Datasheet

AD5560 Data Sheet
Rev. D | Page 34 of 68
V
MIN
is another inportant voltage level that is used in other
parts of the circuit. When using a MEASOUT gain of 0.2, the
V
MIN
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 V
MIN
level is not impinged
on (the high voltage DAC amplifiers used here require
approximately 2 V footroom to AV
SS
). See the Choosing
AV
DD
/AV
SS
Power Supply Rails section for more information.
V
MIN
= −5.125 × VREF × (OFFSET_DAC_CODE/2
16
)
Table 9. MEASOUT Output Ranges
MEASOUT Function
GAIN1 = 0, MEASOUT Gain = 1 Transfer Function
Output Voltage Range
1
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
(I
DUT
× R
SENSE
× 20) + V
MID
0 V to 25.62 V ±12.81 V −22.42 V to +3.2 V
GAIN0 = 1
MI gain = 10 (I
DUT
× R
SENSE
× 10) + V
MID
0 V to 12.81 V
(V
REF
= 2.5 V)
±6.4 V
(V
REF
= 2.5 V)
−11.2 V to +1.6 V
(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 Range
1, 2
Measure Voltage (MV)
MV = 0.2 × (V
DUT
− V
MIN
) 0 V to 5.12 V (±2.56 V centered around 2.56 V)
(includes overrange)
Measure
Current
(MI)
GAIN0 = 0
MI gain = 20 (I
DUT
× R
SENSE
× 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
(I
DUT
× R
SENSE
× 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)
(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 AD5560
1
Part
No. Resolution
Sample
Rate Channels AIN Range
2
Interface ADC Driver Multiplexer
3
Package
AD7685 16 250 kSPS 1 0 to VREF Serial, SPI ADA4841-x ADG704, ADG708 M S O P,
LFCSP
AD7686 16 500 kSPS 1 0 to VREF Serial, SPI ADA4841-x ADG704, ADG708 M S O P,
LFCSP
AD7693 16 500 kSPS 1 −VREF to +VREF Serial, SPI ADA4841-x,
ADA4941-1
ADG1404,
ADG1408,
ADG1204
M S O P,
LFCSP
AD7610 16 250 kSPS 1 Bipolar 10 V, bipolar
5 V, unipolar 10 V,
unipolar 5 V
Serial, parallel AD8021 AD1404, ADG1408,
ADG1204
LFCSP,
LQFP
AD7655 16 1 MSPS 4 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.