HI7133CPL Просмотр технического описания (PDF) - Intersil
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HI7133CPL Datasheet PDF : 21 Pages
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HI7131, HI7133
CREF+ REFHI
34
36
CREF
REFLO CREF-
35
33
INHI
31
INT
AZ AND AZ AND
ZI
ZI
INPUT HIGH
DE-
DE+
-
+
ZI
AZ
RINT
CAZ
CINT
BUFF
A-Z
INT
V+
28 29 INTEGRATOR 27
1
-
-
+
+
AZ COMPARATOR
ZERO
CROSSING
DETECTOR
POLARITY
FLIP-FLOP
V+
32
COMMON
30
INLO
DE+
DE-
VCOMMON
GENERATOR
V-
26
V-
FIGURE 93A. HI7131 AND HI7133 ANALOG SECTION FUNCTIONAL DIAGRAM
TO
DIGITAL
SECTION
CREF
CREF+ REFHI
34
36
REFLO CREF-
35
33
AZ AND AZ AND
ZI
ZI
-
+
31
INHI
INPUT HIGH
INT
DE-
DE+
ZI
AZ
RINT
CAZ
CINT
BUFF
A-Z
INT
V+
28 29 INTEGRATOR 27
1
-
-
+
ZERO
+
CROSSING
DETECTOR
AZ COMPARATOR
POLARITY
FLIP-FLOP
V+
32
COMMON
30
INLO
DE+
DE-
AZ AND DE ± AND ZI
VCOMMON
GENERATOR
V-
26
V-
FIGURE 93B. ICL7136 AND ICL7137 ANALOG SECTION FUNCTIONAL DIAGRAM
FIGURE 93. HI7131, HI7133 vs ICL7136, ICL7137 ANALOG SECTIONS
TO
DIGITAL
SECTION
HI7131/33 vs ICL7136/37
Figure 5 shows the analog front end block diagram of both
HI7131/33 and ICL7136/37. The difference is the common
reference voltage generator connection and 2 extra analog
switches in the ICL7136. The HI7131 architecture uses the
INLO as the reference point of the integrator (non-inverting
input of the integrator amplifier) in all the phases of the con-
version cycle. The ICL7136 uses INLO as a reference point
only during integration cycle and COMMON pin is used as
the integrator reference point during auto-zero, deintegrate,
and zero integrate phases.
The circuit configuration of the HI7131 results in a superior
120dB rejection of DC common mode on the inputs. How-
ever, the HI7131 has reduced AC common mode noise
rejection, since the noise on the INLO input can cause errors
during the deintegration phase.
The circuit configuration of the ICL7136 is unaffected by the
AC noise riding on the inputs, but the DC common mode
rejection on the input is only 86dB.
3-1835
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