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High Output Current Differential Driver AD815

FEATURES Flexible Configuration Differential Input & Output Driver or Two Single-Ended Drivers High Output Power Power Package 26 dBm Differential Line Drive for ADSL Application 40 V p Differential Output Voltage, RL = 50 ⍀ 500 mA Minimum Output Drive/Amp, RL = 5 ⍀ Thermally Enhanced SOIC 200 mA Minimum Output Drive/Amp, RL = 10 ⍀ Low Distortion –66 dB @ 1 MHz THD, R L = 200 ⍀, V OUT = 40 V p 0.05% & 0.45؇ Differential Gain & 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 & VDSL Line Interface Driver Coil or Transformer Driver CRT Convergence & Astigmatism Adjustment Video Distribution Amp Twisted Pair Cable Driver

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 on ± 15 V supplies. This can be increased further with the use of a –40 TOTAL HARMONIC DISTORTION – dBc

15

NC

13

NC

12

NC

11

+IN2

10

–IN2

9 8

TAB IS +VS

NC

14

OUT2 +VS

AD815

7

–VS

6

OUT1

5

–IN1

4 3

+IN1

2

NC

1

NC

NC

NC = NO CONNECT REFER TO PAGE 3 FOR 24-PIN SOIC PACKAGE

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% & 0.45° differential gain & phase into a load of 25 Ω enable up to 12 backterminated loads to be driven.

PRODUCT DESCRIPTION

–50

FUNCTIONAL BLOCK DIAGRAM 15-Pin Through-Hole SIP (Y) & Surface-Mount DDPAK(VR)

VS = ±15V G = +10 VOUT = 40V p

Three package styles are available, and all work over the industrial temperature range (–40°C to +85°C). Maximum driver performance is achieved with the power package available as through hole (Y) and surface-mount (VR), while the 24-pin SOIC (RB) driver performance is reduced due to the smaller package which has a higher thermal resistance. +15V

1/2 AD815

100Ω

–60

R1 = 15Ω

AMP1 –70 499Ω

–80

RL = 50Ω (DIFFERENTIAL)

VIN = 4Vp

RL = 200Ω (DIFFERENTIAL)

–90

G = +10

RL 120Ω

VD = 40Vp

VOUT = 40Vp

499Ω R2 = 15Ω

–100 –110 100

125Ω

100Ω

1k

10k 100k FREQUENCY – Hz

1M

10M

Total Harmonic Distortion vs. Frequency

AMP2 1/2 AD815

1:2 TRANSFORMER

–15V

Subscriber Line Differential Driver

REV. A 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.

© Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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