AD815-EB Analog Devices, AD815-EB Datasheet

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AD815-EB

Manufacturer Part Number
AD815-EB
Description
High Output Current Differential Driver
Manufacturer
Analog Devices
Datasheet
a
PRODUCT 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
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.
15 V supplies. This can be increased further with the use of a
FEATURES
Flexible Configuration
High Output Power
Low Distortion
High Speed
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
Thermally Enhanced SOIC
Differential Input and Output Driver
or Two Single-Ended Drivers
Power Package
–66 dB @ 1 MHz THD, R
0.05% and 0.45 Differential Gain and Phase, R
120 MHz Bandwidth (–3 dB)
900 V/ s Differential Slew Rate
70 ns Settling Time to 0.1%
26 dBm Differential Line Drive for ADSL Application
40 V p-p Differential Output Voltage, R
500 mA Minimum Output Drive/Amp, R
400 mA Minimum Output Drive/Amp, R
(6 Back-Terminated Video Loads)
–100
–110
–40
–50
–60
–70
–80
–90
Total Harmonic Distortion vs. Frequency
100
V
G = +10
V
R
(DIFFERENTIAL)
S
OUT
L
= 50
=
= 40V p-p
1k
15V
FREQUENCY – Hz
10k
L
= 200
100k
R
(DIFFERENTIAL)
L
, V
= 200
OUT
1M
= 40 V p-p
L
L
L
= 50
= 5
= 10
L
10M
= 25
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
coupling transformer with a greater than 1:1 turns ratio. The
low harmonic distortion of –66 dB @ 1 MHz into 200
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/ s 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
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.
V
4Vp-p
IN
15-Lead Through-Hole SIP (Y) and Surface-Mount
=
100
100
110
FUNCTIONAL BLOCK DIAGRAM
REFER TO PAGE 3 FOR 24-LEAD SOIC PACKAGE
Subscriber Line Differential Driver
TAB IS
+V
S
AMP2
AMP1
+15V
–15V
G = +10
499
499
World Wide Web Site: http://www.analog.com
AD815
AD815
1/2
NC = NO CONNECT
High Output Current
1/2
DDPAK(VR)
AD815
Differential Driver
V
40Vp-p
D
enable up to 12 back-terminated
=
R
R
1
2
= 15
= 15
TRANSFORMER
© Analog Devices, Inc., 1999
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1:2
AD815
R
120
NC
NC
NC
NC
+IN2
–IN2
OUT2
+V
–V
OUT1
–IN1
+IN1
NC
NC
NC
L
S
S
V
40Vp-p
OUT
=

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AD815-EB Summary of contents

Page 1

... ADSL, HDSL and VDSL. The AD815 differential slew rate of 900 V/ s 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 loads to be driven ...

Page 2

... LOAD LOAD MHz T – T MIN MAX T – T MIN MAX T – T MIN MAX –2– and R = 100 unless otherwise noted) LOAD AD815A V Min Typ Max Units S 15 100 120 MHz 5 90 110 MHz 15 40 MHz 5 10 MHz 15 800 900 ...

Page 3

... AD815AY – +85 C AD815AYS – +85 C AD815-EB CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD815 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 4

... AD815–Typical Performance Characteristics AD815 SUPPLY VOLTAGE – Figure 1. Input Common-Mode Voltage Range vs. Supply Voltage LOAD (SINGLE-ENDED SUPPLY VOLTAGE – Figure 2. Output Voltage Swing vs. Supply Voltage 100 LOAD RESISTANCE – (Differential – ...

Page 5

... LOAD CURRENT – Amps 15V S 30k 100k 300k 1M 3M 10M 30M 100M FREQUENCY – ±15V 100 FREQUENCY – MHz AD815 15V = V OUT 1.6 2.0 300M 14 ...

Page 6

... INPUT VOLTAGE NOISE 1 10 100 1k FREQUENCY – Hz Figure 13. Input Current and Voltage Noise vs. Frequency SIDE 562 562 OUT IN 562 30 1/2 AD815 562 20 10 10k 100k 1M FREQUENCY – Hz Figure 14. Common-Mode Rejection vs. Frequency 0 – 15V – 100 L –30 –40 –PSRR –50 +PSRR – ...

Page 7

... JUNCTION TEMPERATURE – 15V OUT | –V | OUT +V OUT R | –V | OUT –40 – JUNCTION TEMPERATURE – 15V –V OUT +V OUT –40 – JUNCTION TEMPERATURE – C AD815 + 100 = 150 100 80 100 ...

Page 8

... AD815 6 BACK TERMINATED LOADS (25 ) 0.04 0.03 0.02 PHASE 0.01 0.00 –0.01 –0.02 GAIN –0.03 –0. BACK TERMINATED LOADS (75 ) 0.010 0.005 PHASE 0.000 GAIN –0.005 –0.010 –0.015 GAIN –0.020 PHASE –0.025 –0.030 Figure 25. Differential Gain and Differential Phase (per Amplifier) – ...

Page 9

... GENERATOR 250ps R F 20ns 562 100 L 50ns Figure 38. 500 mV Step Response –1 –9– AD815 +15V 0 1/2 AD815 100 0 –15V = 250ps 562 F SIDE 100 140 S SIDE B 5V 100ns Figure 36 ...

Page 10

... AD815 SIDE A SIDE B 1V Figure 39 Step Response –1 THEORY OF OPERATION The AD815 is a dual current feedback amplifier with high (500 mA) output current capability. Being a current feedback amplifier, the AD815’s open-loop behavior is expressed as transimpedance –IN Z transimpedance behaves just as the open-loop voltage gain of a voltage feedback amplifier, that is, it has a large dc value and decreases at roughly 6 dB/octave in frequency ...

Page 11

... Figure 42. Output Offset Voltage POWER CONSIDERATIONS The 500 mA drive capability of the AD815 enables it to drive a 50 load p-p when it is configured as a differential driver. This implies a power dissipation ensure reliability, the junction temperature of the AD815 should be maintained at less than 175 C. For this reason, the AD815 will require some form of heat sinking in most applications ...

Page 12

... R provides no common-mode rejection. OUT 1 200 s Creating Differential Signals If only a single ended signal is available to drive the AD815 and a differential output signal is desired, several circuits can be used to perform the single-ended-to-differential conversion. 5ms One circuit to perform this is to use a dual op amp as a predriver that is configured as a noninverter and inverter ...

Page 13

... A second circuit that has none of the disadvantages mentioned 0 the above circuit creates a differential output voltage feedback op amp out of the pair of current feedback op amps in the AD815. 6 This circuit, drawn in Figure 53, can be used as a high power 1k differential line driver, such as required for ADSL (asymmetrical digital subscriber loop) line driving ...

Page 14

... J3 R10 R9 R21 R12 R18 Twelve Channel Video Distribution Amplifier The high current of the AD815 enables it to drive up to twelve standard 75 schematic of such an application. The input video signal is terminated in 75 (OPTIONAL noninverting inputs of both amplifiers of the AD815. Each 50 amplifier is configured for a gain of two to compensate for the divide-by-two feature of each cable termination ...

Page 15

... Figure 56. AD815 AVR Evaluation Board Assembly Drawing Figure 57. AD815 AVR Evaluation Board Layout (Component Side) REV. B Figure 58. AD815 AVR Evaluation Board Layout (Solder Side) –15– AD815 ...

Page 16

... AD815 15-Lead Surface Mount DDPAK (VR-15) 0.110 (2.79) 0.152 (3.86) 0.394 BSC 0.148 (3.76) (10.007) 0.137 (3.479) TYP 0.042 (1.066) TYP 0.080 (2.03 0.065 (1.65) 2 PLACES PIN 1 0.079 (2.006) 0.600 (15.24) DIA 0.146 (3.70) BSC 2 PLACES 0.138 (3.50) 0.798 (20.27) 0.778 (19.76) 0.182 (4.62) 0.172 (4.37) 0.100 (2.54) 0.031 (0.79) SEATING BSC 0.024 (0.60) PLANE 24-Lead Thermally Enhanced SOIC (RB-24) 0 ...

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