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DAC1220 Datenblatt(PDF) 9 Page - Texas Instruments

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Teilenummer DAC1220
Bauteilbeschribung  20-Bit, Low-Power Digital-to-Analog Converter
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DAC1220 Datenblatt(HTML) 9 Page - Texas Instruments

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background image
t
XIN
t
1
X
IN
t
2
t
3
t
4
t
5
t
7
t
6
t
8
SCLK
SDIO
DAC1220
www.ti.com...................................................................................................................................... SBAS082G – FEBRUARY 1998 – REVISED SEPTEMBER 2009
DIGITAL INTERFACE
Timing
The serial interface is synchronous and controlled by the SCLK input. The DAC1220 latches incoming bits on the
falling edge of SCLK, and shifts outgoing bits on the rising edge of SCLK. An external interface should shift
outgoing bits on the rising edge of SCLK, and latch incoming bits on the falling edge of SCLK. The relevant
waveforms are illustrated in the timing diagrams (see Figure 7 to Figure 11). Timing numbers are given in
Table 2 through Table 4.
Figure 7. XIN Clock Timing
Table 2. XIN Timing Characteristics
SYMBOL
DESCRIPTION
MIN
NOM
MAX
UNITS
fXIN
XIN clock frequency
1
2.5
MHz
tXIN
XIN clock period
400
1000
ns
t1
XIN clock high
0.4 × tXIN
ns
t2
XIN clock low
0.4 × tXIN
ns
Figure 8. Serial Input/Output Timing
Table 3. Serial I/O Timing Characteristics
SYMBOL
DESCRIPTION
MIN
NOM
MAX
UNITS
t3
SCLK high
5 × tXIN
ns
t4
SCLK low
5 × tXIN
ns
t5
Data in valid to SCLK falling edge (setup)
40
ns
t6
SCLK falling edge to data in not valid (hold)
20
ns
t7
Data out valid to rising edge of SCLK (hold)
0
ns
t8
SCLK rising edge to new data out valid (delay)
50
ns
Copyright © 1998–2009, Texas Instruments Incorporated
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