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參數(shù)資料
| 型號： | TSA1204IFT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | ADC |
| 英文描述： | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 498K |
| 代理商： | TSA1204IFT |
TSA1204
13/21
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’ OPERATING
CONDITIONS’ page 4 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). Using
internal VREFP, the dynamic range is 1.8V.
The best linearity and distortion performances are
achieved with a dynamic range above 2Vpp and
by 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
TS821or
TS4041-1.2 Vref leads to optimum performances
when configured as shown on Figure 2.
Figure 2 : External reference setting
DRIVING THE DIFFERENTIAL ANALOG
INPUTS
The TSA1204 has been designed to obtain
optimum performances when being differentially
driven. An RF transformer is a good way to
achieve such performances.
Figure 3 describes the schematics. The input
signal is fed to the primary of the transformer,
while the secondary drives both ADC inputs. The
common mode voltage of the ADC (INCM) is
connected to the center-tap of the secondary of
the transformer in order to bias the input signal
around this common voltage, internally set to
0.46V. It determines the DC component of the
analog signal. As being an high impedance input,
it acts as an I/O and can be externally driven to
adjust
this
DC
component.
The
INCM
is
decoupled to maintain a low noise level on this
node. Our evaluation board is mounted with a 1:1
ADT1-1WT transformer from Minicircuits. You
might also use a higher impedance ratio (1:2 or
1:4) to reduce the driving requirement on the
analog signal source.
Each analog input can drive a 1.4Vpp amplitude
input signal, so the resultant differential amplitude
is 2.8Vpp.
Figure 3 : Differential input configuration with
transformer
Figure 4 represents the biasing of a differential
input signal in
AC-coupled differential input
configuration. Both inputs VIN and VINB are
centered around the common mode voltage, that
can be let internal or fixed externally.
Figure 4 : AC-coupled differential input
Figure 5 shows a DC-coupled configuration with
forced VREFP and INCM to the 1V DC analog
input while VREFM is connected to ground; we
achieve a 2Vpp differential amplitude.
1k
TSA1204
VIN
VINB
VREFM
VREFP
external
reference
VCCA
330pF
4.7uF
10nF
TS821
TS4041
TSA1204
VIN
VINB
INCM
50
33pF
330pF
470nF
10nF
Analog source
1:1
ADT1-1
I or Q ch.
50
10nF
TSA1204
VIN
VINB
INCM
33pF
100k
100k
50
10nF
common
mode
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