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PCM1719 Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer PCM1719
Beschreibung Stereo Audio DIGITAL-TO-ANALOG CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 15 Seiten
PCM1719 Datasheet, Funktion
® 49%
PCMF17P19OE
PCM1719
TM Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q ACCEPTS 16- OR 18-BIT INPUT DATA
q COMPLETE STEREO DAC:
8X Oversampling Digital Filter
Multi-Level Delta-Sigma DAC
Analog Low Pass Filter
q ON-CHIP HEADPHONE AMPLIFIER
q HIGH PERFORMANCE:
–88dB THD+N
96dB Dynamic Range
100dB SNR
q SELECTABLE FUNCTIONS:
Digital De-emphasis
Digital Attenuation (256 Steps)
Soft Mute
Multiple Output Formats
q SYSTEM CLOCK: 256fS or 384fS
q SINGLE +5V POWER SUPPLY
q SMALL 28-PIN SSOP PACKAGE
DESCRIPTION
PCM1719 is a complete, low cost stereo audio digital-
to-analog converter (DAC) including a digital interpo-
lation filter, 3rd-order delta-sigma DAC, an analog
low-pass filter and output amplifier. PCM1719 also
has an on-chip stereo headphone amplifier.
PCM1719 can accept either 16-, or 18-bit input data.
The audio data input format can be either MSB-first,
right-justified or I2S. The system clock can be 256fS or
384fS. PCM1719 is fabricated on a highly advanced
0.6µs CMOS process, which delivers high perfor-
mance at very low power dissipation.
PCM1719 is ideal for applications which require head-
phone drivers such as CD-ROM drives, digital audio
workstations, portable CD players, and digital musical
instruments.
BCKIN
LRCIN
DIN
ML
MC
MD
RSTB
XTI
XTO
CLKO
Serial
Input
I/F
Mode
Control
I/F
Reset
Clock
and
OSC
Manager
8X Oversampling
Digital Filter
with Multi-Function
Control
Multi-level
Delta-Sigma
Modulator
DAC
Multi-level
Delta-Sigma
Modulator
DAC
Low-pass
Filter
Low-pass
Filter
BPZ-Cont.
PCM1719
Power Supply
Open Drain
Headphone Amp
Mute
Headphone Amp
Bias
VOUTL
COM
VOUTR
ZERO
PINL
POUTL
PCOM
PMUTE
POUTR
PINLR
VCC AGND VDD DGND PGND PVCC
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1996 Burr-Brown Corporation
PDS-1343A
Printed in U.S.A., November, 1996






PCM1719 Datasheet, Funktion
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VCC = VDD = PVCC = +5V, RL = 64, fSYS = 384fS, and 16-bit input data, unless otherwise noted.
DIGITAL FILTER
OVERALL FREQUENCY CHARACTERISTIC
0
–20
–40
–60
–80
–100
0 0.4536fS
1.3605fS 2.2675fS
Frequency (Hz)
3.1745fS
4.0815fS
0
–0.2
–0.4
–0.6
–0.8
–1
0
PASSBAND RIPPLE CHARACTERISTIC
0.1134fS
0.2268fS
0.3402fS
Frequency (Hz)
0.4535fS
0
–2
–4
–6
–8
–10
–12
0
DE-EMPHASIS FREQUENCY RESPONSE (3kHz)
5k
10k 15k
20k 25k
Frequency (Hz)
0
–2
–4
–6
–8
–10
–12
0
DE-EMPHASIS FREQUENCY RESPONSE (44.1kHz)
5k
10k 15k
20k 25k
Frequency (Hz)
0
–2
–4
–6
–8
–10
–12
0
DE-EMPHASIS FREQUENCY RESPONSE (48kHz)
5k
10k 15k
20k 25k
Frequency (Hz)
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
0
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
0
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
0
DE-EMPHASIS ERROR (3kHz)
3628
7256
Frequency (Hz)
10884
DE-EMPHASIS ERROR (44.1kHz)
14512
4999.8375 9999.675 14999.5125
Frequency (Hz)
DE-EMPHASIS ERROR (48kHz)
19999.35
5442
10884
Frequency (Hz)
16326
21768
®
PCM1719
6

6 Page









PCM1719 pdf, datenblatt
POWER SUPPLY
CONNECTIONS
PCM1719 has two power supply connections: digital (VDD)
and analog (VCC). Each connection also has a separate
ground. If the power supplies turn on at different times, there
is a possibility of a latch-up condition. To avoid this condi-
tion, it is recommended to have a common connection
between the digital and analog power supplies. If separate
supplies are used without a common connection, the delta
between the two supplies during ramp-up time must be less
than 0.6V.
An application circuit to avoid a latch-up condition is shown
in Figure 8.
A block diagram of the 5-level delta-sigma modulator is
shown in Figure 9. This 5-level delta-sigma modulator has
the advantage of stability and clock jitter sensitivity over the
typical one-bit (2 level) delta-sigma modulator.
The combined oversampling rate of the delta-sigma modu-
lator and the internal 8-times interpolation filter is 48fS for
a 384fS system clock, and 64fS for a 256fS system clock. The
theoretical quantization noise performance of the 5-level
delta-sigma modulator is shown in Figure 10.
Digital
Power Supply
Analog
Power Supply
VDD
DGND
VCC
AGND
FIGURE 8. Latch-up Prevention Circuit.
THEORY OF OPERATION
The delta-sigma section of PCM1719 is based on a 5-level
amplitude quantizer and a 3rd-order noise shaper. This
section converts the oversampled input data to 5-level delta-
sigma format.
20
0
–20
–40
–60
–80
–100
–120
–140
–160
0
3rd ORDER ∆Σ MODULATOR
5 10 15 20
Frequency (kHz)
FIGURE 10. Quantization Noise Spectrum.
25
In
8fS
18-Bit
+
+
Z–1
+
+
Z–1
+
+
Z–1
Out
48fS (384fS)
64fS (256fS)
FIGURE 9. 5-Level ∆Σ Modulator Block Diagram.
®
PCM1719
+
++
5-level Quantizer
4
3
2
1
0
12

12 Page





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