參數(shù)資料
型號(hào)： AM79C30AJC
廠商： ADVANCED MICRO DEVICES INC
元件分類(lèi)： 數(shù)字傳輸電路
英文描述： Digital Subscriber Controller⑩ (DSC⑩) Circuit
中文描述： DATACOM, DIGITAL SLIC, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 31/101頁(yè)
文件大?。?/td> 1607K
代理商： AM79C30AJC
Am79C30A/32A Data Sheet
31
As an example, in a hands-free application using an
electret requiring 24 dB of gain in the transmit path for
optimum performance. The typical implementation
would use 18 dB of GA and 6 dB of GX gain. The user
would then have a programmable range of +6 dB to –66
dB utilizing GX. Selection of these gain points is of
course, application specific, and will depend on the per-
formance requirements of the system.
Listings of the optimized programming values for vari-
ous levels are included in Appendix A. Values listed in
the recommended tables are still correct and will per-
form as stated. There is no need to convert to the ex-
tended values unless greater resolution is required.
Programmable Filter Coefficients and Equations
The frequency domain transfer function equation for
the X and R filters is:
where:
z = cos (wT) + i V sin(wT)
i = (–1)
1/2
w = frequency of input signal in Hz · 2pi
T = sample period in seconds (0.125 ms)
hj (j = 0,1,...7) = user-defined coefficients.
Each hj coefficient is defined by the following equation:
where each hj Coefficient Register pair has the follow-
ing format:
and Ai = –1 Si 2
–Mi
, (i=0,1,2,3).
The X and R filter coefficients are programmed using a
16-byte transfer with the format shown in Table 30.
Note:
AmMAP software, which calculates X and R filter coeffi-
cients, is available from Advanced Micro Devices. Contact
your local AMD Sales Office for more information.
Test Facilities
Three capabilities are provided for MAP operation ver-
ification.
MAP Analog Loopback
Signals sent in on AINA or AINB may be sent back out
to EAR1/EAR2 or LS1/LS2 by looping the MAP path in
the MUX. The MUX should be set up for Ba-to-Ba loop-
back by writing 33H to MCR1, MCR2, or MCR3. No
other MUX connections overriding Ba-to-Ba should be
programmed. This test allows the MAP analog and dig-
ital to be tested using a local signal source.
MAP Digital Loopback 1
This loopback mode connects the interpolator output to
the decimator input in place of the ADC output. This
mode allows verification from the S Interface or micro-
Table 28.
Recommended Ranges
Recommended and guaranteed
GX
0 to +12 dB plus infinite in 0.5 dB steps
GER
–10 to +18 dB plus infinite in 0.5 dB steps
GR
–12 to 0 dB plus infinite in 0.5 dB steps
STG
–18 to 0 dB plus infinite in 0.5 dB steps
Table 29.
Design Ranges
Limits by design
GX
–84.3 to 14.0 dB plus infinite in 0.1 dB steps
over most of the range
GER
–24.1 to 24.1 dB plus infinite in 0.1 dB steps
over most of the range
GR
–84.3 to 14.0 dB plus infinite in 0.1 dB steps
over most of the range
STG
–84.3 to 14.0 dB plus infinite in 0.1 dB steps
over most of the range
h
f
h
0
h
1
z
5
+
1
–
h
2
z
6
+
2
–
h
3
z
7
3
–
h
4
z
4
–
+
+
+
+
+
=
h
5
z
–
h
6
z
–
h
7
z
–
hj
A3 1
A2 1
A 1
A0
+
)
+
]
+
}
=
Byte
7
6 5 4
3
2 1 0
LSB
S1
M1
S0
M0
MSB
S3
M3
S2
M2
Table 30.
X/R Filter Format
Byte
Value
0
h0 LSB
1
h0 MSB
2
h1 LSB
4
h2 LSB
5
h2 MSB
6
h3 LSB
7
h3 MSB
8
h4 LSB
9
h4 MSB
10
h5 LSB
11
h5 MSB
12
h6 LSB
13
h6 MSB
14
h7 LSB
15
h7 MSB
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AM79C30AJC/D 制造商:Rochester Electronics LLC 功能描述:- Bulk
AM79C30AJC/DTR 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel
AM79C30AJC/E 制造商:Rochester Electronics LLC 功能描述:- Bulk
AM79C30AJC/E3 制造商:Rochester Electronics LLC 功能描述:- Bulk
AM79C30AJC/E4 制造商:Rochester Electronics LLC 功能描述:- Bulk
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