LM12434CIWM NSC [National Semiconductor], LM12434CIWM Datasheet - Page 23

• Manufacturer Part Number: LM12434CIWM
• Description: Sign Data Acquisition System with Serial I/O and Self-Calibration
• Manufacturer: NSC [National Semiconductor]

PLCC
Pkg
5 0 Pin Descriptions
Pin Number
10
11
12
13
14
15
16
17
18
19
1
2
3
4
5
6
7
8
9
Pkg
SO
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
7
8
9
Pin Name
DGND
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
V
V
AGND
V
DGND
V
P5
P4
P3
REF
REF
A
D
a
a
a
b
Figures 3 and 4 ) In order to achieve 12-bit performance this pin should be by passed to AGND
Digital ground This is the device’s digital supply ground connection It should be connected
through a low resistance and low inductance ground return to the system power supply
These are the eight analog inputs to the multiplexer For each conversion to be performed the
active channels are selected according to the instruction RAM programming Any individual
channel can be selected for a single-ended conversion referenced to AGND or any pair of
channels whether adjacent or non adjacent can be selected as a fully differential input pairs
Positive reference input The operating voltage range for this input is 1V
at least with a parallel combination of a 10 F and a 0 1 F (ceramic) capacitor The capacitors
should be placed as close to the part as possible
Negative reference input The operating voltage range for this input is 0 V
b
to AGND at least with a parallel combination of a 10 F and a 0 1 F (ceramic) capacitor The
capacitors should be placed as close to the part as possible
Analog ground This is the device’s analog supply ground connection It should be connected
through a low resistance and low inductance ground return to the system power supply
Analog supply This is the supply connection for the analog circuitry The device operating supply
voltage range is
connected to the same potential In order to achieve 12-bit performance this pin should be
bypassed to AGND at least with a parallel combination of a 10 F and a 0 1 F (ceramic)
capacitor The capacitors should be placed as close to the part as possible
Digital ground See above definition
Digital supply This is the supply connection for the analog circuitry The device operating supply
voltage range is
are connected to the same potential In order to achieve 12-bit performance this pin should be
by passed to DGND at least with a parallel combination of a 10 F and a 0 1 F (ceramic)
capacitor The capacitors should be placed as close to the part as possible
P1–P5 are the multi-function serial interface input or output pins that have different assignments
depending on the selected mode
Serial interface input
Serial interface input output Standard
Serial interface input
1V (See Figures 3 and 4 ) In order to achieve 12-bit performance this pin should be bypassed
TABLE I LM12 L 438 Pin Description
a
a
3 0V to
3 0V to
a
a
5 5V Accuracy is guaranteed only if the V
5 5V The device accuracy is guaranteed only if the V
Standard
8051
I
TMS320
8051
I
TMS320
Standard
8051
I
TMS320
23
2
2
2
C
C
C
Description
SCLK
TXD
SCL
DR
DO
RXD
SDA
DR
DI
CS
SAD2
DX
A
a
s
s
and V
V
REF
V
REF
a
D
b
a
A
s
a
s
are
V
and V
A
V
a
REF
(See
D
a
a