SA58635 NXP Semiconductors, SA58635 Datasheet - Page 21

• Manufacturer Part Number: SA58635
• Manufacturer: NXP Semiconductors

NXP Semiconductors
13. Application information
SA58635_1
Product data sheet
Fig 25. Typical application
SOURCE
AUDIO
13.1 Power supply decoupling considerations
13.2 Input capacitor selection
2.2 F
1 F
1 F
1 F
1 F
The SA58635 is a stereo class-G headphone driver amplifier that requires proper power
supply decoupling to ensure the rated performance for THD+N and power efficiency. To
decouple high frequency transients, power supply spikes and digital noise on the power
bus line, a low Equivalent Series Resistance (ESR) capacitor, of typically 1 μF is placed
as close as possible to the AVDD terminals of the device. It is important to place the
decoupling capacitor at the power pins of the device because any resistance or
inductance in the PCB trace between the device and the capacitor can cause a loss in
efficiency. 10 μF or greater capacitors are usually not required due to high PSRR of the
SA58635.
The SA58635 does not require input coupling capacitors when used with a differential
audio source that is biased from −1.3 V to +1.3 V. In other words, the input signal must be
biased within the common-mode input voltage range. If high-pass filtering is required or if
it is driven using a single-ended source, input coupling capacitors are required.
The 3 dB cut-off frequency is created by the input coupling capacitors and the input
resistance of the SA58635. C
resistance (R
approximately 11.06 kΩ (minimum) to 28.47 kΩ (maximum) (see
INLP
INLN
INRP
INRN
HPVSS
CPP
SW
3.3 H
2.2 F
HPVDD
i
) of the SA58635 is a function of amplifier gain; it will vary from
CPN
2.3 V to 5.5 V
10 F
SA58635
Rev. 01 — 26 March 2010
SCL
I
2
C-bus
i
SDA
is the value of the input coupling capacitors. The input
AVDD
OUTR
SGND
AGND
OUTL
002aae120
2 × 25 mW class-G stereo headphone driver
IP5311CX5/LF
A1
C1
ASIP
ESD
A2
B2
C2
shield
Table
to headphone jack
SA58635
© NXP B.V. 2010. All rights reserved.
14).
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