参数资料
| 型号： | AD8177ABPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 27/40页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO CROSSPOINT SWIT 676BGA |
| 标准包装： | 1 |
| 功能： | 视频交叉点开关 |
| 电路： | 3 x 16:5 |
| 电压电源： | 单/双电源 |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V，±2.5V |
| 电流 - 电源： | 460mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 676-BGA |
| 供应商设备封装： | 676-BGA（27x27） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页当前第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
AD8177
Rev. 0 | Page 33 of 40
Power Dissipation
Calculation of Power Dissipation
06
60
5-
0
04
AMBIENT TEMPERATURE (°C)
MA
XI
M
U
M
P
O
W
E
R
(
W
)
3
4
5
6
7
8
9
10
15
25
35
45
55
65
75
85
TJ = 150°C
Figure 51. Maximum Die Power Dissipation vs. Ambient Temperature
The curve in Figure 51 was calculated from the following:
JA
AMBIENT
MAX
JUNCTION
MAX
D
T
P
θ
=
,
(1)
As an example, if the AD8177 is enclosed in an environment
at 45°C (TA), the total on-chip dissipation under all load and
supply conditions must not be allowed to exceed 7.0 W.
When calculating on-chip power dissipation, it is necessary to
include the power dissipated in the output devices due to
current flowing in the loads. For a sinusoidal output about
ground and symmetrical split supplies, the on-chip power
dissipation due to the load can be approximated by
PD,OUTPUT
= (VPOS VOUTPUT,RMS) × IOUTPUT,RMS
(2)
For nonsinusoidal output, the power dissipation should be
calculated by integrating the on-chip voltage drop across the
output devices multiplied by the load current over one period.
The user can subtract the quiescent current for the Class AB
output stage when calculating the loaded power dissipation.
For each output stage driving a load, subtract a quiescent power,
according to
PDQ, OUTPUT
= (VPOS VNEG) × IOUTPUT, QUIESCENT
(3)
where IOUTPUT, QUIESCENT = 1.65 mA for each single-ended output
pin of the AD8177.
For each disabled RGB output channel, the quiescent power supply
current in VPOS and VNEG drops by approximately 34 mA.
QNPN
QPNP
VNEG
VPOS
VOUTPUT
IOUTPUT
IO, QUIESCENT
06
60
5-
0
25
Figure 52. Simplified Output Stage
Example
With an ambient temperature of 85°C, all five RGB output channels
driving 1 Vrms into 100 Ω loads, and power supplies at ±2.5 V,
follow these steps:
1.
Calculate power dissipation using data sheet quiescent
currents. Neglect VDD current because it is insignificant.
PD,QUIESCENT
= (VPOS × IVPOS) + (VNEG × IVNEG)
(4)
PD,QUIESCENT
= (2.5 V × 460 mA) + (2.5 V × 460 mA) = 2.3 W
2.
Calculate power dissipation from loads. For a differential
output and ground-referenced load, the output power is
symmetrical in each output phase.
PD, OUTPUT
= (VPOS VOUTPUT, RMS) × IOUTPUT, RMS
(5)
PD, OUTPUT
= (2.5 V 1 V) × 1 V/100 Ω = 15 mW
There are 15 output pairs, or 30 output currents.
nPD, OUTPUT
= 30 × 15 mW = 0.45 W
3.
Subtract quiescent output stage current for the number
of loads (30 in this example). The output stage is either
standing or driving a load, but the current needs to be
counted only once (valid for output voltages > 0.5 V).
PDQ, OUTPUT
= (VPOS VNEG) × IOUTPUT, QUIESCENT
(6)
PDQ, OUTPUT
= (2.5 V (2.5 V)) × 1.65 mA = 8.25 mW
There are 15 output pairs, or 30 output currents.
nPDQ, OUTPUT
= 30 × 8.25 mW = 0.25 W
4.
Verify that power dissipation does not exceed the maximum
allowed value.
PD, ON-CHIP
= PD,QUIESCENT + nPD, OUTPUT nPDQ, OUTPUT
(7)
PD, ON-CHIP =
2.3 W + 0.45 W 0.25 W = 2.5 W
From Figure 51 or Equation 1, this power dissipation is below
the maximum allowed dissipation for all ambient temperatures
up to, and including, 85°C.
相关PDF资料 |
PDF描述 |
|---|---|
| AD8178ABPZ | IC VIDEO CROSSPOINT SWIT 676BGA |
| AD8182ANZ | IC MULTIPLEXER DUAL 2X1 14DIP |
| AD8184AR | IC VIDEO MULTIPLEXER 4X1 14SOIC |
| AD8185ARUZ | IC MULTIPLEXER TRPL 2X1 24TSSOP |
| AD8187ARUZ | IC MULTIPLEXER TRPL 2X1 24TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8177-EVALZ | 制造商:AD 制造商全称:Analog Devices 功能描述:500 MHz, Triple 16 】 5 Video Crosspoint Switch |
| AD8178 | 制造商:AD 制造商全称:Analog Devices 功能描述:450 MHz, Triple 16 】 5 Video Crosspoint Switch |
| AD8178ABPZ | 功能描述:IC VIDEO CROSSPOINT SWIT 676BGA RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 其它有关文件:STG4159 View All Specifications 标准包装:5,000 系列:- 功能:开关 电路:1 x SPDT 导通状态电阻:300 毫欧 电压电源:双电源 电压 - 电源，单路/双路(±):±1.65 V ~ 4.8 V 电流 - 电源:50nA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:7-WFBGA，FCBGA 供应商设备封装:7-覆晶 包装:带卷 (TR) |
| AD8178ABPZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:450 MHz, Triple 16 】 5 Video Crosspoint Switch |
| AD8178-EVALZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:450 MHz, Triple 16 】 5 Video Crosspoint Switch |
发布紧急采购，3分钟左右您将得到回复。