Datenblatt-Suchmaschine für elektronische Bauteile |
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TPA6205A1 Datenblatt(PDF) 11 Page - Texas Instruments |
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TPA6205A1 Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 38 page _ + 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 11 Product Folder Links: SLOS490TPA6205A1 |
Ähnliche Teilenummer - TPA6205A1_17 |
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Ähnliche Beschreibung - TPA6205A1_17 |
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