HI3-574ALN-5 INTERSIL [Intersil Corporation], HI3-574ALN-5 Datasheet - Page 10

• Manufacturer Part Number: HI3-574ALN-5
• Description: Complete, 12-Bit A/D Converters with Microprocessor Interface
• Manufacturer: INTERSIL [Intersil Corporation]

Pin Descriptions
PIN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
SYMBOL
REF OUT
10V Input
20V Input
BIP OFF
V
REF IN
DB10
DB11
LOGIC
12/8
V
V
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DB8
DB9
STS
R/C
CS
CE
AC
DC
A
CC
EE
O
20V Input - Used for 0V to 20V and -10V
Logic supply pin (+5V)
Data Mode Select - Selects between
12-bit and 8-bit output modes.
Chip Select - Chip Select high disables
the device.
Byte Address/Short Cycle - See Table
1 for operation.
Read/Convert - See Table 1 for
operation.
Chip Enable - Chip Enable low disables
the device.
Positive Supply (+12V/+15V)
+10V Reference
Analog Common
Reference Input
Negative Supply (-12V/-15V).
Bipolar Offset
10V Input - Used for 0V to 10V and -5V
to +5V input ranges.
to +10V input ranges.
Digital Common
Data Bit 0 (LSB)
Data Bit 1
Data Bit 2
Data Bit 3
Data Bit 4
Data Bit 5
Data Bit 6
Data Bit 7
Data Bit 8
Data Bit 9
Data Bit 10
Data Bit 11 (MSB)
Status Bit - Status high implies a
conversion is in progress.
DESCRIPTION
HI-574A, HI-674A, HI-774
6-961
Definitions of Specifications
Linearity Error
Linearity error refers to the deviation of each individual code
from a line drawn from “zero” through “full scale”. The point
used as “zero” occurs
the first code transition (all zeros to only the LSB “on”). “Full
scale” is defined as a level 1
sition (to all ones). The deviation of a code from the true straight
line is measured from the middle of each particular code.
The HI-X74(A)K and L grades are guaranteed for maximum
nonlinearity of
analog value which falls exactly in the center of a given code
width will result in the correct digital output code. Values nearer
the upper or lower transition of the code width may produce the
next upper or lower digital output code. The HI-X74(A)J is
guaranteed to 1 LSB max error. For this grade, an analog
value which falls within a given code width will result in either
the correct code for that region or either adjacent one.
Note that the linearity error is not user-adjustable.
Differential Linearity Error (No Missing Codes)
A specification which guarantees no missing codes requires
that every code combination appear in a monotonic increas-
ing sequence as the analog input level is increased. Thus
every code must have a finite width. For the HI-X74(A)K and L
grades, which guarantee no missing codes to 12-bit resolu-
tion, all 4096 codes must be present over the entire operating
temperature ranges. The HI-X74(A)J grade guarantees no
missing codes to 11-bit resolution over temperature; this
means that all code combinations of the upper 11 bits must be
present; in practice very few of the 12-bit codes are missing.
Unipolar Offset
The first transition should occur at a level
common. Unipolar offset is defined as the deviation of the
actual transition from that point. This offset can be adjusted as
discussed on the following pages. The unipolar offset tempera-
ture coefficient specifies the maximum change of the transition
point over temperature, with or without external adjustment.
Bipolar Offset
Similarly, in the bipolar mode, the major carry transition
(0111 1111 1111 to 1000 0000 0000) should occur for an
analog value
offset error and temperature coefficient specify the initial
deviation and maximum change in the error over tempera-
ture.
Full Scale Calibration Error
The last transition (from 1111 1111 1110 to 1111 1111
1111) should occur for an analog value 1
nominal full scale (9.9963V for 10.000V full scale). The full
scale calibration error is the deviation of the actual level at
the last transition from the ideal level. This error, which is
typically 0.05 to 0.1% of full scale, can be trimmed out as
shown in Figures 2 and 3. The full scale calibration error
over temperature is given with and without the initial error
trimmed out. The temperature coefficients for each grade
indicate the maximum change in the full scale gain from the
initial value using the internal 10V reference.
1
/
1
2
/
2
LSB below analog common. The bipolar
LSB. For these grades, this means that an
1
/
2
LSB (1.22mV for 10V span) before
1
/
2
LSB beyond the last code tran-
1
/
2
1
LSB above analog
/
2
LSB below the