High Speed, Video Difference Amplifier AD830 FEATURES CONNECTION DIAGRAM Differential amplification AD830 X1 1 8 V P G M Wide common-mode voltage range: +12.8 V to 12 V X2 2 7 OUT Differential voltage: 2 V A = 1 Y1 3 6 NC High CMRR: 60 dB at 4 MHz G M Built-in differential clipping level: 2.3 V Y2 4 C 5 V N Fast dynamic performance NC = NO CONNECT 85 MHz unity gain bandwidth Figure 1. 8-Lead Plastic PDIP (N), CERDIP (Q), and SOIC (RN) Packages 35 ns settling time to 0.1% 110 360 V/s slew rate Symmetrical dynamic response 100 Excellent video specifications Differential gain error: 0.06% 90 Differential phase error: 0.08 80 V = 15V 15 MHz (0.1 dB) bandwidth S Flexible operation 70 High output drive of 50 mA min 60 Specified with both 5 V and 15 V supplies V = 5V S 50 Low distortion: THD = 72 dB 4 MHz Excellent DC performance: 3 mV max input 40 Offset voltage 30 APPLICATIONS 1k 10k 100k 1M 10M FREQUENCY (Hz) Differential line receiver Figure 2. Common-Mode Rejection Ratio vs. Frequency High speed level shifter High speed in-amp Differential to single-ended conversion Good gain flatness and excellent differential gain of 0.06% and Resistorless summation and subtraction phase of 0.08 make the AD830 suitable for many video system High speed analog-to-digital converter applications. Furthermore, the AD830 is suited for general-purpose signal processing from dc to 10 MHz. 9 V = 5V GENERAL DESCRIPTION S R = 150 L 6 The AD830 is a wideband, differencing amplifier designed for use at video frequencies but also useful in many other applications. It 3 C = 33pF L accurately amplifies a fully differential signal at the input and 0 produces an output voltage referred to a user-chosen level. The 3 undesired common-mode signal is rejected, even at high C = 4.7pF L 6 frequencies. High impedance inputs ease interfacing to finite 9 source impedances and, thus, preserve the excellent common- 12 mode rejection. In many respects, it offers significant C = 15pF L improvements over discrete difference amplifier approaches, in 15 particular in high frequency common-mode rejection. 18 The wide common-mode and differential voltage range of the 21 10k 100k 1M 10M 100M 1G AD830 make it particularly useful and flexible in level shifting FREQUENCY (Hz) applications but at lower power dissipation than discrete solutions. Figure 3. Closed-Loop Gain vs. Frequency, Gain = +1 Low distortion is preserved over the many possible differential and common-mode voltages at the input and output. Rev. C 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20052010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. CMRR (dB) GAIN (dB) 00881-001 00881-003 00881-002AD830 TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 11 Applications ....................................................................................... 1 Traditional Differential Amplification .................................... 11 Connection Diagram ....................................................................... 1 Problems With the Op Amp Based Approach ....................... 11 General Description ......................................................................... 1 AD830 for Differential Amplification ..................................... 11 Revision History ............................................................................... 2 Advantageous Properties of the AD830 .................................. 11 Specif icat ions ..................................................................................... 3 Understanding the AD830 Topology ...................................... 11 Absolute Maximum Ratings ............................................................ 7 Interfacing the Input .................................................................. 12 Maximum Power Dissipation ..................................................... 7 Supplies, Bypassing, and Grounding (Figure 34) ................... 14 Thermal Resistance ...................................................................... 7 AC-Coupled Line Receiver ....................................................... 17 ESD Caution .................................................................................. 7 Outline Dimensions ....................................................................... 19 Typical Performance Characteristics ............................................. 8 Ordering Guide .......................................................................... 20 REVISION HISTORY 3/10Rev. B to Rev. C Updated Format .................................................................. Universal Changes to Ordering Guide .......................................................... 20 1/03Rev. A to Rev. B. Updated Ordering Guide ................................................................ 4 Change to Figure 30 ...................................................................... 14 Updated Outline Dimensions ..................................................... 15 Rev. C Page 2 of 20