The MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX146 operates from a single +2.7V to +3.6V supply; the MAX147 operates from a single +2.7V to +5.25V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/ QSPI™ and MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX146 has an internal 2.5V reference, while the MAX147 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range.

These devices provide a hard-wired SHDN-bar pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates.

The MAX146/MAX147 are available in 20-pin DIP and SSOP packages.

For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.

MAX146, MAX147: Typical Operating Circuit

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Key Features

8-Channel Single-Ended or 4-Channel Differential Inputs
Single-Supply Operation
- +2.7V to +3.6V (MAX146)
- +2.7V to +5.25V (MAX147)
Internal 2.5V Reference (MAX146)
Low Power
- 1.2mA (133ksps, 3V supply)
- 54µA (1ksps, 3V supply)
- 1µA (power-down mode)
SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
Software-Configurable Unipolar or Bipolar Inputs
20-Pin DIP/SSOP Packages

Applications/Uses

Battery-Powered Applications
Data Acquisition
Medical Instruments
Pen Digitizers
Portable Data Logging
Process Control

Parametric Specs

Part Number

Resolution
(bits)

Input Chan.

Conv. Rate
(ksps)

ADC Architecture

Data Bus

Diff/S.E. Input

Internal V_REF
(V)

External V_REF
(V)

Unipolar V_IN
(V)

Bipolar V_IN
(±V)

THD
(dB)

INL
(±LSB)

Package/Pins

Budgetary
Price

ADC

max

nominal

min

max

See Notes

MAX146

133

SAR

SPI

Both

2.5

3.6

2.5

1.25

-88

PDIP/20

SSOP/20

$9.49 @1k

MAX147

5.25

PDIP/20

SSOP/20

$2.95 @1k

See All Precision ADCs (< 5Msps) (443)

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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX146EVKIT: Evaluation Kit for the MAX146 and MAX147
MAX147EVKIT: Evaluation Kit for the MAX146 and MAX147

Technical Documents

App Note 1108 Understanding Single-Ended, Pseudo-Differential and Fully-Differential ADC Inputs

Quality and Environmental Data

Product Reliability Reports: MAX146.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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