ADC081S051
Single Channel, 500 kSPS, 8-Bit A/D Converter
General Description
The ADC081S051 is a low-power, single channel CMOS
8-bit analog-to-digital converter with a high-speed serial in-
terface. Unlike the conventional practice of specifying per-
formance at a single sample rate only, the ADC081S051 is
fully specified over a sample rate range of 200 kSPS to 500
kSPS. The converter is based on a successive-
approximation register architecture with an internal track-
and-hold circuit.
The output serial data is straight binary, and is compatible
with several standards, such as SPI™, QSPI™,
MICROWIRE, and many common DSP serial interfaces.
The ADC081S051 operates with a single supply that can
range from +2.7V to +5.25V. Normal power consumption
using a +3V or +5V supply is 2.9 mW and 10.5 mW, respec-
tively. The power-down feature reduces the power consump-
tion to as low as 2.6 µW using a +5V supply.
The ADC081S051 is packaged in an 6-lead LLP package.
Operation over the industrial temperature range of −40˚C to
+85˚C is guaranteed.
Features
n Specified over a range of sample rates.
n 6-lead LLP package
n Variable power management
n Single power supply with 2.7V - 5.25V range
n SPI™/QSPI™/MICROWIRE/DSP compatible
Key Specifications
n DNL + 0.07 / −0.06 LSB (typ)
n INL + 0.06 / −0.07 LSB (typ)
n SNR 49.6 dB (typ)
n Power Consumption
— 3V Supply 2.9 mW (typ)
— 5V Supply 10.5 mW (typ)
Applications
n Portable Systems
n Remote Data Aquisitions
n Instrumentation and Control Systems
Pin-Compatible Alternatives by Resolution and Speed
All devices are fully pin and function compatible.
Resolution Specified for Sample Rate Range of:
50 to 200 kSPS 200 to 500 kSPS 500 kSPS to 1 MSPS
12-bit ADC121S021 ADC121S051 ADC121S101
10-bit ADC101S021 ADC101S051 ADC081S101
8-bit ADC081S021 ADC081S051 ADC081S101
Connection Diagram
20145505
Ordering Information
Order Code Temperature Range Description Top Mark
ADC081S051CISD −40˚C to +85˚C 6-Lead LLP Package X6C
ADC081S051CISDX −40˚C to +85˚C 6-Lead LLP Package, Tape & Reel X6C
TRI-STATE
®
is a trademark of National Semiconductor Corporation
QSPI™ and SPI™ are trademarks of Motorola, Inc.
April 2005
ADC081S051
Single
Channel,
500
kSPS,
8-Bit
A/D
Converter
© 2005 National Semiconductor Corporation DS201455 www.national.com