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參數(shù)資料
| 型號： | MAX4388 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers with High-Speed Disable |
| 中文描述： | +3V/+5V、250MHz、SOT23封裝ADC緩沖放大器，帶有高速禁止功能 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 377K |
| 代理商： | MAX4388 |
M
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
12
______________________________________________________________________________________
R
G
R
F
R
S
C
I
C
I
MAX4285
MAX4286
MAX4287
MAX4288
MAX4387
MAX4388
Figure 1. Using an Isolation Resistor (R
S
) for High Capacitive
Loads
For example, a noninverting gain-of-two configuration
(R
F
= R
G
) using 1k
resistors, combined with 2pF typi-
cal amplifier input capacitance, generates a pole at
159MHz. Since this pole is within the amplifier band-
width, it jeopardizes stability. Reducing these 1k
resistors to 100
extends the pole frequency to
1.59GHz, but affects output swing by adding 200
in
parallel with the amplifier
’
s load resistor. The typical
value for R
F
is 300
.
Layout and Power-Supply Bypassing
These amplifiers operate from a single +2.85V to +6.5V
power supply or from ±1.425V to ±3.25V dual supplies.
For single-supply operation, bypass V
CC
to ground with
a 0.1nF capacitor as close to the pin as possible, with a
0.1μF capacitor in parallel. If operating with dual sup-
plies, bypass each supply with capacitors to ground.
Observe the following guidelines:
A solid ground plane is essential for good high-fre-
quency behavior.
Where possible, use multiple ground vias.
Use a PC board with at least two layers. Avoid
areas of unreferenced copper-clad.
Keep signal traces as short and as straight as pos-
sible. Do not make sharp turns; round all trace
corners.
Use a constant-impedance board design if possi-
ble.
High-Speed Disable
The MAX4285/MAX4286/MAX4288 and MAX4388 fea-
ture a disable (DISABLE_) input that places the amplifi-
er in a low-power, high-output-impedance state. When
DISABLE_ is asserted, the amplifier
’
s output impedance
is typically 35k
. This high output impedance, com-
bined with the low 2pF output capacitance, make these
devices ideal for ADC input multiplexing applications or
switch applications. Typical enable/disable times are
40ns/50ns.
Output Capacitive Loading and Stability
These op amps are optimized for AC performance.
They are not designed to drive highly reactive loads,
which decrease phase margin and may produce
excessive ringing and oscillation. A small isolation
resistor (usually 20
to 30
) placed before the reactive
load reduces possible ringing and oscillation (Figure
1). At higher capacitive loads, AC performance is
dependent on the interaction of the load capacitance,
the isolation resistor, and on-board layout.
Output Drive Capability
The MAX4285
–
MAX4288 and MAX4387/MAX4388 have
an output sink capability of 106mA and a source capa-
bility of 77mA. This high current ability allows them to
drive low-impedance and dynamic-impedance ADC
inputs. The linear output range of these devices is (V
EE
+ 0.4V) to (V
CC
- 0.4V). Operation beyond this range is
not recommended due to reduced gain and phase
margin.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4285ESA | +3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers with High-Speed Disable |
| MAX4285EUT-T | +3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers with High-Speed Disable |
| MAX4285 | +3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers with High-Speed Disable |
| MAX4286 | +3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers with High-Speed Disable |
| MAX4286ESA | +3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers with High-Speed Disable |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4388ESD | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4388ESD+ | 功能描述:運算放大器 - 運放 3V/5V 250MHz ADC Buffer Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4388ESD+T | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4388ESD-T | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4388EUB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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