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參數資料
| 型號： | LTC263ACSC6-LZ12#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 4.4 us SETTLING TIME, 12-BIT DAC, PDSO6 |
| 封裝： | LEAD FREE, PLASTIC, MO-203AB, SC-70, 6 PIN |
| 文件頁數： | 8/20頁 |
| 文件大小： | 341K |
| 代理商： | LTC263ACSC6-LZ12#TRPBF |
LTC2630
16
2630f
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C2
C1
C0
X
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
C3
X
CS/LD
SCK
SDI
COMMAND WORD
DATA WORD
8 DON’T-CARE BITS
4 DON’T-CARE BITS
2630 F03b
32-BIT INPUT WORD
OPERATION
Figure 3b. 32-Bit Load Sequence
LTC2630-12 SDI Data Word: 12-Bit Input Code + 4 Don’t-Care Bits (Shown);
LTC2630-10 SDI Data Word: 10-Bit Input Code + 6 Don’t-Care Bits;
LTC2630-8 SDI Data Word: 8-Bit Input Code + 8 Don’t-Care Bits
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C2
C1
C0
X
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
C3
CS/LD
SCK
SDI
COMMAND WORD
4 DON’T-CARE BITS
DATA WORD
24-BIT INPUT WORD
2630 F03a
Figure 3a. 24-Bit Load Sequence (Minimum Input Word)
LTC2630-12 SDI Data Word: 12-Bit Input Code + 4 Don’t-Care Bits (Shown);
LTC2630-10 SDI Data Word: 10-Bit Input Code + 6 Don’t-Care Bits;
LTC2630-8 SDI Data Word: 8-Bit Input Code + 8 Don’t-Care Bits
Optoisolated 4mA to 20mA Process Controller
Figure 5 shows how to use an LTC2630HZ to make an
optoisolated, digitally-controlled 4mA to 20mA transmit-
ter. The transmitter circuitry, including optoisolation, is
powered by the loop voltage which has a wide range of
5.4V to 80V. The 5V output of the LT
3010-5 is used to
set the 4mA offset current and VOUT is used to digitally
control the 0mA to 16mA signal current. The supply cur-
rent for the regulator, DAC, and op amp is well below
the 4mA budget at zero scale. RS senses the total loop
current, which includes the quiescent supply current and
additional current through Q1. Note that at the maximum
loop voltage of 80V, Q1 will dissipate 1.6W when IOUT =
20mA and must have an appropriate heat sink.
ROFFSET and RGAIN are the closest 0.1% values to ideal
for controlling a 4mA to 20mA output as the digital input
varies from zero scale to full scale. Alternatively, ROFFSET
can be a 365k, 1% resistor in series with a 20k trim pot
and RGAIN can be a 75.0k, 1% resistor in series with a 5k
trim pot. The optoisolators shown will limit the speed of
the serial bus; the 6N139 is an alternative that will allow
higher data rates.
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