參數(shù)資料
型號(hào)： AD8176ABPZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 27/40頁(yè)
文件大?。?/td> 0K
描述： IC VIDEO CROSSPOINT SWIT 676BGA
標(biāo)準(zhǔn)包裝： 1
功能： 視頻交叉點(diǎn)開(kāi)關(guān)
電路： 3 x 16:9
電壓電源： 單/雙電源
電壓 - 電源，單路/雙路(±)： 4.5 V ~ 5.5 V，±2.5V
電流 - 電源： 600mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 676-BGA
供應(yīng)商設(shè)備封裝： 676-BGA（27x27）
包裝： 管件
AD8176
Rev. 0 | Page 33 of 40
For each disabled RGB output channel, the quiescent
power supply current in VPOS and VNEG drops by approxi-
mately 34 mA.
QNPN
QPNP
VNEG
VPOS
VOUTPUT
IOUTPUT
IO, QUIESCENT
06
59
6-
02
5
Figure 51. Simplified Output Stage
Example
For the AD8176, with an ambient temperature of 85°C, all nine
RGB output channels driving 1 V rms into 100 Ω loads, and
power supplies at ±2.5 V, follow these steps:
1.
Calculate power dissipation of AD8176 using data sheet
quiescent currents. Neglecting VDD current, as it is
insignificant.
() (
VNEG
NEG
VPOS
POS
QUIESCENT
D
I
V
I
V
P
×
)
+
×
=
,
(5)
() ()
W
3
mA
600
V
5
.
2
mA
600
V
5
.
2
,
=
×
+
×
=
QUIESCENT
D
P
2.
Calculate power dissipation from loads. For a differential
output and ground-referenced load, the output power is
symmetrical in each output phase.
(
)
RMS
OUTPUT
RMS
OUTPUT
POS
OUTPUT
D
I
V
P
,
×
=
(6)
()
mW
15
Ω
100
/
V
1
V
1
V
5
.
2
,
=
×
=
OUTPUT
D
P
There are 27 output pairs, or 54 output currents.
W
81
.
0
mW
15
54
,
=
×
=
OUTPUT
D
nP
3.
Subtract quiescent output stage current for number of
loads (54 in this example). The output stage is either
standing or driving a load, but the current only needs to be
counted once (valid for output voltages > 0.5 V).
()
QUIESCENT
OUTPUT
NEG
POS
OUTPUT
DQ
I
V
P
,
×
=
(7)
()
mW
25
.
8
mA
65
.
1
V)
5
.
2
(
V
5
.
2
,
=
×
=
OUTPUT
DQ
P
There are 27 output pairs, or 54 output currents.
W
45
.
0
mW
25
.
8
54
,
=
×
=
OUTPUT
D
nP
4.
Verify that the power dissipation does not exceed the
maximum allowed value.
OUTPUT
DQ
OUTPUT
D
QUIESCENT
D
CHIP
ON
D
nP
P
,
+
=
(8)
W
36
.
3
W
45
.
0
W
81
.
0
W
3
,
=
+
=
CHIP
ON
D
P
From Figure 50 or Equation 2, this power dissipation is below
the maximum allowed dissipation for all ambient temperatures
up to and including 85°C.
In a general case, the power delivered by the digital supply and
dissipated into the digital output devices has to be taken into
account following a similar derivation. However, because the
loads driven by the H and V outputs are high and the voltage at
these outputs typically sits close either rail, the correction to the
on-chip power estimate is small. Furthermore, the H and V
outputs are active only briefly during sync generation and
returned to digital ground thereafter.
Short-Circuit Output Conditions
Although there is short-circuit current protection on the
AD8176 outputs, the output current can reach values of 80 mA
into a grounded output. Any sustained operation with too many
shorted outputs can exceed the maximum die temperature
and can result in device failure (see the Absolute Maximum
Ratings section).
Crosstalk
Many systems (such KVM switches) that handle numerous
analog signal channels have strict requirements for keeping the
various signals from influencing any of the other signals in the
system. Crosstalk is the term used to describe the coupling of
the signals of other nearby channels to a given channel.
When there are many signals in close proximity in a system, as
is undoubtedly the case in a system that uses the AD8176, the
crosstalk issues can be quite complex. A good understanding of
the nature of crosstalk and some definition of terms is required
to specify a system that uses one or more crosspoint devices.
Types of Crosstalk
Crosstalk can be propagated by means of any of three methods.
These fall into the categories of electric field, magnetic field,
and the sharing of common impedances. This section explains
these effects.
Every conductor can be both a radiator of electric fields and a
receiver of electric fields. The electric field crosstalk mechanism
occurs when the electric field created by the transmitter
propagates across a stray capacitance (for example, free space)
and couples with the receiver and induces a voltage. This
voltage is an unwanted crosstalk signal in any channel that
receives it.
Currents flowing in conductors create magnetic fields that
circulate around the currents. These magnetic fields then
generate voltages in any other conductors whose paths they
link. The undesired induced voltages in these other channels are
crosstalk signals. The channels that crosstalk can be said to have
a mutual inductance that couples signals from one channel to
another.
The power supplies, grounds, and other signal return paths
of a multichannel system are generally shared by the various
channels. When a current from one channel flows in one of
these paths, a voltage that is developed across the impedance
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