation capacitor, main cause output spikes this type circuit, also minimized.
Figure Block Diagram
Intermodulation effects cause problems older chopper-stabilized amplifier modules. Intermodulation occurs since amplifier finite gain, therefore will have small signal input. chopper-stabilized module, this small signal detected, chopped, into offset-correction circuit. This results spurious outputs difference frequencies chopping input signal frequencies. Other intermodulation effects chopperstabilized modules include gain phase anomalies near chopping frequency. These effects substantially reduced ICL7650/ICL7653, which nulling circuit dynamic current that compensates signal inputs. Unlike modules, ICL7650/ICL7653 precisely compensate finite gain, since both gain rolloff intermodulation compensation current controlled internal matched capacitors.
Output Clamp (ICL7650 Only)
output clamp reduces overload recovery time inherent with chopper-stabilized amplifiers. When tied summing junction inverting input pin, current path between this point output occurs just before output device saturates. This prevents uncontrolled input differential consequent charge build-up correction-storage capacitors, while causing only slight reduction output swing.
Nulling Capacitor Connection
Separate pins provided CRETN CLAMP ICL7650. need clamp feature, order ICL7653; this device only offers CRETN will produce slightly lower noise improved common-mode rejection. need clamp feature, order ICL7650 connect external capacitors prevent load-current drops other extraneous signals from being injected into capacitors, separate board trace connect capacitor commons directly pin. outside foil capacitors should connected low-impedance side null storage circuit, CRETN. This will voltage shield. leakage null capacitor pins) becomes excessive external capacitors required.
Output Stage/Load Driving
ICL7650/ICL7653 somewhat resemble transconductance amplifier whose open-loop gain proportional load resistance. This behavior apparent when loads less than high-impedance stage (approximately output circuit). open-loop gain, example, will 17dB lower with load than with load. This lower gain little consequence amplifier used strictly since gain typically greater than 120dB, even with load. wideband applications, however, best frequency response will achieved with load resistor higher. result will smooth octave response from 0.1Hz 2MHz, with phase shifts less than transition region where main amplifier takes over from null amplifier.
ICL7650's internal oscillator generates 200Hz frequency, which available pin. device also operated with external clock, desired. internal pull-up permits INT/EXT left open normal operation. However, internal clock must disabled INT/EXT must tied external clock used. external clock signal then applied pin. duty cycle external clock critical frequencies. However, positive duty cycle preferred frequencies above 500Hz, since capacitors charged only when high. This ensures that transients have time settle before capacitors turned off. external clock should swing between ground power supplies ±6V, between higher supply voltages. avoid capacitor imbalance during overload, strobe signal. Neither capacitor will charged strobe signal connected that while overload signal being applied amplifier. typical amplifier will drift less than 10µVs since leakage capacitor pins quite room temperature. Relatively long measurements made with little change offset.
CEXTA CEXTB, required capacitors, have optimum values depending clock chopping frequency. correct value 0.1µF preset internal clock. When using external clock, scale this component value proportion relationship between chopping frequency nulling time constant. low-leakage ceramic capacitor prove suitable many applications; however, high-quality film-type capacitor (such mylar) preferred. lowest settling time initial turn-on, capacitors with dielectric absorption (such polypropylene types). With low-dielectric-absorption capacitors, ICL7650/ICL7653 will settle offset 100ms, several seconds required ceramic capacitors used.
Thermoelectric effects developed thermocouple junctions dissimilar materials (metals, alloys, silicon, etc.) ultimately limit precision measurements. Unless junctions same temperature, thermoelectric voltages (typically around 10µV/°C, hundreds µV/°C some materials) will generated. order realize extremely offset voltages that chopper amplifier provide, take special precautions avoid temperature gradients. eliminate movement, enclose components (particularly those caused power-dissipating elements system). Minimize power-supply voltages power dissipation, low-thermoelectric-coefficient connections where possible. advisable separate device surrounding heat-dissipating elements, high-impedance loads.
applications that require lowest noise, Maxim's ICL7652 preferred over ICL7650/ICL7653. ICL7650/ICL7653 offer higher gain-bandwidth product lower input bias currents, while ICL7652 reduces noise using larger input FETs. These larger FETs, however, increase leakage ICL7652's external null pins. Therefore, ICL7650/ICL7653 operate higher temperature with 0.1µF capacitors before clock ripple (due
Low-leakage, high-impedance CMOS inputs allow ICL7650/ICL7653 measure high-impedance sources. Stray leakage paths decrease input resistance increase input currents unless inputs guarded. Boards must thoroughly cleaned with alcohol blown with compressed air. board should coated with epoxy silicone after cleaning prevent contamination. Leakage currents cause trouble even with properly cleaned coated boards, particularly since input pins adjacent pins that supply potentials. Leakage significantly reduced using guarding decrease voltage difference between inputs adjacent metal runs. 10-lead circle, with leads device formed that holes adjacent inputs empty when inserted board accomplish input guarding 8-pin TO-99 package. conductive ring surrounding inputs, "guard," connected low-impedance point that approximately same voltage inputs. guard then absorbs leakage current from highvoltage pins. Typical guard connections shown Figure
OUTPUT INPUT OUTPUT
INVERTING AMPLIFIER COMPENSATE LARGE SOURCE RESISTANCES, CLAMP OPERATION (FIGURE
EXTERNAL CAPACITORS OUTPUT OUTPUT EXTERNAL CAPACITORS INPUT VGUARD
NONINVERTING AMPLIFIER NOTE: SHOULD IMPEDANCE OPTIMUM GUARDING.
BOTTOM VIEW BOARD LAYOUT INPUT GUARDING WITH TO-99 PACKAGE.
Figure Input Guard Connection
14-pin configuration been specifically designed ease input guarding. pins adjacent inputs used. amplifier's inverting input, integrate error, drive amplifier's noninverting input correct offset voltage detected inverting input. circuit's offset characteristics determined ICL7650/ICL7653, performance determined high-speed amplifier. While this circuit continuously automatically adjusts amplifier's offset less than 5µV, does correct errors caused input bias current, value resistor should practical. This technique used with that configured inverting amplifier. Figures illustrate basic inverting noninverting amplifier circuits. Both figures show output clamping circuit being used enhance overload recovery performance. Supply voltage (±8V max) output drive capability (10k load full swing) only limitations consider when replacing other amps with ICL7650/ICL7653. simple booster circuit overcome these limitations (Figure This enables full output capabilities LM118 other standard device) combined with input capabilities ICL7650/ICL7653. Observe loop gain stability carefully when feedback network added, particularly when slower amplifier such LM741 used. lower voltage supply required when mixing ICL7650/ICL7653 with circuits that operate ±15V supplies. approach highly efficient voltage divider. This illustrated Figure where ICL7660 voltage converter used convert +15V +7.5V.
ICL7653's pinout generally corresponds that industry-standard 8-pin devices such LM741 LM101. However, external null storage capacitors connected pins whereas most amps leave these pins open them offset null compensation capacitors. OP05 OP07 amps converted ICL7650/ICL7653 operation. This accomplished removing offset null potentiometer, which connected from pins replacing with capacitors connected from pins LM108 devices, compensation capacitor replaced external nulling capacitors. output clamp connection ICL7650/ICL7653. removing circuit connections from this pin, LM101/LM748/LM709 devices undergo similar conversion.
Figure shows ICL7650/ICL7653 automatically nulling offset voltage high-speed amplifier. ICL7650/ICL7653 continuously monitor voltage
HIGHSPEED VOUT CLAMP
OUTPUT 100k 0.1µF ICL7650 NOTE: INDICATES PARALLEL COMBINATION 100k FULL CLAMP EFFECT
Figure Inverting Amplifier with Optional Clamp
Figure Nulling High-Speed Amplifier
0.1µF 0.1µF CLAMP INPUT ICL7650 CLAMP 100k FULL CLAMP EFFECT NOTE: INDICATES PARALLEL COMBINATION -7.5V OUTPUT
+7.5V +15V ICL7650 -15V
Figure Using Industry-Standard Boost Output Drive Capability
Figure Noninverting Amplifier with Optional Clamp
INT/EXT +15V +7.5V 10µF 0.090" (2.29mm) OUTPUT CEXTA CEXTB EXT/CLK INT/
Figure Splitting +15V with ICL7660, Efficiency (Same -15V)
-INPUT +INPUT VCRETN 0.069" (1.75mm) CLAMP
CEXTB CEXTA N.C. (GUARD)
INT/EXT EXT/CLK INT/CLK CEXTA -INPUT CEXTB -INPUT OUTPUT CLAMP +INPUT VCEXTA
-INPUT +INPUT N.C. (GUARD)
OUTPUT CLAMP CRETN +INPUT
N.C. INTERNAL CONNECTION CEXTB CEXTA CEXTA -INPUT CEXTB -INPUT OUTPUT CRETN +INPUT CRETN
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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