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TPA2005D1-Q1 Datasheet(PDF) 9 Page - Texas Instruments

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Part # TPA2005D1-Q1
Description  1.4-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPA2005D1-Q1 Datasheet(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
FULLY DIFFERENTIAL AMPLIFIER
Advantages of Fully Differential Amplifiers
COMPONENT SELECTION
_
+
IN–
IN+
PWM
H–
Bridge
VO+
VO–
Internal
Oscillator
CS
To Battery
VDD
GND
Bias
Circuitry
RI
RI
+
Differential
Input
TPA2005D1
Filter-Free Class D
SHUTDOWN
TPA2005D1-Q1
SLOS474 – AUGUST 2005
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.
Input-coupling capacitors not required:
– The fully differential amplifier allows the inputs to be biased at a voltage other than midsupply. For
example, if a codec has a midsupply lower than the midsupply of the TPA2005D1, the common-mode
feedback circuit adjusts, and the TPA2005D1 outputs still is biased at midsupply of the TPA2005D1. The
inputs of the TPA2005D1 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.
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.
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.
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 needed only 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.
Figure 26. Typical TPA2005D1 Application Schematic With Differential Input for a Wireless Phone
9


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