ad8138-ep Analog Devices, Inc., ad8138-ep Datasheet

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ad8138-ep

Manufacturer Part Number
ad8138-ep
Description
Low Distortion Differential Adc Driver Ad8138-ep
Manufacturer
Analog Devices, Inc.
Datasheet
FEATURES
Adjustable output common-mode voltage
Low harmonic distortion
Fast settling to 0.01% of 16 ns
Fast overdrive recovery of 4 ns
Low input voltage noise of 5 nV/√Hz
Low power 90 mW on 5 V
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC)
Extended temperature range −55ºC to +105°C
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The AD8138-EP is a major advancement over op amps for
differential signal processing. The AD8138-EP can be used
as a single-ended-to-differential amplifier or as a differential-to-
differential amplifier. The AD8138-EP is as easy to use as an op
amp and greatly simplifies differential signal amplification and
driving. Manufactured on Analog Devices, Inc., proprietary XFCB
bipolar process, the AD8138-EP has a −3 dB bandwidth of 320 MHz
and delivers a differential signal with the lowest harmonic distortion
available in a differential amplifier. The AD8138-EP has a unique
internal feedback feature that provides balanced output gain and
phase matching, suppressing even order harmonics. The internal
feedback circuit also minimizes any gain error that would be
associated with the mismatches in the external gain setting resistors.
Rev. 0
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. Specifications subject to change without notice. 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 owners.
−94 dBc SFDR @ 5 MHz
−85 dBc SFDR @ 20 MHz
−3 dB bandwidth of 320 MHz, G = +1
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
V
The AD8138-EP’s differential output helps balance the input to
the differential ADCs, maximizing the performance of the ADC.
The AD8138-EP eliminates the need for a transformer with
high performance ADCs, preserving the low frequency and dc
information. The common-mode level of the differential output
is adjustable by a voltage on the V
the input signals for driving single-supply ADCs. Fast overload
recovery preserves sampling accuracy.
The AD8138-EP distortion performance makes it an ideal ADC
driver for communication systems, with distortion performance
good enough to drive state-of-the-art 10-bit to 16-bit converters
at high frequencies. The AD8138-EP’s high bandwidth and IP3 also
make it appropriate for use as a gain block in IF and baseband
signal chains. The AD8138-EP offset and dynamic performance
make it well suited for a wide variety of signal processing and
data acquisition applications. The AD8138-EP is available in the
MSOP package for operation over −55°C to +105°C temperatures.
Full details about this enhanced product are available in the
AD8138
with this data sheet.
IN
499Ω
499Ω
data sheet, which should be consulted in conjunction
V
TYPICAL APPLICATION CIRCUIT
OCM
Differential ADC Driver
AD8138-EP
+
+OUT
V
PIN CONFIGURATION
OCM
5V
–IN
V+
499Ω
499Ω
1
2
3
4
NC = NO CONNECT
©2010 Analog Devices, Inc. All rights reserved.
AD8138-EP
Figure 1.
Figure 2.
Low Distortion
OCM
AIN
AIN
8
7
6
5
pin, easily level-shifting
AD8138-EP
+IN
NC
V–
–OUT
AVSS
AVDD
ADC
5V
DVDD
V
REF
www.analog.com
DIGITAL
OUTPUTS

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ad8138-ep Summary of contents

Page 1

... The AD8138- major advancement over op amps for differential signal processing. The AD8138-EP can be used as a single-ended-to-differential amplifier differential-to- differential amplifier. The AD8138- easy to use amp and greatly simplifies differential signal amplification and driving. Manufactured on Analog Devices, Inc., proprietary XFCB bipolar process, the AD8138-EP has a − ...

Page 2

... AD8138-EP TABLE OF CONTENTS Features .............................................................................................. 1 Enhanced Product Features ............................................................ 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Pin Configuration ............................................................................. 1 Typical Application Circuit ............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 ±D to ±OUT Specifications ...................................................... ±OUT Specifications ..................................................... 4 OCM ±D to ±OUT Specifications ...................................................... 5 IN REVISION HISTORY 4/10—Revision 0: Initial Version   ±OUT Specifications ......................................................6 OCM   ...

Page 3

... IN MIN MAX Maximum ΔV ; single-ended output OUT ΔV /ΔV ; Δ OUT, cm OUT, dm OUT, dm Figure 4 for more information. Rev Page AD8138-EP Min Typ Max Unit 290 320 MHz 256 MHz 225 MHz 30 MHz 265 MHz 1150 V/μs 16 ...

Page 4

... AD8138- ±OUT SPECIFICATIONS OCM At 25° ± + OCM differential outputs, unless otherwise noted. Table 2. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Slew Rate INPUT VOLTAGE NOISE (RTI) DC PERFORMANCE Input Voltage Range Input Resistance Input Offset Voltage Input Bias Current ...

Page 5

... IN MIN MAX Maximum ∆V ; single-ended output OUT ΔV /ΔV ; Δ OUT, cm OUT, dm OUT, dm Figure 5 for more information. Rev Page AD8138-EP Min Typ Max Unit 280 310 MHz 242 MHz 225 MHz 29 MHz 265 MHz 950 V/μs 16 ...

Page 6

... AD8138- ±OUT SPECIFICATIONS OCM At 25° OCM differential output, unless otherwise noted. Table 4. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Slew Rate INPUT VOLTAGE NOISE (RTI) DC PERFORMANCE Input Voltage Range Input Resistance Input Offset Voltage Input Bias Current ...

Page 7

... Table 6. Package Type 8-Lead MSOP/4-Layer MAXIMUM POWER DISSIPATION The maximum safe power dissipation in the AD8138-EP package is limited by the associated rise in junction temperature (T the die. At approximately 150°C, which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this temperature limit can change the stresses that the package exerts on the die, permanently shifting the parametric performance of the AD8138-EP ...

Page 8

... AD8138-EP MAXIMUM OUTPUT VOLTAGE SWING The maximum output voltage swing must be considered in order for the AD8138-EP to remain current density compliant over the extended temperature range. The maximum output swing is dependent on the load resistance and operating temperatures. Figure 4 shows the maximum output swing over operating temperatures for various loads at ± ...

Page 9

... Negative Output. Note that the voltage V− Negative Supply Voltage Connect. 8 +IN Positive Input Summing Node. AD8138-EP –IN + OCM V+ V– +OUT –OUT CONNECT Figure 6. Pin Configuration is inverted at +OUT inverted at –OUT. IN Rev Page AD8138-EP ...

Page 10

... AD8138-EP OUTLINE DIMENSIONS IDENTIFIER ORDERING GUIDE 1 Model Temperature Range AD8138SRMZ-EP-R7 −55°C to +105° RoHS Compliant Part. 3.20 3.00 2.80 5. 3.20 4.90 3.00 4.65 1 2.80 4 PIN 1 0.65 BSC 0.95 15° MAX 0.85 1.10 MAX 0.75 0.15 0.23 6° 0.40 0.05 0.09 0° 0.25 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 7. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Package Description 8-Lead MSOP, 7" ...

Page 11

... NOTES Rev Page AD8138-EP ...

Page 12

... AD8138-EP NOTES ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08997-0-4/10(0) Rev Page ...

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