Datasheet AD815 (Analog Devices)

a
High Output Current Differential Driver AD815 FEATURES FUNCTIONAL BLOCK DIAGRAM Flexible Configuration Differential Input and Output Driver NC 1 24 NC or Two Single-Ended Drivers NC 2 23 NC Industrial Temperature Range NC 3 22 NC High Output Power NC 4 21 NC Thermally Enhanced SOIC 5 20 AD815 400 mA Minimum Output Drive/Amp, R THERMAL L = 10
⍀
6 THERMAL TOP VIEW 19 HEAT TABS HEAT TABS Low Distortion (Not to Scale) 7 18 +V +V S* S* –66 dB @ 1 MHz THD, RL = 200
⍀
, VOUT = 40 V p-p 8 17 0.05% and 0.45
ⴗ
Differential Gain and Phase, RL = 25
⍀
+IN1 9 16 +IN2 (6 Back-Terminated Video Loads) –IN1 10 15 –IN2 High Speed OUT1 11 14 OUT2 120 MHz Bandwidth (–3 dB) –V 12 13 S +VS 900 V/
␮
s Differential Slew Rate NC = NO CONNECT 70 ns Settling Time to 0.1% *HEAT TABS ARE CONNECTED TO THE POSITIVE SUPPLY. Thermal Shutdown APPLICATIONS ADSL, HDSL, and VDSL Line Interface Driver Coil or Transformer Driver
combined with the wide bandwidth and high current drive make
CRT Convergence and Astigmatism Adjustment
the differential driver ideal for communication applications such
Video Distribution Amp
as subscriber line interfaces for ADSL, HDSL and VDSL.
Twisted Pair Cable Driver
The AD815 differential slew rate of 900 V/µs and high load drive are suitable for fast dynamic control of coils or transformers,
GENERAL DESCRIPTION
and the video performance of 0.05% and 0.45° differential gain The AD815 consists of two high speed amplifiers capable of and phase into a load of 25 Ω enable up to 12 back-terminated supplying a minimum of 500 mA. They are typically configured loads to be driven. as a differential driver enabling an output signal of 40 V p-p on ± The 24-lead SOIC (RB) is capable of driving 26 dBm for full 15 V supplies. This can be increased further with the use of a rate ADSL with proper heat sinking. coupling transformer with a greater than 1:1 turns ratio. The low harmonic distortion of –66 dB @ 1 MHz into 200 Ω
+15V 100
⍀
1/2 –40 AD815 R1 = 15
⍀
VS =
ⴞ
15V AMP1 G = +10 –50 VOUT = 40V p-p 499
⍀
–60 V V R IN = D = L 110
⍀
V G = +10 OUT = 4Vp-p 40Vp-p 120
⍀
40Vp-p –70 499
⍀
R –80 L = 50
⍀
R2 = 15
⍀
(DIFFERENTIAL) 100
⍀
AMP2 1:2 R 1/2 –90 L = 200
⍀
AD815 TRANSFORMER (DIFFERENTIAL) –15V –100 TOTAL HARMONIC DISTORTION – dBc
Figure 2. Subscriber Line Differential Driver
–110 100 1k 10k 100k 1M 10M FREQUENCY – Hz
Figure 1. Total Harmonic Distortion vs. Frequency REV. D 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. No license is granted by implication or otherwise
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
under any patent or patent rights of Analog Devices. Trademarks and
Tel: 781/329-4700 www.analog.com
registered trademarks are the property of their respective owners.
Fax: 781/461-3113 © 2015 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION MAXIMUM POWER DISSIPATION Typical Performance Characteristics THEORY OF OPERATION Choice of Feedback and Gain Resistors PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS POWER SUPPLY BYPASSING DC ERRORS AND NOISE POWER CONSIDERATIONS Other Power Considerations Parallel Operation Differential Operation Creating Differential Signals Direct Single-Ended-to-Differential Conversion Twelve Channel Video Distribution Amplifier OUTLINE DIMENSIONS Ordering Guide Revision History