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TPA2005D1DRBR 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 TPA2005D1DRBR
상세설명  1.1 W MONO FILTER FREE CLASS D AUDIO POWER AMPLIFIER
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홈페이지  http://www.ti.com
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TPA2005D1DRBR 데이터시트(HTML) 9 Page - Texas Instruments

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TPA2005D1
SLOS369B – JULY 2002 – REVISED DECEMBER 2002
www.ti.com
9
APPLICATION INFORMATION
FULLY DIFFERENTIAL AMPLIFIER
The TPA2005D1 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 on the output 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. The fully differential TPA2005D1 can still be used with
a single-ended input; however, the TPA2005D1 should be used with differential inputs when in a noisy
environment, like a wireless handset, to ensure maximum noise rejection.
Advantages of Fully DIfferential Amplifiers
D Input-coupling capacitors not required:
The fully differential amplifier allows the inputs to be biased at voltage other than mid-supply. For
example, if a codec has a midsupply lower than the midsupply of the TPA2005D1, the common-mode
feedback circuit will adjust, and the TPA2005D1 outputs will still be biased at midsupply of the
TPA2005D1. The inputs of the TPA2005D1 can be biased from 0.5V to VDD – 0.8 V. If the inputs are
biased outside of that range, input-coupling capacitors are required.
D Midsupply bypass capacitor, C(BYPASS), not required:
The fully differential amplifier does not require a bypass capacitor. This is because any shift in the
midsupply affects both positive and negative channels equally and cancels at the differential output.
D 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.
COMPONENT SELECTION
Figure 26 shows the TPA2005D1 typical schematic with differential inputs and Figure 27 shows the
TPA2005D1 with differential inputs and input capacitors, and Figure 28 shows the TPA2005D1 with
single-ended inputs. Differential inputs should be used whenever possible because the single-ended inputs are
much more susceptible to noise.
Table 1. Typical Component Values
REF DES
VALUE
EIA SIZE
MANUFACTURER
PART NUMBER
RI
150 k
Ω (±0.5%)
0402
Panasonic
ERJ2RHD154V
CS
1
µF (+22%, –80%)
0402
Murata
GRP155F50J105Z
CI(1)
3.3 nF (
±10%)
0201
Murata
GRP033B10J332K
(1) CI is only needed for single-ended input or if VICM is not between 0.5 V and VDD – 0.8 V. CI = 3.3 nF
(with RI = 150 kΩ) gives a high-pass corner frequency of 321 Hz.


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