ADA4938-1YCPZ-R7

Preliminary Technical Data FEATURES Extremely low harmonic distortion −108 dBc HD2 @ 10 MHz −79 dBc HD2 @ 70 MHz −125 dBc HD3 @ 10 MHz −87 dBc HD3 @ 70 MHz Low input voltage noise: 2.2 nV/√Hz High speed −3 dB bandwidth of 1.5 GHz, G = 1 Slew rate: 4700 V/μs 0.1 dB gain flatness to 125 MHz Fast settling to 0.01% in 8.5 ns 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 & ± 5 V Pb-free 3 mm x 3 mm LFCSP package Ultra-Low Distortion Differential ADC Driver ADA4938-1 FUNCTIONAL BLOCK DIAGRAM Figure 1. APPLICATIONS ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers GENERAL DESCRIPTION The ADA4938-1 is a low noise, ultra-low distortion, high speed differential amplifier. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 70 MHz. The output common mode voltage is adjustable over a wide range, allowing the ADA4938-1 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. A simple external feedback network of four resistors determines the amplifier’s closed-loop gain. The ADA4938-1 is fabricated using ADI’s proprietary third generation high-voltage XFCB process, enabling it to achieve very low levels of distortion with input voltage noise of only 2.2 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4938-1 make it well suited for a wide variety of data acquisition and signal processing and applications. The ADA4938-1 is available in a Pb-free, 3 mm x 3mm lead frame chip scale package (LFCSP). It is specified to operate over the extended industrial temperature range of −40°C to +85°C. Rev. PrA 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. ADA4938-1 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Dual Supply Operation ................................................................ 3 Preliminary Technical Data Single Supply Operation...............................................................5 Absolute Maximum Ratings ............................................................7 Thermal Resistance .......................................................................7 ESD Caution...................................................................................7 Pin Configuration and Function Descriptions..............................8 Outline Dimensions ..........................................................................9 Ordering Guide .............................................................................9 REVISION HISTORY 12/06—Revision PrA: Initial Version Rev. PrA | Page 2 of 9 Preliminary Technical Data SPECIFICATIONS DUAL SUPPLY OPERATION ADA4938-1 At 25 °C, +VS = 5 V, −VS = −5 V, VOCM = 0 V, RG = RF = 200 Ω, G = +1, RL, dm = 1 kΩ, unless otherwise noted. All specifications refer to single-ended input and differential outputs, unless otherwise noted. Table 1. Parameter ±DIN TO ±OUT PERFORMANCE DYNAMIC PERFORMANCE −3 dB Small Signal Bandwidth Bandwidth for 0.1 dB Flatness Large Signal Bandwidth Slew Rate Settling Time Overdrive Recovery Time NOISE/HARMONIC PERFORMANCE 1 Second Harmonic Third Harmonic IMD IP3 Voltage Noise (RTI) Noise Figure Input Current Noise INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Resistance Input Capacitance Input Common-Mode Voltage CMRR OUTPUT CHARACTERISTICS Output Voltage Swing Output Current Output Balance Error VOCM to ±OUT PERFORMANCE 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 TMIN to TMAX variation Differential Common mode Conditions Min Typ Max Unit VOUT = 0.5 V p-p, Differential Input VOUT = 2 V p-p, Differential Input VOUT = 2 V p-p, Differential Input VOUT = 4 V p-p, Differential Input VOUT = 2 V p-p 0.01%, VOUT = 2 Vp-p VIN = 5 V to 0 V step, G = +2 VOUT = 2 V p-p, 10 MHz VOUT = 2 V p-p, 70 MHz VOUT = 2 V p-p, 10 MHz VOUT = 2 V p-p, 70 MHz 70 MHz 70 MHz G = +2 1500 125 1300 800 4700 8.5 4 −108 −79 −125 −87 MHz MHz MHz MHz V/μs ns ns dBc dBc dBc dBc dBc dBm nV/√Hz dB pA/√Hz mV μV/°C μA μA/°C MΩ MΩ pF V dB 4 V mA dB 2.2 12 2 1 ±4 3.5 −0.01 6 3 1 −4.7 to 3.4 −77 1 95 −66 VOS, dm = VOUT, dm/2; VDIN+ = VDIN− = 0 V TMIN to TMAX variation ∆VOUT, dm/∆VIN, cm; ∆VIN, cm = ±1 V Maximum ∆VOUT; single-ended output ∆VOUT, cm/∆VOUT, dm; ∆VOUT, dm = 1 V; 10 MHz 400 1700 7.5 −3.8 VOS, cm = VOUT, cm; VDIN+ = VDIN– = 0 V ∆VOUT, dm/∆VOCM; ∆VOCM = ±1 V ∆VOUT, cm/∆VOCM; ∆VOCM = ±1 V Rev. PrA | Page 3 of 9 MHz V/μs nV/√Hz 3.8 V kΩ mV μA dB V/V 200 1 0.5 −75 1 3.5 ADA4938-1 Parameter Operating Range Quiescent Current Conditions Preliminary Technical Data Min 4.5 Typ 40 40