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2022-09-15 14:32:14
AD8646/AD8647/AD8648 is a 24 MHz rail pair -offer with a shutdown option
Feature
offset voltage: maximum 2.5 MV
Single power operation: 2.7 v to 5.5 v
Low noise: 8 nv/√Hz
[[ 123] Broadband: 24MHz
conversion rate: 11V/μs
Short -circuit output current: 120ma
Suitable for automobile applications
No phase reversal
Low input bias current: 1Pa
The low power supply current of each amplifier: 2 mia's largest unit gain stable
Application
battery power supply instrument
Multi -pole filter
ADC front end
Sensor
barcode scanner
ASIC input or output amplifier
Audio amplifier
Optical diode amplifier
Data path/multi -road reusrator/switch control
General description
AD8646 and AD8647 are dual -channel, while AD8648 It is a single -power amplifier of the four -way and rail -to -orbit, input and output, with low -dimensional voltage, width signal bandwidth, low input voltage and low -current noise. AD8647 also has a low power shutdown function.The combination of 24MHz bandwidth, low offset, low noise and extremely low input bias current makes these amplifiers useful in various applications. Filter, integrifiers, optoelectronic diode amplifiers and high impedance sensors have benefited from the combination of performance characteristics. The communication application benefits from broad band width and low distortion. See AD8646/AD8647/AD8648 to provide high output drive capabilities. This is a very good audio cable drive and other low impedance applications. AD8646 and AD8648 can be used for car applications (see ordering guidelines).
Applications include portable and low -power instruments, audio amplification, portable telephone headphones, barcode scanners and polar filters of portable phone headphones, barcode scanners. The ability to input and output rail enables designers to buffer CMOS ADC, DAC, ASIC and other wide output swing devices in a single power system.
pin configuration
Typical performance features
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Operation theory 
Power off operation 
The shutdown function of AD8647 is related to the negative power voltage of the operation amplifier. Logic electricity level ( gt; 2.0V) enables the device, and the logic electric low ( lt; 0.8V) will fail the device and cause the output to be in a high impedance state. Several outputs can be connected wired or #39; to eliminate multi -way relics. Logic input is a high -impedance CMOS input. If you use a dual power supply or split power supply, the logical signal must be correctly referred to the negative power voltage. 
Multi -road reuse operation
Because each operation amplifier has a separate logical input and enable pin. If only one operation amplifier can be activated at any time, the output can be connected to the connection Together. As shown in Figure 48, the multi -road releasing device can be eliminated through the connection operation. In the case of reasonable shortening switching time, the low -frequency signal path can be selected smoothly. The shutdown time is slightly faster than the opening time, so even if the parts from two different packages are used, the overlapping is less than 300 nan seconds.
1. Z u003d parts that meet ROHS
2. W u003d meet the requirements of car application. 
