EA-OEM-306 Embedded Artists, EA-OEM-306 Datasheet - Page 43

• Manufacturer Part Number: EA-OEM-306
• Description: KIT LPC3152 SODIMM 66X48 200POS
• Manufacturer: Embedded Artists
• Type: MCUr

Specifications of EA-OEM-306

• Contents: Base Board, Cable, Headset, OEM Board, Serial Number
• For Use With/related Products: LPC3152
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
LPC3152_3154
Preliminary data sheet
7.2.2 Class AB headphone amplifier
7.2.3 Stereo Analog-to-Digital Converter (SADC) for Audio
The class AB headphone amplifier amplifies an analog input signal to levels appropriate
for a headphone output. Its input can be chosen from the Stereo Digital-to-Analog
Converter (SADC) or from the analog bypass from the tuner input (through the Analog
Volume Control (AVC) block). The class AB amplifier offers a solution in cases where high
output levels are required or when the headphone wire is also used as an antenna for
tuner reception.
This module has the following features:
The Stereo ADC can convert analog audio input signals into digital audio signals as
shown in
(ADC_VINL/ADC_VINR), stereo tuner-in (ADC_TINL/ADC_TINR), and mono microphone
in (ADC_MIC). These signals can be pre-processed by a Low-Noise Amplifier (LNA,
microphone input only), a Programmable Gain Amplifier (PGA), and a
Single-to-Differential Converter (SDC) before they arrive at the input of the actual SADC.
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Controlled power down sequence comprising a raised cosine mute function followed
by a DC ramp down to zero to avoid audible plops or clicks.
Digital dB-linear volume control in 0.25 dB steps.
Digital de-emphasis for 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz.
Selection for the up-sampling filter characteristics (sharp/slow roll-off).
Support for 2fs and 8fs input signals.
Soft mute with a raised cosine function.
Stereo headphone amplifier.
Three outputs: left, right, and a common signal ground output.
Common signal ground output enables DC coupling of headphone without electrolytic
capacitors.
16 Ω and higher output drive capability.
Individual power down modes for each output.
Programmable short-circuit current protection for each amplifier.
Additional input with Analog Volume Control (AVC) directly connected to the tuner
input pins.
Figure
All information provided in this document is subject to legal disclaimers.
12. The module has three input signals: stereo line-in
Rev. 0.12 — 27 May 2010
LPC3152/3154
© NXP B.V. 2010. All rights reserved.
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