500 mA Differential Driver and
Dual Low Noise (VF) Amplifiers
a
AD816*
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Flexible Configuration
Two Low Noise Voltage Feedback Amplifiers with
High Current Drive, Ideal for ADSL Receivers or
Drivers for Low Impedance Loads such as CRT Coils
Two High Current Drive Amplifiers, Ideal for an ADSL
Differential Driver or Single Ended Drivers for Low
Impedance Loads such as CRT Coils
Thermal Overload Protection
15
NC
14
13
12
11
10
9
OUT2 RECEIVER
–IN2 RECEIVER
+IN2 RECEIVER
+IN2 DRIVER
TAB IS
+V
S
B
A
–IN2 DRIVER
OUT2 DRIVER
+V
–V
8
S
+V
–V
S
7
S
S
6
OUT1 DRIVER
–IN1 DRIVER
CURRENT FEEDBACK AMPLIFIERS/DRIVERS
High Output Drive
5
4
+IN1 DRIVER
26 dBm Differential Line Drive for ADSL Transmitters
40 V p-p Differential Output Voltage, RL = 50 ⍀ @ 1 MHz
500 mA Continuous Current, RL = 5 ⍀
1 A Peak Current, 1% Duty Cycle, RL = 15 ⍀ for DMT
Low Distortion
3
+IN1 RECEIVER
–IN1 RECEIVER
OUT1 RECEIVER
2
1
NC = NO CONNECT
–68 dB @ 1 MHz THD, RL = 100 ⍀, VO = 40 V p-p
High Speed
120 MHz Bandwidth (–3 dB)
1500 V/s Differential Slew Rate, VO = 10 V p-p, G = +5
70 ns Settling Time to 0.1%
The two high output drive amplifiers are capable of supplying
a minimum of 500 mA continuous output current and up to
1A peak output current, and when configured differentially,
40 V p-p differential output swing can be achieved on ±15 V
supplies into a load of 50 Ω. The drivers have 120 MHz of
bandwidth and 1,500 V/µs of differential slew rate while
featuring total harmonic distortion of –68 dB at 1 MHz into a
100 Ω load, specifications required for high frequency telecom-
munication subscriber line drivers.
VOLTAGE FEEDBACK AMPLIFIERS/RECEIVERS
High Input Performance
4 nV/√Hz Voltage Noise
15 mV Max Input Offset Voltage
Low Distortion
The low noise voltage feedback amplifiers are fully independent
and can be configured differentially for use as receiver amplifi-
ers within a subscriber line hybrid interface or individually for
signal conditioning or filtering. The low noise of 4 nV/√Hz and
distortion of –68 dB at 1 MHz enable low level signals to be
resolved and amplified in the presence of large common-mode
voltages. 100 MHz of bandwidth and 180 V/µs of slew rate
combined with a load drive capability of 70 mA enable these
amplifiers to drive passive filters and low inductance coils. The
AD816 has thermal overload protection for system reliability
and is available in low thermal resistance power packages. The
AD816 operates over the industrial temperature range (–40°C
to +85°C).
–68 dB @ 1 MHz THD, VO = 10 V p-p, RL = 200 ⍀
High Speed
100 MHz Bandwidth (–3 dB)
180 V/s Slew Rate
High Output Drive
70 mA Output Current Drive
APPLICATIONS
ADSL, VDSL and HDSL Line Interface Driver and Receiver
CRT Convergence and Astigmatism Adjustment
Coil and Transformer Drivers
Composite Audio Amplifiers
PRODUCT DESCRIPTION
The AD816 consists of two high current drive and two low
noise amplifiers. These can be configured differentially for driv-
ing low impedance loads and receiving signals over twisted pair
cable or could be used independently for single ended driving
application such as correction circuits within high resolution
CRT Monitors.
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
Fax: 781/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 1999
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