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| 型號： | E737-EDGE737 |
| 英文描述： | Per-Pin Precision Measurement Unit |
| 中文描述： | 每針精密測量單元 |
| 文件頁數(shù)： | 20/21頁 |
| 文件大?。?/td> | 188K |
| 代理商： | E737-EDGE737 |
8
2000 Semtech Corp.
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge737
PRELIMINARY
Circuit Description (continued)
REXT Selection
The Edge737 is designed for the voltage drop across RA,
RB, RC, and RD to be
≤ 2V with the maximum current
passing through them.
However, these resistor values
can be changed to support different applications.
Increasing the maximum current beyond the nominal range
is not recommended. However, decreasing the maximum
current is allowed.
Short Circuit Protection
The Edge737 is designed to survive a direct short circuit
to any voltage within the supply rails at the FORCE and
SENSE pins.
Transient Clamps
The Edge737 has on-board clamps to limit the voltage
and current spikes that might result from either changing
the current range or changing the operating mode.
Common Mode Error/Calibration
In order to attain a high degree of accuracy in a typical
ATE application, offset and gain errors are accounted for
through software calibration. When forcing or measuring
a current with the Edge737, an additional source of error,
common mode error, should be accounted for. Common
mode error is a measure of how the common mode
voltage, VCM, at the input of the current sense amplifier
affects the forced or measured current values (see Figure
2). Since this error is created by internal resistors in the
current sense amplifier, it is very linear in nature.
Using the common mode error and common mode linearity
specifications, one can see that with a small number of
calibration steps (see Applications note PMU-A1), the
effect of this error can be significantly reduced.
Compensation Capacitors
COMP1 and COMP2 are internal op amp compensation
pins that require a 120 pF capacitor connected between
the two pins.
CAPI is an external noise compensation pin that can be
used as a low pass filter to eliminate noise from the IVIN
and VINP input pins through the connection of an external
capacitor from CAPI to GND. The relationship between
the roll-off frequency of noise filtered (in Hz) to the external
capacitance (in farads) can be seen below:
Filter Frequency =
CA and CB are internal compensation pins that require a
120 pF capacitor connected between them.
Power Supply Sequencing
In order to help protect the Edge737 from a latch-up
condition, it is important that VCC
≥ All Input Voltages ≥
VEE, and VCC
≥ GND ≥ VEE at all times.
1
80,000
π X CCAPI
Figure 2. Graphical Representation of
Common Mode Error
–5V
7V
VOS@IVMON
VCM@FORCE
CM Error = Slope
CM Linearity
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