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AD8027 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8027
Beschreibung Rail-to-Rail Input/Output Amplifiers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 27 Seiten
AD8027 Datasheet, Funktion
Data Sheet
Low Distortion, High Speed
Rail-to-Rail Input/Output Amplifiers
AD8027/AD8028
FEATURES
High speed
190 MHz, −3 dB bandwidth (G = +1)
100 V/µs slew rate
Low distortion
120 dBc at 1 MHz SFDR
80 dBc at 5 MHz SFDR
Selectable input crossover threshold
Low noise
4.3 nV/√Hz
1.6 pA/√Hz
Low offset voltage: 900 µV maximum
Low power: 6.5 mA per amplifier supply current
Power-down mode
No phase reversal: VIN > |VS| + 200 mV
Wide supply range: 2.7 V to 12 V
Small packaging: 8-lead SOIC, 6-lead SOT-23, 10-lead MSOP
Qualified for automotive applications (AD8028WARMZ-R7 only)
APPLICATIONS
Filters
ADC drivers
Level shifting
Buffering
Professional video
Low voltage instrumentation
GENERAL DESCRIPTION
The AD8027/AD80281 are high speed amplifiers with rail-to-rail
input and output that operate on low supply voltages and are
optimized for high performance and a wide dynamic signal range.
The AD8027/AD8028 have low noise (4.3 nV/√Hz, 1.6 pA/√Hz)
and low distortion (120 dBc at 1 MHz). In applications that use a
fraction of or use the entire input dynamic range and require
low distortion, the AD8027/AD8028 are ideal choices.
Many rail-to-rail input amplifiers have an input stage that switches
from one differential pair to another as the input signal crosses
a threshold voltage, which causes distortion. The AD8027/AD8028
have a unique feature that allows the user to select the input
crossover threshold voltage through the DISABLE/SELECT pin
(DISABLE/SELECT x in the 10-lead MSOP, hereafter referred
to as DISABLE/SELECT throughout this data sheet). This feature
controls the voltage at which the complementary transistor
input pairs switch. The AD8027/AD8028 also have intrinsically
low crossover distortion.
1 Protected by U.S. patent numbers 6,486,737B1; 6,518,842B1.
Rev. D
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rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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PIN CONNECTION DIAGRAM
DNC 1
–IN 2
+IN 3
–VS 4
AD8027
8 DISABLE/SELECT
7 +VS
6 VOUT
5 DNC
DNC = DO NOT CONNECT. DO NOT
CONNECT TO THIS PIN.
Figure 1. 8-Lead SOIC, AD8027
See the Pin Configurations and Function Descriptions section
for additional pin configurations and information about the pin
functions.
With their wide supply voltage range (2.7 V to 12 V) and wide
bandwidth (190 MHz), the AD8027/AD8028 amplifiers are
designed to work in a variety of applications where speed and
performance are needed on low supply voltages. The high per-
formance of the AD8027/AD8028 is achieved with a quiescent
current of only 6.5 mA (typical) per amplifier. The AD8027/
AD8028 have a shutdown mode that is controlled via
the DISABLE/SELECT pin.
The AD8027/AD8028 are available in 8-lead SOIC, 6-lead SOT-23,
and 10-lead MSOP packages. The AD8028WARMZ-R7 is an
automotive grade version, qualified for automotive applications.
See the Automotive Products section for more details. The
AD8027/AD8028 family is designed to work over the extended
temperature range of −40°C to +125°C.
–20
G = +1
FREQUENCY = 100kHz
–40 RL = 1k
–60
VS = +3V
–80
VS = +5V
VS = ±5V
–100
–120
–140
0
12345678
OUTPUT VOLTAGE (V p-p)
Figure 2. SFDR vs. Output Voltage
9 10
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2003–2015 Analog Devices, Inc. All rights reserved.
Technical Support
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AD8027 Datasheet, Funktion
AD8027/AD8028
Data Sheet
Parameter
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current1
Input Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Impedance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
DISABLE/SELECT PIN
Selection Input Voltage
Crossover Low
Crossover High2
Disable Input Voltage
Disable Switching Speed
Enable Switching Speed
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time
(Rising/Falling Edge)
Output Voltage Swing
Short-Circuit Current
Off Isolation
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Quiescent Current (Disabled)
Power Supply Rejection Ratio
Test Conditions/Comments
DISABLE/SELECT = tristate or open, PNP active
AD8028W only: TMIN to TMAX
DISABLE/SELECT = high NPN active
AD8028W only: TMIN to TMAX
TMIN to TMAX
VCM = 1.5 V, NPN active
TMIN to TMAX
AD8028W only: TMIN to TMAX
VCM = 1.5 V, PNP active
TMIN to TMAX
AD8028W only: TMIN to TMAX
AD8028W only: TMIN to TMAX
VOUT = 1 V to 2 V, AD8028W only: TMIN to TMAX
RL = 1 kΩ
VCM = 0 V to 1.5 V
AD8028W only: TMIN to TMAX
TMIN to TMAX
Tristate < ±20 µA, TMIN to TMAX
TMIN to TMAX
50% of input to <10% of final VOUT
VIN = −4 V to +1 V, G = −1
AD8028W only: TMIN to TMAX
Sinking and sourcing
VIN = 0.2 V p-p, f = 1 MHz, DISABLE/SELECT = low
30% overshoot
AD8028W only: TMIN to TMAX
DISABLE/SELECT = low
AD8028W only: TMIN to TMAX
VS ± 1 V, AD8028W only: TMIN to TMAX
1 No sign or a plus sign indicates current into the pin; a minus sign indicates current out of the pin.
2 It is recommended to float the DISABLE/SELECT pin for crossover high mode.
Min
90
88
78
2.0
0.07 to 4.93
2.7
88
Typ
200
240
2
4
4
−8
−8
±0.1
100
6
2
−0.2 to +3.2
100
1.1 to 1.3
1150
50
55/55
0.03 to 4.97
72
−49
20
6.0
300
100
Max
800
850
900
900
6
6
−11
−11
±0.9
0.4
12
8.0
9
420
420
Unit
µV
µV
µV
µV
µV/°C
µA
µA
µA
µA
µA
µA
µA
dB
pF
V
dB
dB
V
V
V
ns
ns
ns
V
mA
dB
pF
V
mA
mA
µA
µA
dB
Rev. D | Page 6 of 27

6 Page









AD8027 pdf, datenblatt
AD8027/AD8028
4
3
VICM = +VS – 0.3V
DISABLE/SELECT = HIGH
2 VICM = +VS – 0.2V
1 DISABLE/SELECT = HIGH
0
–1 VICM = –VS + 0.2V
DISABLE/SELECT = TRI
–2
–3
–4
–5
VICM = 0V
DISABLE/SELECT = HIGH OR TRI
–6
–7 G = +1
–8 VOUT = 200mV p-p
0.1 1
VICM = –VS + 0.3V
DISABLE/SELECT = TRI
10
FREQUENCY (MHz)
100
1000
Figure 20. Small Signal Frequency Response vs. Frequency for Various Input
Common-Mode Voltages
–10
–20
–30
–40
–50
–60
–70
–80
B TO A
A TO B
–90
–100
–110
–120
–130
–140
0.001
0.01
0.1 1 10
FREQUENCY (MHz)
100 1000
Figure 21. AD8028 Crosstalk, Output to Output (see Figure 59)
110 135
100 GAIN
90
115
80 95
70 PHASE
75
60
50 55
40
35
30
20 15
10
–5
0
–10 –25
10 100 1k 10k 100k 1M 10M 100M 1G
FREQUENCY (Hz)
Figure 22. Open-Loop Gain and Phase vs. Frequency
Data Sheet
100 100
10 10
VOLTAGE
CURRENT
11
10 100 1k 10k 100k 1M 10M 100M 1G
FREQUENCY (Hz)
Figure 23. Voltage and Current Noise vs. Frequency
6.9
G = +2
6.8 RL = 150
6.7
VOUT = 200mV p-p
6.6
6.5
6.4
6.3
6.2
VOUT = 2V p-p
6.1
6.0
5.9
0.1
1 10 100
FREQUENCY (MHz)
Figure 24. 0.1 dB Flatness Frequency Response
1000
–20
G = +1
VOUT = 2V p-p
–40
RL = 1k
SECOND HARMONIC: SOLID LINE
THIRD HARMONIC: DASHED LINE
–60
VS = +3V
–80
–100
VS = +5V
–120
VS = 5V
–140
0.1
1
FREQUENCY (MHz)
10 20
Figure 25. Harmonic Distortion vs. Frequency and Supply Voltage
Rev. D | Page 12 of 27

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