High Output Current
Differential Driver
a
AD815
FUNCTIONAL BLOCK DIAGRAM
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
1
24
NC
NC
NC
NC
NC
NC
NC
NC
2
3
23
22
21
20
19
18
17
16
4
5
AD815
TOP VIEW
(Not to Scale)
THERMAL
HEAT TABS
THERMAL
HEAT TABS
6
7
+V *
+V *
S
S
8
+IN1
–IN1
9
+IN2
10
15 –IN2
OUT1 11
–V
14 OUT2
12
13 +V
S
S
NC = NO CONNECT
*HEAT TABS ARE CONNECTED TO THE POSITIVE SUPPLY.
APPLICATIONS
ADSL, HDSL, and VDSL Line Interface Driver
Coil or Transformer Driver
CRT Convergence and Astigmatism Adjustment
Video Distribution Amp
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.
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,
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.
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
The 24-lead SOIC (RB) is capable of driving 26 dBm for full
rate ADSL with proper heat sinking.
+15V
1/2
AD815
100⍀
–40
R
= 15⍀
1
V
= ؎15V
S
AMP1
G = +10
–50
–60
V
= 40V p-p
OUT
499⍀
R
120⍀
V
=
V =
D
40Vp-p
L
IN
V
=
OUT
G = +10
110⍀
4Vp-p
40Vp-p
–70
499⍀
R
= 50⍀
L
R
= 15⍀
2
–80
(DIFFERENTIAL)
AMP2
–15V
100⍀
1:2
TRANSFORMER
1/2
AD815
R
= 200⍀
L
–90
(DIFFERENTIAL)
–100
Figure 2. Subscriber Line Differential Driver
–110
100
1k
10k
100k
1M
10M
FREQUENCY – Hz
Figure 1. Total Harmonic Distortion vs. Frequency
REV. D
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2015
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