Datasheet > LF2242QC33

LF2242QC33

更新时间： 2024-09-23 22:12:31

品牌	Logo	应用领域
逻辑 - LOGIC		/
页数	文件大小	规格书
8页	138K
描述
12/16-bit Half-Band Interpolating/ Decimating Digital Filter

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LF2242QC33 数据手册

LF2242

DEVICES INCORPORATED

12/16-bit Half-Band Interpolating/

LF2242

Decimating Digital Filter

12/16-bit Half-Band Interpolating/

DEVICES INCORPORATED

Decimating Digital Filter

FEATURES

DESCRIPTION

The LF2242 is a linear-phase, half-

band (low pass) interpolating/

decimating digital filter that, unlike

intricate analog filters, requires no

tuning. The LF2242 can also signifi-

cantly reduce the complexity of

traditional analog anti-aliasing pre-

filters without compromising the

signal bandwidth or attenuation. This

can be achieved by using the LF2242

as a decimating post-filter with an

A/D converter and by sampling the

signal at twice the rate needed.

Likewise, by using the LF2242 as an

interpolating pre-filter with a D/A

converter, the corresponding analog

reconstruction post-filter circuitry can

be simplified.

sample rate. Once data is clocked in,

the 55-value output response begins

after 7 clock cycles and ends after 61

clock cycles. The pipeline latency

from the input of an impulse response

to its corresponding output peak is 34

clock cycles.

❑ 40 MHz Clock Rate

❑ Passband (0 to 0.22f_S)

Ripple: ±0.02 dB

❑ Stopband (0.28f_Sto 0.5f_S)

Rejection: 59.4 dB

❑ User-Selectable 2:1 Decimation or

1:2 Interpolation

The output data may be in either

two’s complement format or inverted

offset binary format. To avoid

truncation errors, the output data is

always internally rounded before it is

latched into the output register.

Rounding is user-selectable, and the

output data can be rounded from 16

bit values down to 8 bit values.

❑ 12-bit Two’s Complement Input

and 16-bit Output with

User-Selectable Rounding, 8- to

16-Bits

❑ User-Selectable Two’s Complement

or Inverted Offset Binary Output

Formats

❑ Three-State Outputs

❑ Replaces TRW/ Raytheon/

Fairchild TMC2242

DC gain of the LF2242 is 1.0015

(0.0126 dB) in pass-through and

decimate modes and 0.5007 (–3.004

dB) in interpolate mode. Passband

ripple does not exceed ±0.02 dB from

0 to 0.22f_Swith stopband attenuation

greater than 59.4 dB from 0.28f_Sto

0.5f_S(Nyquist frequency). The

❑ Package Styles Available:

• 44-pin PLCC, J-Lead

• 44-pin PQFP

The coefficients of the LF2242 are

fixed, and the only user programming

required is the selection of the mode

(interpolate, decimate, or pass-

through) and rounding. The asyn-

chronous three-state output enable

control simplifies interfacing to a bus.

response of the filter is –6 dB at 0.25f_S.

Data can be input into the LF2242 at a Full compliance with CCIR Recom-

rate of up to 40 million samples per mendation 601 (–12 dB at 0.25f_S) can

second. Within the 40 MHz I/O limit, be achieved by cascading two devices

the output sample rate can be one-

half, equal to, or two times the input

serially.

LF2242 BLOCK DIAGRAM

TCO RND2–0

55-TAP

FIR

FILTER

ROUND

AND LIMIT

CIRCUIT

INTERPOLATION

CIRCUIT

DECIMATION

CIRCUIT

SI11–0

SO15–0

CLK

TO ALL REGISTERS

INT DEC SYNC

Video Imaging Products

08/16/2000–LDS.2242-K

12 3 4 5 6 7 8

中文翻译

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与LF2242QC33相关器件

型号	品牌	获取价格	描述	数据表
LF2242QI25	ETC	获取价格	Digital Filter
LF2242QI33	ETC	获取价格	Digital Filter
LF2246	LOGIC	获取价格	11 x 10-bit Image Filter
LF2246GC15	LOGIC	获取价格	Digital Filter, 10-Bit, CMOS, CPGA120, CERAMIC, PGA-120
LF2246GC33	ETC	获取价格	Digital Filter
LF2246GM25	ETC	获取价格	Digital Filter
LF2246GM33	ETC	获取价格	Digital Filter
LF2246GMB25	ETC	获取价格	Digital Filter
LF2246GMB33	ETC	获取价格	Digital Filter
LF2246QC15	LOGIC	获取价格	11 x 10-bit Image Filter

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