Product Descriptions
The MAX138/MAX139 are 31/2 digit A/D converters (ADCs)with on-board LCD (MAX138) and LED (MAX139) displaydrivers. The MAX138/MAX139 also contain a charge-pump voltage inverter. The charge-pump inverter allowsthe MAX138/MAX139 to measure both positive and nega-tive input voltages while operating from a single power-supply voltage from +2.5V to +7V. The operating circuitsof the MAX138/MAX139 are similar to those of the ICL7136and ICL7137 respectively, except the MAX138/MAX139have an internal oscillator and an external charge-pumpcapacitor connected to pins 38 and 40.
MAX140 is a low segment-current version of the MAX139intended for use with low-current LED displays.
Product Features
Single Supply +2.5V to +7.0V Operation
Measures Both Positive and Negative InputVoltages
Charge-Pump Voltage Inverter Generates aNegative Supply Voltage
Internal Bandgap Reference
On-Board Display Driver
Low Segment Current (MAX140)
Product Applications
+5V Powered Panel Meters
+3V Powered DMMs
Instruments
Portable Monitors
Weigh Scales
Digital Thermometers
Product Specification
| Attribute | Attribute value |
| ANSM-Part# | ANSM-MAX138CPL |
| Category | Integrated Circuits (ICs) |
| Data Acquisition | |
| ADCs/DACs - Special Purpose | |
| Manufacturer | - |
| Series | - |
| Packaging | Tube |
| Part Status | Obsolete |
| Type | ADC |
| Number of Channels | 2 |
| Resolution (Bits) | 3.5 Digit |
| Sampling Rate (Per Second) | - |
| Data Interface | - |
| Voltage Supply Source | Single Supply |
| Voltage - Supply | 2.5V ~ 7V |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Through Hole |
| Package / Case | 40-DIP (0.600", 15.24mm) |
| Supplier Device Package | 40-PDIP |
| Base Product Number | MAX138 |
Product Photos
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