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ADC12C105 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – 12-Bit, 95/105 MSPS A/D Converter | |||
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August 2007
ADC12C105
12-Bit, 95/105 MSPS A/D Converter
General Description
The ADC12C105 is a high-performance CMOS analog-to-
digital converter capable of converting analog input signals
into 12-bit digital words at rates up to 105 Mega Samples Per
Second (MSPS). This converter uses a differential, pipelined
architecture with digital error correction and an on-chip sam-
ple-and-hold circuit to minimize power consumption and the
external component count, while providing excellent dynamic
performance. A unique sample-and-hold stage yields a full-
power bandwidth of 1 GHz. The ADC12C105 may be oper-
ated from a single +3.0V or +3.3V power supply and
consumes low power.
A separate +2.5V supply may be used for the digital output
interface which allows lower power operation with reduced
noise. A power-down feature reduces the power consumption
to very low levels while still allowing fast wake-up time to full
operation. The differential inputs accept a 2V full scale differ-
ential input swing. A stable 1.2V internal voltage reference is
provided, or the ADC12C105 can be operated with an exter-
nal 1.2V reference. Output data format (offset binary versus
2's complement) and duty cycle stabilizer are pin-selectable.
The duty cycle stabilizer maintains performance over a wide
range of clock duty cycles.
The ADC12C105 is available in a 32-lead LLP package and
operates over the industrial temperature range of â40°C to
+85°C.
Features
â 1 GHz Full Power Bandwidth
â Internal reference and sample-and-hold circuit
â Low power consumption
â Data Ready output clock
â Clock Duty Cycle Stabilizer
â Single +3.0V or +3.3V supply operation
â Power-down mode
â 32-pin LLP package, (5x5x0.8mm, 0.5mm pin-pitch)
Key Specifications
â Resolution
â Conversion Rate
â SNR (fIN = 240 MHz)
â SFDR (fIN = 240 MHz)
â Full Power Bandwidth
â Power Consumption
â
12 Bits
105 MSPS
69 dBFS (typ)
82 dBFS (typ)
1 GHz (typ)
350 mW (typ), VA=3.0V
400 mW (typ), VA=3.3V
Applications
â High IF Sampling Receivers
â Wireless Base Station Receivers
â Test and Measurement Equipment
â Communications Instrumentation
â Portable Instrumentation
Connection Diagram
© 2007 National Semiconductor Corporation 300231
30023101
www.national.com
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