AD8065 AD8066 Analog Devices, AD8065 AD8066 Datasheet

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AD8065 AD8066

Manufacturer Part Number
AD8065 AD8066
Description
High Performance, 145 MHz Fast FET Op Amps
Manufacturer
Analog Devices
Datasheet
a
GENERAL DESCRIPTION
The AD8065/AD8066 Fast FET amplifiers are voltage feed-
back amplifiers with FET inputs offering very high performance
and ease of use. The AD8065 is a single amplifier and the AD8066
is a dual amplifier. The Fast FET amplifiers in ADI’s propri-
etary XFCB process allow exceptionally low noise operation
(7.0 nV/÷Hz and 0.6 fA/÷Hz) as well as very high input impedance.
With a wide supply voltage range from 5 V to 24 V, the ability to
operate on single supplies, and a bandwidth of 145 MHz, the
AD8065/AD8066 are designed to work in a variety of applications.
For added versatility, the amplifiers also contain rail-to-rail
outputs.
*Protected by U.S. Patent No. 6,262,633
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
FEATURES
FET Input Amplifier
Low Cost
High Speed
Low Noise
Wide Supply Voltage Range
Single-Supply and Rail-to-Rail Output
Low Offset Voltage 1.5 mV Max
High Common-Mode Rejection Ratio
Excellent Distortion Specifications
Low Power
No Phase Reversal
Small Packaging
APPLICATIONS
Instrumentation
Photodiode Preamp
Filters
A/D Driver
Level Shifting
Buffering
1 pA Input Bias Current
145 MHz, –3 dB Bandwidth (G = +1)
180 V/ s Slew Rate (G = +2)
7 nV/ ÷ Hz (f = 10 kHz)
0.6 fA/ ÷ Hz (f = 10 kHz)
5 V to 24 V
SFDR –88 dB @ 1 MHz
6.4 mA/Amplifier Typical Supply Current
SOIC-8, SOT-23-5, and MSOP
–100 dB
Despite being low cost, the amplifiers provide excellent overall
performance. The differential gain and phase errors of 0.02% and
0.02∞, respectively, along with 0.1 dB flatness out to 7 MHz,
make these amplifiers ideal for video applications. Additionally,
they offer a high slew rate of 180 V/ms, excellent distortion
(SFDR –88 dB @ 1 MHz), extremely high common-mode
rejection of –100 dB, and a low input offset voltage of 1.5 mV
max under warmed up conditions. The AD8065/AD8066 operate
using only a 6.4 mA/amplifier typical supply current, while they
are capable of delivering up to 30 mA of load current.
The AD8065/AD8066 are high performance, high speed,
FET input amplifiers available in small packages: SOIC-8, MSOP,
and SOT-23-5. They are rated to work over the industrial tem-
perature range of –40∞C to +85∞C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
V
OUT1
–IN1
+IN1
–V
S
High Performance, 145 MHz
Figure 1. Small Signal Frequency Response
1
2
3
4
SOIC-8 (R)
24
21
18
15
12
–3
–6
9
6
3
0
0.1
(Top View)
AD8066
G = +10
G = +5
G = +2
G = +1
SOIC-8 (R) and MSOP (RM)
CONNECTION DIAGRAMS
V
8
7
6
5
© 2003 Analog Devices, Inc. All rights reserved.
OUT1
–IN1
+IN1
–V
+V
V
–IN2
+IN2
1
OUT2
S
Fast FET
S
AD8065/AD8066
1
2
3
4
FREQUENCY – MHz
(Top View)
AD8066
10
8
7
6
5
V
OUT
–V
+IN
+V
V
–IN2
+IN2
SOT-23-5 (RT)
S
OUT2
S
V
O
1
2
3
100
= 200mV
(Not to Scale)
TOP VIEW
AD8065
Op Amps
www.analog.com
p-p
1000
5
4
+V
–IN
*
S

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AD8065 AD8066 Summary of contents

Page 1

... No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. High Performance, 145 MHz ...

Page 2

AD8065/AD8066–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth Bandwidth for 0.1 dB Flatness Input Overdrive Recovery Time Output Recovery Time Slew Rate Settling Time to 0.1% NOISE/HARMONIC PERFORMANCE SFDR Third Order Intercept Input Voltage Noise Input Current Noise Differential Gain Error ...

Page 3

SPECIFICATIONS (@ Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth Bandwidth for 0.1 dB Flatness Input Overdrive Recovery Output Overdrive Recovery Slew Rate Settling Time to 0.1% NOISE/HARMONIC PERFORMANCE SFDR Third Order Intercept Input Voltage Noise Input ...

Page 4

AD8065/AD8066–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth Bandwidth for 0.1 dB Flatness Input Overdrive Recovery Time Output Recovery Time Slew Rate Settling Time to 0.1% NOISE/HARMONIC PERFORMANCE SFDR Third Order Intercept Input Voltage Noise Input Current Noise Differential Gain Error ...

Page 5

The still-air thermal properties of the package and PCB ( ambient temperature (T ), and the total power dissipated in the A package (P ) determine the junction temperature of the die. The D junction temperature can be calculated as ...

Page 6

AD8065/AD8066–Typical Performance Characteristics (Default Conditions pF + ...

Page 7

V = 200mV p 25pF 20pF 5pF –3 –6 –9 0 FREQUENCY – MHz TPC 7. Small Signal Frequency Response for ...

Page 8

AD8065/AD8066 – –40 –50 –60 = 150 HD2 R LOAD – HD2 R LOAD –80 –90 –100 –110 –120 0.1 1 FREQUENCY – MHz TPC 13. Harmonic Distortion vs. Frequency for Various Loads (See Test ...

Page 9

50mV/DIV TPC 19. Small Signal Transient Response 5 V Supply (See Test Circuit 11 12V V = 10V p-p OUT p-p OUT p-p OUT 2V/DIV ...

Page 10

AD8065/AD8066 V = 140mV/DIV IN V OUT 2mV/DIV TPC 25. Long-Term Settling Time (See Test Circuit 8) 0 –5 –10 –15 –20 –25 – TEMPERATURE – C TPC 26. Input Bias Current vs. ...

Page 11

V = 12V S – –80 S –90 –100 0.1 1 FREQUENCY – MHz TPC 31. CMRR vs. Frequency (See Test Circuit 5) 0.30 0.25 V – 0.20 0.15 0.10 ...

Page 12

AD8065/AD8066 6. 6.55 S 6.50 6. +5V S 6.40 6.35 6.30 6.25 –40 – TEMPERATURE – C TPC 37. Quiescent Supply Current vs. Temperature for Various Supply Voltages Test Ciruits SOIC Pinout +V ...

Page 13

CC 2.2pF 499 499 V IN 49.9 AD8065 249 –V EE Test Circuit – 4.7 F 0.1 F 24.9 AD8065 NETWORK ANALYZER S22 0.1 F 4.7 F –V EE Test Circuit 4. Output Impedance ...

Page 14

AD8065/AD8066 +V CC 49.9 24.9 AD8065 0.1 F 4.7 F –V EE Test Circuit 7. Positive PSRR +V CC 4.7 F 0.1 F 2.2pF 499 499 AD8065 249 V IN 0.1 F 49.9 4.7 F –V EE Test Circuit 8. ...

Page 15

REV. B 2.2pF 499 499 5V 4.7 F 0.1 F 249 V IN 49.9 1.5V Test Circuit 11. Single Supply –15– AD8065/AD8066 FET PROBE 1k 1.5V ...

Page 16

AD8065/AD8066 THEORY OF OPERATION The AD8065/AD8066 are voltage feedback operational amplifiers that combine a laser-trimmed JFET input stage with Analog Devices’ eXtra Fast Complementary Bipolar process, resulting in an outstanding combination of precision and speed. Supply voltage range is from ...

Page 17

The closed-loop bandwidth is inversely proportional to the noise gain of the op amp circuit model is accurate for noise gains above 2. The actual bandwidth of circuits with noise gains at or below 2 will ...

Page 18

AD8065/AD8066 Input and Output Overload Behavior The AD8065/AD8066 have internal circuitry to guard against phase reversal due to overdriving the input stage. A simplified schematic of the input stage, including the input-protection diodes and antiphase reversal circuitry, is shown in ...

Page 19

The length of the high frequency bypass capacitor leads is most critical. A parasitic inductance in the bypass grounding will work against the low impedance created by the bypass capacitor. Place the ground leads of the bypass capacitors at the ...

Page 20

AD8065/AD8066 IPHOTO V B Input-to-Output Coupling The output signal traces should not be parallel with inputs in order to minimize capacitive coupling between the inputs and output. Wideband Photodiode Preamp Figure 8 shows an I/V converter with an electrical model ...

Page 21

Table I. RMS Noise Contributions of Photodiode Preamp Contributor Amp to f ven 1 ven Amp (f – ven Amp (past Integrating the square of the output voltage noise spectral density ...

Page 22

AD8065/AD8066 High Speed JFET Input Instrumentation Amplifier Figure 10 shows an example of a high speed instrumentation amplifier with high input impedance using the AD8065/AD8066. The dc transfer function is Ê 1 1000 = - Á ...

Page 23

COPLANARITY 5-Lead Plastic Surface Mount Package [SOT-23] (RT-5) Dimensions shown in millimeters 2.90 BSC 5 4 2.80 BSC 1.60 BSC PIN 1 0.95 BSC 1.90 1.30 BSC 1.15 0.90 1.45 MAX 0.15 MAX ...

Page 24

AD8065/AD8066 Revision History Location 2/03—Data Sheet changed from REV REV. B. Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . ...

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