NULL Precision, Micropower Operational Amplifiers OP193/OP293/OP4
|
|
|
Top Searches for this datasheet
FEATURES Operates from +1.7 Supply Current: A/Amplifier Offset Voltage: Outputs Sink Source: Phase Reversal Single Dual Supply Operation High Open-Loop Gain: V/mV Unity-Gain Stable APPLICATIONS Digital Scales Strain Gages Portable Medical Equipment Battery Powered Instrumentation Temperature Transducer Amplifier
NULL
Precision, Micropower Operational Amplifiers OP193/OP293/OP493*
CONFIGURATIONS 8-Lead Suffix)
NULL CONNECT
8-Lead Epoxy Suffix)
OP193
NULL
OP193
NULL
8-Lead Suffix)
8-Lead Epoxy Suffix)
GENERAL DESCRIPTION
OP193 family single-supply operational amplifiers features combination high precision, supply current ability operate voltages. high performance single supply systems input output ranges include ground, outputs swing from negative rail within positive supply. voltage operation OP193 family operate down volts 0.85 volts. combination high accuracy power operation make OP193 family useful battery powered equipment. current drain voltage operation allow continue performing long after other amplifiers have ceased functioning either because battery drain headroom. OP193 family specified single volt through dual volt operation over (-40°C +125°C) temperature range. They available plastic DIPs, plus SOIC surface mount packages.
*Patent pending.
OP293
OP293
14-Lead Epoxy Suffix)
16-Lead Wide Body Suffix)
OP493
OP493
CONNECT
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Analog Devices, Inc., 1996 Technology Way, P.O. 9106, Norwood. 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
ELECTRICAL SPECIFICATIONS
15.0 unless otherwise noted)
Grade +13.5 Grade +13.5 Units V/mV V/mV V/mV V/mV V/mV V/mV V/mV V/mV V/mV µV/°C 0.05 nV/Hz pA/Hz V/ms
Parameter INPUT CHARACTERISTICS Offset Voltage
Symbol
Conditions OP193 OP193, -40°C +125°C OP293 OP293, -40°C +125°C OP493 OP493, -40°C +125°C -40°C +125°C -40°C +125°C -14.9 -14.9 -40°C +125°C VOUT -40°C +85°C -40°C +125°C VOUT -40°C +85°C -40°C +125°C VOUT -40°C +85°C -40°C +125°C Note Note -40°C +125°C -40°C +125°C
Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection
CMRR
-14.9
-14.9
Large Signal Voltage Gain
+14.1 14.2 +14.0 +13.9 14.1 -14.7 -14.6 -14.4 14.2 -14.1 0.05 1.75
Large Signal Voltage Gain
Large Signal Voltage Gain
Long Term Offset Voltage Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage Swing High
VOS/T
+14.1 14.2 +14.0 +13.9 14.1 -14.7 -14.6 -14.4 14.2 -14.1
Output Voltage Swing
Short Circuit Current POWER SUPPLY Power Supply Rejection Ratio
PSRR -40°C +125°C -40°C +125°C, VOUT VOUT p-p,
Supply Current/Amplifier NOISE PERFORMANCE Voltage Noise Density Current Noise Density Voltage Noise DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Channel Separation
NOTES Long term offset voltage guaranteed 1000 hour life test performed three independent lots +125 with LTPD 1.3. Offset voltage drift average -40°C +25°C delta +25°C +125°C delta. Specifications subject change without notice.
REV.
OP193/OP293/OP493 ELECTRICAL SPECIFICATIONS +5.0
unless otherwise noted)
Grade Grade Units V/mV V/mV V/mV V/mV V/mV V/mV µV/°C nV/Hz pA/Hz V/ms
Parameter INPUT CHARACTERISTICS Offset Voltage
Symbol
Conditions OP193 OP193, -40°C +125°C OP293 OP293, -40°C +125°C OP493 OP493, -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C 0.03 VOUT +4.0 -40°C +85°C -40°C +125°C 0.03 VOUT +4.0 -40°C +85°C -40°C +125°C Note Note -40°C +125°C -100 -100 -40°C +125°C Load -40°C +125°C
Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection
CMRR
Large Signal Voltage Gain
+4.1 +4.0 +4.0 1.25
Large Signal Voltage Gain
Long Term Offset Voltage Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage Swing High
VOS/T
+4.1 +4.0 +4.0
Output Voltage Swing
Short Circuit Current POWER SUPPLY Power Supply Rejection Ratio
PSRR -40°C +125°C
Supply Current/Amplifier NOISE PERFORMANCE Voltage Noise Density Current Noise Density Voltage Noise DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product
14.5 0.05
14.5 0.05
NOTES Long term offset voltage guaranteed 1000 hour life test performed three independent lots +125 with LTPD 1.3. Offset voltage drift average -40°C +25°C delta +25°C +125°C delta. Specifications subject change without notice.
REV.
OP193/OP293/OP493 ELECTRICAL SPECIFICATIONS
Parameter INPUT CHARACTERISTICS Offset Voltage Symbol
+3.0 unless otherwise noted)
Conditions OP193 OP193, -40°C +125°C OP293 OP293, -40°C +125°C OP493 OP493, -40°C +125°C -40°C +125°C -40°C +125°C +2.1 2.14 +1.9 1.25 +2.1 2.14 +1.9 Grade Grade Units V/mV V/mV V/mV µV/°C
Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection
Large Signal Voltage Gain
Long Term Offset Voltage Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage Swing High
-40°C +125°C 0.03 VOUT -40°C +85°C -40°C +125°C Note VOS/T Note -40°C +125°C -40°C +125°C
CMRR
Output Voltage Swing
Short Circuit Current POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier Supply Voltage Range NOISE PERFORMANCE Voltage Noise Density Current Noise Density Voltage Noise DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Channel Separation
PSRR VOUT p-p, +1.7 -40°C +125°C -40°C +125°C
14.5 0.05
14.5 0.05
nV/Hz pA/Hz V/ms
NOTES Long term offset voltage guaranteed 1000 hour life test performed three independent lots +125 with LTPD 1.3. Offset voltage drift average -40°C +25°C delta +25°C +125°C delta. Specifications subject change without notice.
REV.
OP193/OP293/OP493 ELECTRICAL SPECIFICATIONS +2.0
unless otherwise noted)
Grade 13.2 0.05 13.2 0.05 Grade Units V/mV V/mV
Parameter INPUT CHARACTERISTICS Offset Voltage
Symbol
Conditions OP193 OP193, -40°C +125°C OP293 OP293, -40°C +125°C OP493 OP493, -40°C +125°C -40°C +125°C -40°C +125°C 0.03 VOUT -40°C +125°C Note +1.7 -40°C +125°C -40°C +125°C
Input Bias Current Input Offset Current Input Voltage Range Large Signal Voltage Gain Long Term Offset Voltage POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier Supply Voltage Range NOISE PERFORMANCE Voltage Noise Density Current Noise Density Voltage Noise DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product
PSRR
nV/Hz pA/Hz V/ms
WAFER TEST LIMITS +5.0
VOUT unless otherwise noted)
Conditions VOUT VOUT Limit Units V/mV
Parameter Offset Voltage Input Bias Current Input Offset Current Input Voltage Range1 Common-Mode Rejection Power Supply Rejection Ratio Large Signal Voltage Gain Output Voltage Swing High Output Voltage Swing Supply Current/Amplifier
Symbol CMRR PSRR
NOTES Electrical tests wafer probe limits shown. variations assembly methods normal yield loss, yield after packaging guaranteed standard product dice. Consult factory negotiate specifications based dice qualifications through sample assembly testing. Guaranteed CMRR test. Specifications subject change without notice.
REV.
OP193/OP293/OP493
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Input Voltage2 Differential Input Voltage2 Output Short-Circuit Duration Indefinite Storage Temperature Range Package -65°C +150°C Operating Temperature Range OP193/OP293/OP493E, -40°C +125°C Junction Temperature Range Package -65°C +150°C Lead Temperature Range (Soldering, sec) +300°C Package Type 8-Pin Plastic 8-Pin SOIC 14-Pin Plastic 16-Pin Units °C/W °C/W °C/W °C/W
ORDERING GUIDE
Model OP193EP OP193ES OP193ES-REEL OP193ES-REEL7 OP193FP OP193FS OP193FS-REEL OP193FS-REEL7 OP193GBC OP293EP OP293ES OP293ES-REEL OP293ES-REEL7 OP293FP OP293FS OP293FS-REEL OP293FS-REEL7 OP293GBC OP493EP OP493ES OP493ES-REEL OP493FP OP493FS OP493FS-REEL OP493GBC Temperature Range -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C +25°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C +25°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C +25°C
Package Description 8-Pin Plastic 8-Pin SOIC 8-Pin SOIC 8-Pin SOIC 8-Pin Plastic 8-Pin SOIC 8-Pin SOIC 8-Pin SOIC DICE 8-Pin Plastic 8-Pin SOIC 8-Pin SOIC 8-Pin SOIC 8-Pin Plastic 8-Pin SOIC 8-Pin SOIC 8-Pin SOIC DICE 14-Pin Plastic 16-Pin 16-Pin 14-Pin Plastic 16-Pin 16-Pin DICE
Package Option SO-8 SO-8 SO-8 SO-8 SO-8 SO-8 SO-8 SO-8 SO-8 SO-8 SO-8 SO-8 N-14 SOL-16 SOL-16 N-14 SOL-16 SOL-16
NOTES Absolute maximum ratings apply both DICE packaged parts, unless otherwise noted. supply voltages less than input voltage limited supply voltage. specified worst case conditions, i.e., specified device socket P-DIP, specified device soldered circuit board SOIC package.
DICE CHARACTERISTICS
OP193 Size 0.070 0.055 Inch, 3,850 Mils Substrate (Die Backside) Connected Transistor Count,
OP493 Size 0.106 0.143 Inch, 15,158 Mils Substrate (Die Backside) Connected Transistor Count,
OP293 Size 0.072 0.110 Inch, 7,920 Mils Substrate (Die Backside) Connected Transistor Count,
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although OP193/OP293/OP493 feature proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
Typical Performance
±15V +25°C PDIPS
0.1V +25°C PDIPS
0.1V -40°C +125°C PDIPS
NUMBER AMPLIFIERS
NUMBER AMPLIFIERS
NUMBER AMPLIFIERS
OFFSET
OFFSET
TCVOS µV/°
Figure OP193 Offset Distribution,
Figure OP193 Offset Distribution,
Figure OP193 TCVOS Distribution,
±15V -40°C +125°C PDIPS
-40°C
-PSRR
+25°C
NUMBER AMPLIFIERS
INPUT BIAS CURRENT
PSRR
+PSRR
+125°C +25°C
TCVOS µV/°
COMMON MODE VOLTAGE Volts
FREQUENCY
Figure OP193 TCVOS Distribution,
Figure Input Bias Current Common-Mode Voltage
Figure PSRR Frequency
+25°C
CMRR
SHORT CIRCUIT CURRENT
±15V
SLEW RATE V/ms
±15V
+ISC ±15V
-ISC
±15V
-ISC
+ISC
FREQUENCY
TEMPERATURE
TEMPERATURE
Figure CMRR Frequency
Figure Slew Rate Temperature
Figure Short Circuit Current Temperature
REV.
OP193/OP293/OP493-Typical Performance Characteristics
INPUT OFFSET CURRENT INPUT BIAS CURRENT
±18V ±15V
SUPPLY CURRENT
-0.5
-0.10
0.1V
-0.15
0.1V
-0.20 ±15V -0.25 TEMPERATURE
TEMPERATURE
TEMPERATURE
Figure Input Offset Current Temperature
Figure Input Bias Current Temperature
Figure Supply Current Temperature
1000
1000
CURRENT NOISE DENSITY
10000
DELTA FROM SUPPLY RAIL
VOLTAGE NOISE DENSITY
+25°C
+25°C
+25°C
1000 DELTA FROM DELTA FROM
FREQUENCY
1000
10000
FREQUENCY
LOAD CURRENT
Figure Voltage Noise Density Frequency
Figure Current Noise Density Frequency
Figure Delta Output Swing from Either Rail Current Load
2500
1000
+25°C
GAIN
VOLTAGE GAIN V/mV
2000
-10V VOUT +10V 1500
VOLTAGE GAIN V/mV
±15V
±15V -10V VOUT +10V
1000
0.03V VOUT
0.03V VOUT
TEMPERATURE
TEMPERATURE
FREQUENCY
100k
Figure Voltage Gain Temperature
Figure Voltage Gain Temperature
Figure Closed-Loop Gain Frequency,
REV.
OP193/OP293/OP493
+25°C ±15V
+25°C 50mV 150mV LOADS
PHASE
OVERSHOOT
GAIN
GAIN
100k
FREQUENCY
1000 CAPACITIVE LOAD
10000
100k FREQUENCY
Figure Closed-Loop Gain Frequency,
±15V PHASE
PHASE Degrees
Figure Small Signal Overshoot Capacitive Load
Figure Open Loop, Gain Phase Frequency
GAIN
GAIN
+INPUT -INPUT OUTPUT STAGE
100k FREQUENCY
OP293, OP493 ONLY
Figure Open Loop, Gain Phase Frequency
FUNCTIONAL DESCRIPTION
OP193 family operational amplifiers single-supply, micropower, precision amplifiers whose input output ranges both include ground. Input offset voltage (VOS) only maximum, while output will deliver load. Supply current only simplified schematic input stage shown Figure Input transistors devices, which permit inputs operate down ground potential. input transistors have resistors series with base terminals protect junctions from over voltage conditions. second stage cascode which buffered emitter follower before driving final gain stage. OP193 includes connections taps input load resistors, which used null input offset voltage, VOS. OP293 OP493 have additional transistors, behavior these transistors discussed Output Phase Reversal section this data sheet. output stage, shown Figure noninverting "totem-pole" configuration. Current sourced load emitter follower while provides current sink capability. When saturates, output pulled within ground without external pull-down resistor. totem-pole output stage will supply minimum external load, even when operating from single power supply. operating emitter follower, offers high impedance load final collector input stage. Base drive derived monitoring Q1's collector current. Transistor REV.
NULLING TERMINALS (OP193 ONLY)
Figure OP193/OP293/OP493 Equivalent Input Circuit
FROM INPUT STAGE
OUTPUT
Figure OP193/OP293/OP493 Equivalent Output Circuit
tracks collector current When keeps off, current source keeps turned off. When driven cutoff (i.e., output must move toward V-), allows turn Q4's collector current then provides base drive output voltage swing Q2's VCE,SAT which about
PHASE Degrees
GAIN
OP193/OP293/OP493
Driving Capacitive Loads
OP193 family amplifiers unconditionally stable with capacitive loads less than However, small signal, unitygain overshoot will improve resistive load added. example, transient overshoot when driving 1000 load. When driving large capacitive loads unity-gain configurations, in-the-loop compensation technique recommended illustrated Figure
Input Overvoltage Protection
LITHIUM SULPHUR DIOXIDE CELL VOLTAGE Volts
previously mentioned, OP193 family amps input stage with protection resistors series with inverting noninverting inputs. high breakdown transistors, coupled with protection resistors, provides large amount input protection from over voltage conditions. inputs therefore taken beyond either supply without damaging amplifier.
Output Phase Reversal-OP193
High performance portable equipment instruments frequently lithium cells because their long shelf life, light weight, high energy density relative older primary cells. Most lithium cells have nominal output voltage noted flat discharge characteristic. supply voltage requirement OP193, combined with flat discharge characteristic lithium cell, indicates that OP193 operated over entire useful life cell. Figure shows typical discharge characteristic lithium cell powering OP193, OP293, OP493, with each amplifier, turn, driving Volts into load.
OP193's input collector-base junction forwardbiased inputs brought more than diode drop (0.7 below ground. When this happens noninverting input, cascode stage turns output goes high. positive input signal below ground, phase reversal prevented clamping input negative supply (i.e., GND) with diode. reverse leakage diode will, course, input bias current amplifier. input bias current critical, 1N914 will less than leakage. However, leakage current will double every 10°C increase ambient temperature. critical applications, collector-base junction 2N3906 transistor will only about additional bias current. limit current through diode under fault conditions, resistor recommended series with input. (The OP193's internal current limiting resistors will protect external diode).
Output Phase Reversal-OP293 OP493
OP493 OP293 OP193
1000 2000 3000 4000 5000 6000 7000 HOURS
Figure Lithium Sulfur Dioxide Cell Discharge Characteristic with OP193 Family Loads
Input Offset Voltage Nulling
OP293 OP493 include lateral transistors protect against phase reversal. input brought more than diode drop (0.7 below ground, combine level shift entire cascode stage, including bias simultaneously. this case will saturate output remains low. OP293 OP493 exhibit output phase reversal inputs below +25°C. phase reversal limit +125°C about inputs driven below these levels, external clamp diode, discussed previous section, should added.
Battery Powered Applications
OP193 provides offset nulling terminals that used adjust OP193's internal VOS. general, operational amplifier terminals should never used adjust system offset voltages. offset null circuit Figure provides about offset adjustment range. resistor placed series with wiper offset null potentiometer, shown Figure reduces offset adjustment range recommended applications requiring high null resolution. Offset nulling does adversely affect TCVOS performance, providing that trimming potentiometer temperature coefficient does exceed ppm/°C.
OP193
OP193 series amps operated minimum supply voltage +1.7 draw only supply current amplifier from supply. many battery-powered circuits, OP193 devices continuously operated thousands hours before requiring battery replacement, thus reducing equipment downtime operating cost.
100k
Figure Offset Nulling Circuit
-10-
REV.
OP193/OP293/OP493
240k 1000pF 1.5M (+2.5V +36V)
OP193
OP193
VOUT (1.23V 25°C)
100k 100k
MAT-01AH
VBE2
Figure High Resolution Offset Nulling Circuit
Micropower False-Ground Generator
VBE1
Some single supply circuits work best when inputs biased above ground, typically supply voltage. these cases false ground created using voltage divider buffered amplifier. such circuit shown Figure This circuit will generate false-ground reference supply voltage, while drawing only about from supply. circuit includes compensation allow bypass capacitor false-ground output. benefit large capacitor that only does false ground present very resistance load, impedance well. OP193 both sink source more than which improves recovery time from transients load current.
+12V 0.022µF 240k
130k OUTPUT ADJUST
Figure Battery Powered Voltage Reference
Single-Supply Current Monitor
OP193
240k
+2.5V
Figure Micropower False-Ground Generator
Battery Powered Voltage Reference
Current monitoring essentially consists amplifying voltage drop across resistor placed series with current measured. difficulty that only small voltage drops tolerated, with precision amps this greatly limits overall resolution. single-supply current monitor Figure resolution capable monitoring current. This range adjusted changing current sense resistor When measuring total system current, necessary include supply current current monitor, which bypasses current sense resistor, final result. This current measured calibrated (together with residual offset) adjustment offset trim potentiometer, This produces deliberate temperature dependent offset. However, supply current OP193 also proportional temperature, effects tend track. Current which also bypasses adjusted gain trim.
circuit Figure battery-powered voltage reference that draws only supply current. this level, alkaline cells power this reference more than months. output voltage 1.23 25°C, drift reference only µV/°C over industrial temperature range. Load regulation µV/mA with line regulation µV/V. Design reference based Brokaw bandgap core technique. Scaling resistors produces unequal currents resulting across creates temperature-proportional voltage (PTAT) which, turn, produces larger temperature-proportional voltage across temperature coefficient cancels (first order) complementary absolute temperature (CTAT) coefficient VBE1. When adjusted 1.23 +25°C, output voltage tempco minimum. Bandgap references have start-up problems. With current OP193 beyond positive input range limit undefined output state. Shorting offset adjust pin) ground forces output high under these circumstances insures reliable startup without significantly degrading OP193's offset drift. REV. -11-
CIRCUIT UNDER TEST ITEST 100k 9.9k
OP193
VOUT 100mV/mA(ITEST)
100k
Figure Single-Supply Current Monitor
OP193/OP293/OP493
Single-Supply Instrumentation Amplifier
Designing true single-supply instrumentation amplifier with zero-input zero-output operation requires special care. traditional configuration, shown Figure depends upon amplifier A1's output being when applied commonmode input voltage error output multiplied gain addition, current flows through resistor A2's output voltage increases. A1's output must remain while sinking current through gain error will result. With maximum output voltage current through only this will still produce appreciable error.
1.98M OP293 1.98M ISINK OP293 VOUT
1.98M OP293 1.98M
VN2222
OP293 VOUT
Figure Improved Single-Supply, VIN, VOUT Instrumentation Amplifier
Low-Power, Temperature 4-20 Transmitter
Figure Conventional Instrumentation Amplifier
simple temperature 4-20 transmitter shown Figure After calibration, this transmitter accurate 0.5°C over -50°C +150°C temperature range. transmitter operates from with supply rejection better than ppm/V. half OP293 used buffer VTEMP pin, while other half regulates output current satisfy current summation noninverting input:
IOUT TEMP
solution this problem pull-down resistor. example, then pull-down resistor must less than However, pull-down resistor appears fixed load when common-mode voltage applied. With common-mode voltage, additional load current will which unacceptable power application. Figure shows better solution. A1's sink current provided pair N-channel transistors, configured current mirror. With values shown, sink current about Thus, with common-mode voltage additional load current limited versus with resistor.
change output current with temperature derivative transfer function:
IOUT TEMP
1N4002 SPAN TRIM +40V
REF-43BZ VOUT VTEMP OP293 VTEMP
OP293 2N1711 100k
100k
VSET ZERO TRIM
RESISTORS 1/4W, UNLESS OTHERWISE NOTED
IOUT
RLOAD
Figure Temperature 4-20 Transmitter
-12-
REV.
OP193/OP293/OP493
From formulas, seen that span trim adjusted before zero trim, trims interactive, which greatly simplifies calibration procedure. Calibration transmitter simple. First, slope output current versus temperature calibrated adjusting span trim, couple iterations required sure slope correct. Once span trim been completed, zero trim made. Remember that adjusting zero trim will affect gain. zero trim known temperature adjusting until output current equals:
VCONTROL 200k 100k 200k TRIANGLE 200k 200k 200k 75nF 200k OP293 200k OP293 SQUARE
IOUT (TAMBIENT TMIN TOPERATING
Table shows values required various temperature ranges.
Table Values Temperature
CD4066
IN/OUT OUT/IN CONT
OUT/IN
CONT
Temp Range +70°C -40°C +85°C -55°C +150°C
IN/OUT
IN/OUT
CONT
OUT/IN
CONT
OUT/IN
Micropower Voltage Controlled Oscillator
IN/OUT
OP293 combination with inexpensive quad CMOS analog switch forms precision Figure This circuit provides triangle square wave outputs draws only from single supply. acts integrator; switches charging current symmetrically yield positive negative ramps. integrator bounded which acts Schmitt trigger with precise hysteresis 1.67 volts, resistors associated CMOS switches. resulting output triangle wave with upper lower levels 3.33 1.67 volts. output square wave with almost rail-to-rail swing. With components shown, frequency operation given equation: fOUT VCONTROL (Volts) Hz/V this easily changed varying circuit operates well
Figure Micropower Voltage Controlled Oscillator
Micropower, Single-Supply Quad Voltage Output 8-Bit
circuit Figure uses DAC8408 CMOS quad 8-bit OP493 form single-supply quad voltage output with supply drain only DAC8408 used voltage switching mode each output resistance independent digital input code. output amplifiers buffers avoid loading DACs. resistors ensure that OP493 outputs will swing within ground, i.e.:
1.23V
REV.
-13-
OP193/OP293/OP493
Single-Supply Micropower Quad Programmable-Gain Amplifier
3.6k AD589 1.23V IOUT1A VREFA DAC8408 100k OP493 VOUTA
combination quad OP493 DAC8408 quad 8-bit CMOS creates quad programmable gain amplifier with quiescent supply drain only (Figure 36). digital code present DAC, which easily microprocessor, determines ratio between fixed feedback resistor resistance that feedback ladder presents feedback loop. gain each amplifier
IOUT2A/2B
VREFB DAC8408 OP493 VOUTB 100k
where equals decimal equivalent 8-bit digital code present DAC. digital code present consists zeros, feedback loop will open causing saturate. resistors placed parallel with feedback loop eliminates this problem with very small reduction gain accuracy. reference biases amplifiers center linear region providing maximum output swing.
IOUT1B
IOUT1C REFC DAC8408 OP493 VOUTC 100k
IOUT2C/2D
REFD DAC8408 OP493 VOUTD 100k
IOUT1D
OP493
DATA PINS 9(LSB)-16(MSB) DIGITAL CONTROL SIGNALS
DAC8408ET
DGND
Figure Micropower Single-Supply Quad VoltageOutput 8-Bit
-14-
REV.
OP193/OP293/OP493
0.1µF VINA RFBA VREFA
IOUT1A DAC8408 IOUT2A/2B RFBB VREFB DAC8408
OP493 VOUTA
0.1µF
OP493 VOUTB
IOUT1B
0.1µF RFBC VREFC IOUT1C DAC8408 IOUT2C/2D RFBD
OP493
VOUTC
0.1µF
VREFD DAC8408
OP493 VOUTD
IOUT1D
DATA PINS 9(LSB)-16(MSB)
OP493
DIGITAL CONTROL SIGNALS DGND
DAC8408ET
+2.5V REFERENCE VOLTAGE
Figure Single-Supply Micropower Quad Programmable-Gain Amplifier
REV.
-15-
OP193/OP293/OP493
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
8-Lead Suffix)
8-Lead Epoxy Suffix)
0.280 (7.11) 0.240 (6.10)
0.1574 (4.00) 0.1497 (3.80)
0.2440 (6.20) 0.2284 (5.80)
0.430 (10.92) 0.348 (8.84)
0.325 (8.25) 0.300 (7.62) 0.060 (1.52) 0.015 (0.38) 0.195 (4.95) 0.115 (2.93)
0.1968 (5.00) 0.1890 (4.80) 0.0098 (0.25) 0.0040 (0.10) 0.0500 (1.27) 0.0688 (1.75) 0.0532 (1.35) 0.0192 (0.49) 0.0138 (0.35)
0.0196 (0.50) 0.0099 (0.25)
0.210 (5.33) 0.160 (4.06) 0.115 (2.93) 0.100 (2.54)
0.0098 (0.25) 0.0075 (0.19)
0.0500 (1.27) 0.0160 (0.41)
0.130 (3.30) SEATING PLANE
0.015 (0.381) 0.008 (0.204)
0.022 (0.558) 0.014 (0.356)
0.070 (1.77) 0.045 (1.15)
14-Lead Epoxy Suffix)
16-Lead Wide Body Suffix)
0.795 (20.19) 0.725 (18.42) 0.210 (5.33) 0.160 (4.06) 0.115 (2.93) 0.022 (0.558) 0.014 (0.356)
0.280 (7.11) 0.240 (6.10) 0.325 (8.25) 0.300 (7.62) 0.060 (1.52) 0.015 (0.38) 0.195 (4.95) 0.115 (2.93)
0.2992 (7.60) 0.2914 (7.40) 0.4193 (10.65) 0.3937 (10.00)
0.130 (3.30) SEATING PLANE
0.015 (0.381) 0.008 (0.204)
0.4133 (10.50) 0.3977 (10.00)
0.1043 (2.65) 0.0926 (2.35)
0.0291 (0.74) 0.0098 (0.25)
0.100 (2.54)
0.070 (1.77) 0.045 (1.15)
0.0118 (0.30) 0.0500 (1.27) 0.0040 (0.10)
0.0192 (0.49) 0.0138 (0.35)
0.0125 (0.32) 0.0091 (0.23)
0.0500 (1.27) 0.0157 (0.40)
-16-
REV.
PRINTED U.S.A.
C1994-18-1/95
Other recent searches
TSMF3700 - TSMF3700 TSMF3700 Datasheet
S9251 - S9251 S9251 Datasheet
GF5352WC - GF5352WC GF5352WC Datasheet
CT102DVB02A - CT102DVB02A CT102DVB02A Datasheet
CT300DVB01A - CT300DVB01A CT300DVB01A Datasheet
BR305 - BR305 BR305 Datasheet
BR310 - BR310 BR310 Datasheet
AP4417GH - AP4417GH AP4417GH Datasheet
AP3503 - AP3503 AP3503 Datasheet
Privacy Policy | Disclaimer
© 2012 Datasheet Archive
