Ultralow Distortion Current Feedback ADC Driver ADA4927-1/ADA4927-2

Transcription

1 FEATURES Extremely low harmonic distortion MHz MHz MHz MHz MHz MHz Better distortion at higher gains than F amplifiers Low input-referred noise: 1.3 n/ Hz, 23 pa/ Hz High speed 3 db large signal bandwidth of 1 GHz, G = 1 Slew rate: 6000 /µs, 25% to 75% 0.1 db gain flatness: 250 MHz Fast overdrive recovery of 2.6 ns 1 m typical offset voltage Externally adjustable gain Differential-to-differential or single-ended-to-differential operation Adjustable output common-mode voltage Single-supply or dual operation: 5 to ±5 Available in small, Pb-free LFCSP packages Ultralow Distortion Current Feedback ADC Driver FUNCTIONAL BLOCK DIAGRAMS Figure 1. APPLICATIONS Current Feedback ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers GENERAL DESCRIPTION The are low noise, ultralow distortion, high speed current feedback differential amplifiers that are ideal choices for driving high performance ADCs with resolutions up to 16 bits from dc to 100 MHz. The adjustable output common-mode levels can easily be matched to the required ADC input common-mode levels. The internal common-mode feedback loop provides exceptional output balance and suppression of even-order distortion products. Differential gain configurations are easily realized with the using simple external feedback networks comprised of four resistors. The current feedback architecture provides loop gain that is nearly independent of closed-loop gain, thus achieving wide bandwidth, low distortion, and low noise at high gains, all at lower power Rev. PrB 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. Figure 2. consumption than comparable voltage feedback amplifiers. The are fabricated using Analog Devices, Inc. proprietary silicon-germanium (SiGe), complementary bipolar process, enabling very low levels of distortion with an input voltage noise of only 1.3 n/ Hz. The low dc offset and excellent dynamic performance of the make them well suited for a wide variety of data acquisition and signal processing applications. The ADA is available in a Pb-free, 3 mm 3 mm 16-lead LFCSP and the ADA in a Pb-free, 4 mm 4 mm 24-lead LFCSP. The pinouts have been optimized to facilitate PCB layout and to minimize distortion. They are specified to operate over the 40 C to +105 C temperature range. One Technology Way, P.O. Box 9106, Norwood, MA , U.S.A. Tel: Fax: Analog Devices, Inc. All rights reserved.

2 TABLE OF CONTENTS Features... 1 Applications... 1 Functional Block Diagrams... 1 General Description... 1 Preliminary Technical Data Revision History...2 Specifications...3 Outline Dimensions...7 Ordering Guide...7 REISION HISTORY Revision B: Edited From Advanced B 08/08 Rev. PrB Page 2 of 7

3 SPECIFICATIONS S = ±5, OCM = 0, RF = 348 Ω, RG = 367 Ω, RL, dm = 1 25 C, unless otherwise noted. TMIN to TMAX = 40 C to +85 C. Table 1. DIFFERENTIAL INPUT PERFORMANCE DYNAMIC PERFORMANCE 3 db Small Signal Bandwidth O, dm = 0.1 p-p 1400 MHz 3 db Large Signal Bandwidth O, dm = 2 p-p 1000 MHz Bandwidth for 0.1 db Flatness O, dm = 0.1 p-p 250 MHz Slew Rate O, dm = 2 Step 6000 /µs Settling Time to 0.01% O, dm = 2 Step 2.6 ns Overdrive Recovery Time G = 2, IN, dm = 12 p-p Triangle Wave ns NOISE/HARMONIC PERFORMANCE Second Harmonic OUT, dm = 2 P-P, 10 MHz -117 OUT, dm = 2 P-P, 70 MHz -85 OUT, dm = 2 P-P, 100 MHz -75 Third Harmonic OUT, dm = 2 P-P, 10 MHz -122 OUT, dm = 2 P-P, 70 MHz -95 OUT, dm = 2 P-P, 100 MHz -85 Third-Order IMD O, dm = 2 p-p, fc = MHz ± 0.05 MHz Input oltage Noise f = 100 KHz 1.3 n/ Hz Input Current Noise f = 100 KHz 23 pa/ Hz DC PERFORMANCE Input Offset oltage IP = IN = OCM = 0 1 m Input Offset oltage Drift TMIN to TMAX 5 µ/ºc Input Bias Current TMIN to TMAX 30 µa Input Offset Current 4 µa Open-Loop Gain db INPUT CHARACTERISTICS Input Common-Mode oltage Range Input Resistance Differential kω Common Mode Input Capacitance Common Mode pf CMRR ICM = ±1 dc db OUTPUT CHARACTERISTICS Output oltage Swing Each Single-Ended Output Each Single-Ended Output, RL, dm = Open Circuit Output Current Each Single-Ended Output 50 ma Output Balance Error f = 1 MHz db OCM to O, cm PERFORMANCE OCM DYNAMIC PERFORMANCE 3 db Bandwidth O, cm = 0.1 p-p 800 MHz Slew Rate O, cm = 2 p-p /µs Gain 1 / OCM INPUT CHARACTERISTICS Input oltage Range Input Resistance Input Offset oltage OS, cm = O, cm OCM; IP = IN = OCM = 0 µ Input oltage Noise f = 100 khz n/ Hz Input Bias Current µa CMRR OCM/ O, dm, OCM = ±1 db Rev. PrB Page 3 of 7

4 Preliminary Technical Data POWER SUPPLY Operating Range 5 10 Quiescent Current 22 ma +PSRR Change in +S = ±1 db PSRR Change in S = ±1 db OPERATING TEMPERATURE RANGE C Rev. PrB Page 4 of 7

5 S = +5, OCM = +2.5, RF = 348 Ω, RG = 367 Ω, RL, dm = 1 25 C, unless otherwise noted. TMIN to TMAX = 40 C to +105 C. Table 2. DIFFERENTIAL INPUT PERFORMANCE DYNAMIC PERFORMANCE 3 db Small Signal Bandwidth O, dm = 0.1 p-p MHz 3 db Large Signal Bandwidth O, dm = 2 p-p MHz Bandwidth for 0.1 db Flatness O, dm = 0.1 p-p MHz Slew Rate O, dm = 2 Step /μs Settling Time to 0.01% O, dm = 2 Step ns Overdrive Recovery Time G = 2, IN, dm = 7 p-p Triangle Wave ns NOISE/HARMONIC PERFORMANCE Second Harmonic OUT, dm = 2 P-P, 10 MHz OUT, dm = 2 P-P, 70 MHz OUT, dm = 2 P-P, 100 MHz Third Harmonic OUT, dm = 2 P-P, 10 MHz OUT, dm = 2 P-P, 70 MHz OUT, dm = 2 P-P, 100 MHz Third-Order IMD O, dm = 2 p-p, fc = MHz ± 0.05 MHz Input oltage Noise f = 100 khz n/ Hz Input Current Noise f = 100 khz pa/ Hz DC PERFORMANCE Input Offset oltage IP = IN = OCM =0 µ Input Offset oltage Drift TMIN to TMAX µ/ºc Input Bias Current TMIN to TMAX μa Input Offset Current µa Open-Loop Gain db INPUT CHARACTERISTICS Input Common-Mode oltage Range Input Resistance Differential KΩ Common-Mode Input Capacitance Common-Mode pf CMRR ICM = ±1 dc db OUTPUT CHARACTERISTICS Output oltage Swing Each Single-Ended Output Each Single-Ended Output, RL, dm = Open Circuit Output Current Each Single-Ended Output ma Output Balance Error f = 1 MHz db OCM to O, cm PERFORMANCE OCM DYNAMIC PERFORMANCE 3 db Bandwidth O, cm = 0.1 p-p MHz Slew Rate O, cm = 2 p-p /μs Gain 1 / OCM INPUT CHARACTERISTICS Input oltage Range Input Resistance Input Offset oltage OS, cm = O, cm OCM; IP = IN = OCM = 2.5 m Input oltage Noise f = 100 KHz n/ Hz Input Bias Current μa CMRR OCM/ O(dm), OCM = ±1 db POWER SUPPLY Rev. PrB Page 5 of 7

6 Preliminary Technical Data Operating Range Quiescent Current ma +PSRR Change in +S = ±1 db PSRR Change in S = ±1 db OPERATING TEMPERATURE RANGE C Rev. PrB Page 6 of 7

7 OUTLINE DIMENSIONS 3.00 TOP IEW MAX 0.30 * SQ 1.15 EXPOSED PAD SEATING PLANE 12 MAX 0.80 MAX 0.65 TYP MAX 0.02 NOM 0.20 REF BSC 1.50 REF 9 (BOTTOM IEW) MIN *COMPLIANT TO JEDEC STANDARDS MO-220-EED-2 EXCEPT FOR EXPOSED PAD DIMENSION. Figure Lead Lead Frame Chip Scale Package [LFCSP_Q] 3 mm 3 mm Body, ery Thin Quad (CP-16-2) Dimensions shown in millimeters MAX 4.00 TOP IEW 0.80 MAX 0.65 TYP MAX 0.02 NOM 0.60 MAX BSC MAX 24 1 EXPOSED PAD (BOTTOM IEW) SQ MIN 2.50 REF SEATING PLANE REF COPLANARITY 0.08 COMPLIANT TO JEDEC STANDARDS MO-220-GGD-2 Figure Lead Lead Frame Chip Scale Package [LFCSP_Q] 4 mm 4 mm Body, ery Thin Quad (CP-24-1) Dimensions shown in millimeters ORDERING GUIDE Model Temperature Range Package Description Package Option Ordering Quantity Branding ADA4927-1XCPZ 1 40 C to +105 C 16-Lead LFCSP_Q CP-16-2 H1M ADA4927-1YCPZ-R C to +105 C 16-Lead LFCSP_Q CP ADA4927-1YCPZ-RL 1 40 C to +105 C 16-Lead LFCSP_Q CP ,000 ADA4927-1YCPZ-R C to +105 C 16-Lead LFCSP_Q CP ,500 ADA4927-2YCPZ-R C to +105 C 24-Lead LFCSP_Q CP ADA4927-2YCPZ-RL 1 40 C to +105 C 24-Lead LFCSP_Q CP ,000 ADA4927-2YCPZ-R C to +105 C 24-Lead LFCSP_Q CP ,500 1 Z = RoHS Compliant Part Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR /08(PrB) Rev. PrB Page 7 of 7