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PDF PCM1720 Data sheet ( Hoja de datos )
| Número de pieza | PCM1720 | |
| Descripción | Stereo Audio DIGITAL-TO-ANALOG CONVERTER MPEG2/AC-3 COMPATIBLE | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PCM1720 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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® 49%
PCMF1P7O20 ®
PCM1720
TM Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
MPEG2/AC-3 COMPATIBLE
FEATURES
q ACCEPTS 16-, 20-, OR 24-BIT INPUT DATA
q COMPLETE STEREO DAC: Includes Digital
Filter and Output Amp
q DYNAMIC RANGE: 96dB
q MULTIPLE SAMPLING FREQUENCIES:
16kHz to 96kHz
8X Oversampling at All Sampling
Frequencies
q SYSTEM CLOCK: 256fS/384fS
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 PCM1720 is a complete low cost stereo audio
digital-to-analog converter (DAC), operating off of a
256fS or 384fS system clock. The DAC contains a 3rd-
order ∆Σ modulator, a digital interpolation filter, and
an analog output amplifier. The PCM1720 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
PCM1720 can accept standard digital audio sampling
frequencies as well as one-half and double sampling
frequencies.
The PCM1720 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
Mode
Control
I/F
8X Oversampling
Digital Filter
with Function
Controller
Multi-level
Delta-Sigma
Modulator
DAC
Multi-level
Delta-Sigma
Modulator
DAC
Low-pass
Filter
Low-pass
Filter
BPZ-Cont.
256fS/384fS
Open Drain
Power Supply
VOUTL
CAP
VOUTR
ZERO
SCKI
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-1333B
Printed in U.S.A. August, 1996
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VCC = VDD = +5V, RL = 44.1kHz, 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
®
5 PCM1720
5 Page 
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
PCM1720:
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
professional applications such as broadcast audio for stu-
dios, it is important for total delay time to be less than 2ms.
OUTPUT FILTERING
For testing purposes all dynamic tests are done on the
PCM1720 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.
The performance of the internal low pass filter from DC to
24kHz is shown in Figure 7. The higher frequency rolloff of
the filter is shown in Figure 8. If the user’s application has
the PCM1720 driving a wideband amplifier, it is recom-
mended to use an external low pass filter. A simple 3rd-
order filter is shown in Figure 9. For some applications, a
passive RC filter or 2nd-order filter may be adequate.
INTERNAL ANALOG FILTER FREQUENCY RESPONSE
(20Hz~24kHz, Expanded Scale)
1.0
0.5
0
–0.5
–1.0
20
100
1k
Frequency (Hz)
10k 24k
FIGURE 7. Low Pass Filter Frequency Response.
INTERNAL ANALOG FILTER FREQUENCY RESPONSE
(10Hz~10MHz)
10
5
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
FIGURE 8. Low Pass Filter Wideband Frequency Response.
VSIN
+ 10kΩ
–
10kΩ
680pF
1500pF
OPA604
10kΩ
100pF
FIGURE 9. 3rd-Order LPF.
6
–14
–34
–54
–74
–94
100
GAIN vs FREQUENCY
Gain
Phase
1k 10k 100k
Frequency (Hz)
90
0
–90
–180
–270
–360
1M
®
11 PCM1720
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet PCM1720.PDF ] | |
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