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PDF PCM1718E Data sheet ( Hoja de datos )
| Número de pieza | PCM1718E | |
| Descripción | Stereo Audio DIGITAL-TO-ANALOG CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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® PCM1718 ®
PCM1718E
TM Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q ACCEPTS 16- or 18-BIT I2S, OR 18-BIT
NORMAL INPUT DATA
q COMPLETE STEREO DAC:
8X Oversampling Digital Filter
Multi-Level Delta-Sigma DAC
Analog Low Pass Filter
Output Amplifier
q HIGH PERFORMANCE:
–90dB THD+N
96dB Dynamic Range
100dB SNR
q SYSTEM CLOCK: 256fs or 384fs
q WIDE POWER SUPPLY: +2.7V to +5.5V
q SELECTABLE FUNCTIONS:
Soft Mute
Digital De-emphasis
q SMALL 20-PIN SSOP PACKAGE
DESCRIPTION
The PCM1718 is a complete low cost stereo, audio
digital-to-analog converter, including digital interpo-
lation filter, 3rd-order delta-sigma DAC, and analog
output amplifiers. PCM1718 is fabricated on a highly
advanced 0.6µ CMOS process. PCM1718 accepts 18-
bit normal input data format, or 16- or 18-bit I2S data
format.
The digital filter performs an 8X interpolation func-
tion, as well as special functions such as soft mute and
digital de-emphasis.
PCM1718 is suitable for a wide variety of cost-sensitive
consumer applications where good performance is re-
quired. Its low cost, small size, and single power supply
make it ideal for BS tuners, keyboards, MPEG audio,
PCMCIA audio cards (ZV port), MIDI applications,
and set-top boxes.
BCKIN
LRCIN
DIN
MUTE
DM0
DM1
FORMAT
RSTB
Serial
Input
I/F
Mode
Control
I/F
Reset
8X Oversampling
Digital Filter with
Multi Function
Control
Multi-level
Delta-Sigma
Modulator
DAC
Multi-level
Delta-Sigma
Modulator
DAC
Output Amp
and
Low-pass
Filter
Output Amp
and
Low-pass
Filter
Clock/OSC Manager
Open Drain
Power Supply
VOUTL
D/C_L
VOUTR
D/C_R
ZERO
XTI XTO CLKO
VCC AGND VDD DGND
InternationalAirportIndustrialPark • MailingAddress:POBox11400,Tucson,AZ85734 • StreetAddress:6730S.TucsonBlvd.,Tucson,AZ 85706 • Tel:(520)746-1111 • Twx:910-952-1111
Internet:http://www.burr-brown.com/ • FAXLine:(800)548-6133(US/CanadaOnly) • Cable:BBRCORP • Telex:066-6491 • FAX:(520)889-1510 • ImmediateProductInfo:(800)548-6132
© 1996 Burr-Brown Corporation
PDS-1325A
PCPMrin1te7d 1in8UE.S.A. June, 1996
®
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = +5V, RL = 44.1kHz, fSYS = 384fs, and 18-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
0
–2
–4
–6
–8
–10
–12
0
0
–2
–4
–6
–8
–10
–12
0
DE-EMPHASIS FREQUENCY RESPONSE (32kHz)
5k 10k 15k 20k 25k
Frequency (Hz)
DE-EMPHASIS FREQUENCY RESPONSE (44.1kHz)
5k 10k 15k 20k 25k
Frequency (Hz)
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)
DE-EMPHASIS ERROR (48kHz)
19999.35
5442
10884
Frequency (Hz)
16326
21768
®
5 PCM1718E
5 Page 
Test Disk
CD
Player Digital
DAI
Lch
DEM-
PCM1718
Rch
Through
Shibasoku #725
11th-order
LPF
PGA
THD
Meter
0dB/60dB
30KHz LPF on
For test of S/N ratio and Dynamic Range, A-filter ON.
FIGURE 15. Test Block Diagram.
TEST CONDITIONS
Figure 15 illustrates the actual test conditions applied to
PCM1718 in production. The 11th-order filter is necessary
in the production environment for the removal of noise
resulting from the relatively long physical distance between
the unit and the test analyzer. In most actual applications, the
3rd-order filter shown in Figure 14 is adequate. Under
normal conditions, THD+N typical performance is –70dB
with a 30kHz low pass filter (shown here on the THD
meter), improving to –89dB when the external 20kHz 11th-
order filter is used. For cost-sensitive applications, a single
RC filter, as shown in Figure 18, may be adequate.
EVALUATION FIXTURES
DEM-PCM1718
This evaluation fixture is primarily intended for quick evalu-
ation of the PCM1718’s performance. DEM-PCM1718 can
accept either an external clock or a user-installed crystal
oscillator. All of the functions can be controlled by on-board
switches. DEM-PCM1718 does not contain a receiver chip
or an external low pass filter. DEM-PCM1718 requires a
single +2.7V to +5V power supply.
OUT-OF-BAND NOISE CONSIDERATIONS
Delta-sigma DACs are by nature very sensitive to jitter on
the master clock. Phase noise on the clock will result in an
increase in noise, ultimately degrading dynamic range. It is
difficult to quantify the effect of jitter due to problems in
synthesizing low levels of jitter. One of the reasons delta-
sigma DACs are prone to jitter sensitivity is the large
quantization noise when the modulator can only achieve two
discrete output levels (0 or 1). The multi-level delta-sigma
DAC has improved theoretical SNR because of multiple
output states. This reduces sensitivity to jitter. Figure 16
contrasts jitter sensitivity between a one-bit PWM type DAC
and multi-level delta-sigma DAC. The data was derived
using a simulator, where clock jitter could be completely
synthesized.
110
105
100
95
90
85
80
75
70
65
60
0
Multi-level
PWM
100 200 300 400 500 600
Clock Jitter (ps)
FIGURE 16. Simulation Results of Clock Jitter Sensitivity.
2
1
14.4ps
0
–1
2
48fs
FIGURE 17. Simulation Method for Clock Jitter.
PCM1718 Output
1kΩ
1800pF
fC = 88kHz
FIGURE 18. RC Output Filter.
®
11 PCM1718E
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet PCM1718E.PDF ] | |
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