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

X  

AD7538 Fiches technique(PDF) 10 Page - Analog Devices

No de pièce AD7538
Description  LC2MOS Microprocessor-Compatible 14-Bit DAC
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7538 Fiches technique(HTML) 10 Page - Analog Devices

Back Button AD7538 Datasheet HTML 6Page - Analog Devices AD7538 Datasheet HTML 7Page - Analog Devices AD7538 Datasheet HTML 8Page - Analog Devices AD7538 Datasheet HTML 9Page - Analog Devices AD7538 Datasheet HTML 10Page - Analog Devices AD7538 Datasheet HTML 11Page - Analog Devices AD7538 Datasheet HTML 12Page - Analog Devices AD7538 Datasheet HTML 13Page - Analog Devices AD7538 Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 16 page
background image
AD7538
Rev. B | Page 10 of 16
CIRCUIT INFORMATION
EQUIVALENT CIRCUIT ANALYSIS
Figure 5 shows an equivalent circuit for the analog section
of the AD7538 DAC. The current source ILEAKAGE is composed
of surface and junction leakages. The RO resistor denotes the
equivalent output resistance of the DAC, which varies with
input code. COUT is the capacitance due to the current steering
switches and varies from about 90 pF to 180 pF (typical values)
depending upon the digital input. g(VREF, N) is the Thevenin
equivalent voltage generator due to the reference input voltage,
VREF, and the transfer function of the DAC ladder, N.
ILEAKAGE
COUT
IOUT
AGND
RFB
RO
R/4
g (VREF, N)
Figure 5. AD7538 Equivalent Analog Output Circuit
DIGITAL SECTION
The digital inputs are designed to be both TTL and 5 V CMOS
compatible. All logic inputs are static protected MOS gates with
typical input currents of less than 1 nA. To minimize power supply
currents, it is recommended that the digital input voltages be
driven as close as possible to 0 V and 5 V logic levels.
UNIPOLAR BINARY OPERATION (2-QUADRANT
MULTIPLICATION)
Figure 6 shows the circuit diagram for unipolar binary
operation. With an ac input, the circuit performs 2-quadrant
multiplication. The code table for Figure 6 is given in Table 6.
Capacitor C1 provides phase compensation and helps prevent
overshoot and ringing when high-speed op amps are used.
619
5
24
23
1
20
21
22
2
3
4
DB13 TO DB0 DGND
VDD
VREF
VIN
RFB
IOUT
VDD
VO
–15V
AGND
VSS
LDAC
CS
WR
LDAC
CS
WR
AD7538
A1
R3
1kΩ
R2
10Ω
R1
20Ω
R4
47kΩ
INPUT DATA
DIGITAL
GND
C2
4.7µF
C1
33pF
ANALOG
GND
AD711
+
Figure 6. Unipolar Binary Operation
Table 6. Unipolar Binary Code Table
Binary Number In
DAC Register
Analog Output, VOUT
MSB
LSB
11 1111 1111 1111
−VIN(16,383/16,384)
10 0000 0000 0000
−VIN(8192/16,384) = −½VIN
00 0000 0000 0001
−VIN(1/16,384)
00 0000 0000 0000
0 V
For zero offset adjustment, the DAC register is loaded with
all 0s and amplifier offset (VOS) adjusted so that VOUT is 0 V.
Adjusting VOUT to 0 V is not necessary in many applications,
but it is recommended that VOS be no greater than (25 × 10−6)
(VREF) to maintain specified DAC accuracy (see the Application
Hints section).
Full-scale trimming is accomplished by loading the DAC
register with all 1s and adjusting R1 so that VOUTA = −VIN
(16,383/16,384). For high temperature operation, resistors
and potentiometers should have a low temperature coefficient.
In many applications, because of the excellent gain TC and
gain error specifications of the AD7538, gain error trimming is
not necessary. In fixed reference applications, full scale can also
be adjusted by omitting R1 and R2 and trimming the reference
voltage magnitude.


Numéro de pièce similaire - AD7538

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
AD7538 AD-AD7538 Datasheet
148Kb / 8P
   LC2MOS uP-Compatible 14-Bit DAC
REV. A
AD7538 AD-AD7538 Datasheet
306Kb / 16P
   LC2MOS Microprocessor-Compatible 14-Bit DAC
REV. B
AD7538AQ AD-AD7538AQ Datasheet
148Kb / 8P
   LC2MOS uP-Compatible 14-Bit DAC
REV. A
AD7538AQ AD-AD7538AQ Datasheet
306Kb / 16P
   LC2MOS Microprocessor-Compatible 14-Bit DAC
REV. B
AD7538BQ AD-AD7538BQ Datasheet
148Kb / 8P
   LC2MOS uP-Compatible 14-Bit DAC
REV. A
More results

Description similaire - AD7538

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
AD7538JRZ AD-AD7538JRZ Datasheet
306Kb / 16P
   LC2MOS Microprocessor-Compatible 14-Bit DAC
REV. B
AD7535 AD-AD7535 Datasheet
496Kb / 12P
   LC2MOS uP-COMPATIBLE 14-BIT DAC
REV. A
AD7536 AD-AD7536 Datasheet
620Kb / 12P
   LC2MOS 14-BIT uP-COMPATIBLE DAC
AD7538 AD-AD7538 Datasheet
148Kb / 8P
   LC2MOS uP-Compatible 14-Bit DAC
REV. A
AD7538 AD-AD7538_15 Datasheet
306Kb / 16P
   Microprocessor-Compatible 14-Bit DAC
REV. B
AD7836 AD-AD7836 Datasheet
174Kb / 12P
   LC2MOS Quad 14-Bit DAC
REV. A
AD7840 AD-AD7840 Datasheet
338Kb / 16P
   LC2MOS Complete 14-Bit DAC
REV. B
AD7834 AD-AD7834 Datasheet
404Kb / 16P
   LC2MOS Quad 14-Bit DAC
REV. A
AD7836ASZ AD-AD7836ASZ Datasheet
176Kb / 12P
   LC2MOS Quad 14-Bit DAC
REV. A
AD7548 AD-AD7548 Datasheet
612Kb / 7P
   LC2MOS 8-BIT uP COMPATIBLE 12-BIT DAC
REV. A
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