TMC2242AKTC datasheet, PDF - EEWORLD Datasheet

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TMC2242AKTC: Descriptiondigital half-band interpolating/decimating filter 12-bit In/16-bit out, 60 mhz; CategoryThe embedded processor and controller Microcontrollers and processors; File Size84KB，16 Pages; ManufacturerFairchild; Websitehttp://www.fairchildsemi.com/; Environmental Compliance

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TMC2242AKTC Overview

digital half-band interpolating/decimating filter 12-bit In/16-bit out, 60 mhz

TMC2242AKTC Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Parts packaging code	QFP
package instruction	QFP, QFP44,.5SQ,32
Contacts	44
Reach Compliance Code	compliant
ECCN code	3A991.A.2
boundary scan	NO
maximum clock frequency	30 MHz
External data bus width	12
JESD-30 code	S-PQFP-G44
length	10 mm
low power mode	NO
Number of terminals	44
Maximum operating temperature	70 °C
Minimum operating temperature
Output data bus width	16
Package body material	PLASTIC/EPOXY
encapsulated code	QFP
Encapsulate equivalent code	QFP44,.5SQ,32
Package shape	SQUARE
Package form	FLATPACK
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
power supply	5 V
Certification status	Not Qualified
Maximum seat height	2.35 mm
Maximum slew rate	150 mA
Maximum supply voltage	5.25 V
Minimum supply voltage	4.75 V
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal form	GULL WING
Terminal pitch	0.8 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	NOT SPECIFIED
width	10 mm
uPs/uCs/peripheral integrated circuit type	DSP PERIPHERAL, DIGITAL FILTER
Base Number Matches	1

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www.fairchildsemi.com

TMC2242A/TMC2242B

Digital Half-Band Interpolating/Decimating Filter

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

Features

• TMC2242A and TMC2242B are pin-compatible with

TMC2242

• 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

equal-rate ﬁlter modes

• Passband ripple <

0.01 dB

• Stopband rejection 59.4 dB from 0.28 to 0.50 x f

• Cascading two TMC2242A or TMC2242B meets

CCIR 601 low-pass ﬁlter requirement

• Dedicated 12-bit 2's complement input data port and

16-bit output data port with user-selectable rounding from

9 to 16 bits

• Two's complement or offset binary output format

• Built-in limiter prevents overﬂow

• 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

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.

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.

Block Diagram

11-0

55 Tap

FIR

Filter

Round

and

Limit

15-0

CLK

DEC

INT

SYNC

Control

Interpolate 0-1-0-1

Decimate, Equal Rate 1-1-1-1

TCO

RND

2-0

65-2242A-01

Rev. 1.2.0

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