參數(shù)資料
型號(hào): SAA7708H
廠商: NXP Semiconductors N.V.
元件分類: 數(shù)字信號(hào)處理
英文描述: Car Radio Digital Signal Processor
中文描述: 汽車無(wú)線電數(shù)字信號(hào)處理器
文件頁(yè)數(shù): 54/60頁(yè)
文件大?。?/td> 281K
代理商: SAA7708H
1998 May 19
54
Philips Semiconductors
Preliminary specification
Car Radio Digital Signal Processor
SAA7708H
Table 24
IIC_LEVEL_IAC register ($0FFC)
Table 25
IIC_IAC register ($0FFB)
20.7
Table definitions
Table 26
Level IAC theshold settings
NAME
BITS
DESCRIPTION
DEFAULT
BIT POS.
lev_iac_threshold
4
IAC level threshold setting (see Table 26). At
‘0000’ Level IAC is switched off
IAC level deviaton feed forward factor (see
Table 27)
IAC level stretch time (see Table 28)
the deviation threshold frequency setting of the
dynamic IAC (see Table 29)
enables FM frequency sweep dependent IAC
(1)
Fader volume regulator settings according Fig.
8 in position number 15
Level IAC on
at 0.063
0 periods
3 - 0
lev_iac_feedforward
2
5, 4
lev_iac_stretch
lev_dyn_iac_dev
2
2
13 periods
74 kHz
7, 6
9, 8
lev_en_dyn_iac
1
1
10
fader_vol
5
01111
15 - 11
NAME
BITS
DESCRIPTION
DEFAULT
BIT POS.
Threshold
feed_forward
Suppression
MPX_delay
AGC
GDC
IAC_trigger
3
3
3
2
1
3
1
Threshold sensitivity (see Table 31)
Deviation feed forward factor (see Table 32)
Stretch time suppression (see Table 33)
Delay settings MPX (see Table 34)
AGC set point 1/256 (1) or 1/128 (0)
Group delay compensation (see Table 35)
IAC output (1) or DSP_OUT2 output selection
0.031
0.01172
5 samples
5 periods
1/256
1200 ns
DSP
2 - 0
5 - 3
8 - 6
10, 9
11
14 - 12
15
IIC VALUE
THRESHOLD (DECIMAL VALUE)
THRESHOLD (BINARY VALUE)
Bit3
0
0
0
0
0
0
0
0
1
1
1
1
1
Bit2
0
0
0
0
1
1
1
1
0
0
0
0
1
Bit1
0
0
1
1
0
0
1
1
0
0
1
1
0
Bit0
0
1
0
1
0
1
0
1
0
1
0
1
0
Level IAC off
0.02
0.025
0.0316
0.04
0.05
0.063(prefix)
0.08
0.1
0.126
0.16
0.2
0.25
Level IAC off
0.0000010
0.0000011
0.0000100
0.0000101
0.0000110
0.0001000 (prefix)
0.0001010
0.0001101
0.0010000
0.0010100
0.0011010
0.0100000
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