DAC38J82_15 Datasheet, PDF (71/119 Pages) Texas Instruments – DAC3xJ82 Dual-Channel, 16-Bit, 1.6/2.5 GSPS, Digital-to-Analog Converters with 12.5 Gbps JESD204B Interface

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DAC37J82, DAC38J82
SLASE16B – JANUARY 2014 – REVISED MAY 2014
Register
Name
config27
Addr
(Hex)
0x1B
Table 58. Register Name: config27 – Address: 0x1B, Default: 0x0000
Bit Name
15 extref_ ena
14:12 dtest_ lane
11:8 dtest
7
reserved
6
reserved
5:0 atest
Function
Allows the chip to use an external reference or the internal reference. (0=internal,
1=external)
Selects the lane to output the test signal. 0=lane0, 7=lane7
Allows digital test signals to come out the ALARM pin. 0000 : Test disabled, normal
ALARM pin function
0001 : SERDES Block0 PLL clock/80
0010 : SERDES Block1 PLL clock/80
0011 : TESTFAIL (lane selected by dtest_lane)
0100 : SYNC(lane selected by dtest_lane)
0101 : OCIP (lane selected by dtest_lane)
0110 : EQUNDER (lane selected by dtest_lane)
0111 : EQOVER (lane selected by dtest_lane)
1000 – 1111 : not used
Reserved
Reserved
Selects measurement of various internal signals at the ATEST pin. 0=off
000001 : DAC PLL VSSA (0V)
000010 : DAC PLL VDDCLK09 at DACCLK receiver and ndivider (0.9V)
000011 : DAC PLL 100uA bias current measurement into 0V
000100 : DAC PLL 100uA vbias at VCO (~0.8V nmos diode)
000101 : DAC PLL VDDCLK09 at prescaler and mdivider (0.9V)
000110 : DAC PLL VSSA (0V)
000111 : DAC PLL VDDAPLL18 (1.8V)
001000 : DAC PLL loop filter voltage (0 to 1V, ~0.5V when locked)
001001 : DACA VDDAREF18 (1.8V)
001010 : DACA VDDCLK09 (0.9)
001011 : DACA VDDDAC09 (0.9)
001100 : DACA VSSA (0V)
001101 : DACA VSSESD (0V)
001110 : DACA VSSA (0V)
001111 : DACA main current source PMOS cascode bias (1.65V)
010000 : DACA output switch cascode bias (0.4V)
010001 : DACB VDDAREF18 (1.8V)
010010 : DACB VDDCLK09 (0.9)
010011 : DACB VDDDAC09 (0.9)
010100 : DACB VSSA (0V)
010101 : DACB VSSESD (0V)
010110 : DACB VSSA (0V)
010111 : DACB main current source PMOS cascode bias (1.65V)
011000 : DACB output switch cascode bias (0.4V)
011001 : DACC VDDAREF18 (1.8V)
011010 : DACC VDDCLK09 (0.9)
011011 : DACC VDDDAC09 (0.9)
011100 : DACC VSSA (0V)
011101 : DACC VSSESD (0V)
011110 : DACC VSSA (0V)
011111 : DACC main current source PMOS cascode bias (1.65V)
Default
Value
0
000
0000
0
0
000000
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