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PCM1794A Schematic ( PDF Datasheet ) - Burr-Brown

Teilenummer PCM1794A
Beschreibung audio stereo digital-to-analog converter
Hersteller Burr-Brown
Logo Burr-Brown Logo 




Gesamt 30 Seiten
PCM1794A Datasheet, Funktion
BurrĆBrown Products
from Texas Instruments
PCM1794A
SLES117A – AUGUST 2004 – REVISED NOVEMBER 2006
24ĆBIT, 192ĆkHz SAMPLING, ADVANCED SEGMENT,
AUDIO STEREO DIGITALĆTOĆANALOG CONVERTER
www.DataSheet4U.com
FEATURES
D 24-Bit Resolution
D Analog Performance:
− Dynamic Range: 132 dB (9 V RMS, Mono)
129 dB (4.5 V RMS, Stereo)
127 dB (2 V RMS, Stereo)
− THD+N: 0.0004%
D Differential Current Output: 7.8 mA p-p
D 8× Oversampling Digital Filter:
− Stop-Band Attenuation: –130 dB
− Pass-Band Ripple: ±0.00001 dB
D Sampling Frequency: 10 kHz to 200 kHz
D System Clock: 128, 192, 256, 384, 512, or
768 fS With Autodetect
D Accepts 16- and 24-Bit Audio Data
D PCM Data Formats: Standard, I2S, and
Left-Justified
D Optional Interface Available to External
Digital Filter or DSP
D Digital De-Emphasis
D Digital Filter Rolloff: Sharp or Slow
D Soft Mute
D Zero Flag
D Dual-Supply Operation:
− 5-V Analog, 3.3-V Digital
D 5-V Tolerant Digital Inputs
D Small 28-Lead SSOP Package
APPLICATIONS
D A/V Receivers
D DVD Players
D Musical Instruments
D HDTV Receivers
D Car Audio Systems
D Digital Multitrack Recorders
D Other Applications Requiring 24-Bit Audio
DESCRIPTION
The PCM1794A is a monolithic CMOS integrated circuit
that includes stereo digital-to-analog converters and
support circuitry in a small 28-lead SSOP package. The
data converters use TI’s advanced segment DAC
architecture to achieve excellent dynamic performance
and improved tolerance to clock jitter. The PCM1794A
provides balanced current outputs, allowing the user to
optimize analog performance externally. Sampling rates
up to 200 kHz are supported.
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate
precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to
damage because very small parametric changes could cause the device not to meet its published specifications.
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.
Copyright 2006, Texas Instruments Incorporated






PCM1794A Datasheet, Funktion
PCM1794A
SLES117A – AUGUST 2004 – REVISED NOVEMBER 2006
Terminal Functions
TERMINAL
NAME
PIN
I/O
DESCRIPTIONS
AGND1 19 – Analog ground (internal bias)
AGND2 24 – Analog ground (internal bias)
AGND3L
27
– Analog ground (L-channel DACFF)
AGND3R
BCK
CHSL
DATA
DEM
16
6
2
5
3
– Analog ground (R-channel DACFF)
I Bit clock input (1)
I L-, R-channel select (1)
I Serial audio data input (1)
I De-emphasis enable (1)
DGND
FMT0
FMT1
8 – Digital ground
11 I Audio data format select (1)
12 I Audio data format select (1)
IOUTL+ 25 O L-channel analog current output +
IOUTL– 26 O L-channel analog current output –
IOUTR+ 17 O R-channel analog current output +
IOUTR– 18 O R-channel analog current output –
IREF
LRCK
MONO
20 – Output current reference bias pin
4 I Left and right clock (fS) input (1)
1 I Monaural mode enable (1)
MUTE
10 I Mute control (1)
RST
14 I Reset(1)
SCK
7 I System clock input(1)
VCC1
23 –
VCC2L
28 –
VCC2R 15 –
VCOML 22 –
VCOMR
21
VDD
9–
ZERO
13 O
(1) Schmitt-trigger input, 5-V tolerant
Analog power supply, 5 V
Analog power supply (L-channel DACFF), 5 V
Analog power supply (R-cahnnel DACFF), 5 V
L-channel internal bias decoupling pin
R-channel internal bias decoupling pin
Digital power supply, 3.3 V
Zero flag
www.ti.com
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PCM1794A pdf, datenblatt
PCM1794A
SLES117A – AUGUST 2004 – REVISED NOVEMBER 2006
AMPLITUDE
vs
FREQUENCY
0
www.ti.com
AMPLITUDE
vs
FREQUENCY
0
−20
−40
−60
−80
−100
−120
−140
−160
−20
−40
−60
−80
−100
−120
−140
−180
0 2 4 6 8 10 12 14 16 18 20
f – Frequency – kHz
−160
0
10 20 30 40 50 60 70 80 90 100
f – Frequency – kHz
NOTE: fS = 48 kHz, 32768 point 8 average, TA = 25°C, VDD = 3.3 V, NOTE: fS = 48 kHz, 32768 point 8 average, TA = 25°C, VDD = 3.3 V,
VCC = 5 V, measurement circuit is Figure 25.
VCC = 5 V, measurement circuit is Figure 25.
Figure 15. –60-db Output Spectrum, BW = 20 kHz Figure 16. –60-db Output Spectrum, BW = 100 kHz
TOTAL HARMONIC DISTORTION + NOISE
vs
INPUT LEVEL
10
1
0.1
0.01
0.001
0.0001
−100
−80 −60 −40 −20
Input Level – dBFS
NOTE: fS = 48 kHz, TA = 25°C, VDD = 3.3 V, VCC = 5 V,
measurement circuit is Figure 25.
Figure 17. THD+N vs Input Level
0
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