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PDF PCM54HP Data sheet ( Hoja de datos )

Número de pieza PCM54HP
Descripción 16-Bit Monolithic DIGITAL-TO-ANALOG CONVERTERS
Fabricantes Burr-Brown Corporation 
Logotipo Burr-Brown Corporation Logotipo



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® PCM54
PCM55
DESIGNED FOR AUDIO
16-Bit Monolithic
DIGITAL-TO-ANALOG CONVERTERS
FEATURES
q PARALLEL INPUT FORMAT
q 16-BIT RESOLUTION
q 15-BIT MONOTONICITY (typ)
q –92dB TOTAL HARMONIC DISTORTION
(K Grade)
q 3µs SETTLING TIME (Voltage Out)
DESCRIPTION
The PCM54 and PCM55 family of converters are
parallel input, fully monotonic, 16-bit digital-to-ana-
log converters that are designed and specified for
digital audio applications. These devices employ ul-
tra-stable nichrome (NiCr) thin-film resistors to pro-
vide monotonicity, low distortion, and low differential
linearity error (especially around bipolar zero) over
long periods of time and over the full operating
temperature.
These converters are completely self-contained with a
stable, low noise, internal, zener voltage reference;
high speed current switches; a resistor ladder
network; and a fast settling, low noise output opera-
tional amplifier all on a single monolithic chip. The
converters are operated using two power supplies that
q 96dB DYNAMIC RANGE
q ±3V or ±1mA AUDIO OUTPUT
q OPERATES ON ±5V (PCM55) TO ±12V
(PCM54) SUPPLIES
q 28-PIN DIP (PCM54)
q 24-LEAD SOIC (PCM55)
can range from ±5V (PCM55) to ±12V (PCM54).
Power dissipation with ±5V supplies is typically less
than 200mW. Also included is a provision for exter-
nal adjustment of the MSB error (differential linearity
error at bipolar zero, PCM54 only) to further improve
Total Harmonic Distortion (THD) specifications if
desired.
A current output (IOUT) wiring option is provided. This
output typically settles to within ±0.006% of FSR
final value in 350ns (in response to a full-scale change
in the digital input code).
The PCM54 is packaged in 28-pin plastic DIP pack-
age. The PCM55 is available in a 24-lead plastic mini-
flatpak.
Reference
Voltage
RF
Parallel
Digital
Input
16-Bit Ladder
Resistor Network
and
Current Switches
Output
Operational
Amplifier
Audio Output
(Voltage)
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
©1985 Burr-Brown Corporation
PDS-619B
Printed in U.S.A. August, 1998

1 page




PCM54HP pdf
POWER SUPPLY SENSITIVITY
Changes in the DC power supplies will affect accuracy.
The PCM54 and PCM55 power supply sensitivity is shown
by Figure 2. Normally, regulated power supplies with 1% or
less ripple are recommended for use with the DAC. See also
Power Supply Connections paragraph in the Installation and
Operating Instructions section.
10.0
3.0
1.0
0.30
0.10
0.03
0.01
0.003
0.001
–60dB
–20dB
0dB
5 10 15
±VCC Supplies (V)
FIGURE 2. Effects of ±VCC on Total Harmonic Distortion
(PCM54JP; VCCs with approximately 2% ripple).
SETTLING TIME
Settling time is the total time (including slew time) required
for the output to settle within an error band around its final
value after a change in input (see Figure 3).
Settling times are specified to ±0.006% of FSR; one for a
large output voltage change of 3V and one for a 1LSB
change. The 1LSB change is measured at the major carry
(0111…11 to 10000.00), the point at which the worst-case
settling time occurs.
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
FIGURE 3. Full-Scale Range Settling Time vs Accuracy.
STABILITY WITH TIME AND TEMPERATURE
The parameters of a D/A converter designed for audio
applications should be stable over a relatively wide tempera-
ture range and over long periods of time to avoid undesirable
periodic readjustment. The most important parameters are
bipolar zero, 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 PCM54 and PCM55 are 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 match-
ing and tracking of resistor ratios and upon VBE and hFE of
the current-source transistors. The PCM54 and PCM55 were
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.
DYNAMIC RANGE
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 dy-
namic range of a converter is approximately 6 x n, or about
96dB for 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.
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.
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 PCM54/55 error referred to the
input can be shown to be:
(1)
ε rms =
1
n
n
Σ
[ΕL (i)
+
ΕQ
(i)]2
i =1
where n is the number of samples in one cycle of any given
sine wave, EL(i) is the linearity error of the PCM54 or
PCM55 at each sampling point, and EQ(i) is the quantization
®
5 PCM54/55

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