DAC7552 Datasheet, PDF (14/22 Pages) Texas Instruments – 12-BIT, DUAL, ULTRALOW GLITCH, VOLTAGE OUTPUT DIGITAL-TO-ANALOG CONVERTER

DAC7552
SLAS442B – JANUARY 2005 – REVISED JUNE 2005
TYPICAL CHARACTERISTICS (continued)
3-Wire Serial Interface
The DAC7552 digital interface is a standard 3-wire SPI/QSPI/Microwire/DSP-compatible interface.
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DB15
0
0
0
0
1
1
1
1
CONTROL
DB14 DB13
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
DB12
0
0
0
0
0
0
0
0
Table 1. Serial Interface Programming
DATA BITS DAC(s)
FUNCTION
DB11-DB10
data
A Single Channel Store. The input register of channel A is updated.
data
B Single Channel Store. The input register of channel B is updated.
data
A Single Channel Update. The input and DAC registers of channel A are
updated.
data
B Single Channel Update. The input and DAC registers of channel A are
updated and the DAC register of channel B is updated with input register data.
data
A Single Channel Update. The input and DAC registers of channel B are
updated.
data
B Single Channel Update. The input and DAC registers of channel B are
updated and the DAC register of channel A is updated with input register data.
data
A–B All Channel Update. The input and DAC registers of channels A and B are
updated.
data
A–B All Channel DAC Update. The DAC register of channels A and B are updated
with input register data.
POWER-DOWN MODE
In power-down mode, the DAC outputs are programmed to one of three output impedances, 1 kΩ, 100 kΩ, or
floating.
DB15
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
EXTENDED CONTROL
DB14
DB13
0
X
0
X
0
X
0
X
1
X
1
X
1
X
1
X
0
X
0
X
0
X
0
X
1
X
1
X
1
X
1
X
DB12
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Table 2. Power-Down Mode Control
DB11
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
DATA BITS
DB10
DB9-DB0
0
X
1
X
0
X
1
X
0
X
1
X
0
X
1
X
0
X
1
X
0
X
1
X
0
X
1
X
0
X
1
X
FUNCTION
PWD Hi-Z (all channels)
PWD 1 kΩ (all channels)
PWD 100 kΩ (all channels)
PWD Hi-Z (all channels)
PWD Hi-Z (selected channel = A)
PWD 1 kΩ (selected channel = A)
PWD 100 kΩ (selected channel = A)
PWD Hi-Z (selected channel = A)
PWD Hi-Z (selected channel = B)
PWD 1 kΩ (selected channel = B)
PWD 100 kΩ (selected channel = B)
PWD Hi-Z (selected channel = B)
PWD Hi-Z (all channels)
PWD 1 kΩ (all channels)
PWD 100 kΩ (all channels)
PWD Hi-Z (all channels)
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