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PCM1748E Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer PCM1748E
Beschreibung 24-Bit/ 96kHz Sampling Enhanced Multilevel/ Delta-Sigma/ Audio DIGITAL-TO-ANALOG CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 22 Seiten
PCM1748E Datasheet, Funktion
PCM1748
PCM1748
SBAS165A – MAY 2001
24-Bit, 96kHz Sampling
Enhanced Multilevel, Delta-Sigma, Audio
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q 24-BIT RESOLUTION
q ANALOG PERFORMANCE (VCC = +5V):
Dynamic Range: 106dB typ (PCM1748KE)
100dB typ (PCM1748E)
SNR: 106dB typ (PCM1748KE)
100dB typ (PCM1748E)
THD+N: 0.002% typ (PCM1748KE)
0.003% typ (PCM1748E)
Full-Scale Output: 3.1Vp-p typ
q 8x OVERSAMPLING DIGITAL FILTER:
Stopband Attenuation: –55dB
Passband Ripple: ±0.03dB
q SAMPLING FREQUENCY: 5kHz to 100kHz
q SYSTEM CLOCK: 256, 384, 512, 768fS with
Auto Detect
q ACCEPTS 16-, 18-, 20-, AND 24-BIT AUDIO
DATAzx
q DATA FORMATS: Standard, I2S, and
Left-Justified
q USER-PROGRAMMABLE MODE CONTROLS:
Digital Attenuation: 0dB to –63dB, 0.5dB/Step
Digital De-Emphasis
Digital Filter Roll-Off: Sharp or Slow
Soft Mute
Zero Flags for Each Output
q DUAL-SUPPLY OPERATION:
+5V Analog, +3.3V Digital
q 5V TOLERANT DIGITAL INPUTS
q SMALL SSOP-16 PACKAGE
q SAME PACKAGE SIZE AS SOP-8
APPLICATIONS
q A/V RECEIVERS
q DVD MOVIE PLAYERS
q DVD ADD-ON CARDS FOR HIGH-END PCs
q HDTV RECEIVERS
q CAR AUDIO SYSTEMS
q OTHER MULTICHANNEL AUDIO SYSTEMS
DESCRIPTION
The PCM1748 is a CMOS, monolithic, integrated circuit which
includes stereo Digital-to-Analog Converters (DACs) and support
circuitry in a small SSOP-16 package. The data converters utilize
Texas Instrument’s enhanced multilevel delta-sigma architecture
that employs fourth-order noise shaping and 8-level amplitude
quantization to achieve excellent dynamic performance and im-
proved tolerance to clock jitter. The PCM1748 accepts industry
standard audio data formats with 16- to 24-bit data, providing easy
interfacing to audio DSP and decoder chips. Sampling rates up to
100kHz are supported. A full set of user-programmable functions
are accessible through a 3-wire serial control port that supports
register write functions.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2000, Texas Instruments Incorporated






PCM1748E Datasheet, Funktion
TYPICAL CHARACTERISTICS (Cont.)
All specifications at TA = +25°C, VCC = 5.0V, VDD = 3.3V, system clock = 384fS (fS = 44.1kHz), and 24-bit input data, unless otherwise noted.
De-Emphasis and De-Emphasis Error (Cont.)
DE-EMPHASIS (fS = 44.1kHz)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
0 2 4 6 8 10 12 14 16 18 20
Frequency (kHz)
0.5
0.4
0.3
0.2
0.1
0.0
0.1
0.2
0.3
0.4
0.5
0
DE-EMPHASIS ERROR (fS = 44.1kHz)
2 4 6 8 10 12 14 16 18 20
Frequency (kHz)
DE-EMPHASIS (fS = 48kHz)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
0 2 4 6 8 10 12 14 16 18 20 22
Frequency (kHz)
DE-EMPHASIS ERROR (fS = 48kHz)
0.5
0.4
0.3
0.2
0.1
0.0
0.1
0.2
0.3
0.4
0.5
0 2 4 6 8 10 12 14 16 18 20 22
Frequency (kHz)
ANALOG DYNAMIC PERFORMANCE
All specifications at TA = +25°C, VCC = 5.0V, VDD = 3.3V, and 24-bit input data, unless otherwise noted.
Supply-Voltage Characteristics
10
1
0.1
0.01
0.001
0.0001
4
THD+N vs VCC (VDD = 3.3V)
60dB/96kHz, 384fS
60dB/44.1kHz, 384fS
0dB/96kHz, 384fS
0dB/44.1kHz, 384fS
4.5 5 5.5
VCC (V)
6
110
108
106
104
102
100
98
96
4
DYNAMIC RANGE vs VCC (VDD = 3.3V)
44.1kHz, 384fS
96kHz, 384fS
4.5 5 5.5
VCC (V)
6
6 PCM1748
SBAS165

6 Page









PCM1748E pdf, datenblatt
REGISTER DEFINITIONS
Register 16
Register 17
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT17 AT16 AT15 AT14 AT13 AT12 AT11 AT10
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT27 AT26 AT25 AT24 AT23 AT22 AT21 AT20
ATx[7:0]
Digital Attenuation Level Setting
where x = 1 or 2, corresponding to the DAC output VOUTL (x = 1) and VOUTR (x = 2).
Default Value: 1111 1111B
Each DAC channel (VOUTL and VOUTR) includes a digital attenuator function. The attenuation level may be
set from 0dB to –63dB, in 0.5dB steps. The attenuation data for each channel can be set individually.
The attenuation level may be set using the formula below.
Attenuation Level (dB) = 0.5 (ATx[7:0]DEC – 255)
where: ATx[7:0]DEC = 0 through 255
for: ATx[7:0]DEC = 0 through 128, the attenuator is set to infinite attenuation.
The following table shows attenuator levels for various settings.
ATx[7:0]
Decimal Value
1111 1111B
1111 1110B
1111 1101B
1000 0011B
1000 0010B
1000 0001B
1000 0000B
0000 0000B
255
254
253
131
130
129
128
0
Attenuator Level Setting
0dB, No Attenuation (default)
–0.5dB
–1.0dB
–62.0dB
–62.5dB
–63.0dB
Mute
Mute
Register 18
MUTx
OVER
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV OVER RSV RSV RSV RSV MUT2 MUT1
Soft Mute Control
Where x = 1 or 2, corresponding to the DAC output VOUTL (x = 1) and VOUTR (x = 2).
Default Value: 0
MUTx = 0
MUTx = 1
Mute Disabled (default)
Mute Enabled
The mute bits, MUT1 and MUT2, are used to enable or disable the Soft Mute function for the corresponding
DAC outputs, VOUTL and VOUTR. The Soft Mute function is incorporated into the digital attenuators. When
Mute is disabled (MUTx = 0), the attenuator and DAC operate normally. When Mute is enabled by setting
MUTx = 1, the digital attenuator for the corresponding output will be decreased from the current setting
to the infinite attenuation setting one attenuator step (0.5dB) at a time. This provides a quiet, “pop”-free
muting of the DAC output.
Oversampling Rate Control
Default Value: 0
OVER = 0
OVER = 1
64x Oversampling (default)
128x Oversampling
The OVER bit is used to control the oversampling rate of the delta-sigma DACs.
12 PCM1748
SBAS165

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