ISL267440_14 Datasheet, PDF (1/18 Pages) Intersil Corporation – 10-Bit and 12-Bit, 1MSPS SAR ADCs

10-Bit and 12-Bit, 1MSPS SAR ADCs
ISL267440, ISL267450A
The ISL267440 and ISL267450A are 10-bit and 12-bit, 1MSPS
sampling SAR-type ADCs featuring excellent linearity over supply
and temperature variations. These devices are drop-in
compatible with the AD7440 and AD7450A. The robust,
fully-differential input offers high impedance to minimize errors
due to leakage currents, and the specified measurement
accuracy is maintained with input signals up to the supply rails.
The reference accepts inputs from 0.1V to 2.2V for 3V operation
and 0.1V to 3.5V for 5V operation. This provides design flexibility
in a wide variety of applications. The ISL267440, ISL267450A
also feature up to 8kV Human Body Model ESD survivability.
The serial digital interface is SPI compatible and is easily
interfaced to popular FPGAs and microcontrollers. Power
dissipation is 8.5mW at a sampling rate of 1MSPS, and just 5µW
between conversions utilizing Auto Power-Down mode (with a 5V
supply). The ISL267440, ISL267450A are excellent solutions for
remote industrial sensors and battery-powered instruments.
The ISL267440, ISL267450A are available in an 8 lead MSOP
package, and are specified for operation over the Industrial
temperature range (–40°C to +85°C).
Features
• Drop-in Compatible with AD7440, AD7450A
• Differential Input
• Simple SPI-compatible Serial Digital Interface
• Guaranteed No Missing Codes
• 1MHz Sampling Rate
• 3V or 5V Operation
• Low Operating Current
- 1.25mA at 1MSPS with 3V Supplies
- 1.70mA at 1MSPS with 5V Supplies
• Power-down Current between Conversions: 1µA
• Excellent Differential Non-Linearity
• Low THD: -83dB (typ)
• Pb-Free (RoHS Compliant)
• Available in MSOP Package
Applications
• Remote Data Acquisition
• Battery Operated Systems
• Industrial Process Control
• Energy Measurement
• Data Acquisition Systems
• Pressure Sensors
• Flow Controllers
VREF
VDD
VIN+
VIN–
SAR
LOGIC
SERIAL
INTERFACE
SCLK
SDATA
CS
VREF
GND
FIGURE 1. BLOCK DIAGRAM
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0
1024
2048
CODE
3072
4096
FIGURE 2. DIFFERENTIAL LINEARITY ERROR vs CODE
June 28, 2012
1
FN7708.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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