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ADC081C021 Dataheets PDF



Part Number ADC081C021
Manufacturers National Semiconductor
Logo National Semiconductor
Description 12-Bit Analog-to-Digital Converter
Datasheet ADC081C021 DatasheetADC081C021 Datasheet (PDF)

ADC121C021/ADC121C027 I2C-Compatible, 12-Bit Analog-to-Digital Converter (ADC) with Alert January 17, 2008 ADC121C021/ADC121C027 I2C-Compatible, 12-Bit Analog-to-Digital Converter (ADC) with Alert Function General Description The ADC121C021 is a low-power, monolithic, 12-bit, analogto-digital converter(ADC) that operates from a +2.7 to 5.5V supply. The converter is based on a successive approximation register architecture with an internal track-and-hold circuit that can handle input frequencie.

  ADC081C021   ADC081C021


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ADC121C021/ADC121C027 I2C-Compatible, 12-Bit Analog-to-Digital Converter (ADC) with Alert January 17, 2008 ADC121C021/ADC121C027 I2C-Compatible, 12-Bit Analog-to-Digital Converter (ADC) with Alert Function General Description The ADC121C021 is a low-power, monolithic, 12-bit, analogto-digital converter(ADC) that operates from a +2.7 to 5.5V supply. The converter is based on a successive approximation register architecture with an internal track-and-hold circuit that can handle input frequencies up to 11MHz. The ADC121C021 operates from a single supply which also serves as the reference. The device features an I2C-compatible serial interface that operates in all three speed modes, including high speed mode (3.4MHz). The ADC's Alert feature provides an interrupt that is activated when the analog input violates a programmable upper or lower limit value. The device features an automatic conversion mode, which frees up the controller and I2C interface. In this mode, the ADC continuously monitors the analog input for an "out-of-range" condition and provides an interrupt if the measured voltage goes out-of-range. The ADC121C021 comes in a small TSOT-6 package with an alert output. The ADC121C027 comes in a small TSOT-6 package with an address selection input. The ADC121C027 provides three pin-selectable addresses. Pin-compatible alternatives are available with additional address options. Normal power consumption using a +3V or +5V supply is 0.26mW or 0.78mW, respectively. The automatic powerdown feature reduces the power consumption to less than 1µW while not converting. Operation over the industrial temperature range of −40°C to +105°C is guaranteed. Their low power consumption and small packages make this family of ADCs an excellent choice for use in battery operated equipment. The ADC121C021 and ADC121C027 are part of a family of pin-compatible ADCs that also provide 8 and 10 bit resolution. For 8-bit ADCs see the ADC081C021 and ADC081C027. For 10-bit ADCs see the ADC101C021 and ADC101C027. Features ■ I2C-Compatible 2-wire Interface which supports standard ■ ■ ■ ■ ■ ■ (100kHz), fast (400kHz), and high speed (3.4MHz) modes Extended power supply range (+2.7V to +5.5V) Up to four pin-selectable chip addresses Out-of-range Alert Function Automatic Power-down mode while not converting Very small 6-pin TSOT packages ±8kV HBM ESD protection (SDA, SCL) Key Specifications ■ ■ ■ ■ ■ Resolution 12 bits; no missing codes Conversion Time 1µs (typ) INL & DNL ±1 LSB (max) (up to 22kSPS) Throughput Rate 188.9kSPS (max) Power Consumption (at 22kSPS) 0.26 mW (typ) — 3V Supply 0.78 mW (typ) — 5V Supply Applications ■ ■ ■ ■ ■ System Monitoring Peak Detection Portable Instruments Medical Instruments Test Equipment Pin-Compatible Alternatives All devices are fully pin and function compatible. Resolution ALERT Output ADDR Input 12-bit 10-bit 8-bit ADC121C021 ADC101C021 ADC081C021 ADC121C027 ADC101C027 ADC081C027 Connection Diagrams 30020901 30020902 I2C® is a registered trademark of Phillips Corporation. © 2008 National Semiconductor Corporation 300209 www.national.com Free Datasheet http://www.datasheet4u.com/ ADC121C021/ADC121C027 Ordering Information Order Code ADC121C021CIMK ADC121C021CIMKX ADC121C027CIMK ADC121C027CIMKX Option Alert pin Alert pin Address pin Address pin Shipped with the ADC121C021. Also compatible with the ADC121C027 option. Please order samples. Package TSOT-6 TSOT-6 Tape-and-Reel TSOT-6 TSOT-6 Tape-and-Reel Top Mark X30C X30C X31C X31C ADC121C021EB Evaluation Board Block Diagram 30020903 www.national.com 2 Free Datasheet http://www.datasheet4u.com/ ADC121C021/ADC121C027 Pin Descriptions Symbol VA GND VIN ALERT Type Supply Ground Analog Input Digital Output See Figure 4 Equivalent Circuit Description Power and unbufferred reference voltage. VA must be free of noise and decoupled to GND. Ground for all on-chip circuitry. Analog input. This signal can range from GND to VA. Alert output. Can be configured as active high or active low. This is an open drain data line that must be pulled to the supply (VA) with an external pull-up resistor. Serial Clock Input. SCL is used together with SDA to control the transfer of data in and out of the device. This is an open drain data line that must be pulled to the supply (VA) with an external pull-up resistor. This pin's extended ESD tolerance( 8kV HBM) allows extension of the I2C bus across multiple boards without extra ESD protection. Serial Data bi-directional connection. Data is clocked into or out of the internal 16-bit register with SCL. This is an open drain data line that must be pulled to the supply (VA) with an external pull-up resistor. This pin's extended ESD tolerance( 8kV HBM) allows extension of the I2C bus across multiple boards without extra ESD protection. SCL Digital Input SDA Digital Input/Output ADDR Digital Input, three levels Tri-level Address Selection Input. Sets Bits A0 & A1 of the 7-bit slave address. (see Table 1) P.


AD8468 ADC081C021 ADC081C027


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