MAX149BCAP+ by Analog Devices

+2.7V to +5.25V Low-Power 8-Channel Serial 10-Bit ADCs


The MAX148/MAX149 10-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single +2.7V to +5.25V supply, and sample to 133ksps. 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 MAX148/MAX149 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The MAX149 has an internal 2.5V reference, while the MAX148 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range. These devices provide a hard-wired active-low SHDN 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 MAX148/MAX149, 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 MAX148/MAX149 are available in 20-pin PDIP and 20-pin SSOP packages. For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet.

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Prices starting from US$8.27

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Features

8-Channel Single-Ended or 4-Channel Differential Inputs
Single-Supply Operation: +2.7V to +5.25V
Internal 2.5V Reference (MAX149)
Low Power: 1.2mA (133ksps, 3V Supply) 54µA (1ksps, 3V Supply) 1µA (Power-Down Mode)
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 PDIP/SSOP Packages

Specifications

Resolution (bits) (ADC) 10
# Input Channels 8
Conv. Rate (ksps) (max) 133
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 2.5
External VREF (V) (min) 1
External VREF (V) (max) 5.25
Unipolar VIN (V) (max) 2.5
Bipolar VIN (±V) (max) 1.25
INL (±LSB) 1
Package/Pins SSOP/20
BudgetaryPrice (See Notes) 5.37


MAX149BCAP+ Data & Signal Conversion by Analog Devices

ADC 8-CH SAR 10BIT 133KSPS SSOP-20

Status: Unknown
Series: Octal 10-Bit SAR ADCs
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

The MAX148/MAX149 10-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single +2.7V to +5.25V supply, and sample to 133ksps. Both devices’ analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation. The 4-wire serial interface connects directly to SPI/ QSPIK and MICROWIREK devices without external logic. A serial-strobe output allows direct connection to TMS320-family digital signal processors. The MAX148/ MAX149 use either the internal clock or an external seri- al-interface clock to perform successive-approximation analog-to-digital conversions. The MAX149 has an internal 2.5V reference, while the MAX148 requires an external reference. Both parts have a reference-buffer amplifier with a Q1.5% voltage- adjustment range. These devices provide a hard-wired SHDN pin and a software-selectable power-down, and can be pro- grammed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX148/MAX149, and the quick turn-on time allows them to be shut down between all conver- sions. This technique can cut supply current to under 60FA at reduced sampling rates. The MAX148/MAX149 are available in 20-pin PDIP and 20-pin SSOP packages. For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet.

Specifications

Resolution (Bits) 10bit
Sampling Rate 133kSPS
Input Channel Type Differential Single Ended
Data Interface SPI
Supply Voltage Type Single
Supply Voltage Min 2.7V
Supply Voltage Max 5.25V
ADC / DAC Case Style SSOP
No. of Pins 20Pins
Operating Temperature Min 0°C
Operating Temperature Max 70°C
Product Range Octal 10-Bit SAR ADCs
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

+2.7V to +5.25V Low-Power 8-Ch | Analog Devices
ADC, 8-CH, SAR, 10BIT, 133KSPS, SSOP-20 | Farnell

Frequently Asked Questions

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Is the MAX149BCAP+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Analog Devices, element14 and Farnell have stock available or on a lead time for MAX149BCAP+ .

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