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National Semiconductor - 10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold

Numéro de référence ADC20461CIWM
Description 10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold
Fabricant National Semiconductor 
Logo National Semiconductor 





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ADC20461CIWM fiche technique
June 1999
ADC10461/ADC10462/ADC10464
10-Bit 600 ns A/D Converter with Input Multiplexer and
Sample/Hold
General Description
Using an innovative, patented multistep* conversion tech-
nique, the 10-bit ADC10461, ADC10462, and ADC10464
CMOS analog-to-digital converters offer sub-microsecond
conversion times yet dissipate a maximum of only 235 mW.
The ADC10461, ADC10462, and ADC10464 perform a
10-bit conversion in two lower-resolution “flashes”, thus
yielding a fast A/D without the cost, power dissipation, and
other problems associated with true flash approaches. Dy-
namic performance (THD, S/N) is guaranteed. The
ADC10461 is pin-compatible with the ADC1061 but much
faster, thus providing a convenient upgrade path for the
ADC1061.
The analog input voltage to the ADC10461, ADC10462, and
ADC10464 is sampled and held by an internal sampling cir-
cuit. Input signals at frequencies from dc to over 200 kHz
can therefore be digitized accurately without the need for an
external sample-and-hold circuit.
The ADC10462 and ADC10464 include a “speed-up” pin.
Connecting an external resistor between this pin and ground
reduces the typical conversion time to as little as 350 ns with
only a small increase in linearity error.
For ease of interface to microprocessors, the ADC10461,
ADC10462, and ADC10464 have been designed to appear
as a memory location or I/O port without the need for exter-
nal interface logic.
Features
n Built-in sample-and-hold
n Single +5V supply
n 1, 2, or 4-input multiplexer options
n No external clock required
n Speed adjust pin for faster conversions (ADC10462 and
ADC10464)
Key Specifications
n Conversion time to 10 bits
n Sampling Rate
n Low power dissipation
n Total harmonic distortion (50 kHz)
n No missing codes over temperature
600 ns typical
800 kHz
235 mW (max)
−60 dB (max)
Applications
n Digital signal processor front ends
n Instrumentation
n Disk drives
n Mobile telecommunications
Note: *U.S. Patent Number 4918449
Ordering Information
Industrial Temp Range
(−40˚C TA +85˚C)
ADC20461CIWM
ADC20462CIWM
ADC20464CIWM
Package
M20B Small Outline
M24B Small Outline
M28B Small Outline
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011108
www.national.com

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