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Analog Devices |
a
High Output Current
Differential Driver
AD815
FEATURES
Flexible Configuration
Differential Input and Output Driver
or Two Single-Ended Drivers
Industrial Temperature Range
High Output Power
Thermally Enhanced SOIC
400 mA Minimum Output Drive/Amp, RL = 10 ⍀
Low Distortion
–66 dB @ 1 MHz THD, RL = 200 ⍀, VOUT = 40 V p-p
0.05% and 0.45؇ Differential Gain and Phase, RL = 25 ⍀
(6 Back-Terminated Video Loads)
High Speed
120 MHz Bandwidth (–3 dB)
900 V/s Differential Slew Rate
70 ns Settling Time to 0.1%
Thermal Shutdown
APPLICATIONS
ADSL, HDSL, and VDSL Line Interface Driver
Coil or Transformer Driver
CRT Convergence and Astigmatism Adjustment
Video Distribution Amp
Twisted Pair Cable Driver
GENERAL DESCRIPTION
The AD815 consists of two high speed amplifiers capable of
supplying a minimum of 500 mA. They are typically configured
as a differential driver enabling an output signal of 40 V p-p on
± 15 V supplies. This can be increased further with the use of a
coupling transformer with a greater than 1:1 turns ratio. The
low harmonic distortion of –66 dB @ 1 MHz into 200 Ω
–40
VS = ؎15V
–50
G = +10
VOUT = 40V p-p
–60
–70
–80
–90
–100
RL = 50⍀
(DIFFERENTIAL)
RL = 200⍀
(DIFFERENTIAL)
–110
100
1k 10k 100k 1M 10M
FREQUENCY – Hz
Figure 1. Total Harmonic Distortion vs. Frequency
FUNCTIONAL BLOCK DIAGRAM
NC 1
24 NC
NC 2
23 NC
NC 3
22 NC
NC 4
21 NC
THERMAL
HEAT TABS
+VS*
5 AD815 20
6 TOP VIEW 19
7 (Not to Scale) 18
8 17
THERMAL
HEAT TABS
+VS*
+IN1 9
16 +IN2
–IN1 10
15 –IN2
OUT1 11
14 OUT2
–VS 12
13 +VS
NC = NO CONNECT
*HEAT TABS ARE CONNECTED TO THE POSITIVE SUPPLY.
combined with the wide bandwidth and high current drive make
the differential driver ideal for communication applications such
as subscriber line interfaces for ADSL, HDSL and VDSL.
The AD815 differential slew rate of 900 V/µs and high load drive
are suitable for fast dynamic control of coils or transformers,
and the video performance of 0.05% and 0.45° differential gain
and phase into a load of 25 Ω enable up to 12 back-terminated
loads to be driven.
The 24-lead SOIC (RB) is capable of driving 26 dBm for full
rate ADSL with proper heat sinking.
100⍀
+15V
1/2
AD815
AMP1
R1 = 15⍀
499⍀
VIN =
4Vp-p
110⍀ G = +10
VD =
40Vp-p
RL
120⍀
499⍀
100⍀
AMP2
1/2
AD815
R2 = 15⍀
1:2
TRANSFORMER
–15V
VOUT =
40Vp-p
Figure 2. Subscriber Line Differential Driver
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
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/461-3113 © 2015 Analog Devices, Inc. All rights reserved.
AD815* Product Page Quick Links
Last Content Update: 11/01/2016
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Documentation
Application Notes
• AN-649: Using the Analog Devices Active Filter Design
Tool
Data Sheet
• AD815: High Output Current Differential Driver Data Sheet
Tools and Simulations
• AD815 SPICE Macro-Model
Reference Materials
Tutorials
• MT-034: Current Feedback (CFB) Op Amps
• MT-051: Current Feedback Op Amp Noise Considerations
• MT-057: High Speed Current Feedback Op Amps
• MT-059: Compensating for the Effects of Input Capacitance
on VFB and CFB Op Amps Used in Current-to-Voltage
Converters
Design Resources
• AD815 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
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