AD705AQ ,Picoampere Input Current Bipolar Op AmpFEATURESCONNECTION DIAGRAMDC PERFORMANCE25 mV max Offset Voltage (AD705T)Plastic Mini-DIP (N)0.6 mV ..
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AD705JR ,Picoampere Input Current Bipolar Op AmpSpecifications subject to change without notice.1ABSOLUTE MAXIMUM RATINGSMETALIZATION PHOTOGRAPHSup ..
AD705KN ,Picoampere Input Current Bipolar Op AmpAPPLICATIONSThe AD705 is internally compensated for unity gain and isLow Frequency Active Filtersav ..
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ADC12048CIV/NOPB ,12-Bit Plus Sign 216 kHz 8 Channel Sampling Analog to Digital Converter 44-PLCC -40 to 85FEATURES DESCRIPTIONOperating from a single 5V power supply, the2• 8-Channel Programmable Different ..
ADC12048CIVF ,12-Bit Plus Sign 216 kHz 8 Channel Sampling Analog to Digital Converter
ADC12048CIVF/NOPB ,12-Bit Plus Sign 216 kHz 8 Channel Sampling Analog to Digital Converter 44-QFP -40 to 85 SNAS105B –APRIL 2000–REVISED MARCH 2013PIN DESCRIPTIONPLCC Pkg. PQFP Pkg.Pin Name DescriptionPin N ..
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ADC1205CCJ ,12-Bit Plus Sign mP Compatible A/D Converters
AD705-AD705AQ-AD705JN-AD705JR-AD705KN-AD705TQ
Picoampere Input Current Bipolar Op Amp
REV.B
Picoampere Input Current
Bipolar Op Amp
FEATURES
DC PERFORMANCE
25 mV max Offset Voltage (AD705T)
0.6 mV/8C max Drift (AD705K/T)
100 pA max Input Bias Current (AD705K)
600 pA max IB Over MIL Temperature Range (AD705T)
114 dB min CMRR (AD705K/T)
114 dB min PSRR (AD705T)
200 V/mV min Open Loop Gain
0.5 mV p-p typ Noise, 0.1 Hz to 10 Hz
600 mA max Supply Current
AC PERFORMANCE
0.15 V/μs Slew Rate
800 kHz Unity Gain Crossover Frequency
10,000 pF Capacitive Load Drive Capability
Low Cost
Available in 8-Pin Plastic Mini-DlP, Hermetic Cerdip
and Surface Mount (SOIC) Packages
MIL-STD-883B Processing Available
Dual Version Available: AD706
Quad Version: AD704
APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
CONNECTION DIAGRAM
Plastic Mini-DIP (N)
Cerdip (Q) and
Plastic SOIC (R) Packages
PRODUCT DESCRIPTIONThe AD705 is a low power bipolar op amp that has the low in-
put bias current of a BiFET amplifier but which offers a signifi-
cantly lower IB drift over temperature. The AD705 offers many
of the advantages of BiFET and bipolar op amps without their
inherent disadvantages. It utilizes superbeta bipolar input tran-
sistors to achieve the picoampere input bias current levels of
FET input amplifiers (at room temperature), while its IB typi-
cally only increases 5 times vs. BiFET amplifiers which exhibit a
1000X increase over temperature. This means that, at room
temperature, while a typical BiFET may have less IB than the
AD705, the BiFET’s input current will increase to a level of
several nA at +125°C. Superbeta bipolar technology also per-
mits the AD705 to achieve the microvolt offset voltage and low
noise characteristics of a precision bipolar input amplifier.
The AD705 is a high quality replacement for the industry-
standard OP07 amplifier while drawing only one sixth of its
power supply current. Since it has only 1/20th the input bias
current of an OP07, the AD705 can be used with much higher
source impedances, while providing the same level of dc preci-
sion. In addition, since the input bias currents are at picoAmp
levels, the commonly used “balancing” resistor (connected be-
tween the noninverting input of a bipolar op amp and ground) is
not required.
The AD705 is an excellent choice for use in low frequency ac-
tive filters in 12- and 14-bit data acquisition systems, in preci-
sion instrumentation and as a high quality integrator.
The AD705 is internally compensated for unity gain and is
available in five performance grades. The AD705J and AD705K
are rated over the commercial temperature range of 0°C to
+70°C. The AD705A and AD705B are rated over the industrial
temperature range of –40°C to +85°C. The AD705T is rated
over the military temperature range of –55°C to +125°C and is
available processed to MIL-STD-883B, Rev. C.
The AD705 is offered in three varieties of 8-pin package: plastic
DIP, hermetic cerdip and surface mount (SOIC). “J” grade
chips are also available.
PRODUCT HIGHLIGHTSThe AD705 is a low drift op amp that offers BiFET level
input bias currents, yet has the low IB drift of a bipolar ampli-
fier. It upgrades the performance of circuits using op amps
such as the LT1012.The combination of Analog Devices’ advanced superbeta
processing technology and factory trimming provides both
low drift and high dc precision.The AD705 can be used in applications where a chopper am-
plifier would normally be required but without the chopper’s
inherent noise and other problems.
AD705–SPECIFICATIONSINPUT BIAS CURRENT
INPUT VOLTAGE RANGE
POWER SUPPLY
TEMPERATURE RANGE
(@ TA = +258C, VCM = 0 V, and VS = 615 V dc, unless otherwise noted)
NOTESBias current specifications are guaranteed maximum at either input.
All min and max specifications are guaranteed
Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels.
Specifications subject to change without notice.
AD705
METALIZATION PHOTOGRAPHDimensions shown in inches and (mm).
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation2 . . . . . . . . . . . . . . . . . . . 650 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±VS
Differential Input Voltage3 . . . . . . . . . . . . . . . . . . . . . ±0.7 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C
Storage Temperature Range (Q) . . . . . . . . . –65°C to +150°C
Operating Temperature Range
AD705J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD705A/B . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
AD705T . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
NOTES
1Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in
the operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2Specification is for device in free air:
8-Pin Plastic Package:θJA = 165°C/Watt
8-Pin Cerdip Package:θJA = 110°C/Watt
8-Pin Small Outline Package:θJA = 155°C/Watt
3The input pins of these amplifiers are protected by back-to-back diodes. If the
differential voltage exceeds ±0.7 V, external series protection resistors should be
added to limit the input current to less than 25 mA.
ORDERING GUIDE
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD705 features proprietary ESD protection circuitry, permanent damage may
+IN
AD705–Typical Characteristics(@ +258C, VS = 615 V, unless otherwise noted)
INPUT OFFSET VOLTAGE – Microvolts–20–20+40+80––60+60+80
NUMBER OF UNITS Figure 1.Typical Distribution of
Input Offset Voltage
INPUT COMMON MODE VOLTAGE LIMIT – Volts
(REFERRED TO SUPPLY VOLTAGES)
+VS
+1.5
+1.0
+0.5
–VS5101520
SUPPLY VOLTAGE – ±Volts Figure 4.Input Common-Mode
Voltage Range vs. Supply Voltage
NUMBER OF UNITS
–0.4–0.20+0.2+0.4
OFFSET VOLTAGE DRIFT – µV/°C
Figure 7.Typical Distribution of
Offset Voltage Drift
INPUT BIAS CURRENT – Picoamperes
–120–60+60+120
NUMBER OF UNITS Figure 2.Typical Distribution of
Input Bias Current
10k100k1M
FREQUENCY – Hz
OUTPUT VOLTAGE – Volts p-pFigure 5.Large Signal Frequency
Response
2345
WARM-UP TIME IN MINUTES
CHANGE IN OFFSET VOLTAGE – µV Figure 8.Change in Input Offset
Voltage vs. Warm-Up Time
Figure 3.Typical Distribution of
Input Offset Current
Figure 6.Offset Voltage Drift vs.
Source Resistance
Figure 9.Input Bias Current vs.
Common-Mode Voltage
VOLTAGE NOISE – nV/101001000
FREQUENCY – Hz Figure 10.Input Noise Voltage
Spectral Density
5101520
SUPPLY VOLTAGE – ±Volts
QUIESCENT CURRENT – µA Figure 13.Quiescent Supply
Current vs. Supply Voltage
1010020
100k
10M
LOAD RESISTANCE – kΩ64060
OPEN LOOP VOLTAGE GAIN Figure 16.Open Loop Gain vs.
Load Resistance over Temperature
CURRENT NOISE – fA/101001000
FREQUENCY – Hz Figure 11.Input Noise Current
Spectral Density
1001k10k100k1M
FREQUENCY – Hz0.1
CMRR – dB Figure 14.Common-Mode
Rejection vs. Frequency
0.010.11101001k10k100k1M10M
FREQUENCY – Hz
OPEN LOOP VOLTAGE GAIN
PHASE SHIFT – Degrees Figure 17.Open Loop Gain and
Phase Shift vs. Frequency
Figure 12.0.1 Hz to 10 Hz Noise
Voltage
0.11101001k10k100k1M
FREQUENCY – Hz
PSRR – dB Figure 15.Power Supply Rejection
vs. Frequency
Figure 18.Output Voltage Limit vs.
Supply Voltage
AD705
0.110100100010,000
VALUE OF OVERCOMPENSATION CAPACITOR – pF
0.0011k
10k
100k
SLEW RATE – V/µs
GAIN BANDWIDTH PRODUCT – Hz Figure 19.Slew Rate & Gain
Bandwidth Product vs. Value of
Overcompensation Capacitor
Figure 21b.Unity Gain Follower
Large Signal Pulse Response
RF = 10 kΩ, CL = 50 pF
0.1µF–VS
VOUT
VIN
SQUARE WAVE
INPUT
10kΩ Figure 22a.Unity Gain Inverter
101001k10k100k
FREQUENCY – Hz
CLOSED LOOP OUTPUT IMPEDANCE – Figure 20.Magnitude of Closed
Loop Output Impedance vs.
Frequency
Figure 21c.Unity Gain Follower
Small Signal Pulse Response
RF = 0 Ω, CL = 100 pF
Figure 22b.Unity Gain Inverter
Large Signal Pulse Response
CL = 50 pF
0.1µF–VS
VOUT
VIN
SQUARE WAVE
INPUT Figure 21a.Unity Gain Follower
(For Large Signal Applications,
Resistor RF Limits the Current
Through the Input Protection
Diodes)
Figure 21d.Unity Gain Follower
Small Signal Pulse Response
RF = 0 Ω, CL = 1000 pF
Figure 22c.Unity Gain Inverter
Small Signal Pulse Response
CL = 100 pF
