THS6226A Datasheet, PDF (1/32 Pages) Texas Instruments – THS6226A Gated-Class H, Dual-Port VDSL2 Line Driver

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THS6226A
SBOS643A – APRIL 2014 – REVISED MAY 2014
THS6226A Gated-Class H, Dual-Port VDSL2 Line Driver
1 Features
•1 Digitally-Adjustable Quiescent Current:
9.4 mA to 24.8 mA
• Bias Current Step: 1.0 mA
• Independent Voltage Boost and Main Line Driver
Disable
• Low-Power Line Termination Mode
• Full Capacitor Recharge: 200 µs
• Low Input Voltage Noise Density:
6.5 nV/√Hz Input-Referred Voltage Noise
• Low MTPR Distortion:
70 dB with +19.8 dBm G.993.2—Profile 8b
• –83-dBc HD3 (1 MHz, 60-Ω Differential)
• High Output Current: 383 mA into 60 Ω
• Wide Output Swing: 40 V_PP (+12-V, 60-Ω
Differential Load with a 1:1.4 Transformer)
• Wide Bandwidth: 97 MHz
• Port-to-Port Separation: 90 dB at 1 MHz
• PSRR: 70 dB at 1 MHz for Good Isolation
2 Applications
• Ideal for All VDSL2 Profiles
• Backwards-Compatible with ADSL, ADSL2+, and
ADSL2++ Systems
3 Description
The THS6226A 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 20.5-dBm
line power (up to 8.5 MHz) with good linearity,
supporting the G.993.2 VDSL2 8b profile. The device
is also fast enough to support central-office
transmissions of 14.5-dBm line power up to 30 MHz.
The unique architecture of the device allows
quiescent current to be minimal while still achieving
very high linearity. Differential distortion, under full
bias conditions, is –91 dBc at 1 MHz and reduces to
only –75 dBc at 5 MHz. 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 7.6 mA to 23 mA with a bias
current step of 1.0 mA. For systems where additional
power savings while not transmitting are desired, the
device can be used in its line termination mode to
maintain impedance matching.
The wide output swing on 12-V power supplies,
coupled with excellent current drive, allows for wide
dynamic headroom, keeping distortion minimal. The
device is available in a VQFN-32 PowerPAD™
package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
THS6226A
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical VDSL2 Line Driver Circuit Using One Port
of the THS6226A
1mF
VLL_CD
CAPL_CD
IND
VIN+
+12V
FBC
OUTD
THS6226A ^+12V
100kW
1:n
0.2 × ^RL
33nF
RL
2
n
Power Consumption vs Tx
850
750
650
550
450
350
VIN-
INC
OUTC
FBD
VHH_CD
CAPH_CD
1mF
DATA
CLK
250
150
±6 ±3 0
3 6 9 12
Tx Power (dBm)
Single Channel
Dual channel
15 18 21
C009
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.