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AD8651AR-AD8651ARZ-AD8652-AD8652ARMZ-REEL-AD8652ARZ
50 MHz, Precision, Low Distortion, Low Noise CMOS Amplifiers Preliminary Technical Data
50 MHz, Precision, Low Distortion,
Low Noise CMOS Amplifiers

Rev. B
FEATURES
Bandwidth: 50 MHz @ 5 V
Low Noise: 4.5 nV/√Hz
Offset voltage: 100 µV typ, specified over
entire common-mode range
41 V/µs slew rate
Rail-to-rail input and output swing
Input bias current: 1 pA
Single-supply operation: 2.7 V to 5.5 V
Space-saving MSOP and SOIC packaging

APPLICATIONS
Optical communications
Laser source drivers/controllers
Broadband communications
High speed ADC and DAC
Microwave link interface
Cell phone PA control
Video line driver
Audio
PIN CONFIGURATIONS

OUT
NC = NO CONNECT
AD8651
TOP VIEW
(Not to Scale)

03301-0-001
Figure 1. 8-Lead MSOP (RM-8)
OUT A
–IN A
+IN A
OUT B
–IN B
+IN B
AD8652
TOP VIEW
(Not to Scale)

03301-B
Figure 2. 8-Lead MSOP (RM-8)
–IN
+IN
OUT
NC = NO CONNECT

03301-0-002
Figure 3. 8-Lead SOIC (R-8)
OUT A
–IN A
+IN A
OUT B
–IN B
+IN B

03301-B
Figure 4. 8-Lead SOIC (R-8)
GENERAL DESCRIPTION

The AD8651 is a high precision, low noise, low distortion, rail-
to-rail CMOS operational amplifier that runs from a single-
supply voltage of 2.7 V to 5 V.
The AD8651 is a rail-to-rail input and output amplifier with a
gain bandwidth of 50 MHz and a typical voltage offset of
100 µV across common mode from a 5 V supply. It also features
low noise—4.5 nV/√Hz.
The AD8651 can be used in communications applications, such
as cell phone transmission power control, fiber optic
networking, wireless networking, and video line drivers.
The AD8651 features the newest generation of DigiTrim®
in-package trimming. This new generation measures and
corrects the offset over the entire input common-mode range,
providing less distortion from VOS variation than is typical of
other rail-to-rail amplifiers. Offset voltage and CMRR are both
specified and guaranteed over the entire common-mode range
as well as over the extended industrial temperature range.
The AD8651 is offered in the 8-lead SOIC package and the
8-lead MSOP package. It is specified over the extended indus-
trial temperature range (−40°C to +125°C).
TABLE OF CONTENTS
Electrical Characteristics.................................................................3
Electrical Characteristics.................................................................4
Absolute Maximum Ratings............................................................5
ESD Caution..................................................................................5
Typical Performance Characteristics.............................................6
Applications.....................................................................................14
Theory of Operation..................................................................14
Rail-to-Rail Output Stage......................................................14
Rail-to-Rail Input Stage.........................................................14
Input Protection.....................................................................15
Overdrive Recovery...............................................................15
Layout, Grounding, and Bypassing considerations...............15
Power Supply Bypassing........................................................15
Grounding...............................................................................15
Leakage Currents....................................................................15
Input Capacitance..................................................................15
Output Capacitance...............................................................16
Settling Time...........................................................................16
THD Readings vs. Common-Mode Voltage......................16
Driving a 16-Bit ADC............................................................17
Outline Dimensions.......................................................................18
Ordering Guide..........................................................................18
REVISION HISTORY
9/04—Data Sheet Changed from Rev. A to Rev. B

Added AD8652....................................................................Universal
Change to General Description.......................................................1
Changes to Electrical Characteristics.............................................3
Changes to Absolute Maximum Ratings........................................5
Change to Figure 23..........................................................................9
Change to Figure 26..........................................................................9
Change to Figure 36........................................................................11
Change to Figure 42........................................................................12
Change to Figure 49........................................................................13
Change to Figure 51........................................................................13
Inserted Figure 52............................................................................13
Change to Theory of Operation section.......................................14
Change to Input Protection section..............................................15
Changes to Ordering Guide...........................................................20
6/04—Changed from REV. 0 to REV. A

Change to Figure 18.............................................................................8
Change to Figure 21.............................................................................9
Change to Figure 29.............................................................................10
Change to Figure 30.............................................................................10
Change to Figure 43.............................................................................12
Change to Figure 44.............................................................................12
Change to Figure 47.............................................................................13
Change to Figure 57.............................................................................17
ELECTRICAL CHARACTERISTICS
Table 1. V+ = 2.7 V, V– = 0 V, VCM = V+/2, TA = 25°C, unless otherwise specified
ELECTRICAL CHARACTERISTICS
Table 2. V+ = 5 V, V– = 0 V, VCM = V+/2, TA = 25°C, unless otherwise specified
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings apply at 25°C, unless otherwise noted.
Table 3.

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; 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.
Table 4.


1 θJA is specified for the worst-case conditions, i.e., θJA is specified for device
soldered in circuit board for surface-mount packages.
ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
TYPICAL PERFORMANCE CHARACTERISTICS
VOS (µV)
NUMBE
R OF AMP
IFIE
120160200

03301-B
Figure 5. Input Offset Voltage Distribution
TEMPERATURE (°C)
–50050100150

03301-B
Figure 6. Input Offset Voltage vs. Temperature
NUMBE
R OF AMP
IFIE
TCVOS (µV/°C)234567891011

03301-B
Figure 7. TCVOS Distribution
COMMON-MODE VOLTAGE (V)23456

03301-B
Figure 8. Input Offset Voltage vs. Common-Mode Voltage
INP
T BAIS
CURRE
NT (pA)
TEMPERATURE (°C)40140120100806020

03301-B
Figure 9. Input Bias Current vs. Temperature
CURRE
NT (mA)
SUPPLY VOLTAGE (V)54316

03301-B
Figure 10. Supply Current vs. Supply Voltage
CURRE
NT (mA)
TEMPERATURE (°C)
–50050100150

03301-B
Figure 11. Supply Current vs. Temperature
– V
OUT
(mV
CURRENT LOAD (mA)20406010080

03301-B
Figure 12. Output Voltage to Supply Rail vs. Load Current
OUTPUT SW
ING HIGH (
TEMPERATURE (°C)
–50050100150

03301-B
Figure 13. Output Voltage Swing High vs. Temperature
OUTPUT SW
ING LOW
TEMPERATURE (°C)
–50050100150

03301-B
Figure 14. Output Voltage Swing Low vs. Temperature
CMRR (dB)
FREQUENCY (Hz)1k10M1M100k10k100

03301-B
Figure 15. CMRR vs. Frequency
CMRR (dB)
TEMPERATURE (°C)
–50050100150

03301-B
Figure 16. CMRR vs. Temperature
CMRR (dB)
TEMPERATURE (°C)
–50050100150

03301-B
Figure 17. CMRR vs. Temperature
RR (dB)
FREQUENCY (Hz)101001k10k100k1M10M100M

03301-B
Figure 18. PSRR vs. Frequency
RR (dB)
TEMPERATURE (°C)
–50050100150

03301-B
Figure 19. PSRR vs. Temperature
VOLTA
GE N
ISE D
ITY (

Hz)
FREQUENCY (Hz)1k100k10k100

03301-B
Figure 20. Voltage Noise Density vs. Frequency
CURRE
NT NOIS
DE
ITY
(fA/

Hz)
FREQUENCY (Hz)
1001k100k10k

03301-B
Figure 21. Current Noise Density vs. Frequency
VOLTA
GE (
V/D
IV)
TIME (200µs/DIV)

03301-B
Figure 22. No Phase Reversal
OPEN-
OOP GAIN (
SE (
egrees)
FREQUENCY (Hz)1001k10k100k1M10M100M

03301-B
Figure 23. Open-Loop Gain and Phase vs. Frequency
(dB)
TEMPERATURE (°C)
–50050100150

03301-B
Figure 24. Open-Loop Gain vs. Temperature
OPEN-
OOP GAIN (
OUTPUT VOLTAGE SWING FROM THE RAILS (mV)50100150250200

03301-B
Figure 25. Open-Loop Gain vs. Output Voltage Swing
FREQUENCY (Hz)
CLOSED-
OOP GAIN (–40
50k5M500k50M300M

03301-B
Figure 26. Closed-Loop Gain vs. Frequency
MAX
IMUM O
UT S
ING
(V
FREQUENCY (Hz)
100k100M10M1M

03301-B
Figure 27. Maximum Output Swing vs. Frequency
VOLTA
GE (
V/D
IV)
TIME (100µs/DIV)
03301-B
Figure 28. Large Signal Response
VOLTA
GE (
100mV/D
IV)
TIME (10µs/DIV)
03301-B
Figure 29. Small Signal Response
L SIGN
OVER
OOT (
CAPACITANCE (pF)
0206050403010

03301-B
Figure 30. Small Signal Overshoot vs. Load Capacitance
TIME (200ns/DIV)
–200mV
2.5V

03301-B
Figure 31. Negative Overload Recovery Time
TIME (200ns/DIV)
–2.5V

03301-B
Figure 32. Positive Overload Recovery Time
OUTP
UT IMP
DANCE

FREQUENCY (Hz)100010000010000100

03301-B
Figure 33. Output Impedance vs. Frequency
VOS (µV)
NUMBE
R OF AMP
IFIE
120160200

03301-B
Figure 34. Input Offset Voltage Distribution
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