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PDF PCM1723 Data sheet ( Hoja de datos )
| Número de pieza | PCM1723 | |
| Descripción | Stereo Audio DIGITAL-TO-ANALOG CONVERTER WITH PROGRAMMABLE PLL | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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® 49%
PCMF1P72O3E
PCM1723
TM Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
WITH PROGRAMMABLE PLL
FEATURES
q ACCEPTS 16-, 20-, OR 24-BIT INPUT DATA
q COMPLETE STEREO DAC: Includes Digital
Filter and Output Amp
q DYNAMIC RANGE: 94dB
q MULTIPLE SAMPLING FREQUENCIES:
16kHz, 22.05kHz, 24kHz
32kHz, 44.1kHz, 48kHz
64kHz, 88.2kHz, 96kHz
q PROGRAMMABLE PLL CIRCUIT:
256fS/384fS from 27MHz Master Clock
q NORMAL OR I2S DATA INPUT FORMATS
q SELECTABLE FUNCTIONS:
Soft Mute
Digital Attenuator (256 Steps)
Digital De-emphasis
q OUTPUT MODE: Left, Right, Mono, Mute
DESCRIPTION
The PCM1723 is a complete low cost stereo audio
digital-to-analog converter (DAC) with a phase-locked
loop (PLL) circuit included. The PLL derives either
256fS or 384fS system clock from an external 27MHz
reference frequency. The DAC contains a 3rd-order ∆Σ
modulator, a digital interpolation filter, and an analog
output amplifier. The PCM1723 can accept 16-, 20-, or
24-bit input data in either normal or I2S formats.
The digital filter performs an 8X interpolation func-
tion and includes selectable features such as soft mute,
digital attenuation and digital de-emphasis. The PLL
can be programmed for sampling at standard digital
audio frequencies as well as one-half and double
sampling frequencies.
The PCM1723 is ideal for applications which combine
compressed audio and video data such as DVD, DVD-
ROM, set-top boxes and MPEG sound cards.
BCKIN
LRCIN
DIN
ML
MC
MD
RSTB
Serial
Input
I/F
8X Oversampling
Digital Filter
with Function
Controller
Multi-level
Delta-Sigma
Modulator
Multi-level
Delta-Sigma
Modulator
Mode
Control
I/F
256fS/384fS
BPZ-Cont.
PLL OSC
DAC
DAC
Low-pass
Filter
Low-pass
Filter
Open Drain
Power Supply
VOUTL
CAP
VOUTR
ZERO
SCKO
MCKO XTI XTO
VCP PGND VCC AGND VDD DGND
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-1344B
Printed in U.S.A. January, 1998
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = +5V, RL = 44.1kHz, and fSYS = 384fS, 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 (32kHz)
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 (32kHz)
3628
7256
Frequency (Hz)
10884
DE-EMPHASIS ERROR (44.1kHz)
14512
4999.8375 9999.675 14999.5125
Frequency (Hz)
19999.35
DE-EMPHASIS ERROR (48kHz)
5442
10884
Frequency (Hz)
16326
21768
®
5 PCM1723
5 Page 
ML (pin 6)
MC (pin 7)
MD (pin 8)
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
FIGURE 8. Three-Wire Serial Interface.
ML
tMCH
tMCL
MC
tMCY
tMLH
tMHH
tMLS
tMLL
LSB
MD
tMDS
tMDH
MC Pulse Cycle Time
MC Pulse Width LOW
MC Pulse Width HIGH
MD Setup Time
MD Hold Time
ML Low Level Time
ML High Level Time
ML Setup Time
ML Hold Time
tMCY
tMCL
tMCH
tMDS
tMDH
tMLL
tMLH
tMLS
tMHH
SYSCLK: 1/256fS or 1/384fS
100ns (min)
50ns (min)
50ns (min)
30ns (min)
30ns (min)
30ns + 1SYSCLK (min)
30ns + 1SYSCLK (min)
30ns (min)
30ns (min)
1.4V
1.4V
1.4V
ML
MC
MD
FIGURE 9. Program Register Input Timing.
APPLICATION
CONSIDERATIONS
DELAY TIME
There is a finite delay time in delta-sigma converters. In A/D
converters, this is commonly referred to as latency. For a
delta-sigma D/A converter, delay time is determined by the
order number of the FIR filter stage, and the chosen sampling
rate. The following equation expresses the delay time of
PCM1723:
TD = 11.125 x 1/fS
For fS = 44.1kHz, TD = 11.125/44.1kHz = 251.4µs
Applications using data from a disc or tape source, such as
CD audio, CD-Interactive, Video CD, DAT, Minidisc, etc.,
generally are not affected by delay time. For some profes-
sional applications such as broadcast audio for studios, it is
important for total delay time to be less than 2ms.
OUTPUT FILTERING
For testing purposes all dynamic tests are done on the
PCM1723 using a 20kHz low pass filter. This filter limits
the measured bandwidth for THD+N, etc. to 20kHz. Failure
to use such a filter will result in higher THD+N and lower
SNR and Dynamic Range readings than are found in the
specifications. The low pass filter removes out of band
noise. Although it is not audible, it may affect dynamic
specification numbers.
®
11 PCM1723
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet PCM1723.PDF ] | |
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