ADA4938-2ACPZ-RL

ADA4938-2ACPZ-RL Datasheet

The ADA4938-1/ADA4938-2 are low noise, ultralow distortion, high speed differential amplifiers. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 27 MHz, or up to 12 bits from dc to 74 MHz. The output common-mode voltage is adjustable over a wide range, allowing the ADA4938-1/ADA4938-2 to match the input of the ADC. The internal common-mode feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products.

Part	Datasheet
ADA4938-2ACPZ-RL	ADA4938-2ACPZ-RL (pdf)

Related Parts	Information
ADA4938-2YCP-EBZ	ADA4938-2YCP-EBZ
ADA4938-1ACPZ-RL	ADA4938-1ACPZ-RL
ADA4938-2ACPZ-R2	ADA4938-2ACPZ-R2
ADA4938-1ACPZ-R2	ADA4938-1ACPZ-R2
ADA4938-1ACPZ-R7	ADA4938-1ACPZ-R7
ADA4938-2ACPZ-R7	ADA4938-2ACPZ-R7

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Data Sheet Extremely low harmonic distortion HD −106 dBc HD2 10 MHz −82 dBc HD2 50 MHz −109 dBc HD3 10 MHz −82 dBc HD3 50 MHz Low input voltage noise High speed −3 dB bandwidth of 1000 MHz, G = +1 Slew rate 4700 V/us dB gain flatness to 150 MHz Fast overdrive recovery of 4 ns 1 mV typical offset voltage Externally adjustable gain Differential-to-differential or single-ended-to-differential operation Adjustable output common-mode voltage Wide supply voltage range +5 V to ±5 V Single or dual amplifier configuration available ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers The ADA4938-1/ADA4938-2 are low noise, ultralow distortion, high speed differential amplifiers. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 27 MHz, or up to 12 bits from dc to 74 MHz. The output common-mode voltage is adjustable over a wide range, allowing the ADA4938-1/ADA4938-2 to match the input of the ADC. The internal common-mode feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products. Full differential and single-ended-to-differential gain configurations are easily realized with the ADA4938-1/ADA4938-2. A simple external feedback network of four resistors determines the closed-loop gain of the amplifier. The ADA4938-1/ADA4938-2 are fabricated using the Analog Devices, Inc., proprietary third generation, high voltage XFCB process, enabling it to achieve very low levels of distortion with an input voltage noise of only The low dc offset and excellent dynamic performance of the ADA4938-1/ADA4938-2 Document Feedback 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. Ultralow Distortion Differential ADC Driver ADA4938-1/ADA4938-2 FUNCTIONAL BLOCK DIAGRAMS ADA4938-1 TOP VIEW 16 15 14 13 1 +IN 2 3 +FB 4 12 PD 11 10 +OUT 9 VOCM 06592-001 +VS 5 +VS 6 +VS 7 +VS 8 Figure ADA4938-1 Functional Block Diagram ADA4938-2 TOP VIEW 24 +IN1 23 22 21 20 PD1 19 1 +FB1 2 +VS1 3 +VS1 4 5 +IN2 6 18 +OUT1 17 VOCM1 16 15 14 PD2 13 7 +FB2 8 +VS2 9 +VS2 10 VOCM2 11 +OUT2 12 06592-202 Figure ADA4938-2 Functional Block Diagram G = +2, VO, dm = 5V p-p G = +2, VO, dm = 3.2V p-p G = +2, VO, dm = 2V p-p G = +2, VO, dm = 1V p-p SFDR dBc 06592-002 FREQUENCY MHz Figure SFDR vs. Frequency and Output Voltage makes them well-suited for a wide variety of data acquisition and signal processing applications. The ADA4938-1 single amplifier is available in a Pb-free, 3 mm x 3 mm, 16-lead LFCSP. The ADA4938-2 dual amplifier is available in a Pb-free, 4 mm x 4 mm, 24-lead LFCSP. The pinouts have been optimized to facilitate layout and minimize distortion. The devices are specified to operate over the extended industrial temperature range of −40°C to +85°C. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Data Sheet Theory of Operation 19 Analyzing an Application Circuit 19 Setting the Closed-Loop Gain 19 Estimating the Output Noise Voltage 19 The Impact of Mismatches in the Feedback Networks 20 Calculating the Input Impedance of an Application Circuit 20 Input Common-Mode Voltage Range in Single-Supply Applications 20 Terminating a Single-Ended Input 21 Setting the Output Common-Mode Voltage 21 Layout, Grounding, and 23 High Performance ADC Driving 24 Outline Dimensions 25 Ordering Guide 25 Added Settling Time Parameter, Table 3 Changes to Linear Output Current Parameter, Table Changes to Figure 5 and Figure Added EP Row to Table 7 and EP Row to Table 8 Changes to Figure 14 Added New Figure 53, Renumbered Sequentially 16 Changes to Table 19 Added Exposed Pad Notation to Outline Dimensions 25 Changes to Ordering Guide 25 0 Initial Version Data Sheet ADA4938-1/ADA4938-2 SPECIFICATIONS DUAL-SUPPLY OPERATION TA = 25°C, +VS = 5 V, −VS = −5 V, VOCM = 0 V, RT = Ω, RG = RF = 200 Ω, G = +1, RL, dm = 1 unless otherwise noted. All specifications refer to single-ended input and differential output, unless otherwise noted. For gains other than G = +1, values for RF and RG are shown in Table ±DIN to ±OUT Performance Table Parameter DYNAMIC PERFORMANCE −3 dB Small Signal Bandwidth for dB Flatness Large Signal Bandwidth Slew Rate Settling Time Overdrive Recovery Time NOISE/HARMONIC PERFORMANCE Second Harmonic Third Harmonic IMD IP3 Input Voltage Noise Figure Input Current Noise Crosstalk ADA4938-2 INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Resistance Input Capacitance Input Common-Mode Voltage CMRR OUTPUT CHARACTERISTICS Output Voltage Swing Linear Output Current Output Balance Error Conditions VOUT = V p-p VOUT = 2 V p-p VOUT = 2 V p-p VOUT = 2 V p-p VOUT = 2 V p-p VIN = 5 V to 0 V step, G = +2 VOUT = 2 V p-p, 10 MHz VOUT = 2 V p-p, 50 MHz VOUT = 2 V p-p, 10 MHz VOUT = 2 V p-p, 50 MHz f1 = MHz, f2 = MHz f = 30 MHz, RL, dm = 100 f = 10 MHz G = +4, f = 10 MHz f = 10 MHz f = 100 MHz VOS, dm = VOUT, dm/2 VDIN+ = VDIN− = 0 V TMIN to TMAX variation TMIN to TMAX variation Differential Common mode cm = ±1 V, f = 1 MHz Maximum single-ended output Per amplifier, RL, dm = 20 f = 10 MHz dm = 1 V f = 10 MHz Min Typ Max Unit 1000 4700 V/µs −106 −82 −109 −82 89 45 −85 dBc dBm dB −18 −13 −VS + to +VS − −75 mV µV/°C µA µA/°C pF V dB −VS + to +VS − ±75 −60 ADA4938-1/ADA4938-2 VOCM to ±OUT Performance Table Parameter VOCM DYNAMIC PERFORMANCE −3 dB Bandwidth Slew Rate Input Voltage Noise RTI VOCM INPUT CHARACTERISTICS Input Voltage Range Input Resistance Input Offset Voltage Input Bias Current VOCM CMRR Gain POWER SUPPLY Operating Range Quiescent Current Power Supply Rejection Ratio POWER DOWN PD ORDERING GUIDE Model1 ADA4938-1ACPZ-R2 ADA4938-1ACPZ-RL ADA4938-1ACPZ-R7 ADA4938-2ACPZ-R2 ADA4938-2ACPZ-RL ADA4938-2ACPZ-R7 Temperature Range −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C 1 Z = RoHS Compliant Part Package Description 16-Lead LFCSP 16-Lead LFCSP 16-Lead LFCSP 24-Lead LFCSP 24-Lead LFCSP 24-Lead LFCSP Package Option CP-16-21 CP-16-21 CP-16-21 CP-24-10 CP-24-10 CP-24-10 Ordering Quantity 250 5,000 1,500 250 5,000 1,500 Branding H11 ADA4938-1/ADA4938-2 NOTES Data Sheet Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06592-0-6/16 B

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Data Sheet

Extremely low harmonic distortion HD −106 dBc HD2 10 MHz −82 dBc HD2 50 MHz −109 dBc HD3 10 MHz −82 dBc HD3 50 MHz

Low input voltage noise High speed
−3 dB bandwidth of 1000 MHz, G = +1 Slew rate 4700 V/us dB gain flatness to 150 MHz Fast overdrive recovery of 4 ns 1 mV typical offset voltage Externally adjustable gain Differential-to-differential or single-ended-to-differential operation Adjustable output common-mode voltage Wide supply voltage range +5 V to ±5 V Single or dual amplifier configuration available

ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers

The ADA4938-1/ADA4938-2 are low noise, ultralow distortion, high speed differential amplifiers. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 27 MHz, or up to 12 bits from dc to 74 MHz. The output common-mode voltage is adjustable over a wide range, allowing the ADA4938-1/ADA4938-2 to match the input of the ADC. The internal common-mode feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products.

Full differential and single-ended-to-differential gain configurations are easily realized with the ADA4938-1/ADA4938-2. A simple external feedback network of four resistors determines the closed-loop gain of the amplifier.

The ADA4938-1/ADA4938-2 are fabricated using the Analog Devices, Inc., proprietary third generation, high voltage XFCB process, enabling it to achieve very low levels of distortion with an input voltage noise of only The low dc offset and excellent dynamic performance of the ADA4938-1/ADA4938-2

Document Feedback

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.

Ultralow Distortion Differential ADC Driver ADA4938-1/ADA4938-2

FUNCTIONAL BLOCK DIAGRAMS

ADA4938-1

TOP VIEW
16 15 14 13
1 +IN 2 3 +FB 4
12 PD 11 10 +OUT 9 VOCM
06592-001
+VS 5 +VS 6 +VS 7 +VS 8

Figure ADA4938-1 Functional Block Diagram ADA4938-2

TOP VIEW
24 +IN1 23 22 21 20 PD1 19
1 +FB1 2 +VS1 3 +VS1 4 5 +IN2 6
18 +OUT1 17 VOCM1 16 15 14 PD2 13
7 +FB2 8 +VS2 9 +VS2 10 VOCM2 11 +OUT2 12
06592-202

Figure ADA4938-2 Functional Block Diagram

G = +2, VO, dm = 5V p-p

G = +2, VO, dm = 3.2V p-p G = +2, VO, dm = 2V p-p

G = +2, VO, dm = 1V p-p

SFDR dBc
06592-002

FREQUENCY MHz

Figure SFDR vs. Frequency and Output Voltage
makes them well-suited for a wide variety of data acquisition and signal processing applications.

The ADA4938-1 single amplifier is available in a Pb-free, 3 mm x 3 mm, 16-lead LFCSP. The ADA4938-2 dual amplifier is available in a Pb-free, 4 mm x 4 mm, 24-lead LFCSP. The pinouts have been optimized to facilitate layout and minimize distortion. The devices are specified to operate over the extended industrial temperature range of −40°C to +85°C.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Data Sheet

Theory of Operation 19 Analyzing an Application Circuit 19 Setting the Closed-Loop Gain 19 Estimating the Output Noise Voltage 19 The Impact of Mismatches in the Feedback Networks 20 Calculating the Input Impedance of an Application Circuit 20 Input Common-Mode Voltage Range in Single-Supply Applications 20 Terminating a Single-Ended Input 21 Setting the Output Common-Mode Voltage 21

Layout, Grounding, and 23 High Performance ADC Driving 24 Outline Dimensions 25
Ordering Guide 25
Added Settling Time Parameter, Table 3 Changes to Linear Output Current Parameter, Table Changes to Figure 5 and Figure Added EP Row to Table 7 and EP Row to Table 8 Changes to Figure 14 Added New Figure 53, Renumbered Sequentially 16 Changes to Table 19 Added Exposed Pad Notation to Outline Dimensions 25 Changes to Ordering Guide 25
0 Initial Version

Data Sheet

ADA4938-1/ADA4938-2

SPECIFICATIONS

DUAL-SUPPLY OPERATION

TA = 25°C, +VS = 5 V, −VS = −5 V, VOCM = 0 V, RT = Ω, RG = RF = 200 Ω, G = +1, RL, dm = 1 unless otherwise noted. All specifications refer to single-ended input and differential output, unless otherwise noted. For gains other than G = +1, values for RF and RG are shown in Table
±DIN to ±OUT Performance

Table Parameter DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth for dB Flatness Large Signal Bandwidth Slew Rate Settling Time Overdrive Recovery Time NOISE/HARMONIC PERFORMANCE Second Harmonic

Third Harmonic

IMD IP3 Input Voltage Noise Figure Input Current Noise Crosstalk ADA4938-2 INPUT CHARACTERISTICS Offset Voltage

Input Bias Current

Input Resistance

Input Capacitance Input Common-Mode Voltage CMRR OUTPUT CHARACTERISTICS Output Voltage Swing Linear Output Current Output Balance Error

Conditions

VOUT = V p-p VOUT = 2 V p-p VOUT = 2 V p-p VOUT = 2 V p-p VOUT = 2 V p-p VIN = 5 V to 0 V step, G = +2

VOUT = 2 V p-p, 10 MHz VOUT = 2 V p-p, 50 MHz VOUT = 2 V p-p, 10 MHz VOUT = 2 V p-p, 50 MHz f1 = MHz, f2 = MHz f = 30 MHz, RL, dm = 100 f = 10 MHz G = +4, f = 10 MHz f = 10 MHz f = 100 MHz

VOS, dm = VOUT, dm/2 VDIN+ = VDIN− = 0 V TMIN to TMAX variation

TMIN to TMAX variation Differential Common mode
cm = ±1 V, f = 1 MHz

Maximum single-ended output Per amplifier, RL, dm = 20 f = 10 MHz dm = 1 V f = 10 MHz

Min Typ

Max Unit
1000
4700

V/µs
−106 −82 −109 −82 89 45 −85
dBc dBm dB
−18 −13
−VS + to +VS −
−75
mV µV/°C µA µA/°C pF V dB
−VS + to +VS −
±75
−60

ADA4938-1/ADA4938-2

VOCM to ±OUT Performance

Table Parameter VOCM DYNAMIC PERFORMANCE
−3 dB Bandwidth Slew Rate Input Voltage Noise RTI VOCM INPUT CHARACTERISTICS Input Voltage Range Input Resistance Input Offset Voltage Input Bias Current VOCM CMRR Gain POWER SUPPLY Operating Range Quiescent Current

Power Supply Rejection Ratio POWER DOWN PD
ORDERING GUIDE

Model1 ADA4938-1ACPZ-R2 ADA4938-1ACPZ-RL ADA4938-1ACPZ-R7 ADA4938-2ACPZ-R2 ADA4938-2ACPZ-RL ADA4938-2ACPZ-R7

Temperature Range −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C
1 Z = RoHS Compliant Part

Package Description 16-Lead LFCSP 16-Lead LFCSP 16-Lead LFCSP 24-Lead LFCSP 24-Lead LFCSP 24-Lead LFCSP

Package Option CP-16-21 CP-16-21 CP-16-21 CP-24-10 CP-24-10 CP-24-10
Ordering Quantity 250 5,000 1,500 250 5,000 1,500

Branding H11

ADA4938-1/ADA4938-2 NOTES

Data Sheet

Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06592-0-6/16 B

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived ADA4938-2ACPZ-RL Datasheet file may be downloaded here without warranties.

Datasheet ID: ADA4938-2ACPZ-RL 517803