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TPA6205A1DRBT датащи(PDF) 11 Page - Texas Instruments

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номер детали TPA6205A1DRBT
подробное описание детали  1.25-W Mono Fully Differential Audio Power Amplifier
Download  38 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

TPA6205A1DRBT датащи(HTML) 11 Page - Texas Instruments

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background image
_
+
VDD
VO+
VO-
GND
To Battery
Cs
Bias
Circuitry
IN-
IN+
+
-
In From
DAC
SHUTDOWN
RI
RI
RF
RF
C(
)
BYPASS
(Optional)
SLOS490TPA6205A1
www.ti.com
SLOS490C – JULY 2006 – REVISED NOVEMBER 2015
8 Parameter Measurement Information
All parameters are measured according to the conditions described in the Specifications section.
9 Detailed Description
9.1 Overview
The TPA6205A1 is a 1.25-W mono fully differential amplifier. The devices operates in the range of 2.5 V to 5.5 V
and with at least 8-
Ω impedance load. It's fully differential input allows it to avoid using input coupling capacitors
and improves its RF-immunity.
9.2 Functional Block Diagram
9.3 Feature Description
9.3.1 Fully Differential Amplifiers
The TPA6205A1 is a fully differential amplifier with differential inputs and outputs. The fully differential amplifier
consists of a differential amplifier and a common-mode amplifier. The differential amplifier ensures that the
amplifier outputs a differential voltage that is equal to the differential input times the gain. The common-mode
feedback ensures that the common-mode voltage at the output is biased around VDD/2 regardless of the
common-mode voltage at the input.
9.3.1.1 Advantages of Fully Differential Amplifiers
Input coupling capacitors not required: A fully differential amplifier with good CMRR, like the TPA6205A1,
allows the inputs to be biased at voltage other than mid-supply. For example, if a DAC has mid-supply lower
than the mid-supply of the TPA6205A1, the common-mode feedback circuit adjusts for that, and the
TPA6205A1 outputs are still biased at mid-supply of the TPA6205A1. The inputs of the TPA6205A1 can be
biased from 0.5 V to VDD – 0.8 V. If the inputs are biased outside of that range, input coupling capacitors are
required.
Mid-supply bypass capacitor, C(BYPASS), not required: The fully differential amplifier does not require a bypass
capacitor. This is because any shift in the mid-supply affects both positive and negative channels equally and
cancels at the differential output. However, removing the bypass capacitor slightly worsens power supply
rejection ratio (kSVR), but a slight decrease of kSVR may be acceptable when an additional component can be
eliminated (see Figure 17).
Better RF-immunity: GSM handsets save power by turning on and shutting off the RF transmitter at a rate of
217 Hz. The transmitted signal is picked-up on input and output traces. The fully differential amplifier cancels
the signal much better than the typical audio amplifier.
Copyright © 2006–2015, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Links: SLOS490TPA6205A1


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