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PDF HI7131 Data sheet ( Hoja de datos )
| Número de pieza | HI7131 | |
| Descripción | (HI7131 / HI7133) LCD/LED Display-Type A/D Converters | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HI7131 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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HI7131, HI7133NoveHmc1Iob7-Pe81nOr83ta281S0c-SsI0tN0IeOoBTeuBLEIrESCRTOLSSe7LIcUL1EhBxoTn6SrEi,cTwaPITHwlRUSIw7OTu1.DiEp3nUp3tPeoCsRrrTestOeiClD.cIeCUonLCmte7T/r1tsxac7t
31/2 Digit, Low Power, High CMRR,
LCD/LED Display-Type A/D Converters
Features
• 120dB CMRR Equal to ±0.01 Count/V of Common
Mode Voltage Error
• Fast Recovery from Input Overrange Results “Correct
First-Reading” After Overload
• Guaranteed 0000 Reading for 0V Input
• True Polarity at Zero for Precise Null Detection
• 1pA Input Current (Typ)
• True Differential Input and Reference
• Single or Dual Supply Operation Capability
• Direct LCD Display Drive - HI7131
• Direct LED Display Drive - HI7133
• Low Noise, 15µVP-P Without Hysteresis or Overrange
Hangover
• Low Power Dissipation, Guaranteed Less Than 1mW,
Results 8000 Hours (Typ) 9V Battery Life
• No Additional Active Components Required
Description
The Intersil HI7131 and HI7133 are 31/2 digit, A/D convert-
ers that have been optimized for superior DC Common
Mode Rejection (CMRR) when used with a split ±5V supply
or a single 9V battery. The HI7131 contains all the neces-
sary active components on a single IC to directly interface an
LCD (Liquid Crystal Display). The supply current is under
100µA and is ideally suited for battery operation. The HI7133
contains all the necessary active components on a single IC
to directly interface an LED (Light Emitting Diode).
The HI7131 and HI7133 feature high accuracy performance
like,
fast
120dB of CMRR, auto-zero to
recovery from over load, zero
less than 10µV
drift of less than
of offset,
1µV/oC,
input bias current of 10pA maximum, and rollover error of
less than one count. A true differential signal and reference
inputs are useful features in all systems, but gives the
designer an advantage when measuring load cells, strain
gauges and other bridge-type transducers.
The HI7131 and HI7133 are supplied in a 40 lead plastic DIP
and a 44 lead metric plastic quad flatpack package.
Ordering Information
Applications
• Handheld Instruments
• Basic Measurements: Voltage, Current, Resistance
Pressure, Temperature, Fluid Flow and Level, pH,
Weight, Light Intensity
• DMMs and DPMs
PART NO.
HI7131CPL
HI7131CM44
HI7133CPL
HI7133CM44
TEMP.
RANGE (oC)
PACKAGE
0 to 70 40 Ld PDIP
0 to 70 44 Ld MQFP
0 to 70 40 Ld PDIP
0 to 70 44 Ld MQFP
PKG. NO.
E40.6
Q44.10x10
E40.6
Q44.10x10
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
1
File Number 3373.3
1 page  
HI7131, HI7133
Electrical Specifications (Notes 5, 6, 7) TA = 25oC. Device is Tested in the Circuit Shown in Figure 2.
Full Scale Range (FSR) = 200.0mV, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
Ratiometric Reading
Rollover Error
Linearity Error
VIN HI = VREF HI, VIN LO = VREF LO = VCOMMON
VREF HI - VREF LO = 100mV
VIN = ±199mV
FSR = 200mV or 2V (Notes 5, 8)
999
-
-
999/
1000
±0.2
±0.2
1001
±1
±1
Zero Input Reading Drift
VIN = 0V
Over Full Temperature Range
(Notes 5, 8)
- ±0.2 ±1
±0.01
Scale Factor Temperature Coefficient VIN = 199mV, Over Full Temperature Range,
Reference Drift Not Included (Notes 5, 8)
- ±1 ±5
±0.01
Equivalent Input Noise (Peak-To-Peak VIN = 0V (Notes 5, 8)
Value Not Exceeded 95% of the Time)
- 15 -
0.15
INPUT
Common Mode Voltage Sensitivity
VCM = ±1V, VIN = 0V (Notes 5, 6, 8, 9)
- -1
0.01
Input Leakage Current
Overload Recovery Period
VIN = 0V (Notes 5, 8)
VIN Changing from ±10V to 0V
(Notes 5, 8)
- 1 10
- -1
COMMON PIN
COMMON Pin Voltage (With Respect
to V+, i.e., V+ - VCOMMON)
COMMON Pin Voltage Temperature
Coefficient
V+ to V- = 10V
V+ to V- = 10V (Notes 5, 8)
2.4 2.8 3.2
- 150 -
COMMON Pin Sink Current
COMMON Pin Source Current
DISPLAY DRIVER (HI7131)
+0.1V Change on VCOMMON (Note 5)
-0.1V Change on VCOMMON (Note 5)
-3-
-1-
Peak-To-Peak Segment Drive Voltage V+ to V- = 10V
456
Peak-To-Peak Backplane Drive Volt-
age
456
POWER SUPPLY (Nominal Supply Voltage; V+ to V- = 10V)
Supply Current (Does Not Include
COMMON Pin Current)
VIN = 0V (Note 10)
Oscillator Frequency = 16kHz
- 70 100
Power Dissipation Capacitance
VS Clock Frequency (Notes 5, 8)
- 40 -
DISPLAY DRIVER (HI7133)
Segment Sink Current
(Except Pins 19 and 20)
V+ = +5.0V
Driver Pin Voltage = 3.0V
5 8.5 -
Pin 19 Sink Current
10 16
-
Pin 20 Sink Current
47 -
POWER SUPPLY Nominal Supply Voltage; V+ = +5V, V- = -5V, Both Respect to GND Pin
UNITS
Reading
Count
Count
µV/oC
Count/oC
ppm/oC
Count/oC
µV
Count
µV/V
Count/V
pA
Conversion
Cycle
V
ppm/oC
mA
µA
V
V
µA
pF
mA
mA
mA
5
5 Page 
HI7131, HI7133
CREF
CREF+
34
REFHI
36
REFLO CREF-
35 33
AZ AND AZ AND
ZI ZI
+-
INHI
31
INT
INPUT HIGH
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.
Analog Section Description
Figure 5A shows a simplified diagram of the analog section
of the HI7131 and HI7133. The circuit performs basic
phases of dual slope integration. Furthermore, the device
incorporates 2 additional phases called “Auto-Zero” and
“Zero Integrate”. The device accepts differential input signals
and reference voltages. Also, there is a reference voltage
generator which sets the COMMON pin 2.8V below the V+
supply. A complete conversion cycle is divided into the
following four phases:
1. Auto-Zero (A/Z)
2. Signal Integrate (INT)
3. Deintegrate or Reference Integrate (DE±)
4. Zero Integrate (ZI)
Digitally controlled analog switches direct the appropriate
signals for each phase of the conversion.
Auto-Zero Phase
During auto-zero three things occur. First, IN HI is discon-
nected from the device internal circuitry and internally
shorted to IN LO. Second, the reference capacitor is
charged to the reference voltage. Third, a feedback loop is
closed around the system to charge the auto-zero capacitor
CAZ and integrating capacitor CINT to compensate for offset
voltages in the buffer amplifier, integrator, and comparator.
Since the comparator is included in the loop, the A/Z accu-
racy is limited only by the noise of the system. In any case,
the offset referred to the input is less than 10µV.
Signal Integrate Phase
During signal integrate the auto-zero loop is opened and the
11
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet HI7131.PDF ] | |
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