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PCM1718E Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer PCM1718E
Beschreibung Stereo Audio DIGITAL-TO-ANALOG CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 11 Seiten
PCM1718E Datasheet, Funktion
® PCM1718 ®
PCM1718E
TM Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q ACCEPTS 16- or 18-BIT I2S, OR 18-BIT
NORMAL INPUT DATA
q COMPLETE STEREO DAC:
8X Oversampling Digital Filter
Multi-Level Delta-Sigma DAC
Analog Low Pass Filter
Output Amplifier
q HIGH PERFORMANCE:
–90dB THD+N
96dB Dynamic Range
100dB SNR
q SYSTEM CLOCK: 256fs or 384fs
q WIDE POWER SUPPLY: +2.7V to +5.5V
q SELECTABLE FUNCTIONS:
Soft Mute
Digital De-emphasis
q SMALL 20-PIN SSOP PACKAGE
DESCRIPTION
The PCM1718 is a complete low cost stereo, audio
digital-to-analog converter, including digital interpo-
lation filter, 3rd-order delta-sigma DAC, and analog
output amplifiers. PCM1718 is fabricated on a highly
advanced 0.6µ CMOS process. PCM1718 accepts 18-
bit normal input data format, or 16- or 18-bit I2S data
format.
The digital filter performs an 8X interpolation func-
tion, as well as special functions such as soft mute and
digital de-emphasis.
PCM1718 is suitable for a wide variety of cost-sensitive
consumer applications where good performance is re-
quired. Its low cost, small size, and single power supply
make it ideal for BS tuners, keyboards, MPEG audio,
PCMCIA audio cards (ZV port), MIDI applications,
and set-top boxes.
BCKIN
LRCIN
DIN
MUTE
DM0
DM1
FORMAT
RSTB
Serial
Input
I/F
Mode
Control
I/F
Reset
8X Oversampling
Digital Filter with
Multi Function
Control
Multi-level
Delta-Sigma
Modulator
DAC
Multi-level
Delta-Sigma
Modulator
DAC
Output Amp
and
Low-pass
Filter
Output Amp
and
Low-pass
Filter
Clock/OSC Manager
Open Drain
Power Supply
VOUTL
D/C_L
VOUTR
D/C_R
ZERO
XTI XTO CLKO
VCC AGND VDD DGND
InternationalAirportIndustrialPark • MailingAddress:POBox11400,Tucson,AZ85734 • StreetAddress:6730S.TucsonBlvd.,Tucson,AZ 85706 • Tel:(520)746-1111 • Twx:910-952-1111
Internet:http://www.burr-brown.com/ • FAXLine:(800)548-6133(US/CanadaOnly) • Cable:BBRCORP • Telex:066-6491 • FAX:(520)889-1510 • ImmediateProductInfo:(800)548-6132
© 1996 Burr-Brown Corporation
PDS-1325A
PCPMrin1te7d 1in8UE.S.A. June, 1996
®






PCM1718E Datasheet, Funktion
SYSTEM CLOCK
The system clock for PCM1718 must be either 256fs or
384fs, where fs is the audio sampling frequency (typically
32kHz, 44.1kHz, or 48kHz). The system clock is used to
operate the digital filter and the modulator.
The system clock can be either a crystal oscillator placed
between XTI (pin 1) and XTO (pin 20), or an external clock
input to XTI. If an external system clock is used, XTO is
open (floating). Figure 1 illustrates the typical system clock
connections.
PCM1718 has a system clock detection circuit which auto-
matically senses if the system clock is operating at 256fs or
384fs. The system clock should be synchronized with LRCIN
(pin 4) clock. LRCIN (left-right clock) operates at the
sampling frequency fs. In the event these clocks are not
synchronized, PCM1718 can compensate for the phase dif-
ference internally. If the phase difference between left-right
and system clocks is greater than 6 bit clocks (BCKIN), the
synchronization is performed internally. While the synchro-
nization is processing, the analog output is forced to a DC
level at bipolar zero. The synchronization typically occurs in
less than 1 cycle of LRCIN.
DATA INTERFACE FORMATS
Digital audio data is interfaced to PCM1718 on pins 4, 5,
and 6—LRCIN (left-right clock), DIN (data input) and
BCKIN (bit clock). PCM1718 can accept both normal and
I2S data formats. Normal data format is MSB first, two’s
complement, right-justified. I2S data is compatible with
Philips serial data protocol. Figures 3 and 4 illustrate the
input data formats.
CLKO
CLKO
Internal System Clock
Internal System Clock
C1
X’tal
XTI
External Clock
XTI
C2
XTO
C1, C2 = typ 22pF
PCM1718E
CRYSTAL RESONATOR CONNECTION
FIGURE 1. Internal Clock Circuit Diagram and Oscillator Connection.
XTO
PCM1718E
EXTERNAL CLOCK INPUT
XTO pin = No Connection
tXTIH
1/256fs or 1/384fs
tXTIL
64% OF VDD
28% OF VDD
External System Clock High
External System Clock Low
tXTIH
tXTIL
10ns (min)
10ns (min)
FIGURE 2. External Clock Timing Requirements.
FUNCTIONAL CONTROLS
PCM1718 allows the user to control the input data format,
soft mute, and digital de-emphasis frequency. Table I illus-
trates the selectable functions:
FUNCTION
Data Input Format
Normal
I2S
De-emphasis
32kHz
44.1kHz
48kHz
Soft Mute
Reset
CONTROL PIN
FORMAT (Pin 14)
DM0, DM1 (Pins 16, 17)
MUTE (Pin 18)
RSTB (Pin 15)
TABLE I. Selectable Functions.
®
PCM1718E
6

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