MAX9480_05 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – Low-Power, Low-Distortion, Central-Office

19-2539; Rev 2; 9/05
Low-Power, Low-Distortion, Central-Office
ADSL Drivers and Integrated Drivers/Receivers
General Description
The MAX9480/MAX9481/MAX9482 low-power, low-dis-
tortion, class-G, high-current asymmetric digital sub-
scriber line (ADSL) drivers offer Rail-to-Rail^® output and
are ideal for ADSL in central-office applications.
Operating from ±5V and ±2.5V supplies, the drivers
incorporate two high-speed current-feedback preampli-
fiers driving two fixed-gain class-G buffers. The buffers
can deliver 20.4dBm average line power with a signal
crest factor of 5.3, and are designed to be directly DC or
AC bridged across a 1:2.5 transformer.
The MAX9480/MAX9481/MAX9482 employ an active line
termination scheme for incoming signals that eliminates
the need for back-match resistors, reducing line-card
power consumption at full rate to less than half of that
required by conventional class-AB line-driver circuits.
The MAX9480 includes a hybrid network and two low-
noise, fixed-gain-of-4.6V/V receive amplifiers. The part is
designed to recover the receive signal to the same level
as that of a conventional line interface circuit that incor-
porates a 1:2 transformer and standard back-matched
hybrid, without degrading signal-to-noise ratio (SNR) or
line-impedance sensitivity. The MAX9481 provides only
the preamplifiers and buffers without the hybrid or
receivers. The MAX9482 provides preamplifiers, buffers,
and uncommitted receive amplifiers. All devices have a
low-output-impedance shutdown function for saving
power when not transmitting.
At full-rate 20.4dBm discrete multitone data transmission
(DMT), the total dynamic power dissipation is only
680mW (MAX9480/MAX9482) or 655mW (MAX9481).
The MAX9480/MAX9481 are available in a 20-pin TSSOP
package and the MAX9482 is available in 28-pin TSSOP
and 32-pin QFN packages. All devices operate over the
extended -40°C to +85°C temperature range.
Applications
Full-Rate ADSL
HDSL
Central Office
DSLAM
Typical Operating Circuits appear at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Features
o Dissipate Only 655mW While Driving 20.4dBm
ADSL Full-Rate DMT-Modulated Signal
o Operate with ±5.0V and ±2.5V Power Supplies
o Complete ADSL Central-Office Line Interface
(MAX9480/MAX9482)
Two Preamplifiers plus Class-G Rail-to-Rail
Buffers
Active Line Termination plus Integrated Hybrid
(MAX9480)
Low-Noise Uncommitted Receive Amplifiers
(MAX9482)
Fixed-Gain Receive Amplifiers (MAX9480)
Low-Output-Impedance Shutdown Mode
o Preamplifiers, Buffers, and Active Line
Termination Functions (MAX9481)
o High-Output-Drive Capability
15V_P-P Differential Output Voltage Swing at
R_L = 16Ω
500mA Output-Drive
o Low Distortion: -71dBc Highest Harmonic at 1MHz
and 14V_P-P
o High Speed: 250V/µs Slew Rate, 80MHz -3dB
Bandwidth (G = -3)
o Thermal Shutdown
o Exposed Pads Improve Thermal Performance
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX9480EUP -40°C to +85°C 20 TSSOP-EP** U20E-4
MAX9481EUP -40°C to +85°C 20 TSSOP-EP U20E-4
MAX9482EUI -40°C to +85°C 28 TSSOP-EP U28E-4
MAX9482EGJ* -40°C to +85°C 32 QFN
*Future product—contact factory for availability.
**EP = Exposed pad.
G3277-2
Pin Configurations
TOP VIEW
POUT1 1
IN1- 2
IN1+ 3
RXP 4
DGND 5
SHDN 6
RXM 7
IN2+ 8
IN2- 9
POUT2 10
MAX9480
20 VLM
19 VLP
18 VCC
17 OUT1
16 VEE
15 VEE
14 OUT2
13 VCC
12 VLP
11 VLM
TSSOP
Pin Configurations continued at end of data sheet.
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