ADC10461 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold

November 2005
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.
These converters perform 10-bit conversion in two lower-
resolution “flashes”, yielding a fast A/D without the cost,
power consumption, and other problems associated with
true flash approaches. Dynamic performance (THD, S/N) is
guaranteed. The ADC10461 is pin-compatible with the
ADC1061 but is much faster, providing a convenient up-
grade path for the ADC1061.
The analog input voltage is sampled and held by an internal
sampling circuit. 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
n Sampling Rate
n Low Power Consumption
n Total Harmonic Distortion (50 kHz)
n No Missing Codes
600 ns (typical)
800 kHz
235 mW (max)
−60 dB (max)
Over Temperature
Applications
n Digital signal processor front ends
n Instrumentation
n Disk drives
n Mobile telecommunications
Note: *U.S. Patent Number 4918449
Simplified Block Diagram
*ADC10461 Only
**ADC10462 and ADC10464 Only
***ADC10464 Only
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