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Basic Information
Question 1
What kind of CCD/CIS sensor does the HT82V42 support?
Answer
The HT82V42 supports a 15MSPS single channel input which is suitable for middle and low speed CIS sensors.
Question 2
What is the difference between the HT82V42 and the HT82V36?
Answer
Both the HT82V42 and HT82V36 have a single channel input and a 3.3V analog power supply but they are not pin compatible. The HT82V42 uses a 20-pin SSOP package type and has a conversion speed of 15MSPS while the HT82V36 has a 28-pin SSOP package type and a conversion speed of 6MSPS. Generally speaking, the HT82V36 provides ultra-low power consumption of only 56mW typ., making it very suitable for USB bus-power scanner applications. The HT82V42, uses a 20-pin SSOP package type for better cost advantages and is suitable for CIS sensor scanner applications.
Question 3
Is there any device on the market pin compatible with the HT82V42?
Answer
The WM8253 from Wolfson and the RU6574FV from Rohm are pin and register compatible with the HT82V42. However note that the converting speed of the HT82V42 is 15MSPS while the WM8253 and RU6574FV is only 6MSPS.
Question 4
What are the differences between the HT82V2x, HT82V3x and HT82V4x series devices?
Answer
Basically the HT82V2x and HT82V3x are pin and register compatible while the HT82V4x is not compatible with these two series.
Question 5
What interface does the HT82V42 use to communicate with the back-end processor?
Answer
The HT82V42 uses a 4-wire serial interface to communicate with the back-end processor. The back-end processor is able to write and read the register with this interface to control all functions in the HT82V42 such as data format settings, channel gain, offset etc.
Question 6
Which type of CCD/CIS sensor does the HT82V38 support?
Answer
Basically the HT82V38 supports one, two or three channel input mode types. The number and order of channels can be controlled by internal configurations and the MUX register settings to match different CIS/CCD sensors.
Question 7
What is the difference between HT82V37 and the HT82V26A?
Answer
The digital power supply of the original scanner has been changed to 3.3V, however the analog power supply still uses 5V, as does the HT82V26A. The new generation of scanner designs, will both use 3.3V analog and digital power supplies to reduce costs. This is the case with the HT82V38 which has both analog and digital supplies both at 3.3V.
Question 8
Is there any device on the market pin compatible with the HT82V38?
Answer
Presently the HT82V26A and the AD9826 from Analog Device are compatible with the HT82V38 in terms of both pins and registers. However, note that both the HT82V26A and AD9826 use 5V analog power supplies and not 3.3V and there are still some differences from the HT82V38 in regard to timing control.
Question 9
What kind of interface does the HT82V38 use to communicate with the back-end processor?
Answer
The HT82V38 uses a 3-wire serial interface to communicate with the back-end processor. The back-end processor is able to write and read registers using this interface to control all functions in the HT82V38 such as data format settings, channel gain, offset etc.
Question 10
What CCD/CIS sensor types does the HT82V46 support?
Answer
Basically the HT82V46 supports 1, 2 and 3 channels input modes. The channel number and channel order can be setup using internal “Setup” register configurations to match different CIS/CCD sensors.
Question 11
What is the main difference between the HT82V46 and HT82V38?
Answer
Both the HT82V46 and HT82V38 have three analog processing channels with the same operating voltage of 3.3V and a 28-pin SSOP-209mil package type. The pins however are not compatible and nor are the control interfaces and registers. As for the conversion speed, the HT82V46 is 45MSPS, much faster than the HT82V38 which has a value of 30MSPS. For scanner applications, the HT82V46 is suitable for medium high speed applications while the HT82V38 is for medium speed applications.
Question 12
Is there any product pin-compatible with the HT82V46 on the market?
Answer
The pins and registers of the Wolfson WM8214 are compatible with the HT82V46, while the conversion speed of the HT82V46 is 45MSPS and the WM8214 is 40MSPS.
Question 13
What interface does the HT82V46 use to communicate with the backend processor?
Answer
The HT82V46 uses a 4-wire serial interface to communicate with the backend processor. The backend processor can access the registers through this interface and control all the functions in the hT82V46, such as data format, gain and offset settings.
Application Description
Question 1
Which CCD/CIS sensor types does the HT82V42 support?
Answer
The HT82V42 only supports the 25MSPS single channel input which is more suitable for CIS sensors of middle or low speed.
Points to Note
Question 1
What is the main difference between the HT82V46 and HT82V42?
Answer
Both the HT82V46 and HT82V42 have single channel inputs using a 3.3V analog power supply. The HT82V46 and HT82V42 are not pin compatible. The HT82V46 uses a 32-pin QFN package with a conversion speed of 25MSPS and the HT82V42 uses a 20-pin SSOP with a conversion speed of 15MSPS.
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