Features Specified over a range of sample rates. 6-lead LLP and SOT-23 packages Variable power management Single power supply with 2.7V - 5.25V range SPI™/QSPI™/MICROWIRE/DSP compatible Description The ADC121S021 is a low-power, single channel CMOS 12-bit analog-to-digital converter with a high-speed serial interface. Unlike the conventional practice of specifying performance at a single sample rate only, the ADC121S021 is fully specified over a sample rate range of 50 ksps to 200 ksps. The converter is based upon a successive-approximation register architecture with an internal track-and-hold circuit. The output serial data is straight binary, and is compatible with several standards, such as SPI™, QSPI™, MICROWIRE, and many common DSP serial interfaces. The ADC121S021 operates with a single supply that can range from +2.7V to +5.25V. Normal power consumption using a +3.6V or +5.25V supply is 1.5 mW and 7.9 mW, respectively. The power-down feature reduces the power consumption to as low as 2.6 µW using a +5.25V supply. The ADC121S021 is packaged in 6-lead LLP and SOT-23 packages. Operation over the industrial temperature range of −40°C to +85°C is guaranteed. Key Specification DNL +0.45 / -0.25 LSB (typ) INL +0.45 / -0.4 LSB (typ) SNR 72.3 dB (typ) Power Consumption 3.6V Supply 1.5 mW (typ) 5.25V Supply 7.9 mW (typ) Applications Portable Systems Remote Data Acquisition Instrumentation and Control Systems

Also Recommended ADC081S021▲ For 8 Bits ADC101S021▲ For 10 Bits ADC121S051▲ For Speeds From 200Ksps To 500Ksps ADC121S101▲ For Speeds From 500Ksps To 1Msps. ADC121S625▲ Differential Input, External Reference, MSOP Package

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	ADC121S021 Single Channel, 50 to 200 ksps, 12-Bit A/D Converter	374 Kbytes	13-Jan-10

Other Technical Documents

Title		Type	Date
	Improving Machinery Vibration Analysis	Signal Path Designer	2006-07-07
	Low-Voltage Current Loop Transmitter	Signal Path Designer	2007-08-02
	Minimizing ADC Power Consumption	External Article	2008-08-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
ADC121S021CIMF/NOPB ADC121S021CIMF RoHS Status	SOT-23	Full production Lead Time: 12 weeks	Distributor Region Qty AITG Asia Pacific 514 ARROW Worldwide 2013 DIGI-KEY Worldwide 2748 FARNELL Europe and Asia 1676 MOUSER Worldwide 938 NEWARK Americas 162 RS COMPONENTS Worldwide 10 RSL MICRO Asia Pacific 1000 TAYLOR Americas 2013 TECHMOSA Asia Pacific 6000	$1.16 each at 1K+ pcs	reel of 1000
ADC121S021CIMFX/NOPB ADC121S021CIMFX RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.16 each at 1K+ pcs	reel of 3000
ADC121S021CISD/NOPB ADC121S021CISD RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 DIGI-KEY Worldwide 1801 MOUSER Worldwide 945 RS COMPONENTS Worldwide 25 TAYLOR Americas 1000	$1.16 each at 1K+ pcs	reel of 1000
ADC121S021CISDX/NOPB ADC121S021CISDX RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.16 each at 1K+ pcs	reel of 4500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for ADC121S021.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for ADC121S021 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
ADC121S021CIMF/NOPB ADC121S021CIMF	15.063 15.2	SOT-23	6	1 1	260 260	Detail	Download	N/A	X07C XTT
ADC121S021CIMFX/NOPB ADC121S021CIMFX	15.063 15.2	SOT-23	6	1 1	260 260	Detail	Download	N/A	X07C XTT
ADC121S021CISD/NOPB ADC121S021CISD	11.721 11.105	LLP	6	1 1	260 260	Detail	Download	N/A	XTT X7C
ADC121S021CISDX/NOPB ADC121S021CISDX	11.721 11.105	LLP	6	1 1	260 260	Detail	Download	N/A	XTT X7C

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for ADC121S021.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for ADC121S021 is located at RoHS Status.

Design Tools

Title	Size	Date
Evaluation Boards & Development Systems
"To evaluate the ADC121S021, order the ADC121S101EVAL evaluation board"

CAD Symbols and Models Download ADC121S021 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
ADC121S021CIMF	CMOS7	0	21301	0	0	1584000	3	449464325
ADC121S021CIMFX	CMOS7	0	21301	0	0	1584000	3	449464325
ADC121S021CISD	CMOS7	0	21301	0	0	1584000	3	449464325
ADC121S021CISDX	CMOS7	0	21301	0	0	1584000	3	449464325

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for ADC121S021.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for ADC121S021 is located at RoHS Status.