English
Language : 

THS6212 Datasheet, PDF (25/48 Pages) Texas Instruments – Differential, Line-Driver Amplifier
◁
www.ti.com
7 Detailed Description
THS6212
SBOS758 – MAY 2016
7.1 Overview
The THS6212 is a differential line-driver amplifier with a current-feedback architecture. The device is targeted for
use in line-driver applications (such as wide-band power-line communications) and is fast enough to support
transmissions of 14.5-dBm line power up to 30 MHz.
The THS6212 is designed as a single-channel solution that can be a drop-in replacement for dual-channel
footprint packages. The package pinout is compatible with the pinout of the THS6214 dual, differential line driver,
and provides an alternative for systems that only require a single-channel device.
The architecture of the THS6212 is designed to provide maximum flexibility with multiple bias settings that are
selectable based on application performance requirements, and also provides an external current pin (IADJ) to
further adjust the bias current to the device. The wide output swing (43.2 VPP) and high current drive (416 mA) of
the THS6212 make the device ideally suited for high-power, line-driving applications.
7.2 Functional Block Diagram
VS+
D1 IN+
D1
THS6212
D1 OUT
BIAS-1
BIAS-2
IADJ
BIAS
D1 FB
GND
D2 FB
D2 IN+
D2
THS6212
D2 OUT
VS-
Copyright © 2016, Texas Instruments Incorporated
7.3 Feature Description
7.3.1 Output Current and Voltage
The THS6212 provides output voltage and current capabilities that are unsurpassed in a low-cost, monolithic op
amp. Under no-load conditions at 25°C, the output voltage typically swings closer than 1.1 V to either supply rail;
tested at 25°C, the swing limit is within 1.4 V of either rail into a 100-Ω differential load. Into a 25-Ω load (the
minimum tested load), the amplifier delivers more than ±408-mA continuous and greater than ±1-A peak output
current.
These commonly occurring specifications, though familiar in the industry, only consider voltage and current limits
separately. In many applications, the voltage times current (or V-I product) is more relevant to circuit operation;
see the Output Voltage and Current Limitations plot (Figure 13) in the Typical Characteristics section. The X- and
Y-axes of this graph show the zero-voltage output current limit and the zero-current output voltage limit,
respectively. The four quadrants give a more detailed view of the THS6212 output drive capabilities, noting that
the graph is bounded by a safe operating area of a 1-W maximum internal power dissipation. Superimposing
resistor load lines onto the plot illustrates that the THS6212 can drive ±10.9 V into 100 Ω or ±10.5 V into 50 Ω
without exceeding the output capabilities or the 1-W dissipation limit. A 100-Ω load line (the standard test circuit
load) illustrates the full ±12-V output swing capability, as provided in the Electrical Characteristics tables. The
minimum specified output voltage and current over temperature are set by worst-case simulations at the cold
temperature extreme. Only at cold startup do the output current and voltage decrease to the numbers given in
the Electrical Characteristics tables. When the output transistors deliver power, the junction temperature
increases, decreasing the VBEs (increasing the available output voltage swing), and increasing the current gains
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: THS6212
Submit Documentation Feedback
25
 ▷