ADA4254ACPZ-R7 datasheet(56/59 Pages) AD

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ADA4254

Data Sheet

Rev. B | Page 56 of 59

EXCITATION CURRENT CONFIGURATION REGISTER (EX_CURRENT_CFG) DETAILS

Table 33. EX_CURRENT_CFG Register Details (Register 0x0F)

Bit Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

EX_CURRENT_SEL[1:0]

Reserved

EX_CURRENT[3:0]

Access

Reserved

Reset

Reserved

VDDH

AVDD

IOUT_HV

EX_CURRENT_SEL[1:0]

EX_CURRENT[3:0]

IOUT_LV

Figure 110. Excitation Current Connectivity

Bits[7:6], EX_CURRENT_SEL[1:0]—Excitation Current

Connection Configuration

EX_CURRENT_SEL[1:0] configures an internal current source

to either IOUT_LV or IOUT_HV. Table 34 shows all available

configurations. When IOUT_LV is used, the source of this

current is AVDD. When IOUT_HV is used, the source of this

current is VDDH.

Table 34. Excitation Current Source Connections

EX_CURRENT_SEL[1:0]

Current Source

0b00

None

0b01

IOUT_LV

0b10

IOUT_HV

0b11

IOUT_LV

Bits[3:0], EX_CURRENT[3:0]—Excitation Current Value

The EX_CURRENT[3:0] bits configure the current source

value connected via EX_CURRENT_SEL. Table 35 shows all

the possible current values.

Table 35. Excitation Current Values

EX_CURRENT[3:0]

Excitation Current Value

0x0

0 μA

0x1

100 μA

0x2

200 μA

0x3

300 μA

0x4

400 μA

0x5

500 μA

0x6

600 μA

0x7

700 μA

0x8

800 μA

0x9

900 μA

0xA

1 mA

0xB

1.1 mA

0xC

1.2 mA

0xD

1.3 mA

0xE

1.4 mA

0xF

1.5 mA

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