AD8021ARZ ,Low Noise, High Speed Amplifier for 16-Bit SystemsSPECIFICATIONS(@ T = 25C, V = 5 V, R = 1 k, Gain = +2, unless otherwise noted.)A S LV = 5 VSAD80 ..
AD8021ARZ-REEL ,Low Noise, High Speed Amplifier for 16-Bit SystemsSpecifications subject to change without notice.–2– REV. DAD8021(@ T = 25C, R = 1 k, Gain = +2, u ..
AD8021ARZ-REEL7 ,Low Noise, High Speed Amplifier for 16-Bit SystemsFEATURES CONNECTION DIAGRAMLow NoiseSOIC-8 (R-8)2.1 nV/√Hz Input Voltage NoiseMSOP-8 (RM-8)2.1 pA/√ ..
AD8022 ,Dual Low Noise, Low Distortion, High Speed AmplifierSPECIFICATIONS (@ 25C, V = 2.5 V, R = 500 , G = +1, T = –40C, T = +85C, unless otherwise noted ..
AD8022 ,Dual Low Noise, Low Distortion, High Speed AmplifierAPPLICATIONSReceiver for ADSL, VDSL, HDSL, and Proprietary xDSLSystemsLow Noise Instrumentation Fro ..
AD8022AR ,Dual High-Speed Low-Noise Op AmpsSPECIFICATIONSParameter Conditions Min Typ Max UnitDYNAMIC PERFORMANCE–3 dB Small Signal Bandwidth ..
ADM708ARZ , Low Cost Microprocessor Supervisory Circuits
ADM708RAN ,+3 V, Voltage Monitoring uP Supervisory CircuitsFEATURESPrecision Supply-Voltage Monitor+2.63 V (ADM706P/R, ADM708R)WATCHDOGWATCHDOGWATCHDOGWATCHDO ..
ADM708RAR ,+3 V, Voltage Monitoring uP Supervisory CircuitsFEATURESPrecision Supply-Voltage Monitor+2.63 V (ADM706P/R, ADM708R)WATCHDOGWATCHDOGWATCHDOGWATCHDO ..
ADM708RARZ , 3 V, Voltage Monitoring Microprocessor Supervisory Circuits
ADM708RARZ-REEL , 3 V, Voltage Monitoring Microprocessor Supervisory Circuits
ADM708RARZ-REEL , 3 V, Voltage Monitoring Microprocessor Supervisory Circuits
AD8021ARM-REEL-AD8021ARZ-AD8021ARZ-REEL-AD8021ARZ-REEL7
Low Noise, High Speed Amplifier for 16-Bit Systems
REV.D
Low Noise, High Speed Amplifier
for 16-Bit Systems
FEATURES
Low Noise
2.1 nV/√Hz Input Voltage Noise
2.1 pA/√Hz Input Current Noise
Custom Compensation
Constant Bandwidth from G = –1 to G = –10
High Speed
200 MHz (G = –1)
190 MHz (G = –10)
Low Power
34 mW or 6.7 mA Typ for 5 V Supply
Output Disable Feature, 1.3 mA
Low Distortion
–93 dB Second Harmonic, fC = 1 MHz
–108 dB Third Harmonic, fC = 1 MHz
DC Precision
1 mV Max Input Offset Voltage
0.5 �V/�C Input Offset Voltage Drift
Wide Supply Range, 5 V to 24 V
Low Price
Small Packaging
Available in SOIC-8 and MSOP-8
APPLICATIONS
ADC Preamp and Driver
Instrumentation Preamp
Active Filters
Portable Instrumentation
Line Receivers
Precision Instruments
Ultrasound Signal Processing
High Gain Circuits
PRODUCT DESCRIPTIONThe AD8021 is a very high performance, high speed voltage
feedback amplifier that can be used in 16-bit resolution systems.
It is designed to have low voltage and current noise (2.1nV/√Hz
typ and 2.1 pA/√Hz typ) while operating at the lowest quiescent
supply current (7 mA @ ±5 V) among today’s high speed, low
noise op amps. The AD8021 operates over a wide range of
supply voltages from ±2.5 V to ±12 V, as well as from single
5 V supplies, making it ideal for high speed, low power instru-
ments. An output disable pin allows further reduction of the
quiescent supply current to 1.3 mA.
The AD8021 allows the user to choose the gain bandwidth
product that best suits the application. With a single capacitor,
the user can compensate the AD8021 for the desired gain with
little trade-off in bandwidth. The AD8021 is a very well behaved
amplifier that settles to 0.01% in 23 ns for a 1 V step. It has a fast
overload recovery of 50 ns.
The AD8021 is stable over temperature with low input offset
voltage drift and input bias current drift, 0.5 µV/°C and 10 nA/°C,
respectively. The AD8021 is also capable of driving a 75Ω line
with ±3 V video signals.
The AD8021 is not only technically superior, but also priced
considerably less than comparable amps drawing much higher
quiescent current. The AD8021 is a high speed, general-purpose
amplifier, ideal for a wide variety of gain configurations, and can
be used throughout a signal processing chain and in control loops.
The AD8021 is available in both standard 8-lead SOIC and MSOP
packages in the industrial temperature range of –40°C to +85°C.
Figure 1.Small Signal Frequency Response
CONNECTION DIAGRAM
SOIC-8 (R-8)
MSOP-8 (RM-8)
AD8021–SPECIFICATIONS
(@ TA = 25�C, VS = 5 V, RL = 1 k�, Gain = +2, unless otherwise noted.)VS = �5 V
(@ TA = 25�C, RL = 1 k�, Gain = +2, unless otherwise noted.)VS = �12 V
AD8021
(@ TA = 25�C, RL = 1 k�, Gain = +2, unless otherwise noted.)DISABLE CHARACTERISTICS
S = 5 V
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
ABSOLUTE MAXIMUM RATINGS1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.4 V
Power Dissipation . . . . . . . . Observed Power Derating Curves
Input Voltage (Common-Mode) . . . . . . . . . . . . . . . ±VS ± 1 V
Differential Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . ±0.8 V
Differential Input Current . . . . . . . . . . . . . . . . . . . . . ±10 mA
Output Short-Circuit Duration
. . . . . . . . . . . . . . . . . . . . . .Observed Power Derating Curves
Storage Temperature . . . . . . . . . . . . . . . . . . –65∞C to +125∞C
Operating Temperature Range . . . . . . . . . . . –40∞C to +85∞C
Lead Temperature Range (Soldering, 10 sec) . . . . . . . . 300∞C
NOTESStresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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.The AD8021 inputs are protected by diodes. Current-limiting resistors are not
used in order to preserve the low noise. If a differential input exceeds ±0.8 V, the
input current should be limited to ±10 mA.
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by the AD8021
is limited by the associated rise in junction temperature. The maxi-
mum safe junction temperature for plastic encapsulated devices
is determined by the glass transition temperature of the plastic,
approximately 150∞C. Temporarily exceeding this limit may cause
a shift in parametric performance due to a change in the stresses
exerted on the die by the package. Exceeding a junction tempera-
ture of 175∞C for an extended period can result in device failure.
While the AD8021 is internally short-circuit protected, this may
not be sufficient to guarantee that the maximum junction tem-
perature (150∞C) is not exceeded under all conditions. To ensure
proper operation, it is necessary to observe the maximum power
derating curves.
PIN CONFIGURATION
Figure 2.Maximum Power Dissipation vs. Temperature*
*Specification is for device in free air:
8-Lead SOIC: �JA = 125∞C/W
8-Lead MSOP: �JA = 145∞C/W
PIN FUNCTION DESCRIPTIONS
Pin No.
4–VS
5CCOMP
6VOUT
7+VS
*When Pin 8 (DISABLE) is about 2 V or more higher than Pin 1 (LOGIC
REFERENCE), the part is enabled. When Pin 8 is brought down to within about
1.5 V ofPin 1, the part is disabled. (See the Specification tables for exact disable and
enable voltage levels.) If the disable feature is not going to be used, Pin 8 can be tied
to +VS or a logic high source, and Pin 1 can be tied to ground or logic low. Alterna-
tively, if Pin 1 and Pin 8 are not connected, the part will be in an enabled state.
ORDERING GUIDE
*Z = Lead Free
AD8021–Typical Performance Characteristics
(TA = 25�C, VS = �5 V, RL = 1 k�, G = +2, RF = RG = 499 �, RS = 49.9 �, RO = 976 �, RD = 53.6 �, CC = 7 pF, CL = 0, CF = 0, VOUT = 2 V p-p,
Freq = 1 MHz, unless otherwise noted.)
TPC 1.Small Signal Frequency Response vs.
Frequency and Gain, VOUT = 50 mV p-p,
Noninverting. See Test Circuit 1.
TPC 2.Small Signal Frequency Response
vs. Frequency and Gain, VOUT = 50 mV p-p,
Inverting. See Test Circuit 1.
TPC 4.Small Signal Frequency Response vs.
Frequency and Supply, VOUT = 50 mV p-p,
Noninverting. See Test Circuit 1.
TPC 5.Small Signal Frequency Response vs.
Frequency and Supply, VOUT = 50 mV p-p,
Inverting. See Test Circuit 3.
TPC 7.Large Signal Frequency Response vs.
Frequency and Load, Noninverting. See Test
Circuit 2.
TPC 8.Frequency Response vs. Frequency,
Temperature and VOUT, Noninverting.
See Test Circuit 1.
TPC 9.Small Signal Frequency Response vs.
Frequency and Capacitive Load, Noninverting,
TPC 10.Small Signal Frequency Response vs.
Frequency and RF, Noninverting, VOUT = 50 mV p-p.
See Test Circuit 1.
TPC 11.Small Signal Frequency Response vs.
Frequency and RS, Noninverting, VOUT = 50 mV p-p.
See Test Circuit 1.
TPC 12.Open-Loop Gain and Phase vs.
AD8021
TPC 13.0.1 dB Flatness vs. Frequency and
Supply, VOUT = 1 V p-p, RL = 150 Ω, Noninverting.
See Test Circuit 2.
TPC 14.Second and Third Harmonic Distortion
vs. Frequency and RL
TPC 15.Second and Third Harmonic Distortion
TPC 16.Intermodulation Distortion vs. Frequency
TPC 17.Third-Order Intercept vs. Frequency and
Supply Voltage
TPC 18.Second and Third Harmonic Distortion
TPC 19.Second and Third Harmonic Distortion
vs. VOUT and Fundamental Frequency (fC), G = +2
TPC 20.Second and Third Harmonic Distortion
vs. VOUT and Fundamental Frequency (fC), G = +10
TPC 21.Second and Third Harmonic Distortion
vs. Feedback Resistor (RF)
TPC 22.DC Output Voltage vs. Load. See Test
Circuit 1.
TPC 23.Short-Circuit Current to Ground vs.
Temperature
TPC 24.Small Signal Transient Response vs. RL,
VO = 50 mV p-p. See Test Circuit 2, Noninverting.
AD8021
TPC 25.Large Signal Transient Response vs. RL.
See Test Circuit 2, Noninverting.
TPC 26.Large Signal Transient Response.
See Test Circuit 3, Inverting.
TPC 27.Large Signal Transient Response vs. CL.
See Test Circuit 1.
TPC 28.Large Signal Transient Response vs. VS.
See Test Circuit 1.
TPC 29.Overdrive Recovery vs. RL. See Test Circuit 2.
TPC 30.0.01% Settling Time, 2 V Step
