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Intersil Electronic Components Datasheet



ICL7126

Single Chip A/D Converter


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ICL7126 pdf
®
Data Sheet
October 25, 2004
ICL7126
FN3084.5
3 1/2 Digit, Low Power, Single Chip A/D
Converter
The ICL7126 is a high performance, very low power
31/2-digit, A/D converter. All the necessary active devices
are contained on a single CMOS IC, including seven
segment decoders, display drivers, reference, and clock. The
ICL7126 is designed to interface with a liquid crystal display
(LCD) and includes a backplane drive. The supply current of
100µA is ideally suited for 9V battery operation.
The ICL7126 brings together an unprecedented combination
of high accuracy, versatility, and true economy. It features
auto-zero to less than 10µV, zero drift of less than 1µV/oC,
input bias current of 10pA maximum, and rollover error of
less than one count. The versatility of true differential input
and reference is useful in all systems, but gives the designer
an uncommon advantage when measuring load cells, strain
gauges and other bridge-type transducers. And finally the
true economy of single power operation allows a high
performance panel meter or multi-meter to be built with the
addition of only 10 passive components and a display.
The ICL7126 can be used as a plug-in replacement for the
ICL7106 in a wide variety of applications, changing only the
passive components.
Ordering Information
TEMP. RANGE
PART NUMBER
(°C)
PACKAGE
PKG.
DWG. #
ICL7126CPL
0 to 70
40 Ld PDIP
E40.6
ICL7126CPLZ
(Note 1)
0 to 70
40 Ld PDIP
E40.6
(Pb-free) (Note 2)
NOTES:
1. Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin
plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations.
Intersil Pb-free products are MSL classified at Pb-free peak
reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020C.
2. Pb-free PDIPs can be used for through hole wave solder
processing only. They are not intended for use in Reflow solder
processing applications.
Features
• 8,000 Hours Typical 9V Battery Life
• Guaranteed Zero Reading for 0V Input on All Scales
• True Polarity at Zero for Precise Null Detection
• 1pA Typical Input Current
• True Differential Input and Reference
• Direct LCD Display Drive - No External Components
Required
• Pin Compatible With the ICL7106
• Low Noise - Less Than 15µVP-P
• On-Chip Clock and Reference
• Low Power Dissipation Guaranteed Less Than 1mW
• No Additional Active Circuits Required
Pb-Free Available (RoHS Compliant)
Pinout
ICL7126 (PDIP)
TOP VIEW
V+ 1
D1 2
C1 3
B1 4
(1s) A1 5
F1 6
G1 7
E1 8
D2 9
C2 10
B2 11
(10s)
A2 12
F2 13
E2 14
D3 15
B3 16
(100s)
F3 17
E3 18
(1000) AB4 19
POL 20
(MINUS)
40 OSC 1
39 OSC 2
38 OSC 3
37 TEST
36 REF HI
35 REF LO
34 CREF+
33 CREF-
32 COMMON
31 IN HI
30 IN LO
29 A-Z
28 BUFF
27 INT
26 V-
25 G2 (10s)
24 C3
23 A3 (100s)
22 G3
21 BP/GND
1 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. 2003, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.



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ICL7126 pdf
ICL7126
Absolute Maximum Ratings
Supply Voltage V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Analog Input Voltage (Either Input) (Note 1) . . . . . . . . . . . . .V+ to V-
Reference Input Voltage (Either Input) . . . . . . . . . . . . . . . . .V+ to V-
Clock Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST to V+
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
Thermal Information
Thermal Resistance (Typical, Note 2)
θJA (oC/W)
PDIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
NOTE: Pb-free PDIPs can be used for through hole wave solder
processing only. They are not intended for use in Reflow solder
processing applications.
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. Input voltages may exceed the supply voltages provided the input current is limited to ±100µA.
2. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications TA = 25oC, VREF = 100mV, fCLOCK = 48kHz (Notes 1, 3)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
SYSTEM PERFORMANCE
Zero Input Reading
VIN = 0.0V, Full Scale = 200mV
-000.0 ±000.0 +000.0 Digital
Reading
Ratiometric Reading
VlN = VREF, VREF = 100mV
999 999/100 1000 Digital
0 Reading
Rollover Error
-VIN = +VlN 200mV
Difference in Reading for Equal Positive and Negative
Inputs Near Full Scale
- ±0.2 ±1 Counts
Linearity
Full Scale = 200mV or Full Scale = 2V Maximum Deviation
from Best Straight Line Fit (Note 5)
-
±0.2 ±1 Counts
Common Mode Rejection Ratio
Noise
VCM = ±1V, VIN = 0V, Full Scale = 200mV (Note 5)
- 50 - µV/V
VIN = 0V, Full Scale = 200mV
- 15 - µV
(Peak-To-Peak Value Not Exceeded 95% of Time) (Note 5)
Leakage Current Input
Zero Reading Drift
Scale Factor Temperature Coefficient
VlN = 0V (Note 5)
VlN = 0V, 0oC To 70oC (Note 5)
(VEINxt.=R1e9f9. m0pVp,m0/o×CoCTo)
70oC,
(Note
5)
- 1 10 pA
- 0.2 1 µV/oC
- 1 5 ppm/oC
V+ Supply Current
COMMON Pin Analog Common Voltage
VIN = 0V (Does Not Include COMMON Current)
25kBetween Common and Positive Supply
(With Respect to + Supply)
Temperature Coefficient of Analog Common 25kBetween Common and Positive Supply
(With Respect to + Supply) (Note 5)
- 70 100 µA
2.4 3.0 3.2
V
- 80 - ppm/oC
Peak-To-Peak Segment Drive Voltage
Peak-To-Peak Backplane Drive Voltage
V+ = to V- = 9V (Note 4)
4 5.5 6
V
Power Dissipation Capacitance
vs Clock Frequency
- 40 - pF
NOTES:
3. Unless otherwise noted, specifications are tested using the circuit of Figure 1.
4. Back plane drive is in phase with segment drive for ‘off’ segment, 180 degrees out of phase for ‘on’ segment. Frequency is 20 times conversion
rate. Average DC component is less than 50mV.
5. Not tested, guaranteed by design.
2 FN3084.5



Part Number ICL7126
Description Single Chip A/D Converter
Maker Intersil - Intersil
Total Page 15 Pages
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