TMC2242A Fairchild Semiconductor, TMC2242A Datasheet
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TMC2242A
Manufacturer Part Number
TMC2242A
Description
Digital Half-Band Interpolating/Decimating Filter 12-bit In/16-bit Out/ 60 MHz
Manufacturer
Fairchild Semiconductor
Datasheet
1.TMC2242A.pdf
(16 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TMC2242AR2C2
Manufacturer:
RAYTHEON
Quantity:
20 000
Features
• TMC2242A and TMC2242B are pin-compatible with
• User selectable interpolate gain, -6 dB or 0 dB (2242B)
• 30, 40 and 60 MHz speed grades
• User selectable 2:1 decimation, 1:2 interpolation, and
• Passband ripple < ± 0.01 dB
• Stopband rejection 59.4 dB from 0.28 to 0.50 x f
• Cascading two TMC2242A or TMC2242B meets
• Dedicated 12-bit 2's complement input data port and
• Two's complement or offset binary output format
• Built-in limiter prevents overflow
Description
The TMC2242A and TMC2242B are fixed-coefficient lin-
ear-phase half-band (low-pass) digital filters. They can be
used to halve or double the sampling rate of a digital signal.
When used as a decimating post-filter with a double-speed
oversampling A/D converter, they greatly reduce the cost and
complexity of anti-aliasing filters required ahead of the A/D
converter. When used as an interpolating pre-filter with a
double-speed oversampling D/A converter, the TMC2242A
and TMC2242B significantly reduce the design complexity
and production cost of reconstruction filters used on D/A
outputs.
Block Diagram
TMC2242A/TMC2242B
Digital Half-Band Interpolating/Decimating Filter
12-bit In/16-bit Out, 60 MHz
TMC2242
equal-rate filter modes
CCIR 601 low-pass filter requirement
16-bit output data port with user-selectable rounding from
9 to 16 bits
SYNC
SI
DEC
CLK
11-0
INT
12
Control
12
Decimate, Equal Rate 1-1-1-1
12
Interpolate 0-1-0-1
s
12
55 Tap
Filter
FIR
• Single +5 Volt power supply operation
• Small 44-Lead PLCC and 44-Lead MQFP
Applications
• Low-cost video filtering
• Chrominance bandwidth limiter
• Simple, inexpensive video D/A post-filters
• Reduced cost and complexity for A/D anti-aliasing filters
• High-performance digital low-pass filters
• Digital waveform reconstruction post-filtering
• Telecommunications
• Direct digital synthesis
• Radar
The TMC2242A and TMC2242B user selects the mode of
operation (decimate, interpolate, or equal-rate) and round-
ing. The TMC2242A and TMC2242B accept 12-bit 2's com-
plement data at up to 60 MHz and output saturated
(overflow-protected) 2's complement or offset binary data
rounded to from 9 to 16 bits. Within the speed grade I/O
limit, the output sample rate may be 1/2, 1, or 2 times the
input sample rate.
Round
Limit
3
and
16
16
www.fairchildsemi.com
16
65-2242A-01
RND
TCO
OE
SO
2-0
15-0
Rev. 1.2.0