AKM AK2571, Manual

Page: 30 / 52

AKM Confidential AK2571
7.2 Data construction
1) Temperature compensation data
Force the temperature compensation current on the output of DAC1-3 using the internal T_V converter. Digital MSB
4-bits of data from the T_V converter becomes the address of EEPROM and 5-bit (R_TV[3]) selects the 8-bits data whether
D15-D8 or D7-D0. Table 7-3 indicate the temperature compensation data format.
Table 7-3 Temperature compensation data
Address Data
Name Function A7, A6 A5, A4 A3-A0 D15-D8 D7-D0
E_DAC1_TV I-DAC1
Temperature
compensation
data
xx 00 0000
|
1111
E_DAC1_TV
[00001]
|
E_DAC1_TV
[11111]
E_DAC1_TV
[00000]
|
E_DAC1_TV
[11110]
E_DAC2_TV I-DAC2
Temperature
compensation
data
xx 01 0000
|
1111
E_DAC2_TV
[xxxx1] E_DAC2_TV
[xxxx0]
E_DAC3_TV I-DAC3
Temperature
compensation
data
xx 10 0000
|
1111
E_DAC3_TV
[xxxx1] E_DAC3_TV
[xxxx0]
(1) Setting data for each wavelength
Table 7-4 and 7-5 indicate the data construction for setting data of each wavelength.
Address is A3 toA0 ([A7:A6] is set by WAVE1, 0 and [A5, A4] is fixed [1,1])
Reg marked “1” indicate the existence of related register.
Table 7-4 setting data of each wavelength
Name Bit Function Reg A7-A4 A3-A0 Data Setting
E_PDGAIN 5 PDGAIN set 1 xx11 0000 D4-D0
00000: 0dB
11111: 21.7dB
0.7dB Step, Refer table3-3
E_PDMON_SET 3
PDMON output voltage
set
1 0000 D7-D5
000: 0.4V
111: 1.1V
0.1V Step, Refer table 3-2
E_ATC_OFFSET 6 ATC OFFSET set 1 0000 D15-D8
Refer Table 4-6, 4-7
000000: 0.3V
101000: 1.7V
29.7mV / Step
E_MON_DAC_FIX 8
MON_DAC output
fixed value
1 0001 D7-D0 Refer table 6-1
E_DAC1_GAIN 2 I-DAC1 Gain set 1 0010 D1-D0
Refer table 3-5
00: 1, 01: 1/2, 10: 1/4,
11: 1/12
E_DAC2_GAIN 2 I-DAC2 Gain set 1 0010 D3-D2
Refer table 3-6
00: 1, 01: 1/2, 10: 1/4
<Rev. 0.6E Preliminary> -30- 2001/11