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Data Sheet AD7294-2
Rev. 0 | Page 21 of 44
When this limit is reached, the output is latched onto a dedicated
pin. This output remains high until the latch is cleared by writing
to the appropriate register.
Figure 39. High-Side Current Sense
The AD7294-2 current sense comprises two main blocks:
a differential and an instrumentation amplifier. A load current
flowing through the external shunt resistor produces a voltage
at the input terminals of the AD7294-2. Resistors R1 and R2
connect the input terminals to the differential amplifier (A1).
A1 nulls the voltage that appears across its own input terminals
by adjusting the current through R1 and R2 with Transistors Q1
and Q2. Common-mode feedback maintains the sum of these
currents at approximately 50 μA. When the input signal to the
AD7294-2 is zero, the currents in R1 and R2 are equal. When the
differential signal is nonzero, the current increases through one
of the resistors and decreases in the other. The current difference is
proportional to the size and polarity of the input signal.
The differential currents through Q1 and Q2 are converted into
a differential voltage by R3 and R4. A2 is configured as an instru-
mentation amplifier, buffering this voltage and providing additional
gain. Therefore, for an input voltage of ±200 mV at the pins, an
output span of ±2.5 V is generated.
The current sensors on the AD7294-2 are designed to remove
any flicker noise and offset that are present in the sensed signal.
This is achieved by using a chopping technique that is transparent
to the user. The VSENSE signal is first converted by the AD7294-2,
the analog inputs to the amplifiers are then swapped, and the
differential voltage is once again converted by the AD7294-2.
The two conversion results enable the digital removal of any
offset or noise. Switches on the amplifier inputs enable this
chopping technique to be implemented. The process typically
requires 6 μs, in total, to return a final result.
Choosing RSENSE
The resistor values used in conjunction with the current sense
amplifiers are determined by the specific application requirements
in terms of voltage, current, and power. Small resistors minimize
power dissipation, have low inductance to prevent any induced
voltage spikes, and provide good tolerance, which reduces current
variations. The final values chosen are a compromise between
low power dissipation and good accuracy. Low value resistors
have less power dissipated in them, but higher value resistors may
be required to use the full input range of the ADC, thus achieving
maximum SNR performance.
When the sense current is known, the voltage range of the
AD7294-2 current sensor (200 mV) is divided by the maximum
sense current to yield a suitable shunt value. If the power dissi-
pation in the shunt resistor is too large, the size of the shunt
resistor can be reduced; in this case, less of the ADC input range
is used. Using less of the ADC input range produces conversion
results that are more susceptible to noise and offset errors because
offset errors are fixed and are, thus, more significant when
smaller input ranges are used.
RSENSE must be able to dissipate the I2R losses. If the power dis-
sipation rating of the resistor is exceeded, its value may drift or
the resistor may be damaged, resulting in an open circuit. This
open circuit can cause a differential voltage across the terminals
of the AD7294-2 in excess of the absolute maximum ratings.
Additional protection is afforded to the current sensors on the
AD7294-2 by the recommended current limiting resistors,
RF1 and RF2, as shown in Figure 40. The AD7294-2 can handle
a maximum continuous current of 30 mA; thus, an RF2 of 1 kΩ
provides adequate protection for the AD7294-2.
If ISENSE has a large high frequency component, take care to choose
a resistor with low inductance. Low inductance metal film resistors
are best suited for these applications.
Current Sense Filtering
In some applications, it may be desirable to use external filtering to
reduce the input bandwidth of the amplifier (see Figure 40).
The −3 dB differential bandwidth of this filter is equal to
BWDM = 1/(4 × π × RC)
Note that the maximum series resistance on the RS(+) and
RS(−) inputs (see Figure 39) is limited to a maximum of 1 kΩ
due to back-to-back ESD protection diodes from RS(+) and
RS(−) to VPPx. Also, note that if RF1 and RF2 are in series with
R1 and R2 (see Figure 39), the gain of the amplifier is affected. Any
mismatch between RF1 and RF2 can introduce an offset error.
Figure 40. Current Sense Filtering (RSx Can Be Either RS1 or RS2)
For certain RF applications, the optimum value for RF1 and RF2
is 1 kΩ, whereas CF can range from 1 μF to 10 μF. There is an
additional decoupling capacitor for the VPPx supply. Its value is
application dependent, but for initial evaluation, values in the
range of 1 nF to 100 nF are recommended.
AD7294-2
AV
DD
TO 59.4V
RSx(+)
R
SENSE
I
LOAD
RSx(–)
R1
40kΩ R2
40kΩ
R3
100kΩ R4
100kΩ
Q1 Q2
V
OUT
TO MUX
A1
A1
A2
V
PP
x
10936-029
10936-098
RF1 RF2
CF
AD7294-2
VPP RSENSE ILOAD
RSx(–)RSx(+)
10nF
VPPx