SAA8200HL Datasheet, PDF (40/71 Pages) NXP Semiconductors – Ensation Base integrated wireless audio baseband

Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
Table 21: AGC time constant settings
AGC_TIME2 AGC_TIME1 AGC_TIME0 AGC setting
44.1 kHz sampling
8 kHz sampling
Attack time (ms) Decay time (ms) Attack time (ms) Decay time (ms)
0
0
0
11
100
61
551
0
0
1
16
100
88.2
551
0
1
0
11
200
61
1102
0
1
1
16
200
88.2
1102
1
0
0
21
200
116
1102
1
0
1
11
400
61
2205
1
1
0
16
400
88.2
2205
1
1
1
21
400
116
2205
7.20 Audio output
7.20.1 SDAC
The Stereo Digital-to-Analog Converter (SDAC) is a module with interpolation filters and
noise shaper for low frequency applications such as audio and TV-audio. In this section
the analog and digital part is described. The digital part consists of an interpolation filter
that increases the sample rate from 1f_s to 128f_s and a third order noise shaper that runs
on 128f_s or 256f_s.
The inputs to the SDAC are two 24-bit parallel input words, left and right, and a
synchronization signal (DIN_VALID) at f_s (f_s, the sample rate, is typically 44.1 kHz). The
output is a stereo analog signal (VOUT_LINEL and VOUT_LINER).
7.20.1.1 Features of the SDAC
• 24-bit data path with 16-bit coefficients
• Full FIR filter implementation for all of the upsampling filter
• 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 2f_s to 8f_s upsampling filter characteristics (sharp/slow-roll-off)
• Support for 2f_s and 8f_s input signals:
– 1f_s with full feature support, being de-emphasis, master volume control and soft
mute
– 2f_s input with master volume and mute support: required for double speed mode
– 8f_s input no features supported. This is intended for DSD support (grabbing data at
8f_s from an external DSD unit)
• Soft mute with a raised cosine function
• Controlled power-down sequence comprising a raised cosine mute function followed
by a DC ramp down to zero to avoid audible plops or clicks
• Integrated digital silence detection for left and right with selectable silence detection
time
• Polarity control
SAA8200HL_2
Preliminary data sheet
Rev. 02 — 17 October 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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