ADS5400IPZP datasheet(20/48 Pages) TI

20 / 48 page

ADS5400

SLAS611B – OCT 2009 – REVISED MARCH 2010

www.ti.com

Table 8. Serial Register 0x02 (Read or Write)

Address (hex)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Single or

0x02

Coarse Clock Phase Adjustment bits<4:0>

Clock Divider

Dual Bus

Defaults

BIT <0>

Single or Dual Bus Output Selection

dual bus output (A and B)

single bus output (A)

BIT <1>

Output Clock Divider

CLKOUT equals CLKIN divide by 4 (not available in single bus mode)

CLKOUT equals CLKIN divide by 2

BIT <2>

RESERVED

set to 0 if writing this register

do not set to 1

BIT <7:3>

Input Clock Coarse Phase Adjustment

Use as a coarse adjustment of input clock phase. The 5-bit adjustment

provides a step size of ~2.4ps across a range from code 00000 = 0 ps

to code 11111 = 73ps.

Table 9. Serial Register 0x03 (Read or Write)

Address (hex)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Analog Offset

0x03

Fine Clock Phase Adjustment bits<5:0>

bit<8>

Defaults

factory set

BIT <0>

Analog Offset control (most significant bit of 9-bit word)

All 9-bits in this adjustment in address 0x03 and 0x04 set to 0 0000

0000 = -30mV (TBD)

All 9-bits in this adjustment in address 0x03 and 0x04 set to 1 1111

1111 = +30mV (TBD)

Step adjustment resolution is 120µV (or 1/4 LSB). Adjustments can be

used for calibration of analog signal path offset (for instance offset

error induced outside of the ADC) or to match multiple ADC offsets.

The default setting for this register is factory set to provide ~0mV of

ADC offset in the output codes and is unique for each device.

BIT <1>

RESERVED

set to 0 if writing this register

do not set to 1

BIT <7:2>

Fine Clock Phase Adjustment

Use as a fine adjustment of the input clock phase. The 6-bit

adjustment provides a step resolution of ~116fs across a range from

code 000000 = 0ps to code 111111 = 7.4ps. Can be used in conjuction

with Coarse Clock Phase Adjustment in address 0x02.

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