EVAL1203/BA View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'EVAL1203/BA' PDF : 21 Pages View PDF
TSA1203
Figure 11 : Analog to Digital Converter characterization bench
HP8644
Sine Wave
Generator
Data
Vin
ADC
evaluation
Logic
Analyzer
PC
board
Clk
Clk
HP8133
Pulse
Generator
Sine Wave
HP8644 Generator
Operating conditions of the evaluation board:
Find below the connections to the board for the
power supplies and other pins:
board
notation
AV
AG
RPI
RMI
CMI
RPQ
RMQ
CMQ
DV
DG
GB1
VB1
GB2
VB2
GB3
VB3
connection
AVCC
AGND
REFPI
REFMI
INCMI
REFPQ
REFMQ
INCMQ
DVCC
DGND
GNDBI
VCCBI
GNDBE
VCCBE
GNDB3
VCCB3
internal
voltage (V)
0.89
0.46
0.89
0.46
external
voltage (V)
2.5
0
<1.8
<0.5
<1.1
<1.8
<0.5
<1.1
2.5
0
0
2.5
0
2.5/3.3
0
2.5
17/21
Care should be taken for the evaluation board
considering the fact that the outputs of the con-
verter are 2.5V/3.3V (VCCB2) tolerant whereas
the 74LCX573 external buffers are operating up to
2.5V.
Single and Differential Inputs:
The ADC board components are mounted to test
the TSA1203 with single analog input; the
ADT1-1WT transformer enables the differential
drive into the converter; in this configuration, the
resistors RSI6, RSI7, RSI8 for I channel (respec-
tively RSQ6, RSQ7, RSQ8 for Q one) are con-
nected as short circuits whereas RSI5, RSI9 (re-
spectively RSQ5, RSQ9) are open circuits.
The other way is to test it via JI1 and JI1B differen-
tial inputs. So, the resistances RSI5, RSI9 for I
channel (respectively RSQ5, RSQ9 for Q one) are
connected as short circuits whereas RSI6, RSI7,
RSI8 (respectively RSQ6, RSQ7, RSQ8 for Q
one) are open circuits.
Grounding consideration
So as to better reject noise on the board, connect
on the bottom overlay AG (AGND), DG(DGND),
GB1(GNDBI) together from one part, and
GB2(GNDBE) with GB3(GNDB3) from the other
part.
Mode select
So as to evaluate a single channel or the dual
ones, you have to connect on the board the
relevant position for the SELECT pin (see figure
12)
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