DAC39J84IAAVR datasheet(80/146 Pages) TI

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DAC39J84

SLASE48A – NOVEMBER 2014 – REVISED JANUARY 2015

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7.5.1.28 config27 Register – Address: 0x1B, Default: 0x0000

Figure 109. config27 Register Format

extref_ ena

dtest_ lane

dtest

reserved

atest

Table 58. config27 Register Field Descriptions

Addr

Default

Bit

Name

Function

Name

(Hex)

Value

config27

0x1B

extref_ ena

Allows the chip to use an external reference or the internal reference. (0=internal,

1=external)

14:12

dtest_ lane

Selects the lane to output the test signal. 0=lane0, 7=lane7

000

11:8

dtest

Allows digital test signals to come out the ALARM pin. 0000 : Test disabled, normal

0000

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

reserved

Reserved

5:0

atest

Selects measurement of various internal signals at the ATEST pin. 0=off

000000

000001 : DAC PLL VSSA (0V)

000010 : DAC PLL VDD 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 VDD at prescaler and mdivider (0.9V)

000110 : DAC PLL VSSA (0V)

000111 : DAC PLL VDDA1.8 (1.8V)

001000 : DAC PLL loop filter voltage (0 to 1V, ~0.5V when locked)

001001 : DACA VDDA18 (1.8V)

001010 : DACA VDDCLK (0.9)

001011 : DACA VDDDAC (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 VDDA18 (1.8V)

010010 : DACB VDDCLK (0.9)

010011 : DACB VDDDAC (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 VDDA18 (1.8V)

011010 : DACC VDDCLK (0.9)

011011 : DACC VDDDAC (0.9)

011100 : DACC VSSA (0V)

011101 : DACC VSSESD (0V)

011110 : DACC VSSA (0V)

011111 : DACC main current source PMOS cascode bias (1.65V)

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