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PDF AD7391 Data sheet ( Hoja de datos )
| Número de pieza | AD7391 | |
| Descripción | +3 Volt Serial-Input Micropower 10-Bit & 12-Bit DACs | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD7391 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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a
+3 Volt Serial-Input
Micropower 10-Bit & 12-Bit DACs
AD7390/AD7391
FEATURES
Micropower—100 A
Single-Supply—؉2.7 to ؉5.5 V Operation
Compact 1.75 mm Height SO-8 Package
& 1.1 mm Height TSSOP-8
AD7390—12-Bit Resolution
AD7391—10-Bit Resolution
SPI & QSPI Serial Interface Compatible with Schmitt
Trigger Inputs
APPLICATIONS
Automotive 0.5 V to 4.5 V Output Span Voltage
Portable Communications
Digitally Controlled Calibration
GENERAL DESCRIPTION
The AD7390/AD7391 family of 10-bit & 12-bit voltage-output
digital-to-analog converters is designed to operate from a single
ϩ3 V supply. Built using a CBCMOS process, these monolithic
DACs offer the user low cost, and ease-of-use in single-supply
ϩ3 V systems. Operation is guaranteed over the supply voltage
range of ϩ2.7 V to ϩ5.5 V consuming less than 100 µA making
this device ideal for battery operated applications.
The full-scale voltage output is determined by the external ref-
erence input voltage applied. The rail-to-rail REFIN to DACOUT
allows for a full-scale voltage set equal to the positive supply
VDD or any value in between.
FUNCTIONAL DIAGRAM
REF
CLR
LD
CLK
SDI
AD7390
12-BIT DAC
12
DAC REGISTER
EN 12
SERIAL REGISTER
VDD
VOUT
GND
A doubled-buffered serial-data interface offers high speed,
three-wire, SPI and microcontroller compatible inputs using
data in (SDI), clock (CLK) and load strobe (LD) pins. Addi-
tionally, a CLR input sets the output to zero scale at power on
or upon user demand.
Both parts are offered in the same pinout to allow users to select
the amount of resolution appropriate for their application with-
out circuit card redesign.
The AD7390/AD7391 are specified over the extended industrial
(Ϫ40°C to ϩ85°C) temperature range. The AD7391AR is
specified for the Ϫ40°C to ϩ125°C automotive temperature
range. The AD7390/AD7391s are available in plastic DIP, and
low profile 1.75 mm height SO-8 surface mount packages. The
AD7391ARU is available for ultracompact applications in a thin
1.1 mm TSSOP-8 package.
1.00
AD7390
0.75
VDD = +3.0V
0.50
0.25
0.00
0.25
0.50
0.75
TA = 55 C, 25 C, 85 C
SUPERIMPOSED
1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE – Decimal
2.0
AD7390
1.5
1.0
25؇, 85؇C
VDD = +3.0V
VREF = +2.5V
0.5
0.0
؊0.5
؊1.0
؊55؇
؊1.5
؊2.0
0
512 1024 1536 2048 2560 3072 2584 4096
CODE – Decimal
Figure 1. Differential Nonlinearity Error vs. Code
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
Figure 2. INL Error vs. Code & Temperature
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
AD7390/AD7391
SDI
D11 D10
D9
D8 D7 D6
D5 D4 D3 D2 D1 D0
CLK
tLD1
LD
AD7390 AD7391
tLD1
tLD2
DAC REGISTER LOAD
SDI
CLK
LD
CLR
FS
VOUT
ZS
tDS
tCL
tDH
tCH
tLDW
tS
tCLRW
0.1% FS
ERROR BAND
tS
Figure 4. Timing Diagram
CLK
↑
X
X
X
X
CLR
H
H
L
↑
↑
LD
H
L
X
H
L
NOTES
1↑ = Positive logic transition.
2X = Don’t care.
Table I. Control-Logic Truth Table
Serial Shift Register Function
DAC Register Function
Shift-Register-Data Advanced One-Bit
Disables
No Effect
No Effect
Disabled
Latched
Updated with Current Shift Register Contents
Loaded with all Zeros
Latched with all Zeros
Previous SR Contents Loaded (Avoid usage of CLR
when LD is logic low, since SR data could be corrupted
if a clock edge takes place, while CLR returns high.)
Table II. AD7390 Serial Input Register Data Format, Data is Loaded in the MSB-First Format
MSB
B11 B10
B9
B8 B7 B6 B5 B4 B3 B2 B1
AD7390 D11 D10 D9
D8 D7 D6 D5 D4 D3 D2 D1
LSB
B0
D0
Table III. AD7391 Serial Input Register Data Format, Data is Loaded in the MSB-First Format
MSB
B9 B8 B7 B6 B5 B4 B3 B2 B1
AD7391 D9 D8 D7 D6 D5 D4 D3 D2 D1
LSB
B0
D0
REV. 0
–5–
5 Page 
MICROCOMPUTER INTERFACES
The AD7390 serial data input provides an easy interface to a va-
riety of single-chip microcomputers (µCs). Many µCs have a
built-in serial data capability which can be used for communi-
cating with the DAC. In cases where no serial port is provided,
or it is being used for some other purpose (such as an RS-232
communications interface), the AD7390/AD7391 can easily be
addressed in software.
Twelve data bits are required to load a value into the AD7390.
If more than 12 bits are transmitted before the load LD input
goes high, the extra (i.e., the most-significant) bits are ignored.
This feature is valuable because most µCs only transmit data in
8-bit increments. Thus, the µC sends 16 bits to the DAC in-
stead of 12 bits. The AD7390 will only respond to the last
12 bits clocked into the SDI input, however, so the serial-data
interface is not affected.
Ten data bits are required to load a value into the AD7391. If
more than 10 bits are transmitted before load LD returns high,
the extra bits are ignored.
AD7390/AD7391
REV. 0
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD7391.PDF ] | |
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