參數(shù)資料
型號(hào)： TMC2242CKTC1
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 數(shù)字信號(hào)處理外設(shè)
英文描述： Digital Half-Band Interpolating/Decimating Filter 12-bit In/16-bit Out, 60 MHz
中文描述： 12-BIT, DSP-DIGITAL FILTER, PQFP44
封裝： MQFP-44
文件頁數(shù)： 7/16頁
文件大?。?/td> 89K
代理商： TMC2242CKTC1
PRODUCT SPECIFICATION
TMC2242C
7
Table 3a. Input Data Formats and Bit Weighting
Table 3b. Output Data Formats and Bit Weighting
Notes:
1. Inverted offset binary is the same as unsigned, except that all bits are complemented.
2. In -6 dB interpolation modes, the two’s complement sign bit is replicated in SI
15
and SI
14
.
3. In -6 dB interpolation mode, the unsigned MSB is preceded by a 0 in SO
15
.
4. A leading minus sign denotes the two’s complement sign bit.
5. In all operating modes except “interpolate -6 dB,” dc gain is exactly unity.
Table 4. Rounded LSBs as a function of RND
2-0
Note:
1. The “r” indicates that the trailing significant output bit has been rounded to the nearest 1/2 LSB. All output drivers at and
below the rounding bit are disabled, allowing the lower output bits to be used as control inputs.
2. If SO
1
= 1, format is 8 bits, viz: SO
15
…SO8r z…z.
Table 5. Steady-State Output Values and Limit Triggers
Notes:
1. Full-scale values are minima and maxima permitted by on-chip limiter. Transient overshoots arising from large input signal
transitions will be clipped to these limits.
Format
Two’s Comp.
Unsigned
SI
11
-2
0
2
0
SI
10
2
-1
2
-1
S
9
2
-2
2
-2
. . .
. . .
. . .
SI
1
2
-10
2
-10
S
0
2
-11
2
-11
Format
Two’s Comp.
Unsigned
1
-6 dB t.c.
2
-6 dB Unsgn
3
SO
15
-2
0
2
0
-2
0
0
SO
14
2
-1
2
-1
-2
0
2
0
SO
13
2
-2
2
-2
2
-1
2
-1
. . .
. . .
. . .
. . .
. . .
SO
5
2
-10
2
-10
2
-9
2
-9
SO
4
2
-11
2
-11
2
-10
2
-10
RND
2-0
000
001
010
011
100
2
101
110
111
SO
15
SO
15
SO
15
SO
15
SO
15
SO
15
SO
15
SO
15
SO
14
SO
14
SO
14
SO
14
SO
14
SO
14
SO
14
SO
14
SO
13
SO
13
SO
13
SO
13
SO
13
SO
13
SO
13
SO
13
…
…
…
…
…
…
…
…
SO
8
SO
8
SO
8
SO
8
SO
8
SO
8
SO
8
SO
8
SO
7
SO
7
SO
7
SO
7
SO
7
SO
7
SO
7
SO
7r
SO
6
SO
6
SO
6
SO
6
SO
6
SO
6
SO
6r
z
SO
5
SO
5
SO
5
SO
5
SO
5
SO
5r
z
z
SO
4
SO
4
SO
4
SO
4
SO
4r
z
z
z
SO
3
SO
3
SO
3
SO
3r
z
z
z
z
SO
2
SO
2
SO
2r
z
z
z
z
z
SO
1
SO
1r
z
z
z
z
z
z
SO
0r
z
z
z
z
z
z
z
Input
Interpolate -6 dB
Unsigned
7FF8
1
6000
4008
4000
3FF8
2000
0000
1
All Other Modes
Unsigned
FFF0
1
C000
8010
8000
7FF0
4000
0000
1
Interpretation
Unsigned
full-scale
3/4-scale
Unsigned
FFF
C00
801
800
7FF
400
000
2’s Comp.
7FF
400
001
000
FFF
C00
800
2’s Comp.
3FF8
1
2000
0008
0000
FFF8
E000
C000
1
2’s Comp.
7FF0
1
4000
0010
0000
FFF0
C000
8000
1
2’s Comp.
full-scale +
1/2 scale +
1 LSB +
Zero
1 LSB –
1/2-scale –
full-scale –
1/2-scale
1/4-scale
zero
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