DAC39J82 Datasheet, PDF (90/144 Pages) Texas Instruments – Resolution: 16-Bit

DAC39J82
SLASE47 – JANUARY 2015
7.5.1.50 config49 Register – Address: 0x31, Default: 0x0000
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15
7
Register
Name
config49
Figure 130. config49 Register Format
14
lockdet_ adj
6
13
5
pll_n
12
pll_reset
4
11
pll_
ndivsync_ena
3
10
pll_ena
2
9
8
pll_cp
1
0
memin_pll_lfvolt
Addr
(Hex)
0x31
Bit
15:13
12
11
10
9:8
7:3
2:0
Table 79. config49 Register Field Descriptions
Name
Function
Default
Value
lockdet_ adj
Adjusts the sensitivity of the DAC PLL lock detector; 4 settings from 000
000
to 011. The 011 setting has the widest lock detection window, tolerating
more jitter while reporting a lock. The 000 setting has a narrow window
and will indicate an unlocked state more often.
pll_reset
When set, the M divider, N divider and PFD are held reset.
0
pll_ ndivsync_ena When on, the SYSREF input is used to sync the N dividers of the PLL.
0
pll_ena
Enables the PLL output as the DAC clock when set; the clock provided at
the DACCLKP/N is used as the PLL reference clock. When cleared, the
PLL is bypassed and the clock provided at the DACCLKP/N pins is used
as the DAC clock
0
FUSE
controlled
pll_cp
Must be set to 00 for proper PLL operation
00
pll_n
Reference clock divider; divide by is N+1
00000
memin_pll_lfvolt
Indicates the loop filter voltage; 111 is max, 000 is min. When the PLL is
correctly programmed, this will read 011 or 100 for a centered loop filter
voltage.
000
READ
ONLY
7.5.1.51 config50 Register – Address: 0x32, Default: 0x0000
Figure 131. config50 Register Format
15
14
13
12
11
10
9
8
PLL_M
7
6
5
4
3
2
1
0
PLL_P
reserved
Register
Name
config50
Addr
(Hex)
0x32
Table 80. config50 Register Field Descriptions
Bit Name
15:8 PLL_M
7:4 PLL_P
3:0 reserved
Function
VCO feedback divider; divide by is M+1
VCO prescaler divider;
0000 : div by 2
0001 : div by 3
0010 : div by 4
0011 : div by 5
0100 : div by 6
0101 : div by 7
0110 : div by 8
0111 : div by 9
1000 : div by 4
1001 : div by 6
1010 : div by 8
1011 : div by 10
1100 : div by 12
Reserved
Default
Value
00000000
0000
0000
90
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