參數(shù)資料
型號： VMX1C1020
廠商： Electronic Theatre Controls, Inc.
英文描述： Versa Mix 8051 Mixed-Signal MCU
中文描述： 反之亦然混合8051混合信號微控制器
文件頁數(shù)： 58/80頁
文件大小： 3605K
代理商： VMX1C1020
VMX51C1020
_________________________________________________________________________________________________
www.ramtron.com
page 58 of 80
Use of the internal reference requires the
addition of two external tank capacitors on the
XTVREF pin.
These capacitors consist of one 4.7uF to 10uF
Tantalum capacitor in parallel with one 0.1uF
Ceramic capacitor.
The following shows the connection of the tank
capacitors to the XTVREF pin
F
IGURE
36:
T
ANK CAPACITORS CONNECTION TO THE
XTVREF
PIN
XTVREF
4.7uF
to
10uF
0.1uF
2.7V
The VMX51C1020 internal reference can also
be used as an external reference provided that
the load on the XTVREF pin is kept to a
minimum. The following table shows the typical
effect of loading on the XTVREF voltage.
F
IGURE
37:
T
ANK CAPACITORS CONNECTION TO THE
XTVREF
PIN
X
Load current on XTVREF (mA)
2.65
2.70
2.75
0.0
1.0
2.0
3.0
4.0
5.0
It is recommended that the external load on the
XTVREF pin be less than 1mA.
Note:
A stabilization delay of more than 1ms
should be provided between the activation of the
bandgap, the PGA and the first A/D conversion
or measurement made on the programmable
current source.
Using an External Reference
An external reference can be used to drive the
VMX51C1020 ADC and the programmable
current source instead of the internal reference.
The external reference voltage source can be
set from 0.5 to 3.5 volts and must provide
sufficient drive to operate the ADC load.
F
IGURE
38:
E
XTERNAL REFERENCE CONNECTION TO THE
XTVREF
PIN
XTVREF
4.7uF
to
10uF
0.1uF
V
Warning:
When an external reference source is
applied to the XTVREF pin, it is
mandatory not to power-on the PGA.
The internal bandgap reference should
also be kept de-activated.
Reference Impact on the
Programmable Current Source
The Programmable Current Source uses the
same reference as the ADC for its operation,
therefore, using an external reference will have
a direct impact on the current source output.
The 200/800mV current source reference
voltage, calibrated at 2.7V will change in a linear
fashion according to the voltage present on the
XTVREF pin.
For example, in the case where the reference
voltage applied to the XTVREF pin is 3V, the
current source reference voltage will be scaled
up by a factor of [VXTVREF/2.7V] to 222mV and
889mV respectively.
A/D Converter
The VMX51C1020 includes a feature rich, highly
configurable on-chip 12-bit A/D converter.
The A/D conversion data is output as unsigned
12-bit binary, with 1 LSB = Full Scale/4096. The
following figure describes the ideal transfer
function for the ADC.
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