SAA8200HL Datasheet, PDF (36/71 Pages) NXP Semiconductors – Ensation Base integrated wireless audio baseband

Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
An overview of the maximum input voltages allowed against the presence of an external
resistor and the setting of the gain switch is given in Table 16; the power supply voltage is
assumed to be 3 V.
Table 16: Application modes using input gain stage
Resistor 12 kΩ
input gain switch
Present
0 dB
Present
6 dB
Absent
0 dB
Absent
6 dB
maximum input voltage
2 V (RMS)
1 V (RMS)
1 V (RMS)
0.5 V (RMS)
7.19.1.5 SDC
The Single-to-Differential Converter (SDC) consists of an inverting amplifier and a filter
network. The input is DC coupled, which means that decoupling must be done in front of
this module in case the input signal has a different common mode level than the SDC. For
optional biasing conditions, the SDC requires a sourcing bias current (into an NMOS
transistor) that is preferably proportional to the analog supply voltage.
7.19.2 Decimation filter (ADC)
The decimation from 128fs is performed in two stages (see Figure 8). The first stage
realizes sin(x)/x characteristics with decimation factor of 16. The second stage consists of
three half-band filters, each decimating by a factor of 2. The filter characteristics are
shown in Table 17.
Table 17: Filter characteristics
Description
Conditions
Value
Unit
Decimation filter
Pass band ripple
up to 0.45f_s
±0.02
dB
Stop band
from 0.55f_s
−60
dB
Overall gain
DC
3
dB
Dynamic range
up to 0.45f_s
140
dB
Droop
at 0.45f_s
−0.18
dB
DC blocking filter 1
Pass band ripple
none
dB
Pass band gain
0
dB
Droop
at 0.00045f_s
0.5
dB
DC attenuation
> 40
dB
Dynamic range
up to 0.45f_s
> 110
dB
DC blocking filter 2
Pass band ripple
none
dB
Pass band gain
0
dB
Droop
at 0.00045f_s
0.031
dB
DC attenuation
> 40
dB
Dynamic range
up to 0.45f_s
> 110
dB
SAA8200HL_2
Preliminary data sheet
Rev. 02 — 17 October 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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