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XRD9855

Features: ·10-Bit Resolution ADC·18 - 27MHz Maximum Sampling Rate·Correlated Double Sampling (CDS)·Programmable Gain from 6dB to 38dB (PGA)·Digitally Controlled Analog Offset-Calibration·CCD Black Level Offset Compensation at FrameRate·CDS Clocks Sample Rising Edge or Falling Edge·Single 5V or 3V ...

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SeekIC No. : 004549361 Detail

XRD9855: Features: ·10-Bit Resolution ADC·18 - 27MHz Maximum Sampling Rate·Correlated Double Sampling (CDS)·Programmable Gain from 6dB to 38dB (PGA)·Digitally Controlled Analog Offset-Calibration·CCD Black L...

XRD9855 Data Sheet

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Part Number:
XRD9855
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/7

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Product Details

Description



Features:

·10-Bit Resolution ADC
·18 - 27MHz Maximum Sampling Rate
·Correlated Double Sampling (CDS)
·Programmable Gain from 6dB to 38dB (PGA)
·Digitally Controlled Analog Offset-Calibration
·CCD Black Level Offset Compensation at FrameRate
·CDS Clocks Sample Rising Edge or Falling Edge
·Single 5V or 3V Power Supply
·Low Power for Battery Applications:
  XRD9855/56: 250/300m W @ VDD = 5.0V
  XRD98L55/L56: 120/150mW @ VDD = 3.0V
·50mA-Typ Current in Stand By Model
·3-State Digital Outputs
l ESD Protection to Over 2000V


Application

·Digital Video Camcorders
·Digital Still Cameras
·PC Video Teleconferencing
·Digital Copiers
·Infrared Image Digitizers
·CCD/CIS Imager Interface
·CCTV/Security Camera
·2D Bar Code Readers
·Industrial Cameras


Pinout

Connection Diagram


Specifications

VDD to GND +7.0V
VRT to  VRB VDD ..............................+0.5 to GND -0.5V
VIN ...........................................VDD +0.5 to GND -0.5V
All Inputs .................................VDD +0.5 to GND -0.5V
All Outputs ...............................VDD +0.5 to GND -0.5V
Storage Temperature ............................-65 to 150
Lead Temperature (Soldering 10 seconds) .........300
Maximum Junction Temperature .........................150
Package Power Dissipation Ratings (TA= +70)
TQFP .......................................................JA = 54/W
ESD.....................................................................2000V

Notes:

1 Stresses above those listed as "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation at or above this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
2 Any input pin which can see a value outside the absolute maximum ratings should be protected by Schottky diodeclamps (HP50822835) from input pin to the supplies. All inputs have protection diodes which will protect thedevice from short transients outside the supplies of less than 100mA for less than 100µs. 3 VDD refers to AVDD and DVDD. GND refers to AGND and DGND.


Description

The XRD9855/XRD9856 are complete CCD Image Digitizers for digital cameras. The products include a high bandwidth differential Correlated Double Sampler (CDS), 8-bit digitally Programmable Gain Amplifier (PGA), 10-bit Analog-to-Digital Converter (ADC) and digital controlled black level auto-calibration circuitry.

The Correlated Double Sam pler(CDS) subtracts the CCD output signal black level from the video level. Com m on m ode signal noise and power supply noise are rejected by the differential CDS input stage. CDS inputs are designed to be used either differential or singleended.

The auto calibration circuit com pensates for any internal offset ofthe XRD9855/XRD9856 as well as black level offsetfrom the CCD.

The PGA is digitally controlled with 8-bit resolution on a linear dB scale, resulting in a gain range of 6dB to 38dB with 0.125dB per LSB of the gain code.

The PGA and black level auto-calibration are controlled through a simple 3-wire serial interface. The timing circuitry is designed to enable users to select a wide variety of available CCD and image sensors for their applications.
The XRD9855/XRD9856 has direct access to the PGA output and ADC input through the pin TESTVIN.

The XRD9855/XRD9856 are packaged in 48-lead surface mount TQFP to reduce space and weight, and suitable for hand-held and portable applications.




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