afs600 Actel Corporation, afs600 Datasheet - Page 10

• Manufacturer Part Number: afs600
• Description: Actel Fusion Programmable System Chips Mixed-signal Family With Optional Arm Support
• Manufacturer: Actel Corporation

supports 8-, 10-, and 12-bit modes of operation with a
cumulative sample rate up to 600 k samples per second
(ksps), differential nonlinearity (DNL) < 1.0 LSB, and Total
Unadjusted Error (TUE) of 0.72 LSB in 10-bit mode. The
TUE is used for characterization of the conversion error
and includes errors from all sources, such as offset and
linearity. Internal bandgap circuitry offers 1% voltage
reference accuracy with the flexibility of utilizing an
external reference voltage. The ADC channel sampling
sequence and sampling rate are programmable and
implemented in the FPGA logic using Designer and
Libero IDE software tool support.
Two channels of the 32-channel ADCMUX are dedicated.
Channel 0 is connected internally to V
to monitor core power supply. Channel 31 is connected
to an internal temperature diode which can be used to
monitor device temperature. The 30 remaining channels
can be connected to external analog signals. The exact
number of I/Os available for external connection signals
is device-dependent (refer to
details).
1 -4
Actel Fusion Programmable System Chips
Table 1 on page i
CC
and can be used
A d v a n c e d v 1 .4
for
With Fusion, Actel also introduces the Analog Quad I/O
structure
three analog inputs and one gate driver. Each quad can
be configured in various built-in circuit combinations,
such as three prescaler circuits, three digital input
circuits, a current monitor circuit, or a temperature
monitor circuit. Each prescaler has multiple scaling
factors programmed by FPGA signals to support a large
range of analog inputs with positive or negative polarity.
When the current monitor circuit is selected, two
adjacent analog inputs measure the voltage drop across
a small external sense resistor. Built-in operational
amplifiers amplify small voltage signals (2 mV sensitivity)
for accurate current measurement. One analog input in
each quad can be connected to an external temperature
monitor diode and achieves detection accuracy of ±3ºC.
In addition to the external temperature monitor
diode(s), a Fusion device can monitor an internal
temperature diode using dedicated channel 31 of the
ADCMUX.
Figure 1-1 on page 1-5
Analog Quad I/O structure. The Analog Quad shown is
configured to monitor and control an external power
supply. The AV pad measures the source of the power
supply. The AC pad measures the voltage drop across an
external sense resistor to calculate current. The AG
MOSFET gate driver pad turns the external MOSFET on
and off. The AT pad measures the load-side voltage level.
(Figure 1-1 on page
illustrates a typical use of the
1-5). Each quad consists of