Datasheet ADA4927-1/ADA4927-2 (Analog Devices)

Ultralow Distortion Current Feedback Differential ADC Driver Data Sheet ADA4927-1/ADA4927-2 FEATURES FUNCTIONAL BLOCK DIAGRAMS Extremely low harmonic distortion ADA4927-1 −105 dBc HD2 at 10 MHz S S S S –V –V –V –V −91 dBc HD2 at 70 MHz 16 15 14 13 −87 dBc HD2 at 100 MHz −103 dBc HD3 at 10 MHz –FB 1 12 PD −98 dBc HD3 at 70 MHz +IN 2 11 –OUT −89 dBc HD3 at 100 MHz –IN 3 10 +OUT Better distortion at higher gains than VF amplifiers +FB 4 9 VOCM Low input voltage noise: 1.4 nV/√Hz 5 6 7 8
001
High speed S S S S +V +V +V +V
07574-
−3 dB bandwidth of 2.3 GHz
Figure 1.
1 0.1 dB gain flatness: 150 MHz B1 S1 S1 UT N1I F D1 Slew rate: 5000 V/µs, 25% to 75% + – –V –V P –O 24 23 22 21 20 19 Fast 0.1% settling time: 10 ns Low input offset voltage: 0.3 mV typical –IN1 1 18 +OUT1 Externally adjustable gain +FB1 2 17 VOCM1 +V 3 16 S1 –VS2 Stability and bandwidth controlled by feedback resistor ADA4927-2 +V 4 15 S1 –VS2 Differential-to-differential or single-ended-to-differential –FB2 5 14 PD2 operation +IN2 6 13 –OUT2 Adjustable output common-mode voltage 7 8 9 1 10 1 12 Wide supply operation: +5 V to ±5 V 2 N2 B2 S2 S2 T2
002
F CM –I + +V +V O OU APPLICATIONS V +
07574- Figure 2.
ADC drivers –40 VOUT, dm = 2V p-p Single-ended-to-differential converters –50 Bc) IF and baseband gain blocks d ( E –60 Differential buffers Differential line drivers –70 IC RANG –80 GENERAL DESCRIPTION NAM
The ADA4927 is a low noise, ultralow distortion, high speed,
DY –90 E
current feedback differential amplifier that is an ideal choice for
RE –100 -F
driving high performance ADCs with resolutions up to 16 bits
US G = 1 O –110
from dc to 100 MHz. The output common-mode level can easily be
G = 10 URI G = 20
matched to the required ADC input common-mode levels. The
P –120 S
internal common-mode feedback loop provides exceptional output
–130 1 10 100 1k
026 balance and suppression of even-order distortion products.
FREQUENCY (MHz)
07574- Differential gain configurations are easily realized using an Figure 3. Spurious-Free Dynamic Range vs. Frequency at Various Gains external feedback network comprising four resistors. The The low dc offset and excellent dynamic performance of the current feedback architecture provides loop gain that is nearly ADA4927 make it wel suited for a wide variety of data acquisition independent of closed-loop gain, achieving wide bandwidth, and signal processing applications. low distortion, and low noise at higher gains and lower power consumption than comparable voltage feedback amplifiers. The ADA4927-1 is available in a Pb-free, 3 mm × 3 mm 16-lead The ADA4927 is fabricated using the Analog Devices, Inc., LFCSP, and the ADA4927-2 is available in a Pb-free, 4 mm × 4 mm silicon-germanium complementary bipolar process, enabling 24-lead LFCSP. The pinouts are optimized to facilitate printed very low levels of distortion with an input voltage noise of only circuit board (PCB) layout and to minimize distortion. They are 1.3 nV/√Hz. specified to operate over the −40°C to +105°C temperature range.
Rev. B 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2008–2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS REVISION HISTORY SPECIFICATIONS ±5 V OPERATION ±DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance +5 V OPERATION ±DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE MAXIMUM POWER DISSIPATION ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS THEORY OF OPERATION DEFINITION OF TERMS Differential Voltage Common-Mode Voltage Balance APPLICATIONS INFORMATION ANALYZING AN APPLICATION CIRCUIT SETTING THE CLOSED-LOOP GAIN ESTIMATING THE OUTPUT NOISE VOLTAGE IMPACT OF MISMATCHES IN THE FEEDBACK NETWORKS CALCULATING THE INPUT IMPEDANCE FOR AN APPLICATION CIRCUIT Terminating a Single-Ended Input INPUT COMMON-MODE VOLTAGE RANGE INPUT AND OUTPUT CAPACITIVE AC COUPLING SETTING THE OUTPUT COMMON-MODE VOLTAGE POWER-DOWN Power-Down in Cold Applications LAYOUT, GROUNDING, AND BYPASSING HIGH PERFORMANCE ADC DRIVING OUTLINE DIMENSIONS ORDERING GUIDE