AD5520JST Analog Devices Inc, AD5520JST Datasheet - Page 14

• Manufacturer Part Number: AD5520JST
• Description: IC SNGL PARAMETRIC MEASURE64LQFP
• Manufacturer: Analog Devices Inc
• Type: Per-pin Parametric Measurement Unit (PPMU)r

Specifications of AD5520JST

• Rohs Status: RoHS non-compliant
• Applications: Automatic Test Equipment
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• For Use With: EVAL-AD5520EBZ - BOARD EVAL FOR AD5520
• Lead Free Status / RoHS Status: Not Compliant

AD5520
INTERFACE
The AD5520 PPMU is controlled via a number of digital inputs,
which are discussed in detail in the following sections. All
inputs are TTL-compatible. CS is used to select the device while
STB (active low input) latches data available on the other digital
inputs and updates any required digital outputs. The rising edge
of STB triggers sequence inputs. The remaining digital inputs
control the function of the PMU. They also determine which
measure mode the PMU is in, the compensation capacitor used,
and the selected current range.
STANDBY MODE
The AD5520 can be placed into standby mode via the standby
logic input. In this mode, the force amplifier is disconnected
from the force input (FIN). In addition, the switch in series with
the force output pins (FOHx) is opened, and the current
measure amplifier is disconnected from the sense resistors. The
voltage measure amplifier is still connected across the DUT;
therefore, DUT voltage measurements may still be made while
in standby mode. Figure 21 shows the configuration of the
PMU while in standby mode.
Table 5. Standby Mode
Standby
Low
High
FORCE VOLTAGE OR FORCE CURRENT
FSEL is an input that determines whether the PPMU forces a
voltage or current.
Table 6. FSEL Function
FSEL
Low
High
MEASVOUT
MEASIOUT
DAC
Function
Voltage Force and Current Clamp with MEASIOUT Voltage
Current Force and Voltage Clamp with MEASVOUT Voltage
FIN
Figure 21. PMU in Standby Mode
Function
Normal Force Mode
Standby Mode
G = 16
G = 1
MEASIHx
MEASVH
MEASIL
MEASVL
FOHx
R
DUT
S
Rev. B | Page 14 of 24
MEASURED PARAMETER
MEASOUT is a muxed output that tracks the sensed parameter.
MSEL (digital input) connects the MEASOUT to the output of
the current sense amplifier or the voltage sense amplifier,
depending on which is the measured parameter of interest.
The MEASOUT pin is connected back to an ADC to allow the
measured value to be converted to a digital code.
Table 7. MEASOUT Connected to Voltage or Current
MSEL
Low
High
The MEASOUT pin can also be made high impedance through
the MOEB logic input.
Table 8. MOEB Allows MEASOUT to Go High Impedance
MOEB
Low
High
CURRENT RANGES
A number of current ranges are possible with the AD5520. The
AM0, AM1, and AM2 pins are digital inputs used to establish
full-scale current range of the PMU.
Table 9. Selection of Current Range
AM0
Low
High
Low
High
Low
High
Low
High
R
The AD5520 is designed to ensure the voltage drop across each
of the R
is flowing through them. To support other current ranges, these
sense resistor values can be changed. The force amplifier can
drive a maximum of 6 mA. It is not recommended to increase
the maximum current above the nominal range.
The two external current ranges use an external buffer to drive
higher current. The example in Figure 26 uses 40 mA and
160 mA ranges. These ranges can be changed to suit user
requirements for a high current range.
S
SELECTION
S
AM1
Low
Low
High
High
Low
Low
High
High
resistors is less than ±500 mV when maximum current
Function
MEASOUT = DUT Voltage
MEASOUT = DUT Current
AM2
Low
Low
Low
Low
High
High
High
High
Function
Enable MEASOUT Output
Hi-Z MEASOUT Output
Function
Current Range MODE0 (4 μA)
Current Range MODE1 (40 μA)
Current Range MODE2 (400 μA)
Current Range MODE3 (4 mA)
Current Range MODE4
(External Buffer Mode)
Current Range MODE5
(External Buffer Mode)
Standby (Same as STANDBY = High)
Standby (Same as STANDBY = High)