DAC39J82 Datasheet, PDF (79/144 Pages) Texas Instruments – Resolution: 16-Bit

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Register
Name
config27
(continued)
Addr
(Hex)
0x1B
DAC39J82
SLASE47 – JANUARY 2015
Table 57. config27 Register Field Descriptions (continued)
Bit Name
5:0 atest
Function
100000 : DACC output switch cascode bias (0.4V)
100001 : DACD VDDA18 (1.8V)
100010 : DACD VDDCLK (0.9)
100011 : DACD VDDDAC (0.9)
100100 : DACD VSSA (0V)
100101 : DACD VSSESD (0V)
100110 : DACD VSSA (0V)
100111 : DACD main current source PMOS cascode bias (1.65V)
101000 : DACD output switch cascode bias (0.4V)
101001 : Temp Sensor VSSA (0V)
101010 : Temp Sensor amplifier output (0 to 1.8V)
101011 : Temp Sensor reference output (~0.6V, can be trimmed)
101100 : Temp Sensor comparator output (0 to 1.8V)
101101 : Temp Sensor 64uA bias voltage (~0.8V nmos diode)
101110 : BIASGEN 100uA bias measured to 0V (to be trimmed)
101111 : Temp Sensor VDD (0.9V)
110000 : Temp Sensor VDDA18 (1.8V)
110001: DAC bias current measured into 1.8V. scales with coarse DAC setting (7.3µA to
117µA)
110010: Bangap PTAT current measured into 0V (~20µA)
110011: CoarseDAC PMOS current source gate (~1V)
110100: RBIAS (0.9V)
110101: EXTIO (0.9V)
110110: Bandgap PMOS cascode gate (0.7V)
110111: Bandgap startup circuit output (~0V when BG started)
111000: Bandgap output (0.9V, can be trimmed)
111001: SYNCB LVDS buffer reference voltage (1.2V) must set syncb_lvds_efuse_sel to
measure.
111010: VSS in digital core MET1 (0V)
111011: VSS in digital core MET1 (0V)
111100: VSS near bump (0V)
111101: VDDDIG in digital core MET1 (0.9V)
111110: VDDDIG in digital core MET1 (0.9V)
Default
Value
000000
7.5.1.29 config28 Register – Address: 0x1C, Default: 0x0000
Figure 109. config28 Register Format
15
14
13
12
11
10
9
8
reserved
7
6
5
4
3
2
1
0
reserved
Register
Name
config28
Addr
(Hex)
0x1C
Table 58. config28 Register Field Descriptions
Bit Name
15:8 reserved
7:0 reserved
Function
reserved
reserved
Default
Value
0x00
0x00
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