AD5770R datasheet(29/59 Pages) AD

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Data Sheet

AD5770R

Rev. 0 | Page 29 of 59

Channel 1

Channel 1 can be set up to source 0 mA to 140 mA or 0 mA to

250 mA. The full-scale output range for Channel 1 must be set

by writing to the CH1_MODE bits of the OUTPUT_RANGE_

CH1 register. In addition to the 0 mA to 250 mA range, Channel 1

has two 0 mA to 140 mA ranges; the channel can be set up to

optimize for better noise and PSRR or for reduced headroom.

The configuration options for Channel 1 are listed in Table 8.

Channel 2

Channel 2 can be set up to source 0 mA to 55 mA or 0 mA to

150 mA. The full-scale output range for Channel 2 must be set

by writing to the CH2_MODE bits of the OUTPUT_RANGE_

CH2 register. Table 8 lists configuration options for Channel 2.

Channel 3 to Channel 5

Channel 3, Channel 4, and Channel 5 of the AD5770R can be set

up to source 0 mA to 45 mA or 0 mA to 100 mA. The full-scale

output rages for Channel 3, Channel 4, and Channel 5 must be

set by writing to the CH3_MODE, CH4_MODE, and

CH5_MODE bits of the OUTPUT_RANGE_CH3, OUTPUT_

RANGE_CH4, and OUTPUT_RANGE_CH5 registers. The

configuration options for Channel 3, Channel 4, and Channel 5

are listed in Table 8.

Table 8. Output Range Mode Register Setup

Channel

Mode Bit Name

Mode

Zero-Scale Output (mA)

Full-Scale Output (mA)1

Minimum

Headroom (mV)

Comments

Channel 0

CH0_MODE

0x0

300

450

0x1

−60

0x2

−60

300

4502

Channel 1

CH1_MODE

0x1

140

275

Low headroom

0x2

140

450

Low noise and PSRR

0x3

250

450

Channel 2

CH2_MODE

0x0

275

0x1

150

275

Channel 3

CH3_MODE

0x0

275

0x1

100

275

Channel 4

CH4_MODE

0x0

275

0x1

100

275

Channel 5

CH5_MODE

0x0

275

0x1

100

275

Output current scaling feature disabled. See the Output Current Scaling section for more information.

500 mV footroom from PVEE0 supply required when sinking current.

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