AD5748ACPZ Analog Devices Inc, AD5748ACPZ Datasheet - Page 28

• Manufacturer Part Number: AD5748ACPZ
• Description: ZDPLC +/-24V DRIVER
• Manufacturer: Analog Devices Inc

Specifications of AD5748ACPZ

• Amplifier Type: Instrumentation
• Number Of Circuits: 1
• Slew Rate: 2 V/µs
• Current - Output / Channel: 15mA
• Voltage - Supply, Single/dual (±): ±12 V ~ 24 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: *
• No. Of Amplifiers: 3
• Supply Voltage Range: ± 12V To ± 24V
• Supply Current: 5.2mA
• Amplifier Case Style: LFCSP
• No. Of Pins: 32
• Operating Temperature Range: -40°C To +105°C
• Svhc: No
• Rohs Compliant: Yes
• Bandwidth: 100kHz
• Amplifier Output: Differential
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -
• -3db Bandwidth: -
• Current - Input Bias: -
• Voltage - Input Offset: -
• Current - Supply: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD5748
DETAILED DESCRIPTION OF FEATURES
OUTPUT FAULT ALERT—SOFTWARE MODE
In software mode, the AD5748 is equipped with one FAULT
pin; this is an open-drain output allowing several AD5748
devices to be connected together to one pull-up resistor for
global fault detection. In software mode, the FAULT pin is
forced active low by any one of the following fault scenarios:
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OUTPUT FAULT ALERT—HARDWARE MODE
In hardware mode, the AD5748 is equipped with three fault
pins: VFAULT, IFAULT, and TEMP. These are open-drain
outputs allowing several AD5748 devices to be connected
together to one pull-up resistor for global fault detection. In
hardware control mode, these fault pins are forced active by
any one of the following fault scenarios:
•
The voltage at IOUT attempts to rise above the compliance
range, due to an open-loop circuit or insufficient power
supply voltage. The internal circuitry that develops the
fault output avoids using a comparator with window limits
because this requires an actual output error before the fault
output becomes active. Instead, the signal is generated when
the internal amplifier in the output stage has less than
approximately 1 V of remaining drive capability. Thus,
the fault output activates slightly before the compliance
limit is reached. Because the comparison is made within
the feedback loop of the output amplifier, the output
accuracy is maintained by its open-loop gain, and an output
error does not occur before the fault output becomes active.
A short is detected on the voltage output pin (VOUT). The
short-circuit current is limited to 15 mA.
An interface error is detected due to a packet error
checking (PEC) failure. See the Packet Error Checking
section.
If the core temperature of the AD5748 exceeds
approximately 150°C.
Open-circuit detect. The voltage at IOUT attempts to rise
above the compliance range, due to an open-loop circuit
or insufficient power supply voltage. The internal circuitry
that develops the fault output avoids using a comparator
with window limits because this requires an actual output
error before the fault output becomes active. Instead, the
signal is generated when the internal amplifier in the
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VOLTAGE OUTPUT SHORT-CIRCUIT PROTECTION
Under normal operation, the voltage output sinks and sources
up to 12 mA and maintains the specified operation. The maxi-
mum current that the voltage output delivers is 15 mA; this is
the short-circuit current.
ASYNCHRONOUS CLEAR (CLEAR)
CLEAR is an active high clear that allows the voltage output
to be cleared to either zero-scale code or midscale code and is
user-selectable via the CLRSEL pin or the CLRSEL bit of the
input shift register, as described in Table 7. (The clear select
feature is a logical OR function of the CLRSEL pin and the
CLRSEL bit.) The current loop output clears to the bottom of
its programmed range. When the CLEAR signal is returned
low, the output returns to its programmed value or a new value
if programmed. A clear operation can also be performed via the
clear command in the control register.
Table 10. CLRSEL Options
CLRSEL
0
1
output stage has less than approximately 1 V of remaining
drive capability. Thus, the fault output activates slightly
before the compliance limit is reached. Because the compari-
son is made within the feedback loop of the output amplifier,
the output accuracy is maintained by its open-loop gain,
and an output error does not occur before the fault output
becomes active. If this fault is detected, the IFAULT pin is
forced low.
A short is detected on the voltage output pin (VOUT).
The short-circuit current is limited to 15 mA. If this fault
is detected, the VFAULT pin is forced low.
If the core temperature of the AD5748 exceeds approx-
imately 150°C. If this fault is detected, the TEMP pin is
forced low.
Unipolar Output
Voltage Range
0 V
Midscale
Output Clear Value
Unipolar Current Output Range
Zero scale; for example:
4 mA on the 4 mA to 21 mA range
0 mA on the 0 mA to 21 mA range
Midscale; for example:
12.5 mA on the 4 mA to 21 mA range
10.5 mA on the 0 mA to 21 mA range