1FEATURES
2• 1 GHz Full Power Bandwidth
• Internal Reference and Sample-and-Hold
Circuit
• Low Power Consumption
• Data Ready Output Clock
• Clock Duty Cycle Stabilizer
• Single +3.0V or +3.3V Supply Operation sample•
Power-Down Mode
• 32-Pin WQFN Package, (5x5x0.8mm, 0.5mm
Pin-Pitch)

APPLICATIONS
• High IF Sampling Receivers
• Wireless Base Station Receivers
• Test and Measurement Equipment
• Communications Instrumentation
• Portable Instrumentation

KEY SPECIFICATIONS
• Resolution: 12 Bits
• Conversion Rate: 105 MSPS
• SNR: (fIN = 240 MHz) 69 dBFS (typ)
• SFDR: (fIN = 240 MHz) 82 dBFS (typ)
• Full Power Bandwidth: 1 GHz (typ)
• Power Consumption:
– 350 mW (typ), VA=3.0 V
– 400 mW (typ), VA=3.3 V

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 sampleand-
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 operated 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 differential
input swing. A stable 1.2V internal voltage reference
is provided, or the ADC12C105 can be operated with
an external 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 WQFN
package and operates over the industrial temperature
range of −40°C to +85°C.