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LMH6678 Datasheet

  • LMH6678

  • Low Power 2-Channel Central-Office xDSL Driver

  • 17頁(yè)

  • NSC

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LMH6678 Low Power 2-Channel Central-Office xDSL Driver
December 2003
LMH6678
Low Power 2-Channel Central-Office xDSL Driver
General Description
The LMH6678 is a low power 2-channel differential output
driver utilizing dual current feedback op amps with a fixed
gain of A
V
= +5.4.
The LMH6678 utilizes high integration with low power con-
sumption to provide 580 mW at 19.8 dBm line output. The
LMH6678 can also be put into a listen mode to maintain the
termination for receive signals with 100 mW/Ch power dis-
sipation.
The LMH6678 has two separate 2-bit power control inputs
compatible with 3.3V CMOS for each channel that enable
independent control of line status. When the drivers for both
channels are shut off, power consumption drops to only 6
mW.
Thermal Shutdown function protects the IC from a shorted
line fault or system over temperature.
The LMH6678 is available in a 5mm x 4mm 24-lead LLP
package.
Features
AV
CC1
= AV
CC2
= +12V, AV
DD
= DV
DD
= +3.3V, T
A
= 25藲C,
2/3 Power Mode, Typical values unless specified.
n
Low power consumption
鈥?Line power P
LINE
= 100 mW
580 mW/Ch
鈥?No signal
185 mW/Ch
鈥?Listen mode
100 mW/Ch
鈥?Shutdown mode
3 mW/Ch
n
Power Supply
+12V
鈥?Analog (AV
CC1
, AV
CC2
)
+3.3V
鈥?Digital (DV
DD
, AV
DD
)
n
Output voltage swing
@
R
L
= 31鈩?/div>
鈥?Single ended
11.5 V
PP
鈥?Differential
23 V
PP
n
Multi tone power ratio, f = 500 kHz
72 dB
n
Output current
580 mA
n
Thermal shutdown protection
n
5mm x 4mm LLP package
n
Low thermal resistance
36藲C/W (胃
JA
)
n
Small PCB footprint
Application
n
Full rate ADSL, ADSL+, ADSL++ or G. Lite linecard
n
Remote DSLAMs
Block Diagram
20084037
漏 2003 National Semiconductor Corporation
DS200840
www.national.com

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