LF2242 LODEV [LOGIC Devices Incorporated], LF2242 Datasheet - Page 3

• Manufacturer Part Number: LF2242
• Description: 12/16-bit Half-Band Interpolating/ Decimating Digital Filter
• Manufacturer: LODEV [LOGIC Devices Incorporated]

'R' indicates the half-LSB rounded bit (effective LSB position)
DEVICES INCORPORATED
RND
T
F
000
001
010
011
100
101
110
111
ABLE
IGURE
2-0
Inverted Offset Binary Output Format (TCO = 0, Non-interpolate)
Two’s Complement Output Format (TCO = 1, Non-interpolate)
Inverted Offset Binary Output Format (TCO = 0, Interpolate)
2. R
Two’s Complement Output Format (TCO = 1, Interpolate)
2. I
SO
X
X
X
X
X
X
X
X
15
NPUT AND
OUNDING
SO
X
X
X
X
X
X
X
X
(Sign)
14
(Sign)
(Sign)
(Sign)
(Sign)
–2
–2
Two’s Complement Input Format
–2
15
15
11
15
15
2
2
1
0
0
0
1
F
14 13 12
O
14 13 12
2
10 9
2
14 13 12
2
14 13 12
2
SO
2
ORMAT
–1
–1
–1
0
0
X
X
X
X
X
X
X
X
UTPUT
13
2
2
2
2
2
–2
–1
–2
–2
–1
2
2
2
2
2
SO
8
–3
–2
F
–3
–3
–2
X
X
X
X
X
X
X
X
ORMATS
12
2
2
2
2
2
3
3
3
3
3
–12
–12
–11
–11
–8
• • •
• • •
• • •
• • •
• • •
• • •
• • •
• • •
• • •
2
2
2
2
2
2
2
2
2
2
–13
–13
–12
–12
–9
2
2
2
2
2
1
1
SO
1
–14
1
–14
1
–10
–13
–13
X
X
X
X
X
X
X
X
2
2
8
2
2
2
0
0
0
–15
0
–15
0
–11
–14
–14
SO
3
X
X
X
X
X
X
X
R
7
SO
R
X
X
X
X
X
X
0
6
12/16-bit Half-Band Interpolating/
SO
X
X
X
X
X
R
0
0
5
RND
The rounding control inputs set the posi-
tion of the effective LSB of the output data
by adding a rounding bit to the internal
bit position that is one below that speci-
fied by RND
tive LSB position are subsequently ze-
roed (Table 2).
TCO — Two’s Complement Format
Control
The TCO input determines the format of
the output data. When TCO is HIGH, the
output data is presented in two’s comple-
ment format. When TCO is LOW, the
data is in inverted offset binary format
(all output bits are inverted except the
MSB — the MSB is unchanged).
OE — Output Enable
When the OE signal is LOW, the current
data in the output register is available on
the SO
outputs are in a high-impedance state.
SO
R
X
X
X
X
0
0
0
Decimating Digital Filter
Video Imaging Products
4
2-0
15-0
— Rounding Control
SO
X
X
X
R
0
0
0
0
pins. When OE is HIGH, the
3
2-0
. All bits below the effec-
SO
X
X
R
0
0
0
0
0
2
08/16/2000–LDS.2242-K
SO
R
X
0
0
0
0
0
0
1
LF2242
SO
R
0
0
0
0
0
0
0
0