a
FEATURES
Flexible Configuration
Differential Input and Output Driver
or Two Single-Ended Drivers
High Output Power
Power Package
26 dBm Differential Line Drive for ADSL Application
40 V p-p Differential Output Voltage, R
L
= 50
500 mA Minimum Output Drive/Amp, R
L
= 5
Thermally Enhanced SOIC
400 mA Minimum Output Drive/Amp, R
L
= 10
Low Distortion
–66 dB @ 1 MHz THD, R
L
= 200 , V
OUT
= 40 V p-p
0.05% and 0.45 Differential Gain and Phase, R
L
= 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
PRODUCT DESCRIPTION
High Output Current
Differential Driver
AD815
FUNCTIONAL BLOCK DIAGRAM
15-Lead Through-Hole SIP (Y) and Surface-Mount
DDPAK(VR)
15
14
13
TAB IS
+V
S
12
11
10
9
8
7
6
5
4
3
2
1
NC = NO CONNECT
REFER TO PAGE 3 FOR 24-LEAD SOIC PACKAGE
NC
NC
NC
NC
+IN2
–IN2
OUT2
+V
S
–V
S
OUT1
–IN1
+IN1
NC
NC
NC
AD815
coupling transformer with a greater than 1:1 turns ratio. The
low harmonic distortion of –66 dB @ 1 MHz into 200
Ω
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.
Three package styles are available, and all work over the
industrial temperature range (–40°C to +85°C). Maximum
output power is achieved with the power package available for
through-hole mounting (Y) and surface-mounting (VR). The
24-lead SOIC (RB) is capable of driving 26 dBm for full rate
ADSL with proper heat sinking.
+15V
100
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
–40
TOTAL HARMONIC DISTORTION – dBc
–50
–60
–70
–80
–90
–100
–110
100
R
L
= 50
(DIFFERENTIAL)
R
L
= 200
(DIFFERENTIAL)
V
S
= 15V
G = +10
V
OUT
= 40V p-p
1/2
AD815
AMP1
499
R
1
= 15
V
IN
=
4Vp-p
110
G = +10
499
V
D
=
40Vp-p
R
L
120
V
OUT
=
40Vp-p
100
1k
10k
100k
FREQUENCY – Hz
1M
10M
AMP2
1/2
AD815
–15V
R
2
= 15
1:2
TRANSFORMER
Total Harmonic Distortion vs. Frequency
Subscriber Line Differential Driver
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
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