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ISL58214
Threshold Block Diagram
N GAIN
THRESH-HI
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
The gain from I APC to I OUT
varies proportional to the
code in Reg 1-21(4-7)
VSO
OUTPUT
MIRROR
DRIVER
ISNK
I SINK
V HI
V LASER
V HEAD
WRITE THRESH
THRESH-L
7
6
5
4
3
2
1
THRESH
DAC
R IN
I TH
4
2
VSO
ISRC
0
R TH
V TH-IN
Reg2-27bit1 RegX-00bit7
0 0
0 1
1 0
1 1
ISRC
x
x
ISNK
LOWP
Threshold DAC
The THRESH DAC outputs a positive current into the net
resistance at the input of the I TH voltage-to-current converter
amplifier. The external V TH independently creates a voltage at
the input of the I APC amplifier. The net voltage at the input of the
I APC amplifier divided by R IN is defined as the APC amplifier
input current, even though the current is to ground. This input
current multiplied by the specified gain ITH GAIN gives the output
current IOUT TH . The Threshold amplifier gain varies from 0 to full
scale proportional to Reg 1-21-(4-7).
The 12-bit THRESH DAC register is CLKed when THRESH-H is
loaded to prevent glitches. It is designed to be a 12-bit monotonic
DAC.
When Reg 1-21 = 80h, the gain from I APC to I OUT is about
100mA/mA for any selected output channel.
If LOWP = 1, the threshold current is set to zero.
19
Threshold Current
The threshold current is approximately determined by
interpolation from data specs.
I OUT-THRESH = IOUT THRESH-DAC + IOUT THRESH-Ith
Where:
? IOUT THRESH-DAC ~= IOUT-R-DAC x THRESH MULT x R TH / (R TH +
R IN )
? IOUT THRESH-Ith ~= ITH GAIN x V TH-IN / (R TH + R IN )
? where:
IOUT-T-DAC Gives for example: 110mA.
R IN Gives for example: 1000 typ ohms.
ITH_GAIN Gives for example: 100 typ mA/mA.
THRESH MULT ~= THRESH DAC /4095, where THRESH DAC
The above equations assume a linear transfer function. At high
currents there are saturation effects. Below 1V headroom,
depending on the current, the predicted output will be less than
predicted.
FN6944.1
July 29, 2013
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