AD5522_07 Datasheet, PDF (36/48 Pages) Analog Devices – Quad Parametric Measurement Unit With Integrated 16-Bit Level Setting DACs

AD5522
Preliminary Technical Data
DAC Addressing
For the FIN and Comparator (CPH & CPL) DACs, there are sets of x1, m and c registers for each current range and for the voltage range,
but only two sets for the Clamp function (CLL and CLH).
When calibrating the device, m and c registers allow volatile storage of offset and gain coefficients. Calculation of the corresponding DAC
x2 register only occurs when x1 data is loaded (no internal calculation occurs on m or c updates).
There is one Offset DAC per all four channels in the device, it is addressed through any PMU0-3 address. The Offset DAC only has an
input register associated with it; there are no m or c registers for this DAC. When writing to this DAC, set both Mode bits high to address
the DAC input register (x1).
This address table is also used for readback of a particular DAC address.
Table 21. DAC Register Addressing
Address bits A5 to A3 (DAC ADDRESS Register)
Register Set
000
001
A2 to A0
(REGISTER
ADDRESS)
MODE1
0
1
MODE0
1
0
RESERVED
RESERVED
000 ±5µA I range
1
1
OFFSET DAC FIN
001 ±20µA I range RESERVED
FIN
010 ±200µA I range RESERVED
FIN
011 ±2mA I range
RESERVED
FIN
100 ±external I range RESERVED
FIN
101 Voltage range RESERVED
FIN
110 RESERVED
RESERVED
RESERVED
111 RESERVED
RESERVED
RESERVED
010
RESERVED
RESERVED
RESERVED
RESERVED
CLL I¹
CLL V²
RESERVED
RESERVED
011
RESERVED
RESERVED
RESERVED
RESERVED
CLH I¹
CLH V²
RESERVED
RESERVED
100
CPL
CPL
CPL
CPL
CPL
CPL
RESERVED
RESERVED
101
CPH
CPH
CPH
CPH
CPH
CPH
RESERVED
RESERVED
110
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
111
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
1 _{CLL I = Clamp Level Low Current register. CLH I = Clamp Level High Current Register. When forcing a voltage, current clamps are engaged, so this register set will be}
loaded to the Clamp DAC.
2 _{CLL V = Clamp Level Low Voltage register. CLH V = Clamp Level High Voltage Register. When forcing a current, voltage clamps are engaged, so this register set will be}
loaded to the Clamp DAC.
Rev. PrM | Page 36 of 48