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參數(shù)資料
| 型號(hào)： | TSA0801IFT |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | ADC |
| 英文描述： | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, PLASTIC, TQFP-48 |
| 文件頁(yè)數(shù)： | 6/21頁(yè) |
| 文件大?。?/td> | 0K |
| 代理商： | TSA0801IFT |
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TSA0801
14/21
NO
T
FOR
NEW
DESI
G
N
Out of Range (OR)
This function is implemented on the output stage
in order to set up an "Out of Range" flag whenever
the digital data is over the full scale range.
Typically, there is a detection of all the data being
atí0í or all the data being atí1í. This ends up with
an output signal OR which is in low level state
(VOL) when the data stay within the range, or in
high level state (VOH) when the data are out of the
range.
Data Ready (DR)
The Data Ready output is an image of the clock
being synchronized on the output data (D0 to D9).
This is a very helpful signal that simplifies the syn-
chronization of the measurement equipment or
the controlling DSP.
As digital output, DR goes in high impedance state
when OEB is asserted to High level as described
in the timing diagram.
REFERENCES AND COMMON MODE
CONNECTION
VREFM must be always connected externally.
Internal reference and common mode
In the default configuration, the ADC operates with
its own reference and common mode voltages
generated by its internal bandgap. VREFM pin is
connected externally to the Analog Ground while
VREFP (respectively INCM) is set to its internal
voltage of 1.03V (respectively 0.57V). It is
recommended to decouple the VREFP in order to
minimize low and high frequency noise (refer to
Figure 1)
Figure 1 : Internal reference and common mode
setting
External reference and common mode
Each of the voltages VREFM, VREFP and INCM
can be fixed externally to better fit to the
application needs (Refer to table íOPERATING
CONDITIONSí page 2 for min/max values).
The VREFP, VREFM voltages set the analog
dynamic at the input of the converter that has a full
scale amplitude of 2*(VREFP-VREFM).
In case of analog dynamic lower than 2Vpp, the
best linearity
and
distortion
performance
is
achieved while increasing the VREFM voltage
instead of lowering the VREFP one.
The INCM is the mid voltage of the analog input
signal.
It is possible to use an external reference voltage
device for specific applications requiring even
better
linearity,
accuracy
or
enhanced
temperature behavior.
Using
the
STMicroelectronics
TS821
or
TS4041-1.2 Vref leads to optimum performances
when configured as shown on Figure 2.
Figure 2 : External reference setting
At 15Msps sampling frequency, 1MHz input
frequency
and
-1dBFS
amplitude
signal,
performances can be improved up to 2dBc on
SFDR and 0.3dB on SINAD. At 40Msps sampling
frequency, 1MHz input frequency and -1dBFS
amplitude signal, performances can be improved
up to 1dBc on SFDR and 0.6dB on SINAD.
This
can
be
very
helpful
for
example
for
multichannel application to keep a good matching
among the sampling frequency range.
TSA0801
VIN
VINB
VREFM
1.03V
VREFP
330pF
4.7uF
10nF
INCM
330pF
4.7uF
10nF
0.57V
1k
TSA0801
VIN
VINB
VREFM
VREFP
external
reference
VCCA
330pF
4.7uF
10nF
TS821
TS4041
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