High Voltage, Differential 18-Bit ADC Driver Data Sheet ADA4922-1 FEATURES FUNCTIONAL BLOCK DIAGRAM Single-ended-to-differential conversion ADA4922-1 TOP VIEW Low distortion (V = 40 V p-p) O, dm 99 dBc HD at 100 kHz IN NIC 1 8 Low differential output referred noise: 12 nV/Hz REF 2 7 DIS High input impedance: 11 M V 3 6 V S+ S Fixed gain of 2 4 5 OUT OUT+ No external gain components required Low output-referred offset voltage: 1.1 mV maximum NOTES 1. EXPOSED PAD MUST BE CONNECTED TO GND. Low input bias current: 3.5 A maximum 2. NIC = NO INTERAL CONNECTION. Wide supply range Figure 1. 5 V to 26 V Can produce differential output signals in excess of 40 V p-p High speed 38 MHz, 3 dB bandwidth at 0.2 V p-p differential output Fast settling time 200 ns to 0.01% for 12 V step on 5 V supplies Disable feature Available in space-saving, thermally enhanced packages 8-lead, 3 mm 3 mm LFCSP The ADA4922-1 is manufactured on Analog Devices, Inc., 8-lead SOIC proprietary, second-generation XFCB process that enables the Low supply current: I = 10 mA on 12 V supplies amplifier to achieve excellent noise and distortion performance S on high supply voltages. APPLICATIONS The ADA4922-1 is available in an 8-lead 3 mm 3 mm LFCSP as well as an 8-lead SOIC package. Both packages are equipped High voltage data acquisition systems with an exposed paddle for more efficient heat transfer. The Industrial instrumentation ADA4922-1 is rated to work over the extended industrial Spectrum analysis temperature range, 40C to +85C. ATE Medical instruments 84 R = 2k SECOND HARMONIC L 87 GENERAL DESCRIPTION THIRD HARMONIC 90 The ADA4922-1 is a differential driver for 16-bit to 18-bit 93 analog-to-digital converters (ADCs) that have differential input 96 V = 5V, V = 12V p-p S O, dm ranges up to 20 V. Configured as an easy-to-use, single-ended- 99 to-differential amplifier, the ADA4922-1 requires no external 102 components to drive ADCs. The ADA4922-1 provides essential 105 benefits such as low distortion and high SNR that are required 108 for driving ADCs with resolutions up to 18 bits. 111 114 With a wide supply voltage range (5 V to 26 V), high input 117 V = 12V, V = 40V p-p S O, dm impedance, and fixed differential gain of 2, the ADA4922-1 is 120 1 10 100 designed to drive ADCs found to in a variety of applications, FREQUENCY (kHz) including industrial instrumentation. Figure 2. Harmonic Distortion for Various Power Supplies Rev. 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DISTORTION (dBc) 05681-001 05681-012ADA4922-1 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 14 Applications ....................................................................................... 1 Applications Information .............................................................. 16 General Description ......................................................................... 1 ADA4922-1 Differential Output Noise Model .......................... 16 Functional Block Diagram .............................................................. 1 Using the REF Pin ...................................................................... 16 Revision History ............................................................................... 2 Internal Feedback Network Power Dissipation ...................... 17 Specif icat ions ..................................................................................... 3 Disable Feature ........................................................................... 17 Absolute Maximum Ratings ............................................................ 5 Driving a Differential Input ADC ............................................ 17 Thermal Resistance ...................................................................... 5 Printed Circuit Board Layout Considerations ....................... 18 Maximum Power Dissipation ..................................................... 5 Outline Dimensions ....................................................................... 19 ESD Caution .................................................................................. 5 Ordering Guide .......................................................................... 19 Pin Configuration and Function Descriptions ............................. 6 Typical Performance Characteristics ............................................. 7 REVISION HISTORY 5/2016Rev. 0 to Rev. A Change CP-8-2 to CP-8-13 ........................................... Throughout Changes to Figure 1 .......................................................................... 1 Changes to Figure 4 .......................................................................... 6 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 10/2005Revision 0: Initial Version Rev. A Page 2 of 19