IC-HT datasheet(24/42 Pages) ICHAUS

24 / 42 page

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iC-HT

DUAL CW LASER DIODE DRIVER

Rev A1, Page 24/42

10 Bit

8 Bit

10 Bit

ACC

APC

RACC1

..10 nF..

255

PLR1

CI1

..750mA

8 Bit

LASER CHANNEL 1

MRL1

MDA1

AGND1

CIL1

CI1

LDK1

DCO

ECIE1

VDD

LDK1

ADSNF1

OVC1

DISP1

EMC

CI1

..750mA

Figure 13: ACC with monitor photodiode

10 BIT LOGARITHMIC D/A CONVERTER

The 10 bit logarithmic D/A converter is used for set-

ting the regulator´s voltage reference. The D/A con-

verter is active in all operating modes. In iC-WK mode

only two values are available: 0.25 V (setting INS/WKR

pin lo) and 0.5 V (setting INS/WKR pin hi). In MCU

mode both APC and ACC use the D/A converter. With

a range from 0.1 V to 1.1 V and the typical step width

is 0.235%.

The D/A converter is conﬁgured through register

REFx(9:0). With REFx(9:0) = 0x000, D/A output value

is set to 0.1 V, and for REFx(9:0) = 0x3FF, D/A output

is conﬁgured to 1.1 V.

REF1

Addr. 0x13/14; bit 9:0

R/W 0x000

0x000

Channel 1 regulator reference voltage set to

minimum voltage

. . .

Channel 1 regulator reference voltage set to

Vref = Vref0(1 +

∆

Vref (%)

100

)n+1, n from 0 to 1023

0x3FF

Channel 1 regulator reference voltage set to

maximum voltage

Table 49: Channel 1 regulator voltage reference

REF2

Addr. 0x18/19; bit 9:0

R/W 0x000

0x000

Channel 2 regulator reference voltage set to

minimum voltage

. . .

Channel 2 regulator reference voltage set to

Vref = Vref0(1 +

∆

Vref (%)

100

)n+1, n from 0 to 1023

0x3FF

Channel 2 regulator reference voltage set to

maximum voltage

Table 50: Channel 2 regulator voltage reference

To calculate the D/A converter value for each REFx

value, use the following formular:

Vref = Vref0(1 +

∆

Vref (%)

100

)n+1, n from 0 to 1023

Where Vref0 is the minimum value (typically 0.1 V),

∆

Vref (%) is the step value (typically 0.235 %) and n

is the value of REFx register in decimal.

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