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ADM1490EBRMZ 数据表(PDF) 4 Page - Analog Devices

部件名 ADM1490EBRMZ
功能描述  16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers
Download  16 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADM1490EBRMZ 数据表(HTML) 4 Page - Analog Devices

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ADM1490E/ADM1491E
Rev. B | Page 4 of 16
TIMING SPECIFICATIONS
TA = −40°C to +85°C.
Table 2.
Parameter
Symbol
Min
Typ
Max
Unit
Test Conditions
DRIVER
Maximum Data Rate
16
Mbps
Propagation Delay
tDPLH, tDPHL
11
17
ns
RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3
Driver Output Skew
tSKEW
0.5
2
ns
RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3,
tSKEW = |tDPLH − tDPHL|
Rise Time/Fall Time
tDR, tDF
8
15
ns
RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3
Enable Time
tZH, tZL
20
ns
RL = 110 Ω, CL = 50 pF, see Figure 24 and Figure 5
Disable Time
tHZ, tLZ
20
ns
RL = 110 Ω, CL = 50 pF, see Figure 24 and Figure 5
RECEIVER
Propagation Delay
tPLH, tPHL
12
20
ns
CL = 15 pF, see Figure 25 and Figure 4
Skew |tPLH − tPHL|
tSKEW
0.4
2
ns
CL = 15 pF, see Figure 25 and Figure 4
Enable Time
tZH, tZL
13
ns
RL = 1 kΩ, CL = 15 pF, see Figure 26 and Figure 6
Disable Time
tHZ, tLZ
13
ns
RL = 1 kΩ, CL = 15 pF, see Figure 26 and Figure 6
Timing Diagrams
Switching Characteristics
Z
Y
VCC/2
VCC/2
tDPLH
tDPHL
1/2VO
VO
90% POINT
10% POINT
10% POINT
90% POINT
VDIFF = V(Y) – V(Z)
tDR
tDF
–VO
VDIFF
+VO
0V
VCC
DE
Y, Z
Y, Z
VCC
0V
0V
VOL
VOH
0.5VCC
0.5VCC
tZL
tLZ
tZH
tHZ
VOL + 0.5V
VOH – 0.5V
2.3V
2.3V
Figure 5. Driver Enable/Disable Timing
Figure 3. Driver Propagation Delay Rise/Fall Timing
A – B
RO
0V
0V
1.5V
1.5V
VOH
VOL
tPLH
tPHL
tSKEW =|tPLH tPHL|
OUTPUT LOW
OUTPUT HIGH
1.5V
1.5V
RO
RO
RE
0V
0.7VCC
0.3VCC
VOL
VOH
0.5VCC
0.5VCC
tZL
tLZ
tZH
tHZ
VOL + 0.5V
VOH –0.5V
Figure 6. Receiver Enable/Disable Timing
Figure 4. Receiver Propagation Delay Timing


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