TMC2242A Fairchild Semiconductor, TMC2242A Datasheet

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)

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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

DEC

CLK

11-0

INT

Control

Decimate, Equal Rate 1-1-1-1

Interpolate 0-1-0-1

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

and

www.fairchildsemi.com

65-2242A-01

RND

TCO

2-0

15-0

Rev. 1.2.0

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