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TMC2242CKTC1 Datasheet(PDF) 7 Page - Fairchild Semiconductor

Part # TMC2242CKTC1
Description  Digital Half-Band Interpolating/Decimating Filter 12-bit In/16-bit Out, 60 MHz
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

TMC2242CKTC1 Datasheet(HTML) 7 Page - Fairchild Semiconductor

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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 SI15 and SI14.
3. In -6 dB interpolation mode, the unsigned MSB is preceded by a 0 in SO15.
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 RND2-0
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 SO1 = 1, format is 8 bits, viz: SO15…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
SI11
SI10
S9
. . .
SI1
S0
Two’s Comp.
-20
2-1
2-2
. . .
2-10
2-11
Unsigned
20
2-1
2-2
. . .
2-10
2-11
Format
SO15
SO14
SO13
. . .
SO5
SO4
Two’s Comp.
-20
2-1
2-2
. . .
2-10
2-11
Unsigned1
20
2-1
2-2
. . .
2-10
2-11
-6 dB t.c.2
-20
-20
2-1
. . .
2-9
2-10
-6 dB Unsgn3
020
2-1
. . .
2-9
2-10
RND2-0
SO15
SO14
SO13
…SO8
SO7
SO6
SO5
SO4
SO3
SO2
SO1
SO0r
000
SO15
SO14
SO13
…SO8
SO7
SO6
SO5
SO4
SO3
SO2
SO1r
z
001
SO15
SO14
SO13
…SO8
SO7
SO6
SO5
SO4
SO3
SO2r
z
z
010
SO15
SO14
SO13
…SO8
SO7
SO6
SO5
SO4
SO3r
zzz
011
SO15
SO14
SO13
…SO8
SO7
SO6
SO5
SO4r
zzzz
1002
SO15
SO14
SO13
…SO8
SO7
SO6
SO5r
zzzzz
101
SO15
SO14
SO13
…SO8
SO7
SO6r
zzzzzz
110
SO15
SO14
SO13
…SO8
SO7r
zzzzzzz
111
Input
Interpolate -6 dB
All Other Modes
Interpretation
Unsigned
2’s Comp.
Unsigned
2’s Comp.
Unsigned
2’s Comp.
Unsigned
2’s Comp.
FFF
7FF
7FF81
3FF81
FFF01
7FF01
full-scale
full-scale +
C00
400
6000
2000
C000
4000
3/4-scale
1/2 scale +
801
001
4008
0008
8010
0010
1 LSB +
800
000
4000
0000
8000
0000
1/2-scale
Zero
7FF
FFF
3FF8
FFF8
7FF0
FFF0
1 LSB –
400
C00
2000
E000
4000
C000
1/4-scale
1/2-scale –
000
800
00001
C0001
00001
80001
zero
full-scale –


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