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DAC7621 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 DAC7621
부품 상세설명  12-Bit, Parallel Input DIGITAL-TO-ANALOG CONVERTER
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI1 - Texas Instruments

DAC7621 데이터시트(HTML) 9 Page - Texas Instruments

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9
DAC7621
The digital data into the DAC7621 is double-buffered. This
means that new data can be entered into the DAC without
disturbing the old data and the analog output of the con-
verter. At some point after the data has been entered into the
serial shift register, this data can be transferred into the DAC
register. This transfer is accomplished with a HIGH to LOW
transition of the LOADDAC pin. However, the LOADDAC
pin makes the DAC register transparent. If new data be-
comes available on the bus register while LOADDAC is
LOW, the DAC output voltage will change as the data
changes. To prevent this, CS must be returned HIGH prior
to changing data on the bus.
At any time, the contents of the DAC register can be set to
000H (analog output equals 0V) by taking the CLR input
LOW. The DAC register will remain at this value until CLR
is returned HIGH and LOADDAC is taken LOW to allow
the contents of the input register to be transferred to the
DAC register. If LOADDAC is LOW when CLR is taken
LOW, the DAC register will be set to 000H and the analog
output driven to 0V. When CLR is returned HIGH, the DAC
register and the analog output will respond accordingly.
DIGITAL-TO-ANALOG CONVERTER
The internal DAC section is a 12-bit voltage output
device that swings between ground and the internal ref-
erence voltage. The DAC is realized by a laser-trimmed
R-2R ladder network which is switched by N-channel
MOSFETs. The DAC output is internally connected to
the rail-to-rail output operational amplifier.
OPERATION
The DAC7621 is a 12-bit digital-to-analog converter (DAC)
complete with an input shift register, DAC register, laser-
trimmed 12-bit DAC, on-board reference, and a rail-to-rail
output amplifier. Figure 1 shows the basic operation of the
DAC7621.
INTERFACE
Figure 1 shows the basic connection between a
microcontroller and the DAC7621. The interface consists of
a Read/Write (R/W), data, and a load DAC signal
(LOADDAC). In addition, a chip select (CS) input is avail-
able to enable the DAC7621 when there are multiple de-
vices. The data format is Straight Binary. An asynchronous
clear input (CLR) is provided to simplify start-up or periodic
resets. Table I shows the relationship between input code
and output voltage.
DAC7621 Full-Scale Range = 4.095V
Least Significant Bit = 1mV
DIGITAL INPUT CODE
ANALOG OUTPUT
STRAIGHT OFFSET BINARY
(V)
DESCRIPTION
FFFH
+4.095
Full Scale
801H
+2.049
Midscale + 1 LSB
800H
+2.048
Midscale
7FFH
+2.047
Midscale – 1 LSB
000H
0
Zero Scale
TABLE I. Digital Input Code and Corresponding Ideal
Analog Output.
FIGURE 1. Basic Operation of the DAC7621.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CLR
V
DD
V
OUT
AGND
DGND
DB11
DB10
DB9
DB8
DB7
LOADDAC
CS
R/W
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DAC7621E
Load DAC
Chip Select
Read/Write
10
µF
+5V
Clear
Data Bus
Data Bus
0V to
+4.095V
0.1
µF
+


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