THS6184_16 Datasheet, PDF (1/39 Pages) Texas Instruments – DUAL-PORT, LOW-POWER DIFFERENTIAL xDSL LINE DRIVER AMPLIFIERS

THS6184
RHF 24-Pin
PWP 20-Pin
www.ti.com ................................................................................................................................................. SLLS635D – AUGUST 2005 – REVISED JANUARY 2009
DUAL-PORT, LOW-POWER DIFFERENTIAL
xDSL LINE DRIVER AMPLIFIERS
FEATURES
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•23 Trimmed Low-Power Consumption
– 4.2-mA/amp Full Bias Mode; 4.8 mA Max
– 3.2-mA/amp Mid Bias Mode; 3.7 mA Max
– 2.15-mA/amp Low Bias Mode; 2.5 mA Max
– Shutdown Mode and I_ADJ Pin for Variable
Bias
• Low Noise
– 3-nV/√Hz Voltage Noise
– 5.9-pA/√Hz Inverting Current Noise
– 1.2-pA/√Hz Noninverting Current Noise
• Low MTPR Distortion
– –74 dB with ADSL and ADSL2
– –71 dB with ADSL2+ and –70 dB with
ADSL2++
• –83 dBc THD (1 MHz, 100-Ω Differential)
• High Output Current: >415 mA (25-Ω Load)
• Wide Output Swing: 44 V_PP (±12-V, 200-Ω
Differential)
• Wide Bandwidth: 30 MHz (Gain = 5)
• Wide Power Supply Range: ±4 V to ±16 V
APPLICATIONS
• Ideal For Power Sensitive, High Density ADSL,
ADSL2, ADSL2+, and ADSL2++ Systems
CODEC
V _IN+
12 V
+
−
4.99 kΩ
30.1 Ω
DESCRIPTION
The THS6184 is a dual-port, low-power current
feedback differential line driver amplifier system ideal
for xDSL systems. Its extremely low-power
dissipation is ideal for ADSL, ADSL2, ADSL2+, and
ADSL2++ systems that must achieve high densities in
ADSL central office applications by combining two
ports, or four amplifiers, into one package.
The unique architecture of the THS6184 allows the
trimmed quiescent current to be much lower than
existing line drivers while still achieving high linearity.
Distortion at these low-power levels is good with
–83-dBc THD at 1 MHz with the low bias mode of 4.2
mA/port. Fixed and variable multiple-bias settings of
the amplifiers allows for enhanced power savings for
line lengths where the full performance of the
amplifier is not required.
The wide output swing of 44-V_PP differentially with
±12-V power supplies coupled with over 415-mA
current drive allow for wide dynamic range, keeping
distortion minimized. With a low 3-nV/√Hz voltage
noise coupled with a low 5.9-pA/√Hz inverting current
noise, the THS6184 increases the sensitivity of the
receive signals allowing for better margins and reach.
Line Power = ADSL2: 19.8 dBm
ADSL2+: 20.4 dBm
ADSL2++: 21.1 dBm
1:1
1.15 kΩ
0.1 μF
4.99 kΩ
1 μF
33 nF
Line:
100 Ω
−
CODEC
+
V _IN−
30.1 Ω
−12 V
Figure 1. Typical Line Driver Circuit Using One Port of THS6184
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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.
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All other trademarks are the property of their respective owners.
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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 © 2005–2009, Texas Instruments Incorporated