Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

DAC1221E Fiches technique(PDF) 6 Page - Texas Instruments

Click here to check the latest version.
No de pièce DAC1221E
Description  16-Bit Low Power DIGITAL-TO-ANALOG CONVERTER
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

DAC1221E Fiches technique(HTML) 6 Page - Texas Instruments

Back Button DAC1221E Datasheet HTML 2Page - Texas Instruments DAC1221E Datasheet HTML 3Page - Texas Instruments DAC1221E Datasheet HTML 4Page - Texas Instruments DAC1221E Datasheet HTML 5Page - Texas Instruments DAC1221E Datasheet HTML 6Page - Texas Instruments DAC1221E Datasheet HTML 7Page - Texas Instruments DAC1221E Datasheet HTML 8Page - Texas Instruments DAC1221E Datasheet HTML 9Page - Texas Instruments DAC1221E Datasheet HTML 10Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 16 page
background image
6
®
DAC1221
FIGURE 1. Capacitor Connections.
THEORY OF OPERATION
The DAC1221 is a precision, high dynamic range, self-
calibrating, 16-bit, delta-sigma digital-to-analog converter.
It contains a second-order delta-sigma modulator, a first-
order switched-capacitor filter, a second-order continuous-
time post filter, a microcontroller including the Instruction,
Command and Calibration registers, a serial interface, and a
clock generator circuit.
The design topology provides low system noise and good
power-supply rejection. The modulator frequency of the
delta-sigma D/A converter is controlled by the system clock.
The DAC1221 also includes complete onboard calibration
that can correct for internal offset and gain errors.
The calibration registers are fully readable and writable.
This feature allows for system calibration. The various
settings, modes, and registers of the DAC1221 are read or
written via a synchronous serial interface. This interface
operates as an externally clocked interface.
DEFINITION OF TERMS
Differential Nonlinearity Error—The differential
nonlinearity error is the difference between an actual step
width and the ideal value of 1 LSB. If the step width is
exactly 1 LSB, the differential nonlinearity error is zero.
A differential nonlinearity specification of less than 1 LSB
guarantees monotonicity.
Drift—The drift is the change in a parameter over tempera-
ture.
Full-Scale Range (FSR)—This is the magnitude of the
typical analog output voltage range which is 2 • VREF.
For example, when the converter is configured with a 1.25V
reference, the full-scale range is 2.5V.
Gain Error—This error represents the difference in the
slope between the actual and ideal transfer functions.
Linearity Error—The linearity error is the deviation of the
actual transfer function from an ideal straight line between
the data end points.
Least Significant Bit (LSB) Weight—This is the ideal
change in voltage that the analog output will change with a
change in the digital input code of 1 LSB.
Monotonicity—Monotonicity assures that the analog output
will increase or stay the same for increasing digital input
codes.
Offset Error—The offset error is the difference between the
expected and actual output, when the output is zero. The
value is calculated from measurements made when
VOUT = 20mV.
Settling Time—The settling time is the time it takes the
output to settle to its new value after the digital code has
been changed.
fXIN—The frequency of the crystal oscillator or CMOS-
compatible input signal at the XIN input of the DAC1221.
ANALOG OPERATION
The system clock is divided down to provide the sample
clock for the modulator. The sample clock is used by the
modulator to convert the multi-bit digital input into a 1-bit
digital output stream. The use of a 1-bit DAC provides
inherent linearity. The digital output stream is then con-
verted into an analog signal via the 1-bit DAC and then
filtered by the 1st-order switched-capacitor filter.
The output of the switched-capacitor filter feeds into the
continuous time filter. The continuous time filter uses exter-
nal capacitors, C1 and C2, to adjust the settling time. The
connections for capacitors are shown in Figure 1. C1 con-
nects to VREF. C2 connects between the C2 pins. C3 is
connected between C3 and VREF, and is used for calibration.
CALIBRATION
The DAC1221 offers a self-calibration mode which auto-
matically calibrates the output offset and gain. The calibra-
tion is performed once and then normal operation is re-
sumed. In general, calibration is recommended immediately
after power-on and whenever there is a “significant” change
in the operating environment. The amount of change which
should cause re-calibration is dependent on the application.
Where high accuracy is important, re-calibration should be
done on changes in temperature and power supply.
After a calibration has been accomplished, the Offset Cali-
bration Register (OCR) and the Full-Scale Calibration Reg-
ister (FCR) contain the results of the calibration.
Note that the values in the calibration registers will vary
from configuration to configuration and from part to part.
V
REF
C
2A
C
1
C
3
C
2B
12
11
10
9
7
8
DAC1221
C
3
6.8nF
C
1
2.2nF
C
2
150pF
NOTE: C
1 and C2 should be NPO type capacitors.


Numéro de pièce similaire - DAC1221E

FabricantNo de pièceFiches techniqueDescription
logo
Burr-Brown (TI)
DAC1221E BURR-BROWN-DAC1221E Datasheet
125Kb / 14P
   16-Bit Low Power DIGITAL-TO-ANALOG CONVERTER
More results

Description similaire - DAC1221E

FabricantNo de pièceFiches techniqueDescription
logo
Burr-Brown (TI)
DAC1221 BURR-BROWN-DAC1221 Datasheet
125Kb / 14P
   16-Bit Low Power DIGITAL-TO-ANALOG CONVERTER
logo
Micro Analog systems
MAS6501 MAS-MAS6501 Datasheet
205Kb / 16P
   16-Bit Analog-to-Digital Converter
logo
DATEL, Inc.
5962-8953101HXA DATEL-5962-8953101HXA Datasheet
149Kb / 1P
   16-Bit Digital To Analog Converter
5962-8953102HXC DATEL-5962-8953102HXC Datasheet
149Kb / 1P
   16-Bit Digital To Analog Converter
logo
SHENZHEN FUMAN ELECTRON...
SC8211 FUMAN-SC8211 Datasheet
592Kb / 9P
   16 Bit Digital to Analog Converter
logo
Burr-Brown (TI)
ADC76 BURR-BROWN-ADC76 Datasheet
113Kb / 8P
   16-Bit ANALOG-TO-DIGITAL CONVERTER
logo
DATEL, Inc.
5962-8953102HXA DATEL-5962-8953102HXA Datasheet
149Kb / 1P
   16-Bit Digital To Analog Converter
logo
Princeton Technology Co...
PT8211 PTC-PT8211_10 Datasheet
290Kb / 13P
   16 Bit Digital to Analog Converter
logo
DATEL, Inc.
5962-8953101HXC DATEL-5962-8953101HXC Datasheet
149Kb / 1P
   16-Bit Digital To Analog Converter
logo
Princeton Technology Co...
PT8211L PTC-PT8211L Datasheet
124Kb / 4P
   16 Bit Digital to Analog Converter
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com