+ (VEE IEE) – N" />
參數(shù)資料
型號(hào)： LTC2846CG#TR
廠商： Linear Technology
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 0K
描述： IC TXRX 3.3V MULTIPROTCOL 36SSOP
標(biāo)準(zhǔn)包裝： 2,000
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 3/3
規(guī)程： 多協(xié)議
電源電壓： 3.3V
安裝類型： 表面貼裝
封裝/外殼： 36-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 36-SSOP
包裝： 帶卷 (TR)
其它名稱： LTC2846CGTR
18
LTC2846
sn2846 2846fs
+ (VEE IEE) – ND PRT
(3)
Since power is drawn from the supplies of the LTC2846
(VCC, VDD and VEE) at less than 100% efficiency, the
LTC2846 dissipates extra power to source PDISS(2845) and
PRT :
PDISS1(2846) = 125% (VCC ICC) + 125% 125%
(VDD IDD) + 125% 143% (VEE IEE)
– PDISS(2845) – ND PRT
= 25% (VCC ICC) + 56% (VDD IDD)
+ 79% (VEE IEE)
(4)
From the LTC2845 Electrical Characteristics Table, for
VCC = 5V, VDD = 8V and VEE = – 5.5V:
ICC at no load
2.7mA
ICC at full load with all drivers high
110mA
IEE at no load
2mA
IEE at full load with both V.10 drivers low
23mA
IDD at no load
0.3mA
IDD at full load
0.3mA
The V.11 drivers are driven between VCC and GND while
the V.10 drivers are driven between VCC and VEE. Assume
that the V.11 driver outputs are high and V.10 driver
outputs low. Current going into each 100
V.11 receiver
termination = (110mA – 2.7mA) – 23mA/3 = 28.1mA.
Current going into each 450
V.10 receiver termination =
23mA – 2mA/2 = 10.5mA. From Equation (2), V.11 PRT =
79mW and V.10 PRT = 49.6mW.
From Equation (3), PDISS(2845) = 5V (110mA – 23mA) +
(8V 0.3mA) + 5.5V 23mA – 3 79mW – 2 49.6mW =
228mW. Since the LTC2845 runs slow control signals, the
AC power dissipation can be assumed to be equal to the DC
power dissipation.
The extra power dissipated in the LTC2846 due to LTC2845
is given by Equation(4), PDISS1(2846) = 25% (5V 87mA)
+ 56% (8V 0.3mA) + 79% (5.5V 23mA) = 210mW.
So for an X.21 DCE port running at 10MBd, the LTC2846
dissipates approximately 918mW + 210mW = 1128mW
while the LTC2845 dissipates 228mW.
Compliance Testing
The LTC2846/LTC2844 and LTC2846/LTC2845 chipsets
have been tested by TUV Rheinland of North America Inc.
and passed the NET1, NET2 and TBR2 requirements.
Copies of the test reports are available from LTC or TUV
Rheinland of North America Inc.
The title of the reports are Test Report No.:
TBR2/051501/02 and TBR2/050101/02
The address of TUV Rheinland of North America Inc. is:
TUV Rheinland of North America Inc.
1775, Old Highway 8 NW, Suite 107
St. Paul, MN 55112
Tel. (651) 639-0775
Fax (651) 639-0873
TYPICAL APPLICATIO S
U
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