M52957AFP Datasheet, PDF (6/14 Pages) Hitachi Semiconductor – Distance Detection Signal Processing for 3V Supply Voltage

M52957AFP
• *1 : Set up the logic control terminal, correspond to the parameter.
• *2 : Change ratio between the first integration current and the second integration current at a voltage of CINT that
is {CINT reference voltage(VCINT)-0.1V} and 1V.
The first integration current (CINT=1V)
∆I ^{CI 1=( 1 -}
) X 100%
The first integration current (CINT=VCINT-0.1V)
∆I^CI 2=( 1 - ^{The second integration current (CINT=1V)}
) X 100%
The second integration current (CINT=VCINT-0.1V)
• *3 : Connect the resistance of 120ΚΩ instead of PSD and establish current output from PHOTO COUPLER
correspond to the parameter. And input the varied resistance ratio. And measure the pulse width of SOUT output at
that time, obtain AFslope and AF linearity from the equations below.
Input condition1: IPSD (Stationary light current)=0 I1+I2=100nA
Input condition2: IPSD (Stationary light current)=0 I1+I2=50nA
Input condition3: IPSD (Stationary light current)=10µA I1+I2=100nA
D(9 : 1) • • • The pulse width of SOUT output at input with I1:I2=9:1
D(6 : 4) • • • The pulse width of SOUT output at input with I1:I2=6:4
D(3 : 7) • • • The pulse width of SOUT output at input with I1:I2=3:7
AF slope : DAF = D(9 : 1) - D(7 : 3)
AF linearity : L(AF) = (D(9 : 1) - D(6 : 4)) / (D(6 : 4) - D(7 : 3))
PSD quite resistance : 120KΩ
• *4 : The input current of one side channel when stationary light remove circuit and I/V transform AMP is not
saturated.
Rev.1.0, Sep.19.2003, page 6 of 13