MAX1280, MAX1280B, MAX1281, MAX1281B 400ksps/300ksps、单电源、低功耗、8通道、串行12位ADC，内置电压基准

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The MAX1280/MAX1281 12-bit ADCs combine an 8-channel analog-input multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX1280 operates from a single +4.5V to +5.5V supply; the MAX1281 operates from a single +2.7V to +3.6V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/pseudo-differential operation.

The 4-wire serial interface connects directly to SPI™/QSPI™/MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1280/MAX1281 use an external serial-interface clock to perform successive-approximation analog-to-digital conversions. Both parts feature an internal +2.5V reference and a reference-buffer amplifier with a ±1.5% voltage-adjustment range. An external reference with a 1V to V_DD1 range may also be used.

The MAX1280/MAX1281 provide a hard-wired active-low SHDN pin and four software-selectable power modes (normal operation, reduced power, fast power-down, and full power-down). These devices can be programmed to automatically shut down at the end of a conversion or to operate with reduced power. When using the power-down modes, accessing the serial interface automatically powers up the devices, and the quick turn-on time allows them to be powered down between all conversions. This technique can cut supply current to under 100µA at reduced sampling rates.

The MAX1280/MAX1281 are available in 20-pin TSSOP packages. These devices are higher-speed versions of the MAX146/MAX147 (for more information, see the respective data sheet).

关键特性

应用/使用

8-Channel Single-Ended or 4-Channel Pseudo-Differential Inputs
Internal Multiplexer and Track/Hold
Single-Supply Operation
- +4.5V to +5.5V (MAX1280)
- +2.7V to +3.6V (MAX1281)
Internal +2.5V Reference
400ksps Sampling Rate (MAX1280)
Low Power 2.5mA (400ksps)
- 1.3mA (Reduced-Power Mode)
- 0.9mA (Fast Power-Down Mode)
- 2µA (Full Power-Down)
SPI/QSPI/MICROWIRE/TMS320-Compatible
- 4-Wire Serial Interface
Software-Configurable Unipolar or Bipolar Inputs
20-Pin TSSOP Package

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	数据采集
	医疗仪器
	笔输入量化器
	便携式数据记录
	过程控制

Key Specifications: Precision ADCs (< 5Msps)

Part Number

ADC Resolution (Bits)

Input Channels

Conv. Rate (ksps)

Max. Conv. Time (µs)

Data Bus (Bits)

Ref. (V)

Diff. In

Supply Voltage (V)

Typ. Supply Current (mA)

Typ. Power (mW)

Low Power Mode

Standby Mode

EV-Kit

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX1280

400

2.5

Serial

Ext
Int +2.5

Yes

2.5

13.75

Yes

TSSOP/20

-40 to +85
0 to +70

$5.24 @ 1k

MAX1281

300

3.3

3
3.3

$5.24 @ 1k

See All Precision ADCs (< 5Msps) (301)

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.