THS4561 Datasheet, PDF (19/35 Pages) Texas Instruments – Low-Power, High Supply Range, 70-MHz, Fully Differential Amplifier

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9 Detailed Description
THS4561
SBOS874 – AUGUST 2017
9.1 Overview
The THS4561 is a fully differential amplifier featuring an extremely flexible supply voltage range of 2.85 V to 12.6
V, which makes this device an excellent choice for driving differential ADCs and buffering DAC outputs. This
device features a low-power mode with a unique active-pullup resistor that improves EMI reliability of the
shutdown pin when left floating. This pin draws very little bias current when enabled, but increases the bias
current as it nears the threshold point of shutdown. The increased current prevents the pin from unintentionally
turning the device off in the presence of EMI on the enable pin. Similar to other fully differential amplifiers, the
THS4561 also includes an output common-mode control pin that can be used to independently set the output
common mode to match that of an ADC or other load circuit.
9.2 Functional Block Diagram
(RGT Package) FB+
VS+
8.5
IN±
±
High-AOL +
Differential I/O
Amplifier ±
IN+
+
OUT+
OUT±
(RGT Package) FB±
8.5
VS±
PD
CMOS
Buffer
VS+
300 k
±
VCM
Error
Amplifier
+
VOCM
300 k
VS± ^{Copyright © 2017, Texas Instruments Incorporated}
Copyright © 2017, Texas Instruments Incorporated
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