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MFG:ADI  D/C:09  

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Part Number: AD7478A

 

MFG: ADI

 

D/C: 09

Description: The AD7476A/AD7477A/AD7478A are 12-bit, 10-bit and 8-bit, high speed, low power, successive-approximat...


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AD7478A General Description


The AD7476A/AD7477A/AD7478A are 12-bit, 10-bit and 8-bit, high speed, low power, successive-approximation ADCs respectively. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. The parts contain a low-noise, wide bandwidth track/hold amplifier which can handle input frequencies in excess of 6MHz.

The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipelined delays associated with the part.

The AD7476A/AD7477A/AD7478A use advanced design techniques to achieve very low power dissipation at high throughput rates.

The reference for the part is taken internally from VDD.This allows the widest dynamic input range to the ADC.Thus the analog input range for the part is 0 to VDD. The conversion rate is determined by the SCLK.

AD7478A Maximum Ratings

VDD to GND................................................-0.3 V to 7 V
Analog Input Voltage to GND......0.3 V to VDD + 0.3 V
Digital Input Voltage to GND....................0.3 V to 7 V
Digital Output Voltage to GND....0.3 V to VDD + 0.3 V
Input Current to Any Pin Except Supplies2.......±10 mA
Operating Temperature Range
   Commercial (A, B Grade).................40°C to +85°C
   Storage Temperature Range........65°C to +150°C
Junction Temperature..........................................150°C
SC70 Package
   JA Thermal Impedance...............................332°C/W
   JC Thermal Impedance..............................120°C/W
Lead Temperature, Soldering
   Vapor Phase (60 secs)................................. +215°C
   Infrared (15 secs)........................................ +220°C
ESD....................................................................... 4 KV

NOTES
1   Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2    Transient currents of up to 100 mA will not cause SCR latch up.

AD7478A Features

`Fast Throughput Rate: 1MSPS
`Specified for VDD of 2.35 V to 5.25 V
`Low Power:
    3 mW typ at 1MSPS with 3V Supplies
    12.5mW typ at 1MSPS with 5V Supplies
`Wide Input Bandwidth:70dB SNR at 100kHz Input Frequency
`Flexible Power/Serial Clock Speed Management
`No Pipeline Delays
`High Speed Serial Interface
`SPITM/QSPITM/MICROWIRETM/DSP Compatible
`Standby Mode: 1A max
`6-Lead SC70 Package

AD7478A Typical Application

·Battery-Powered Systems
   Personal Digital Assistants
   Medical Instruments
   Mobile Communications
·Instrumentation and Control Systems
·Data Acquisition Systems
·High-Speed Modems
·Optical Sensors

AD7478A Connection Diagram

AD7478A  Connection Diagram

AD7478A datasheet

AD7478A
PDF/DataSheet Download

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