參數(shù)資料
型號: LTC1344AI
廠商: Linear Technology Corporation
英文描述: Software-Selectable Cable Terminator
中文描述: 軟件選擇電纜終結者
文件頁數(shù): 4/12頁
文件大小: 202K
代理商: LTC1344AI
4
LTC 1344A
PI
FU
CTIO
N
S
U
U
M0 (Pin 1):
TTL Level Mode Select Input. The data on M0
is latched when LATCH is high.
V
EE
(Pin 2):
Negative Supply Voltage Input. Can connect
directly to the LTC1543 V
EE
pin. Connect a 1
μ
F capacitor
to ground.
R1C (Pin 3):
Load 1 Center Tap.
R1B (Pin 4):
Load 1 Node B.
R1A (Pin 5):
Load 1 Node A.
R2A (Pin 6):
Load 2 Node A.
R2B (Pin 7):
Load 2 Node B.
R2C (Pin 8):
Load 2 Center Tap.
R3A (Pin 9):
Load 3 Node A.
R2B (Pin 10):
Load 2 Node B.
R3C (Pin 11):
Load 3 Center Tap.
GND (Pin 12):
Ground Connection for Load 1 to Load 3.
GND (Pin 13):
Ground Connection for Load 4 to Load 6.
V
CC
(Pin 14):
Positive Supply Input. 4.75V
V
CC
5.25V.
R4B (Pin 15):
Load 4 Node B.
R4A (Pin 16):
Load 4 Node A.
R5B (Pin 17):
Load 5 Node B.
R5A (Pin 18):
Load 5 Node A.
R6A (Pin 19):
Load 6 Node A.
R6B (Pin 20):
Load 6 Node B.
LATCH (Pin 21):
TTL Level Logic Signal Latch Input. When
LATCH is low the input buffers on M0, M1, M2 and DCE/
DTE are transparent. When LATCH is high the logic pins
are latched into their respective input buffers. The data
latch allows the select lines to be shared between multiple
I/O ports.
DCE/DTE (Pin 22):
TTL Level Mode Select Input. DCE
mode is selected when high and DTE mode when low. The
data on DCE/DTE is latched when LATCH is high.
M2 (Pin 23):
TTL Level Mode Select Input 1. The data on
M2 is latched when LATCH is high.
M1 (Pin 24):
TTL Level Mode Select Input 2. The data on
M1 is latched when LATCH is high.
TEST CIRCUITS
R1
51.5
R2
51.5
±
2V
1344 F02
R3
124
S2
ON
S1
ON
C
V
A, B
LTC1344A
R1
51.5
R2
51.5
±
7V OR
±
2V
1344 F01
R3
124
S2
OFF
S1
ON
C
V
A
B
LTC1344A
Figure 2. V.35 Common Mode Impedance Measurement
Figure 1. Differential V.11 or V.35 Impedance Measurement
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