a
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, 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
GENERAL DESCRIPTION
High Output Current
Differential Driver
AD815
FUNCTIONAL BLOCK DIAGRAM
NC 1
NC 2
NC 3
NC 4
5
THERMAL
HEAT TABS
+V
S
*
6
24 NC
23 NC
22 NC
21 NC
AD815
20
THERMAL
HEAT TABS
+V
S
*
TOP VIEW 19
7 (Not to Scale) 18
8
17
+IN1 9
–IN1 10
OUT1 11
–V
S
12
16 +IN2
15 –IN2
14 OUT2
13 +V
S
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.
+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
coupling transformer with a greater than 1:1 turns ratio. The
low harmonic distortion of –66 dB @ 1 MHz into 200
Ω
–40
TOTAL HARMONIC DISTORTION – dBc
–50
–60
–70
–80
–90
–100
R
L
= 50
(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
AMP2
1/2
AD815
–15V
R
2
= 15
1:2
TRANSFORMER
R
L
= 200
(DIFFERENTIAL)
Figure 2. Subscriber Line Differential Driver
–110
100
1k
10k
100k
FREQUENCY – Hz
1M
10M
Figure 1. Total Harmonic Distortion vs. Frequency
REV. C
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