ADC10662/ADC10664
10-Bit 360 ns A/D Converter with Input Multiplexer and
Sample/Hold
General Description
Features
NOTE: The ADC10661 and ADC10662 are obsolete. They
are described here for reference only.
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Using an innovative, patented multistep* conversion technique, these 10-bit CMOS analog-to-digital converters offer
sub-microsecond conversion times yet dissipating a maximum of only 235 mW. These converters perform 10-bit conversions in two lower-resolution “flashes”, yielding a fast A/D
without the cost, power consumption, and other problems
associated with true flash approaches. In addition to standard static performance specifications (Linearity, Full-Scale
Error, etc.), dynamic performance (THD, S/N) is guaranteed.
The analog input voltage ADC is sampled and held by an
internal sampling circuit. Input signals at frequencies from
DC to over 250 kHz can therefore be digitized accurately
without the need for an external sample-and-hold circuit.
Connecting an external resistor between the “speed-up” pin
and ground reduces the typical conversion time to as little as
360 ns for a small linearity sacrifice.
For ease of interface to microprocessors, the ADC10662 and
ADC10664 have been designed to appear as a memory
location or I/O port without the need for external interface
logic.
Built-in sample-and-hold
Single +5V supply
No external clock required
Speed Adjust pin for faster conversions
Key Specifications
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Conversion Time
Max. Sampling Rate:
Low Power Consumption
Total harmonic distortion (50 kHz):
No Missing Codes
360 ns (typical)
1.5 MHz (min)
235 mW (max)
−60 dB (max)
Over Temperature
Applications
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Digital signal processor front ends
Instrumentation
Disk drives
Mobile telecommunications
Simplified Block Diagram
01119209
*ADC10664 Only
*U.S. Patent Number 4918449
TRI-STATE ® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation
DS011192
www.national.com
ADC10662/ADC10664 10-Bit 360 ns A/D Converter with Input Multiplexer and Sample/Hold
April 2006
