AD5560JBCZ datasheet(34/68 Pages) AD

34 / 68 page

AD5560

Data Sheet

Rev. D | Page 34 of 68

VMIN is another inportant voltage level that is used in other

parts of the circuit. When using a MEASOUT gain of 0.2, the

VMIN level is used to scale the voltage range; therefore, when

choosing supply rails, it is very important to ensure that there

is sufficient footroom so that the VMIN level is not impinged

on (the high voltage DAC amplifiers used here require

approximately 2 V footroom to AVSS). See the Choosing

AVDD/AVSS Power Supply Rails section for more information.

VMIN = −5.125 × VREF × (OFFSET_DAC_CODE/216)

Table 9. MEASOUT Output Ranges

MEASOUT Function

GAIN1 = 0, MEASOUT Gain = 1

Transfer Function

Output Voltage Range1

Offset DAC =

0x0

Offset DAC = 0x8000

Offset DAC = 0xE000

Measure Voltage (MV)

±V

DUT

0 V to 25.62 V

±12.81 V

−22.42 V to +3.2 V

Measure

Current

(MI)

GAIN0 = 0

MI gain = 20

DUT × RSENSE × 20) + VMID

0 V to 25.62 V

±12.81 V

−22.42 V to +3.2 V

GAIN0 = 1

MI gain = 10

DUT × RSENSE × 10) + VMID

0 V to 12.81 V

REF = 2.5 V)

±6.4 V

REF = 2.5 V)

−11.2 V to +1.6 V

REF = 2.5 V)

1 VREF = 5 V, unless otherwise noted.

Table 10.

MEASOUT Function

GAIN1 = 1, MEASOUT Gain = 0.2

Transfer Function

Output Voltage Range1, 2

Measure Voltage (MV)

MV = 0.2 × (V

DUT − VMIN)

0 V to 5.12 V (±2.56 V centered around 2.56 V)

(includes overrange)

Measure

Current

(MI)

GAIN0 = 0

MI gain = 20

DUT × RSENSE × 20 × 0.2) + 0.5125 × VREF

0 V to 5.12 V (±2.56 V centered around 2.56 V)

(includes overrange)

GAIN0 = 1

MI gain = 10

DUT × RSENSE × 10 × 0.2) + 0.5125 × VREF

1.28 V to 3.84 V (±1.28 V, centered around 2.56 V)

0 V to 2.56 V (±1.28 V, centered around 1.28 V)

REF = 2.5 V)

1 VREF = 5 V, unless otherwise noted.

2 The offset DAC setting has no effect on the output voltage range.

Table 11. Possible ADCs and ADC Drivers for Use with AD55601

Part

No.

Resolution

Sample

Rate

Channels

AIN Range2

Interface

ADC Driver

Multiplexer3

Package

AD7685

250 kSPS

0 to VREF

Serial, SPI

ADA4841-x

ADG704, ADG708

MSOP,

LFCSP

AD7686

500 kSPS

0 to VREF

Serial, SPI

ADA4841-x

ADG704, ADG708

MSOP,

LFCSP

AD7693

500 kSPS

−VREF to +VREF

Serial, SPI

ADA4841-x,

ADA4941-1

ADG1404,

ADG1408,

ADG1204

MSOP,

LFCSP

AD7610

250 kSPS

Bipolar 10 V, bipolar

5 V, unipolar 10 V,

unipolar 5 V

Serial, parallel

AD8021

AD1404, ADG1408,

ADG1204

LFCSP,

LQFP

AD7655

1 MSPS

0 V to 5 V

Serial, SPI

ADA4841-x/

AD8021

LQFP,

LFCSP

1 Subset of the possible ADCs, ADC drivers, and multiplexers suitable for use with the AD5560. Visit http://www.analog.com for more options.

2 Do not allow the MEASOUT output range to exceed the AIN range of the ADC.

3 For the purposes of sharing ADCs among multiple DPS channels, note that the multiplexer is not absolutely necessary because the AD5560 MEASOUT path has a

tristate mode.

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