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| 型號： | ADA4800ACPZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CCD BUFFER HS LP 6LFCSP |
| 標(biāo)準(zhǔn)包裝： | 10,000 |
| 放大器類型： | 緩沖器 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 145 V/µs |
| -3db帶寬： | 400MHz |
| 電流 - 輸入偏壓： | 1µA |
| 電壓 - 輸入偏移： | 30000µV |
| 電流 - 電源： | 1.4mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 17 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 6-UFDFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 6-LFCSP-UD（1.6x1.6） |
| 包裝： | 帶卷 (TR) |
ADA4800
Rev. A | Page 10 of 16
THEORY OF OPERATION
The ADA4800 is a buffer integrated with an active load. Each
element (the active load and the buffer) operates independently,
as described in the following sections.
Figure 22 illustrates an ADA4800 application configuration for
using this power save feature.
An external resistor connected between the ISF and the
microcontroller GPO pin determines the amount of current
that flows into the input pin. This current can be calculated
by using Equation 1 and Equation 2.
SETTING ACTIVE LOAD CURRENT WITH PIN 6 (ISF)
The ISF pin is used to establish the value of the active current
load (IAL). Set the ISF current using Equation 1.
kΩ
3
V
55
.
1
+
=
ISF
R
V
I
(1)
SETTING BANDWIDTH WITH PIN 4 (IDRV)
The IDRV pin establishes the buffer’s ICC quiescent current.
As ICC is increased, power dissipation and bandwidth both
increase. Set the current using Equation 3.
where:
VISF is referenced to Pin 2. VISF can be an external voltage source,
VCC, or a GPO output as explained in the following paragraphs.
RISF is the external resistor between the ISF pin and VISF.
kΩ
28
V
8
.
0
+
=
IDRV
R
V
I
(3)
where:
VIDRV is referenced to Pin 2. VIDRV can be an external voltage
source or VCC.
RIDRV is the external resistor between the IDRV pin and VIDRV.
The active load current (into the IN pin) is directly proportional
to IISF and can be calculated by Equation 2.
IAL = IISF × 27
(2)
The ADA4800 allows for additional power savings by reducing
the active load current. The active load current can be logically
controlled by connecting the ISF pin to any general-purpose
output (GPO) pin of a system microcontroller through an
external resistor. A GPO logic high enables the flow of the
active load current. Appling –VS or connecting a high-Z to the
ISF pin places the ADA4800 into power save mode by shutting
down the active load current.
The ICC current is directly proportional to IIDRV and can be
calculated by Equation 4.
ICC = IIDRV × 26
(4)
Applying –VS to the IDRV pin shuts down the buffer.
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