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参数资料
| 型号： | TSA1401IFT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | ADC |
| 英文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封装： | 7 X 7 MM, TQFP-48 |
| 文件页数： | 5/19页 |
| 文件大小： | 641K |
| 代理商： | TSA1401IFT |
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APPLICATION INFORMATION
TSA1401
13/19
Fig. 11: Distortion vs. VREFP
Fin=5MHz;Fs=20Mhz;Icca=26mA;INCM=0.46V
An external reference voltage device may be used
for specific applications requiring even better
linearity, accuracy or enhanced temperature
behavior.
Using the STMicroelectronics TS821, TS4041-1.2
or TS431 Voltage Reference devices leads to
optimum
performances
when
configured
as
shown in
Figure 12. The full scale is increased to
2.5Vpp differential and SNR and SINAD are
enhanced as shown in
Figure 13 .
Fig. 12: External reference setting
In multi-channel applications, the high impedance
input of the references permits to drive several
ADCs with only one Voltage Reference device.
Fig. 13: Linearity vs. Fs at Fin=5MHz, using
TS4041 Icca optimised; VREFP=1.225V;
VREFM=GND; INCM=0.65V,
Fig. 14: Distortion vs. Fs at Fin=5MHz, using
TS4041 Icca optimised; VREFP=1.225V;
VREFM=GND; INCM=0.65V
The magnitude of the analog input common
mode, CM should stay close to VREFP/2. Higher
level will introduce more distortion.
5.1.2 - Driving the analog input
The
TSA1401
has
been
designed
to
be
differentially driven for better noise immunity.
Some measurements have been done with
single-ended signals. It degrades a little bit the
performances, with an SFDR of -75dBc and an
ENOB of 11.2 bits at 20Msps, Fin at 10MHz.
The switch-capacitor input structure of TSA1401,
presents a high input impedance (3.3k
at
Fs=20MHz)
but
not
constant
in
time
(see
equivalent input circuit
Figure 15). Indeed at the
end of each conversion, the charge update of the
-100
-95
-90
-85
-80
-75
-70
0.8
0.9
1
1.1
1.2
1.3
1.4
REFP (V)
Di
storti
on
(dBc
)
THD
SFDR
1k
TSA1401
VIN
VINB
VREFM
VREFP
external
reference
AVCC
330pF
4.7F
10nF
TS821
TS4041
REFMODE
100
65
68
71
74
77
80
3579
11
13
15
17
19
21
Fs (Mhz)
D
y
na
m
ic
pa
ra
m
e
te
rs
(
d
B
)
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
12
12.1
E
N
OB
(
B
it
s
)
ENOB
SINAD
SNR
-100
-95
-90
-85
-80
-75
-70
3579
11
13
15
17
19
21
Fs (Mhz)
D
istort
ion
(dB
c
)
THD
SFDR
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