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參數(shù)資料
| 型號(hào)： | ADA4855-3YCP-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADA4855-3YCP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 每 IC 通道數(shù)： | 3 - 三 |
| 放大器類型： | 電壓反饋 |
| 板類型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 16-LFCSP 封裝 |
ADA4855-3
Data Sheet
Rev. A | Page 16 of 20
RGB VIDEO DRIVER
Figure 51 shows a typical RGB driver application using dual
supplies. The gain of the amplifier is set at +2, where RF = RG =
1 kΩ. The amplifier inputs are terminated with shunt 75 Ω
resistors, and the outputs have series 75 Ω resistors for proper
video matching. In Figure 51, the PD pin is not shown connected
to any signal source for simplicity. If the power-down function
is not used, it is recommended that the PD pin be tied to the
positive supply or be left floating (not connected).
ADA4855-3
07
68
5-
0
51
PD
16
15
14
13
5
6
7
8
12
11
10
9
1
2
3
4
0.1F
10F
0.1F
+
0.1F
10F
+
75
1k
1k 1k
75
1k
75
–VS
+VS
VOUT (R)
VIN (R)
VIN (G)
VIN (B)
VOUT (G)
VOUT (B)
Figure 51. RGB Video Driver
DRIVING MULTIPLE VIDEO LOADS
Each amplifier in the ADA4855-3 can drive up to three video
loads simultaneously, as shown in Figure 52. When driving
three video loads, the ADA4855-3 maintains its excellent
performance for 0.1 dB flatness and 3 dB bandwidth. Figure 53
shows the large signal frequency response of the ADA4855-3
with three different load configurations: 150 Ω, 75 Ω and 50 Ω.
07
68
5-
05
2
75
CABLE
75
CABLE
75
VOUT2
VOUT1
–VS
+VS
VIN
0.1F
10F
75
CABLE
75
CABLE
75
VOUT3
+
–
RF
1k
RG
1k
ADA4855-3
0.1F
Figure 52. Video Driver Schematic for Triple Video Loads
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
110
100
M
A
G
NI
T
UDE
(d
B)
FREQUENCY (MHz)
200
RL =150
VOUT =2V p-p
G = 2
RL =75
RL =50
07
68
5-
15
3
Figure 53. Large Signal Frequency Response vs. Loads
PD (POWER-DOWN) PIN
The ADA4855-3 is equipped with a PD (power-down) pin
for all three amplifiers. This allows the user to reduce the
quiescent supply current when an amplifier is inactive. The
power-down threshold levels are derived from the voltage
applied to the +VS pin. When used in single-supply applications,
this is especially useful with conventional logic levels. The
amplifier is enabled when the voltage applied to the PD pin is
greater than +VS 1.25 V. In a single-supply application, the
voltage threshold is typically +3.75 V, and in a ±2.5 V dual-
supply application, the voltage threshold is typically +1.25 V.
The amplifier is also enabled when the PD pin is left floating (not
connected). However, the amplifier is powered down when the
voltage on the PD pin is lower than 2.5 V from +VS. If the PD
pin is not used, it is best to connect it to the positive supply.
Table 7. Power-Down Voltage Control
PD Pin
5 V
±2.5 V
3 V
Not Active
>3.75 V
>1.25 V
>1.75 V
Active
<2 V
<0 V
<1 V
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| ADA4855-3YCPZ-RL | 功能描述:IC OPAMP VF R-R TRPL LP 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
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| ADA4856-3YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4856-3YCP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:* 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
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