EVAL1002/AA View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'EVAL1002/AA' PDF : 19 Pages View PDF
TSA1002
Figure 6 : Input dynamic range for the various configurations
Differential configuration
+FS: code 1023
VIN - VINB
VINB
INCM
VIN
0: code 511
Single-ended configuration:
balanced inputs
N Single-ended configuration:
unbalanced inputs
+FS: code 1023
VIN - VINB
VIN
I G+FS + offset: code > 1023
VIN - VINB
VIN
0: code 511
VINB
S
INCM
EINCM
D
-FS: code 0
-FS + offset: code > 0
W Ao + ac VIN
Ao + ac VIN
-FS: code 0
Ao + ac VIN
N E ct(s) Ao+ac
VINB
INCM
Ao
VINB
INCM
Ao
VINB
INCM
Ao
Wrong configuration!
du The applications requiring single-ended inputs
R ro can be configured like reported on Figure 7 for an
P AC-coupled input or on Figure 8 and 9 for a
O te DC-coupled input.
le In the case of AC-coupled analog input, the
F o analog inputs Vin and Vinb are biased to the same
s voltage that is the common mode voltage of the
b circuit (INCM). The INCM and reference voltages
T O may remain at their internal level but can also be
- fixed externally.
Figure 8 : DC-coupled 2Vpp analog input
Analog
DC
AC+DC
VREFP
VIN
TSA1002
VINB
VREFM
INCM
VREFP-VREFM = 1 V
330pF 10nF 4.7uF
O t(s) Figure 7 : AC-coupled Single-ended input
Figure 9 : DC-coupled 1Vpp analog input
N uc Signal source
d 10nF
ro 50Ω 33pF
100kΩ
P common
te mode
100kΩ
VIN
INCM TSA1002
VINB
Analog
DC
AC+DC
VIN
TSA1002
VINB VREFM
INCM
bsole In the case of DC-coupled analog input with 1V
ODC signal, the DC component of the analog input
0.5V power supply
330pF 10nF 4.7uF
set the common mode voltage. As an example fig-
VREFP-VREFM = 0.5 V
ure 8, INCM is set to the 1V DC analog input while
VREFM is connected to ground and VREFP let in-
ternal; we achieve a 2Vpp differential amplitude.
Dynamic characteristics, while not being as
remarkable as for differential configuration, are
Figure 9 describes a configuration for a 1Vpp still of very good quality. Measurements done at
analog signal with a 0.5V DC input. In this case, 50Msps, 2MHz input frequency, -1dBFS input
while VREFP is kept internally at 1V, VREFM is
connected to VINB and INCM externally to 0.5V;
level sum up these performances. An SFDR of
-64.5dBc, a SNR of 57.8dB and an ENOB Full
the dynamic is then 1Vpp (VREFP-VREFM=0.5V). Scale of 9.3bits are achieved.
15/20
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