參數(shù)資料
型號(hào): DD-03232F0-101
英文描述: Other/Special/Miscellaneous Converter
中文描述: 其他/特別/雜項(xiàng)轉(zhuǎn)換器
文件頁(yè)數(shù): 4/12頁(yè)
文件大?。?/td> 221K
代理商: DD-03232F0-101
4
0V
0V
+V
A
-V
-V
+V
B
IN
IN
REF
OUT
REF
REF
OUT
REF
FIGURE 3. ARINC 429 WAVEFORM
Notes:
1. X = Don’t care.
2.The A
OUT
/B
OUT
notation is as follows:
+1 = V
REF
volts
0 = 0
TABLE 4. DD-03182 TRUTH TABLE
SYNC
(Note 1)
CLOCK
(Note 1)
DATA (A)
(Note 1)
DATA (B)
(Note 1)
A
OUT
(Note 2)
B
OUT
(Note 2)
COMMENTS
L
X
X
X
0
0
Null
X
L
X
X
0
0
Null
H
H
L
L
0
0
Null
H
H
H
H
0
0
Null
H
H
H
L
+1
-1
Logic 1
H
H
L
H
-1
+1
Logic 0
DATA (A)
DATA (B)
The DD-03182 line driver is designed to take data from a box and
place it on the data bus.The serial data is presented on DATA(A)
and DATA(B) inputs in a dual rail format. The driver is enabled by
the SYNC and CLOCK inputs. The output voltage level is pro-
grammed by the V
REF
input and is normally tied to +5 VDC along
with V
1
to produce output levels of +5V, 0V, and
-5 V on each output for 10 V differential outputs (see FIGURE 3).
The outputs are fused for fail-safe protection against shorts to
aircraft power. The output slew rate is controlled by external tim-
ing capacitors on C
A
and C
B
.
100 kHz data and 500 pF for 12.5 kHz data.
Typical Values are 75 pF for
The cable used in 429 buses is a twisted, shielded pair of 20- to
26-gauge conductors. The shield is grounded at both ends of the
cable run and at all production breaks. Although there is no
specification placed on the cable impedance, it generally falls in
the range of 60 to 80
.
Note: The output slew rates are controlled by timing capacitors C
A
and C
B
.They are charged to ±200μA (nominal).
Slew rate (SR) is calculated by SR = 200/C (V/μs), where C is in pF.
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