Datasheet > SM5847AF

SM5847AF

更新时间： 2024-09-30 22:50:15

品牌	Logo	应用领域
NPC		外围集成电路 LTE PC
页数	文件大小	规格书
30页	337K
描述
High-fidelity Digital Audio, Multi-function Digital Filter

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SM5847AF 数据手册

SM5847AF

High-ﬁdelity Digital Audio, Multi-function Digital Filter

NIPPON PRECISION CIRCUITS INC.

OVERVIEW

The SM5847AF is a 4/8-times oversampling (inter-

polation), 2-channel, linear-phase FIR, multi-func-

tion digital ﬁlter for digital audio reproduction

equipment. It features independent left and right-

channel digital deemphasis ﬁlters and soft muting

function.

The internal system clock operates at either 192fs or

256fs selectable speed (where fs is the audio sam-

pling frequency). Plus, the divide-by 1, 2, or 4

counter settings means that external clocks of 768fs/

384fs/192fs (192fs input) and 1024fs/512fs/256fs

(256fs input) are supported.

The input/output interface supports input data in

16/18/20/24-bit words, and output data in

18/20/22/24-bit words in either 4-times or 8-times

oversampling selectable output mode.

The SM5847AF operates from a single 3 to 5 V sup-

ply, and is available in 44-pin QFP packages.

FEATURES

■ Left/right-channel (2-channel processing)

■ 4-times/8-times oversampling (interpolation)

• 8-times interpolation ﬁlter

- 3-stage linear-phase FIR conﬁguration

1st stage (fs to 2fs): 169-tap

• 2s complement, MSB ﬁrst

• 3 selectable formats

- LR alternating, 16/18/20/24-bit serial, right-

justiﬁed data

- LR alternating, 24-bit serial, left-justiﬁed

data

- LR simultaneous, 24-bit serial, left-justiﬁed

data

2nd stage (2fs to 4fs): 29-tap

3rd stage (4fs to 8fs): 17-tap

- ≤ ±0.00002 dB passband ripple (0 to

0.4535fs)

■ Output data format

- ≥ 117 dB stopband attenuation (0.5465fs to

7.4535fs)

• 2s complement, MSB ﬁrst, LR simultaneous

• 18/20/22/24-bit serial

• 4-times interpolation ﬁlter

- 2-stage linear-phase FIR conﬁguration

1st stage (fs to 2fs): 169-tap

2nd stage (2fs to 4fs): 29-tap

- ≤ ±0.00002 dB passband ripple (0 to

0.4535fs)

• BCKO burst (NPC format)

■ Dither round-off processing

• Dither round-off ON/OFF selectable

■ 25-bit internal data word length

■ Internal system clock

• 192fs/256fs selectable

- ≥ 116 dB stopband attenuation (0.5465fs to

3.4535fs)

■ Digital deemphasis

• Maximum operating frequency

192fs mode: 37 MHz max (5 V)

20.7 MHz max (3 V)

• IIR ﬁlter conﬁguration

256fs mode: 27.6 MHz max (5 V)

25 MHz max (3 V)

■ Jitter-free function

• Jitter-free/Sync mode selectable

■ Crystal oscillator circuit built-in

■ 3 to 5 V supply

• fs = 32kHz, 44.1kHz, 48kHz

• 2-channel independent ON/OFF control

■ 26 × 24-bit parallel multiplier/32-bit accumulator

■ Overﬂow limiter

■ Soft muting

• 2-channel independent ON/OFF control

■ Input data format

■ 44-pin plastic QFP

■ CMOS process

ORDERING INFORMATION

De vice

Packag e

SM5847AF

44-pin QFP

NIPPON PRECISION CIRCUITS—1

12 3 4 5 6 7...30

中文翻译

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