ADC 6 Spécifications télécharger pdf (Page 72)

ADC12D1800RF

SNAS518I –JULY 2011–REVISED JANUARY 2014

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Table 6-21. Bias Adjust

Addr: 6h (0110b) POR state: 1C2Eh

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name MPA(15:0)

POR 0 0 0 1 1 1 0 0 0 0 1 0 1 1 1 0

Bits 15:0 MPA(15:0): Max Power Adjust. This register must be written to 1C0Eh to achieve full rated performance for Fclk >

1.6GHz.

Table 6-22. DES Timing Adjust

Addr: 7h (0111b) POR state: 8142h

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name DTA(6:0) Res

POR 1 0 0 0 0 0 0 1 0 1 0 0 0 0 1 0

Bits 15:9 DTA(6:0): DES Mode Timing Adjust. In the DES Mode, the time at which the falling edge sampling clock samples relative to

the rising edge of the sampling clock may be adjusted; the automatic duty cycle correction continues to function. See Input

Control and Adjust for more information. The nominal step size is 30fs.

Bits 8:0 Reserved. Must be set as shown.

Table 6-23. Reserved

Addr: 8h (1000b) POR state: 0F0Fh

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name Res

POR 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1

Bits 15:0 Reserved. Must be set as shown.

Table 6-24. Reserved

Addr: 9h (1001b) POR state: 0000h

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name Res

POR 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Bits 15:0 Reserved. Must be set as shown.

Table 6-25. Q-channel Offset Adjust

Addr: Ah (1010b) POR state: 0000h

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name Res OS OM(11:0)

POR 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Bits 15:13 Reserved. Must be set to 0b.

Bit 12 OS: Offset Sign. The default setting of 0b incurs a positive offset of a magnitude set by Bits 11:0 to the ADC output. Setting

this bet to 1b incurs a negative offset of the set magnitude.

Bits 11:0 OM(11:0): Offset Magnitude. These bits determine the magnitude of the offset set at the ADC output (straight binary coding).

The range is from 0 mV for OM(11:0) = 0d to 45 mV for OM(11:0) = 4095d in steps of ~11 µV. Monotonicity is specified by

design only for the 9 MSBs.

Code Offset [mV]

0000 0000 0000 (default) 0

1000 0000 0000 22.5

1111 1111 1111 45

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