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
Commands
Communication with the DAC1220 consists entirely of
commands, which access the DAC1220 registers.
Commands consist of a command byte followed by
one, two or three data bytes. The data bytes can be
sent to the DAC1220 or read from the DAC1220,
depending on whether the command is a read
command or a write command.
The format of the command byte is shown in
and the bits are described in
Table
commands access the register map, which is shown
in
Table
11. A DAC1220 command can read or write
one byte, or two or three adjacent bytes, in the
register map.
Bit and Byte Order
The order of the bits of data bytes in a command is
configurable. The DAC1220 can be programmed to
output data bytes MSB first or LSB first. The
command byte is always transmitted MSB first. See
the description of the MSB bit in
Table 6
details. The order of the data bytes themselves is
also configurable. See the description of the BD bit in
Table 13
for details. Note that the BD bit does not
affect the command byte; this always comes first.
7
6
5
R/W
MB
BIT(S)
NAME
VALUE
7
R/W
6–5
MB
3–0
ADR
12
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2009......................................................................................................................................
PROGRAMMING
Registers
There are four registers in the DAC1220, as shown in
the register map in
(DIR) and the two calibration registers are 24 bits in
length, and the Command Register (CMR), which
contains configuration bits, is 16 bits in length.
Table
6,
Modes
7. DAC1220
The DAC1220 has three operating modes: Sleep,
Normal, and Self Calibration.
In Sleep mode, the DAC1220 output is off (high
impedance), and much of the internal circuitry is
switched off. In this mode the DAC1220 draws little
power. The oscillator continues to run, however.
Sleep is the mode entered after reset.
In Normal mode, the DAC1220 is fully active, and the
output is on.
In Self Calibration mode, the DAC1220 runs its
for further
self-calibration sequence. After the sequence is
complete, the DAC1220 switches to Normal mode.
See the
Calibration
Table 6. Command Byte Format
4
3
0
Table 7. Command Byte Bits
0
Write to register map
1
Read from register map
Number of bytes to read or write
00b
1 byte
01b
2 bytes
10b
3 bytes
11b
Reserved; do not use
0–15
Start address in register map
Product Folder Link(s):
DAC1220
www.ti.com
Table
11. The Data Input Register
section for more information.
2
1
0
ADR
DESCRIPTION
Copyright © 1998–2009, Texas Instruments Incorporated