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PCM1742KE Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer PCM1742KE
Beschreibung 24-Bit/ 192kHz Sampling Enhanced Multilevel/ Delta-Sigma/ Audio DIGITAL-TO-ANALOG CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 22 Seiten
PCM1742KE Datasheet, Funktion
PCM1742
PCM1742
www.ti.com
24-Bit, 192kHz Sampling
Enhanced Multilevel, Delta-Sigma, Audio
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q 24-BIT RESOLUTION
q ANALOG PERFORMANCE (VCC = +5V):
Dynamic Range: 106dB typ (PCM1742KE)
100dB typ (PCM1742E)
SNR: 106dB typ (PCM1742KE)
100dB typ (PCM1742E)
THD+N: 0.002% typ (PCM1742KE)
0.003% typ (PCM1742E)
Full-Scale Output: 3.1Vp-p typ
q 4x/8x OVERSAMPLING DIGITAL FILTER:
Stopband Attenuation: –55dB
Passband Ripple: ±0.03dB
q SAMPLING FREQUENCY: 5kHz to 200kHz
q SYSTEM CLOCK: 128, 192, 256, 384, 512,
768fS with Auto Detect
q ACCEPTS 16-, 18-, 20-, AND 24-BIT AUDIO
DATA
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 AV RECEIVERS
q DVD MOVIE PLAYERS
q DVD ADD-ON CARDS FOR HIGH-END PCs
q DVD AUDIO PLAYERS
q HDTV RECEIVERS
q CAR AUDIO SYSTEMS
q OTHER APPLICATIONS REQUIRING 24-BIT
AUDIO
DESCRIPTION
The PCM1742 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 improved toler-
ance to clock jitter. The PCM1742 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 200kHz are supported. A full set of user-program-
mable functions are accessible through a 3-wire serial
control port that supports register write functions.
Copyright © 2000, Texas Instruments Incorporated
SBAS176
Printed in U.S.A. December, 2000






PCM1742KE Datasheet, Funktion
TYPICAL PERFORMANCE CURVES (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 (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 22
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 = 48kHz)
2 4 6 8 10 12 14 16 18 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. Conditions in 192kHz operation are: system clock = 128fS
and oversampling rate = 64fS of Register 18.
Supply-Voltage Characteristics
THD+N vs VCC (VDD = 3.3V)
10
60dB/192kHz, 384fS 60dB/96kHz, 384fS
1
60dB/44.1kHz, 384fS
0.1
0dB/192kHz, 384fS 0dB/96kHz, 384fS
DYNAMIC RANGE vs VCC (VDD = 3.3V)
110
108
44.1kHz, 384fS
106
96kHz, 384fS
104
192kHz, 384fS
102
0.01
0dB/44.1kHz, 384fS
100
98
0.001
2.4
2.7
3 3.3 3.6 3.9
VCC (V)
96
4
4.5 5 5.5
VCC (V)
6
6 PCM1742
SBAS176

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PCM1742KE pdf, datenblatt
REGISTER DEFINITIONS
Register 16
Register 17
ATx[7:0]
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
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. Changes in attenuation levels are made by incrementing or
decrementing, by one step (0.5dB), for every 8/fS time interval until the programmed attenuator setting is
reached. Alternatively, the attenuation level may be set to infinite attenuation, or mute. 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 “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. The OVER = 1 setting is
recommended when the oversampling rate is 192kHz (system clock is 128 or 192fS).
12 PCM1742
SBAS176

12 Page





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