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MAX135
±15-Bit, Low-Power ADC with Parallel Interface
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Status
Active: In Production.
Description
The MAX135 is a CMOS 15-bit, binary-output analog-to-digital converter (ADC). Multi-slope integration provides low-noise and high-resolution conversions in less time than standard integrating ADCs: The MAX135 is tested at 16 conversions per second, but operates at up to 6 times that rate. The MAX135 uses Super LSBs with data averaging to achieve 18-bit resolution.
Supply current is 125µA maximum during normal operation and only 10µA maximum in sleep mode. Low conversion noise allows tested operation at only 300mV full scale (15µV per LSB). A simple 8-bit parallel data bus and three control lines easily interface to all common microprocessors, and twos-complement output coding simplifies bipolar measurements.
High resolution and compact size make the MAX135 ideal for data loggers, numerical control systems, weight scales, data-acquisition systems, and panel meters. The MAX135 comes in 28-pin DIP and SO packages in both commercial and extended temperature grades.
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Data Sheet
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Key Features
- 15-bit, Multi-slope Integration ADC
- 15µV Resolution at 16 Conv/Sec
- Low Supply Current
- 125µA Max (Normal Operation)
- 10µA Max (Sleep-Mode Operation)
- ±0.005% Accuracy at 16 Conv/Sec
- 3 Super Bits for 18-Bit Resolution
- Low Noise—Operates at 300mV Full Scale
- Easy µP Interface—8-Bit Parallel Data Bus
- ±10pA Input Leakage Current
- Small 28 pin DIP and SO packages
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Applications/Uses
- Analog-Signal Measurement: Pressure, Flow, Temperature, Voltage, Current, Resistance, Weight
- Battery-Powered Instruments
- Control Applications
- Data Acquisition
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Key Specifications:
| Precision ADCs (< 5Msps) |
| Part Number |
Resolution
(bits) |
Input Chan. |
Conv. Rate
(ksps) |
Data Bus
(bits) |
Diff/S.E. Input |
External VREF
(V) |
Bipolar VIN
(±V) |
Package/Pins |
Budgetary Price |
| ADC |
max |
max |
max |
See Notes |
| MAX135 |
15 |
1 |
0.0016 |
µP/8 |
Diff. Only |
0.545 |
0.3 |
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$9.94 @1k |
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See All Precision ADCs (< 5Msps) (417)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
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Information Index
Document Ref.: 19-4131
Rev 0;
1991-09-01
This page last modified: 2008-04-30
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