THS6226_15 Datasheet, PDF (1/21 Pages) Texas Instruments – Gated-Class H, Dual-Port VDSL2 Line Driver

THS6226
www.ti.com
SBOS499C – JANUARY 2011 – REVISED APRIL 2011
Gated-Class H, Dual-Port VDSL2 Line Driver
Check for Samples: THS6226
FEATURES
1
•23 Digitally-Adjustable Quiescent Current:
7.6mA to 23.0mA
• 1.0mA Bias Current Step
• Independent Voltage Boost and Main Line
Driver Disable
• Low-Power Line Termination Mode
• Full Capacitor Recharge: 3ms
• Low Input Voltage Noise Density:
6.3 nV/√Hz Input-Referred Voltage Noise
• Low MTPR Distortion:
70dB with +19.8dBm G.993.2—Profile 8b
• –91dBc HD3 (1MHz, 60Ω Differential)
• High Output Current: (383mA into 60Ω)
• Wide Output Swing: 40V_PP (+12V, 60Ω
Differential Load with a 1:1.4 Transformer)
• Wide Bandwidth: 125MHz
• Port-to-Port Separation of 90dB at 1MHz
• PSRR: 70dB at 1MHz for Good Isolation
APPLICATIONS
• Ideal for All VDSL2 Profiles
• Backwards-Compatible with
ADSL/ADSL2+/ADSL2++ Systems
DESCRIPTION
The THS6226 is a dual-port, class H,
current-feedback architecture, differential line driver
amplifier system ideal for xDSL systems. The device
is targeted for use in very-high-bit-rate digital
subscriber line 2 (VDSL2) line driver systems that
enable native DTM signals while supporting greater
than +20.5dBm line power (up to 8.5MHz) with good
linearity, supporting the G.993.2 VDSL2 8b profile. It
is also fast enough to support central-office
transmission of +14.5dBm line power up to 30MHz.
The unique architecture of the THS6226 allows
quiescent current to be minimal while still achieving
very high linearity. Differential distortion, under full
bias conditions, is –91dBc at 1MHz and reduces to
only –75dBc at 5MHz. Fixed multiple bias settings of
the amplifiers offer enhanced power savings for line
lengths where the full performance of the amplifier is
not required. To allow for even more flexibility and
power savings on all profiles, quiescent current is
digitally adjustable from 7.6mA to 23mA with a bias
current step of 1.0mA. For systems where additional
power savings while not transmitting are desired, the
THS6226 can be used in its line termination mode to
maintain impedance matching.
The wide output swing on +12V power supplies,
coupled with excellent current drive, allows for wide
dynamic headroom, keeping distortion minimal.
The THS6226 is available in a QFN-32 PowerPAD™
package.
IND
VIN+
1mF
VLL_CD
CAPL_CD
+12V
FBC
OUTD
THS6226
+12V
100kW
1:1.4
10.2W 33nF
Line:
100W
VIN-
INC
OUTC
FBD
VHH_CD
CAPH_CD
1mF
DATA
CLK
Typical VDSL2 Line Driver Circuit Using One Port of the THS6226
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments, Inc.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated