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PCM58K Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer PCM58K
Beschreibung Precision/ 18-Bit Monolithic Audio DIGITAL-TO-ANALOG CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 6 Seiten
PCM58K Datasheet, Funktion
® PCM58P
Precision, 18-Bit Monolithic Audio
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q 18-BIT MONOLITHIC AUDIO D/A
CONVERTER
q VERY LOW MAX THD+N: –96dB Without
External Adjustment; PCM58P-K
q SERIAL INPUT FORMAT 100%
COMPATIBLE WITH INDUSTRY STD
16-BIT PCM56P
q VERY FAST SETTLING, GLITCH-FREE
CURRENT OUTPUT (200ns)
q LOW-NOISE SCHMITT TRIGGER LOGIC
INPUT CIRCUITRY
q COMPLETE WITH REFERENCE
q RELIABLE PLASTIC 28-PIN DIP
PACKAGE
DESCRIPTION
The PCM58P is a complete, precision 18-bit digital-
to-analog converter with ultra-low distortion over a very
wide frequency range. The latched serial input data
format of the PCM58P is totally based on the widely
successful 16-bit PCM56P format (with the addition of
two more data bits). The PCM58P features a very low
noise and fast settling current output.
The PCM58P comes in a 28-pin plastic DIP package.
A provision is made for external adjustment of the four
MSBs to further improve the PCM58P’s specifications,
if desired. Applications include very low distortion
frequency synthesis and high-end consumer and pro-
fessional digital audio applications.
Clock
Latch Enable
Data
Control
Logic
Reference
18-Bit
IOUT DAC
Serial-to-Parallel
Shift Register
VREF
MSB Adj
IOUT
RF
RF
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
PCM58P©1988 Burr-Brown Corporation
PDS-868A
Printed in U.S.A. October, 1993






PCM58K Datasheet, Funktion
MSB ADJUSTMENT CIRCUITRY
With the optional bit adjustment circuitry shown in Figure
4, even greater performance can be realized by reducing the
first four major bit carry output errors to zero. The most
important adjustment for low level outputs would be the step
between BPZ (bipolar zero; MSB on, all other bits off) and
the code, which is one LSB less than BPZ (MSB off, all
other bits on), since every crossing of zero would go through
this bipolar major carry point. This MSB bit adjustment would
be made by outputing a very low level signal sine wave and
calibrating the 100kpotentiometer circuit connected to P28
and P27 while monitoring the THD+N of the PCM58P until
peak performance is observed.
Bits 2 through 4 can also be adjusted if desired to obtain
optimum full-scale output THD+N performance. An addi-
tional 100kpotentiometer adjustment circuit is required for
every additional bit to be adjusted. If bit adjustment is not
performed, the respective pins on the PCM58P should be
left open.
Once bit adjustment is performed, the reference voltage at
VPOT (P28) will track the internal reference, insuring that
the THD+N performance of the PCM58P will remain unaf-
fected by external temperature changes.
®
PCM58P
6

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