Datenblatt-pdf.com


PCM55 Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer PCM55
Beschreibung 16-Bit Monolithic DIGITAL-TO-ANALOG CONVERTERS
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 7 Seiten
PCM55 Datasheet, Funktion
® 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






PCM55 Datasheet, Funktion
error at each sampling point. The THD can then be ex-
pressed as:
(2)
THD = εrms =
Ε rms
1
n
n
Σ
[Ε L (i) + ΕQ (i)]2
i =1
Ε rms
• 100%
where Erms is the rms signal voltage level.
This expression indicates that, in general, there is a correla-
tion 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 PCM54/55 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 420Hz
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.
Figure 5 shows typical THD as a function of frequency.
10.0
4.0
2.0
1.0
0.4
0.2 14 Bits
0.1
0.04
0.02
0.01
0.004
0.002
0.001
–60 –50 –40
0dB = Full-Scale Range (FSR)
–30
VOUT (dB)
16 Bits
–20
–10
0
FIGURE 4. Total Harmonic Distortion (THD) vs VOUT.
0.1
0.05
INSTALLATION AND OPERATING
INSTRUCTIONS
POWER SUPPLY CONNECTIONS
For optimum performance and noise rejection, power supply
decoupling capacitors should be added as shown in the
connections diagram. These capacitors (1µF tantalum or
electrolytic recommended) should be located close to the
converter.
MSB ERROR ADJUSTMENT PROCEDURE
(OPTIONAL)
The MSB error of the PCM54 and PCM55 can be adjusted
to make the differential linearity error (DLE) at BPZ essen-
tially zero. This is important when the signal output levels
are very low because zero crossing noise (DLE at BPZ)
becomes very significant when compared to the small code
changes occurring in the LSB portion of the converter.
Differential linearity error at bipolar zero is guaranteed to
meet data sheet specifications without any external adjust-
ment. However, a provision has been made for an optional
adjustment of the MSB linearity point which makes it
possible to eliminate DLE error at BPZ (PCM54 only). Two
procedures are given to allow either static or dynamic
adjustment. The dynamic procedure is preferred because of
the difficulty associated with the static method (accurately
measuring 16-bit LSB steps).
To statically adjust DLE at BPZ, refer to the circuit shown
in Figure 6 or the PCM54 connection diagram. After allow-
ing ample warm-up time (20-30 minutes) to assure stable
operation of the PCM54, select input code 8000 hexadeci-
mal (all bits off except the MSB). Measure and record it.
Change the digital input code to 7FFF hexadecimal (all bits
off except the MSB). Adjust the 100kpotentiometer to
make the audio output read 92µV more than the voltage
reading of the previous code (a ILSB step = 92µV).
A much simpler method is to dynamically adjust the DLE at
BPZ. Again, refer to Figure 6 or the PCM54 connection
diagram for circuitry and component values. Assuming the
device has been installed in a digital audio application
circuit, send the appropriate digital input to produce a –60dB
level sinusoidal output. While measuring the THD of the
audio circuit output, adjust the 100kpotentiometer until a
minimum level of distortion is observed.
0.02
0.01
0.005
–20dB
1 560k100k330k
27 1M
–VCC
0.002
0.001
100 1k
Frequency (Hz)
Full Scale
10k 20k
FIGURE 6. MSB Differential Linearity at Bipolar Zero Ad-
justment Circuit (optional).
FIGURE 5. Total Harmonic Distortion (THD) vs
Frequency.
®
PCM54/55
6

6 Page







SeitenGesamt 7 Seiten
PDF Download[ PCM55 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
PCM5100PCM510012 Audio Stereo DAC. (Rev. B)Texas Instruments
Texas Instruments
PCM5100APCM510xA 2.1 VRMS 112/106/100 dB Audio Stereo DAC with PLL and 32-bit 384 kHz PCM Interface (Rev. C)Texas Instruments
Texas Instruments
PCM5100A-Q1PCM510xA 2.1 VRMS 112/106/100 dB Audio Stereo DAC with PLL and 32-bit 384 kHz PCM Interface (Rev. C)Texas Instruments
Texas Instruments
PCM5101PCM510012 Audio Stereo DAC. (Rev. B)Texas Instruments
Texas Instruments
PCM5101APCM510xA 2.1 VRMS 112/106/100 dB Audio Stereo DAC with PLL and 32-bit 384 kHz PCM Interface (Rev. C)Texas Instruments
Texas Instruments

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche