SM5876AM Seiko, SM5876AM Datasheet

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SM5876AM

Manufacturer Part Number
SM5876AM
Description
Manufacturer
Seiko
Datasheet

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SM5876AM
Manufacturer:
SIM
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Part Number:
SM5876AM
Manufacturer:
NPC
Quantity:
163
OVERVIEW
The SM5876AM is a 3rd-order
converter LSI for CD-ROM digital audio reproduc-
tion equipment. It incorporates an 8-times oversam-
pling digital filter, deemphasis filter, attenuator, and
soft mute circuits built-in., using NPC’s Molybde-
num-gate CMOS technology.
The SM5876AM operates from a 2.7 to 5.5 V supply,
and is available in 24-pin SSOPs.
FEATURES
NIPPON PRECISION CIRCUITS INC.
System clock
• 768fs (33.8688MHz)
• 384fs (16.9344MHz)
Crystal oscillator circuit built-in
Infinity-zero detector circuit built-in
MSB first, rear-packed serial data input format
( 64fs bit clock)
8-times oversampling digital filter
• 32 dB stopband attenuation
• ±0.05 dB passband ripple
3-line microcontroller interface for output mode
and attenuator control settings
16 output modes
Deemphasis filter operation
• 36 dB stopband attenuation
Attenuator
• 8-bit attenuator (linear 256 steps)
• Independent left/right-channel set function
• Soft mute function (approx. 1024/fs mute time)
• 3rd-order noise shaper
• 32fs oversampling
44.1 kHz sampling frequency
2.7 to 5.5 V operating supply voltage range (4.5 to
5.5 V operating supply voltage range with 768fs
system clock)
24-pin SSOP
Molybdenum-gate CMOS process
2-channel D/A converter
0.34 dB passband correction for 70 kHz LPF
0.09 to +0.23 dB deviation
0.34 dB passband correction for 70 kHz LPF
, 2-channel D/A
3rd-order
PINOUT
PACKAGE DIMENSIONS
Unit: mm
24-pin SSOP
0.7
AVDDL
DVDD
MLEN
10.05 0.20
10.20 0.30
TSTN
CKSL
DVSS
BCKI
CKO
LRCI
LON
, 2-channel D/A Converter
LO
DI
0.8
1
12
0.36 0.10
NIPPON PRECISION CIRCUITS—1
SM5876AM
24
13
0.50 0.20
MCK
MDT
RSTN
MUTEO
XVSS
XTO
XTI
XVDD
RO
AVDDR
RON
AVSS
0 10

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SM5876AM Summary of contents

Page 1

... LSI for CD-ROM digital audio reproduc- tion equipment. It incorporates an 8-times oversam- pling digital filter, deemphasis filter, attenuator, and soft mute circuits built-in., using NPC’s Molybde- num-gate CMOS technology. The SM5876AM operates from a 2.7 to 5.5 V supply, and is available in 24-pin SSOPs. FEATURES System clock • 768fs (33.8688MHz) • ...

Page 2

... LO O Left-channel analog output (+) 11 AVDDL Left-channel analog supply pin 12 LON O Left-channel analog output ( ) 13 AVSS Analog ground pin 14 RON O Right-channel analog output ( ) SM5876AM BCKI DI Input interface L R Filter & attenuation operation block Noise shaper operation block LON AVSS RON Description MUTEO ...

Page 3

... Pins MLEN, CKSL, BCKI, DI, LRCI, TSTN, MCK, MDT. Also applicable during supply switching. Recommended Operating Conditions 5 V operation Parameter Supply voltage range Supply voltage variation Operating temperature range SM5876AM Description = AV DDL DDR Symbol ...

Page 4

... Parameter Symbol 1 DVDD digital supply current I DDD 1 XVDD system clock supply current I DDX 1 AVDD analog supply current I DDA XTI HIGH-level input voltage V IH1 SM5876AM = CKSL = LOW (384fs) DD DDL DDR Symbol Rating 2 ...

Page 5

... System clock (XTI) Crystal Oscillator Parameter Symbol Oscillator frequency f OSC External clock input Parameter Symbol HIGH-level clock pulsewidth t CWH LOW-level clock pulsewidth t CWL Clock pulse cycle t XI SM5876AM Rating Condition min typ Clock input – – 0.3XV – DD 2.4 – – – 0 0.4 – ...

Page 6

... Parameter BCKI HIGH-level pulsewidth BCKI LOW-level pulsewidth BCKI pulse cycle DI setup time DI hold time Last BCKI rising edge to LRCI edge LRCI edge to first BCKI rising edge Serial input timing BCKI LRCI SM5876AM t CWL t XI Symbol min t 50 BCWH t 50 BCWL t ...

Page 7

... MLEN hold time MLEN level pulsewidth Rise time Fall time Control input timing MCK MDT MLEN MCK 2.4V MDT MLEN Reset Input (RSTN) Parameter RSTN LOW-level pulsewidth after supply rising edge SM5876AM Rating Symbol min t 140 MCWH t 140 MCWL t 280 MCY t 100 ...

Page 8

... Built-in analog LPF compensation 0.4535fs Overall frequency characteristic (deemphasis OFF 0.0 1.0 Passband characteristic (deemphasis OFF) 0.0 0.2 0.4 0.6 0.8 0.000 SM5876AM Frequency band @ fs = 44.1 kHz min 0 to 20.0 kHz 0.05 24.1 to 328.7 kHz 32 20.0 kHz – 2.0 3.0 4.0 5.0 Frequency (fs) 0.125 0.250 Frequency (fs) NIPPON PRECISION CIRCUITS—8 Attenuation (dB) ...

Page 9

... Built-in analog LPF compensation 0.4535fs Overall frequency characteristic (deemphasis ON 0.0 1.0 Passband characteristic (deemphasis ON 0.000 SM5876AM Frequency band 44.1 kHz min 0 to 20.0 kHz 0.09 24.1 to 328.7 kHz 36 20.0 kHz 2.0 3.0 4.0 5.0 Frequency (fs) 0.125 0.250 Frequency (fs) NIPPON PRECISION CIRCUITS—9 Attenuation (dB) typ max – ...

Page 10

... Signal-to-noise ratio S/N Channel separation Ch. Sep 1. The LSI output level = 0.3058AV Vrms Signal-to-noise is measured following a device reset, with DATA = 0 (DI = LOW). Under these conditions, the signal-to-noise ratio includes noise-shaper noise. SM5876AM = 16.9344 MHz, T OSC ...

Page 11

... Parameter Symbol Total harmonic distortion THD Output level Dynamic range Signal-to-noise ratio Channel separation Ch. Sep 1. Pins LO and RO should have an output load (min). SM5876AM Left Channel L/R Channel Selector Right Channel 10k Input Impedance NF Corporation 3346A 3346A left/right-channel selector switch N THRU ...

Page 12

... Measurement circuit SM5876AM AVSS LON AVDDL RON LO AVDDR TSTN RO LRCI XVDD DVDD XTI DI XTO BCKI XVSS DVSS MUTEO CKO RSTN CKSL MDT MLEN MCK NIPPON PRECISION CIRCUITS—12 ...

Page 13

... Mute is released on the 9th LRCI rising edge after RSTN goes HIGH. During this cycle, the timing reset can cause output noise to be generated. SM5876AM Note that the input clock accuracy and signal-to- noise ratio greatly influence the AC analog character- istics ...

Page 14

... Infinity-Zero Detector (analog mute control) Output (MUTEO) The SM5876AM outputs an infinity-zero detection output signal under the following circumstances. 1. When an infinity-zero occurs on both the left and right channels. 2. When an infinity-zero occurs in the input data for the channel set by the output mode setting. ...

Page 15

... When an attenuation value is set, the output gain decreases from the value set by the attenuation data until the gain is . Similarly for mute release, the output gain increases from the current value until the gain is 0 dB. Soft mute operation is shown in figure 3. SM5876AM PL3 Left-channel output Right-channel output 0 Mute Mute ...

Page 16

... MSB BCKI (64fs MAX) LRCI (MDT, MCK, MLEN) L channel Attenuation Data MCK MDATA LSB MLEN Data is recognized on the rising edge of MLEN. SM5876AM 1/fs 16 bit Right Channel LSB MSB R channel Output Attenuation Data Mode Control ...

Page 17

... Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. SM5876AM X'tal XTI CKO 44 ...

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