IC 20-BIT MONOLITHIC D/A 16-QSOP

DAC1220E

Manufacturer Part NumberDAC1220E
DescriptionIC 20-BIT MONOLITHIC D/A 16-QSOP
ManufacturerTexas Instruments
DAC1220E datasheet
 


Specifications of DAC1220E

Settling Time1.8msNumber Of Bits20
Data InterfaceSerialNumber Of Converters1
Voltage Supply SourceAnalog and DigitalPower Dissipation (max)3.5mW
Operating Temperature-40°C ~ 85°CMounting TypeSurface Mount
Package / Case16-QSOPResolution20 bit
Interface TypeSerial (2-Wire, 3-Wire, SPI)Supply Voltage (max)5.25 V
Supply Voltage (min)4.75 VMaximum Operating Temperature+ 85 C
Mounting StyleSMD/SMTMinimum Operating Temperature- 40 C
For Use With296-17265 - MODULE EVALUATION FOR DAC1220Lead Free Status / RoHS StatusLead free / RoHS Compliant
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DAC1220
SBAS082G – FEBRUARY 1998 – REVISED SEPTEMBER
Setting the Output Voltage
To set the DAC1220 output voltage, write a code to
the Data Input Register (DIR). A write to any of the
bytes in the DIR causes the voltage to change at the
completion of the write command.
The DAC1220 operates in either 16- or 20-bit mode.
The DIR is 24 bits wide, and the code stored in it is
left justified, with the least significant bits ignored.
Therefore, in 16-bit mode, only the upper 16 bits of
the DIR are significant, and in 20-bit mode, only the
upper 20 bits of the DIR are significant.
In 20-bit mode, all three bytes of the DIR must be
written to in order to completely update the code. In
16-bit mode, it is only necessary to write to the two
upper bytes; a write to the lower byte has no effect on
the output.
DATA FORMAT
Offset two's complement
Straight binary
APPROXIMATE
OUTPUT
VOLTAGE
RESOLUTION
16-bit
0V
20-bit
16-bit
2.5V
20-bit
16-bit
5V
20-bit
(1) x = Do not care
14
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The code may be given in either straight binary or
offset two's complement format. This is controlled by
the DF bit in the Command Register (see the register
description in
format options and the 16- or 20-bit option give rise to
four transfer functions, which are shown in
For reference, several ideal output voltages for given
input codes are shown in
Note that the DIR code can also be considered a
24-bit number. This may be convenient in software. In
this case the transfer functions for 16- and 20-bit
modes are the same, except that in 16-bit mode the
code is truncated by eight bits, and in 20-bit mode the
code is truncated by four bits.
Table 8. Transfer Functions
20-BIT MODE
code)2
19
V
+ 2V
OUT
REF
2
20
code
V
+ 2V
OUT
REF
2
20
Table 9. Example Output Voltages
DATA FORMAT
CODE
Two's complement
8000h
Straight binary
0000h
Two's complement
8000h
Straight binary
0000h
Two's complement
0000h
Straight binary
8000h
Two's complement
0000h
Straight binary
8000h
Two's complement
7FFFh
Straight binary
FFFFh
Two's complement
7FFFFh
Straight binary
FFFFFh
Product Folder Link(s):
DAC1220
www.ti.com
Table 13
for details). The two data
Table
Table
9.
16-BIT MODE
code)2
15
V
+ 2V
OUT
REF
2
16
code
V
+ 2V
OUT
REF
2
16
(1)
DIR CONTENT
8000xxh
0000xxh
80000xh
00000xh
0000xxh
8000xxh
00000xh
80000xh
7FFFxxh
FFFFxxh
7FFFFxh
FFFFFxh
Copyright © 1998–2009, Texas Instruments Incorporated
8.