TMC2242CR2C1

更新时间： 2024-11-20 22:40:19

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		/
页数	文件大小	规格书
16页	91K
描述
Digital Half-Band Interpolating/Decimating Filter 12-bit In/16-bit Out, 60 MHz

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TMC2242CR2C1 数据手册

www.fairchildsemi.com

TMC2242C

Digital Half-Band Interpolating/Decimating Filter

12-bit In/16-bit Out, 60 MHz

Description

Features

The TMC2242C, a linear-phase low-pass half-band digital

ﬁlter with ﬁxed coefﬁcients, can be used to halve or double

the sampling rate of a digital signal. When used as a decimat-

ing post-ﬁlter with a double-speed oversampling A/D con-

verter, it greatly reduces the cost and complexity of the

required analog antialiasing pre-ﬁlters. When used as an

interpolating pre-ﬁlter with a double-speed oversampling

D/A converter, it greatly reduces the complexity and cost of

the necessary analog post-ﬁlter, particularly when its x/sin(x)

correction ﬁlter is engaged.

• Pin-compatible upgrade of TMC2242B

• User-selectable interpolate d.c. gain, 0 dB or -6 dB

• True unity d.c. gain in all “0 db” modes

• 40 MSPS performance in equal-rate ﬁlter modes

• 40 and 60 MSPS speed grades in all other modes

• User-selectable 2:1 decimation, 1:2 interpolation, and

equal-rate ﬁlter modes, plus unﬁltered bypass/delay mode

• Defeatable πx/sin(πx) compensation ﬁlter

• Passband ripple <0.014 dB

• Stopband rejection >56 dB

• Dedicated 12-bit two’s complement or unsigned input bus

• 16-bit two’s complement or unsigned output bus with

user-selectable rounding to 8 to 16 effective bits

• Programmable limiter prevents overﬂow or clips to

CCIR601 levels

The TMC2242C user selects the mode of operation (deci-

mate, interpolate, equal-rate, bypass, x/sin(x))and rounding.

The part can accept 12-bit two’s complement or unsigned

data at up to 60 MHz and can output saturated two’s comple-

ment or offset binary data rounded to from 8 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. Two-channel

modes permit it to interpolate or to decimate two multi-

• New double-latency modes match Y channel data ﬂow to

slower-sampled C and C data ﬂows

• New dual-channel interpolation and decimation for

YUV422

plexed data streams (such as video C and C ) jointly.

Applications

The ﬁlter response is ﬂat to within ±0.014 dB up to 0.21f

• Digital-to-Analog Converter Preﬁltering with optional

x/sinx correction

(e.g. 5.75MHz at a 27MHz clock rate), with stopband attenu-

ation greater than 56dB above 0.29f . Symmetric-coefﬁcient

• 1:2 interpolation

• Analog-to-Digital Converter Postﬁltering

• 2:1 decimation

ﬁlters such as the TMC2242C always have linear phase

response. Half-band response is -6 dB.

• Low-ripple low-pass (0 to 0.2 f ) ﬁlter

Fabricated on an advanced submicron CMOS process, the

TMC2242C is available in a 44-lead PLCC package. Perfor-

mance is guaranteed from 0 to 70°C and over a power supply

range of 4.75 to 5.25V.

Block Diagram

X/SIN(X)

FILTER

ROUND

LIMIT

ZERO

INSERT

FIR

FILT

11-0

15-0

DECIMATE

3-0

CONTROL

65-2242C-01

DEC INT SYNC TCO RND OE

Rev. 1.0.0

12 3 4 5 6 7...16

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