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PDF PCM56P Data sheet ( Hoja de datos )

Número de pieza PCM56P
Descripción Serial Input 16-Bit Monolithic DIGITAL-TO-ANALOG CONVERTER
Fabricantes Burr-Brown Corporation 
Logotipo Burr-Brown Corporation Logotipo



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No Preview Available ! PCM56P Hoja de datos, Descripción, Manual

® PCM56P
PCM56U
DESIGNED FOR AUDIO
Serial Input 16-Bit Monolithic
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q SERIAL INPUT
q –92dB MAX THD: FS Input, K Grade
q –74dB MAX THD: –20dB Input, K Grade
q 96dB DYNAMIC RANGE
q NO EXTERNAL COMPONENTS REQUIRED
q 16-BIT RESOLUTION
q 15-BIT MONOTONICITY, TYP
q 0.001% OF FSR TYP DIFFERENTIAL
LINEARITY ERROR
q 1.5µs SETTLING TIME, TYP: Voltage Out
q ±3V OR ±1mA AUDIO OUTPUT
q EIAJ STC-007-COMPATIBLE
q OPERATES ON ±5V TO ±12V SUPPLIES
q PINOUT ALLOWS IOUT OPTION
q PLASTIC DIP OR SOIC PACKAGE
DESCRIPTION
The PCM56 is a state-of-the-art, fully monotonic,
digital-to-analog converter that is designed and
specified for digital audio applications. This device
employs ultra-stable nichrome (NiCr) thin-film
resistors to provide monotonicity, low distortion, and
low differential linearity error (especially around
bipolar zero) over long periods of time and over the
full operating temperature.
This converter is completely self-contained with a
stable, low noise, internal zener voltage reference;
high speed current switches; a resistor ladder net-
work; and a fast settling, low noise output operational
amplifier all on a single monolithic chip. The
converters are operated using two power supplies that
can range from ±5V to ±12V. Power dissipation with
±5V supplies is typically less than 200mW. Also
included is a provision for external adjustment of the
MSB error (differential linearity error at bipolar zero)
to further improve total harmonic distortion (THD)
specifications if desired. Few external components
are necessary for operation, and all critical
specifications are 100% tested. This helps assure the
user of high system reliability and outstanding overall
system performance.
The PCM56 is packaged in a high-quality 16-pin
molded plastic DIP package or SOIC and has passed
operating life tests under simultaneous high-pressure,
high-temperature, and high-humidity conditions.
Reference
16-Bit
IOUT DAC
16-Bit Input Latch
RF
Audio
Output
16-Bit Serial-to-Parallel Conversion
Clock LE Data
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
©1987 Burr-Brown Corporation
PDS-700D
Printed in U.S.A. August, 1993

1 page




PCM56P pdf
1.0
0.3
0.1
0.03
Current
Output
Mode
Voltage
Output
Mode
0.01
0.003
RL = 200
0.001
0.01
0.1 1.0
Settling Time (µs)
10.0
The THD is defined as the ratio of the square root of the sum
of the squares of the values of the harmonics to the value of
the fundamental input frequency and is expressed in percent
or dB. The rms value of the PCM56 error referred to the
input can be shown to be:
rms =
n
2
1 /n
 EL
(i)
+
E
Q
(i)
i =1
(1)
where n is the number of samples in one cycle of any given
sine wave, EL(i) is the linearity error of the PCM56 at each
sampling point, and EQ(i) is the quantization error at each
sampling point. The THD can then be expressed as:
FIGURE 3. Full Scale Range Settling Time vs Accuracy.
THD = ∈ rms / E rms
STABILITY WITH TIME AND TEMPERATURE
The parameters of a D/A converter designed for audio
applications should be stable over a relatively wide
temperature range and over long periods of time to avoid
undesirable periodic readjustment. The most important
parameters are Bipolar Zero Error, Differential Linearity
Error, and Total Harmonic Distortion. Most of the Offset
and Gain drift with temperature or time is due to the drift of
the internal reference zener diode. The PCM56 is designed
so that these drifts are in opposite directions so that the
Bipolar Zero voltage is virtually unaffected by variations in
the reference voltage. Both DLE and THD are dependent
upon the matching and tracking of resistor ratios and upon
VBE and hFE of the current-source transistors. The PCM56
was designed so that any absolute shift in these components
has virtually no effect on DLE or THD. The resistors are
made of identical links of ultra-stable nichrome thin-film.
The current density in these resistors is very low to further
enhance their stability.
n
2
1 /n
 EL
(i)
+
E
Q
(i)
i =1
(2)
= X 100%
Erms
where Erms is the rms signal-voltage level.
This expression indicates that, in general, there is a correlation
between the THD and the square root of the sum of the
squares of the linearity errors at each digital word of interest.
However, this expression does not mean that the worst-case
linearity error of the D/A is directly correlated to the THD.
For the PCM56 the test period was chosen to be 22.7µs
(44.1kHz), which is compatible with the EIAJ STC-007
specification for PCM audio. The test frequency is 991Hz
and the amplitude of the input signal is 0dB, –20dB, and
–60dB down from full scale.
Figure 4 shows the typical THD as a function of output
voltage.
DYNAMIC RANGE
Figure 5 shows typical THD as a function of frequency.
The Dynamic Range is a measure of the ratio of the smallest
signals the converter can produce to the full-scale range and
is usually expressed in decibels (dB). The theoretical dynamic
range of a converter is approximately 6 x n, or about 96dB
of a 16-bit converter. The actual, or useful, dynamic range is
limited by noise and linearity errors and is therefore somewhat
less than the theoretical limit. However, this does point out
that a resolution of at least 16 bits is required to obtain a
90dB minimum dynamic range, regardless of the accuracy
of the converter. Another specification that is useful for
audio applications is Total Harmonic Distortion.
10.0
1.0
0.1
0.01
14 Bits
TOTAL HARMONIC DISTORTION
THD is useful in audio applications and is a measure of the
magnitude and distribution of the Linearity Error, Differential
Linearity Error, and Noise, as well as Quantization Error. To
be useful, THD should be specified for both high level and
low level input signals. This error is unadjustable and is the
most meaningful indicator of D/A converter accuracy for
audio applications.
0.001
–60
16 Bits
–50 –40 –30 –20 –10
VOUT (dB)
0dB = Full Scale Range (FSR)
0
FIGURE 4. Total Harmonic Distortion (THD) vs VOUT.
®
5 PCM56

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