MAX9482 Datasheet PDF


Part Number

MAX9482

Description

Low-Power / Low-Distortion / Central-Office ADSL Drivers and Integrated Drivers/Receivers

Manufacture

Maxim

Total Page 18 Pages
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Download MAX9482 Datasheet PDF


Features Datasheet pdf 19-2539; Rev 1; 1/03 Low-Power, Low-Dis tortion, Central-Office ADSL Drivers an d Integrated Drivers/Receivers General Description The MAX9480/MAX9481/MAX9482 low-power, low-distortion, class-G, hi gh-current asymmetric digital subscribe r line (ADSL) drivers offer Rail-to-Rai l® output and are ideal for ADSL in ce ntral-office applications. Operating fr om ±5V and ±2.5V supplies, the driver s incorporate two high-speed current-fe edback preamplifiers driving two fixed- gain class-G buffers. The buffers can d eliver 20.4dBm average line power with a signal crest factor of 5.3, and are d esigned to be directly DC or AC bridged across a 1:2.5 transformer. The MAX948 0/MAX9481/MAX9482 employ an active line.
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MAX9482 Datasheet
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
15VP-P Differential Output Voltage Swing at
RL = 16
500mA Output-Drive
o Low Distortion: -71dBc Highest Harmonic at 1MHz
and 14VP-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.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.




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