MAX1272：Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range

Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range

The MAX1272/MAX1273 multirange 12-bit data-acquisition systems (DAS) operate with a single 5V supply. The software-programmable analog input accepts a variety of voltage ranges: ±10V, ±5V, 0 to 10V, 0 to 5V for the MAX1272; ±VREF, ±VREF / 2, 0 to VREF, 0 to VREF / 2 for the MAX1273. The software-selectable extended analog input range increases the effective dynamic range to 14 bits and provides the flexibility to interface 4-20mA powered sensors directly to a single 5V system. In addition, the MAX1272 provides fault protection to ±12V. Other features include a 5MHz track/hold (T/H) bandwidth, 87ksps throughput rate, and internal (4.096V) or external (2.40V to 4.18V) reference. The MAX1272/MAX1273 serial interfaces connect directly to SPI/QSPI™/MICROWIRE®-compatible devices without any external logic. Four software-programmable power-down modes (delayed standby, immediate standby, delayed full power-down, and immediate full power-down) provide low-current shutdown between conversions. In standby mode, the internal reference buffer remains active, thus eliminating startup delay. The MAX1272/MAX1273 are available in an 8-pin µMAX® package. Both devices are available in the extended (-40°C to +85°C) temperature range.

Key Features

Four Software-Selectable Input Ranges
- MAX1272: 0 to 10V, 0 to 5V, ±10V, ±5V
- MAX1273: 0 to VREF, 0 to VREF / 2, ±VREF, ±VREF / 2
12-Bit Resolution, No Missing Codes
5V Single-Supply Operation
SPI/QSPI/MICROWIRE-Compatible 3-Wire Interface
87ksps Sampling Rate
±12V Fault-Protected Analog Input (MAX1272)
Internal (4.096V) or External (2.4V to 4.18V) Reference
Low Power
- 1.5mA at 87ksps
- 0.4mA at 10ksps
- 0.2mA at 1ksps
Four Power-Down Modes
8-Pin PDIP Package

MAX1272, MAX1273: Typical Operating Circuit

Applications/Uses

Automatic Testing
Battery-Powered Instruments
Data Acquisition Systems
Industrial Control Systems
Medical Instruments
Robotics

DataSheet

title	Download file
MAX1272-MAX1273 Data Sheet	MAX1272-MAX1273.pdf

Parametrics

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)	External V_REF (V)	Unipolar V_IN (V)	Bipolar V_IN (±V)	SNR (dB)	THD (dB)	INL (±LSB)	Package/Pins	Budgetary Price
Part Number	ADC	Input Chan.	max	ADC Architecture	Data Bus	Diff/S.E. Input	nominal	min	max	max	max	SNR (dB)	THD (dB)	INL (±LSB)	Package/Pins	See Notes
MAX1272	12	1	87	SAR	SPI	S.E. Only	4.096	2.4	4.18	10	10	70	-87	0.3	µMAX/8 PDIP(N)/8	$3.33 @1k
MAX1273	12	1	87	SAR	SPI	S.E. Only	4.096	2.4	4.18	4.096	2.048	-	-87	0.3	µMAX/8 PDIP(N)/8	$11.24 @500

Design kits & evaluation modules

MAX1272EVSYS

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX1272CPA	No Longer Available		PDIP(N),;8 pin;79.7 mm²	0°C to +70°C	No
MAX1272CPA+	No Longer Available	MAX1272CUA+	PDIP(N),;8 pin;79.7 mm²	0°C to +70°C	Lead Free
MAX1272CUA+	Active		µMAX,;8 pin;15.6 mm²	0°C to +70°C	Lead Free
MAX1272CUA+T	Active		µMAX,;8 pin;15.6 mm²	0°C to +70°C	Lead Free
MAX1272EPA	No Longer Available		PDIP(N),;8 pin;79.7 mm²	-40°C to +85°C	No
MAX1272EPA+	No Longer Available	MAX1272EUA+	PDIP(N),;8 pin;79.7 mm²	-40°C to +85°C	Lead Free
MAX1272EUA+	Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
MAX1272EUA+T	Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
MAX1272EVKIT	No Longer Available		EVKIT;	-40°C to +85°C	See data sheet

MAX1272-MAX1273.pdf MAX1273