PDF ADC122S706 Data sheet ( Hoja de datos )

Número de pieza	ADC122S706
Descripción	Dual 12-Bit - 500 kSPS to 1 MSPS - Simultaneous Sampling A/D Converter
Fabricantes	National Semiconductor
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No Preview Available ! November 16, 2007 www.DataSheet4U.com ADC122S706 Dual 12-Bit, 500 kSPS to 1 MSPS, Simultaneous Sampling A/D Converter General Description The ADC122S706 is a dual 12-bit, 500 kSPS to 1 MSPS si- multaneous sampling Analog-to-Digital (A/D) converter. The analog inputs on both channels are sampled simultaneously to preserve their relative phase information to each other. The converter is based on a successive-approximation register architecture where the differential nature of the analog inputs is maintained from the internal track-and-hold circuits throughout the A/D converter to provide excellent common- mode signal rejection. The ADC122S706 features an external reference that can be varied from 1.0V to VA. The ADC122S706 offers dual high-speed serial data outputs that are binary 2's complement and are compatible with sev- eral standards, such as SPI™, QSPI™, MICROWIRE™, and many common DSP serial interfaces. Channel A's conversion result is outputted on DOUTA while Channel B's conversion re- sult is outputted on DOUTB. This feature makes the AD- C122S706 an excellent replacement for systems using two distinct ADCs in a simultaneous sampling application. The serial clock (SCLK) and chip select bar (CS) are shared by both channels. For lower power consumption, a single serial data output mode is externally selectable. The ADC122S706 may be operated with independent analog (VA) and digital (VD) supplies. VA can range from 4.5V to 5.5V and VD can range from 2.7V to VA. With the ADC122S706 operating with a VA of 5V and a VD of 3V, the power con- sumption at 1 MSPS is typically 25 mW. Operating in power- down mode, the power consumption of the ADC122S706 decreases to 3 µW. The differential input, low power con- sumption, and small size make the ADC122S706 ideal for direct connection to sensors in motor control applications. Operation is guaranteed over the industrial temperature range of −40°C to +105°C and clock rates of 8 MHz to 16 MHz. The ADC122S706 is available in a 14-lead TSSOP package. Features ■ True Simultaneous Sampling Differential Inputs ■ Guaranteed performance from 500 kSPS to 1 MSPS ■ External Reference ■ Wide Input Common-Mode Voltage Range ■ Single or Dual High-Speed Serial Data Outputs ■ Operating Temperature Range of −40°C to +105°C ■ SPI™/QSPI™/MICROWIRE™/DSP compatible Serial Interface Key Specifications ■ Conversion Rate 500 kSPS to 1 MSPS ■ INL ±1 LSB (max) ■ DNL ±0.95 LSB (max) ■ SNR 71 dBc (min) ■ THD -72 dBc (min) ■ ENOB 11.25 bits (min) ■ Power Consumption at 1 MSPS ■— — — Converting, VA = 5V, VD = 3V Converting, VA = 5V, VD = 5V Power-Down 20 mW (typ) 25 mW (typ) 3 µW (typ) Applications ■ Motor Control ■ Power Meters/Monitors ■ Multi-Axis Positioning Systems ■ Instrumentation and Control Systems ■ Data Acquisition Systems ■ Medical Instruments ■ Direct Sensor Interface Connection Diagram TRI-STATE® is a trademark of National Semiconductor Corporation. MICROWIRE™ is a trademark of National Semiconductor Corporation. QSPI™ and SPI™ are trademarks of Motorola, Inc. © 2007 National Semiconductor Corporation 300171 30017105 www.national.com 1 page Symbol Parameter CMRR Common Mode Rejection Ratio VREF Reference Voltage Range DIGITAL INPUT CHARACTERISTICS VIH Input High Voltage VIL Input Low Voltage IIN Input Current (Note 11) CIND Input Capacitance DIGITAL OUTPUT CHARACTERISTICS VOH Output High Voltage VOL Output Low Voltage IOZH, IOZL COUT TRI-STATE Leakage Current TRI-STATE Output Capacitance Output Coding POWER SUPPLY CHARACTERISTICS VA Analog Supply Voltage VD Digital Supply Voltage Analog Supply Current, Continuously Converting (Dual Data Output Mode) IVA (Conv) Analog Supply Current, Continuously Converting (Single Data Output Mode) Digital Supply Current, Continuously Converting (Dual Data Output Mode) IVD (Conv) Digital Supply Current, Continuously Converting (Single Data Output Mode) IVREF (Conv) Reference Current, Continuously Converting (Dual Data Output Mode) Reference Current, Continuously Converting (Single Data Output Mode) IVA (PD) Analog Supply Current, Power Down Mode (CS high) IVD (PD) Digital Supply Current, Power Down Mode (CS high) IVREF (PD) Reference Current, Power Down Mode (CS high) Conditions See the Specification Definitions for the test condition VIN = 0V or VA ISOURCE = 200 µA ISOURCE = 1 mA ISINK = 200 µA ISINK = 1 mA Force 0V or VA Force 0V or VA fSCLK = 16 MHz, fS = 1 MSPS, fIN = 100 kHz, VA = 5V, DUAL = VD fSCLK = 16 MHz, fS = 500 kSPS, fIN = 100 kHz, VA = 5V, DUAL = 0V fSCLK = 16 MHz, fS = 1 MSPS, fIN = 100 kHz, VD = 5V, DUAL = 5V fSCLK = 16 MHz, fS = 1 MSPS, fIN = 100 kHz, VD = 3V, DUAL = 3V fSCLK = 16 MHz, fS = 500 kSPS, fIN = 100 kHz, VD = 5V, DUAL = 0V fSCLK = 16 MHz, fS = 500 kSPS, fIN = 100 kHz, VD = 3V, DUAL = 0V fSCLK = 16 MHz, fS = 1 MSPS, VREF = 2.5V, DUAL = VD fSCLK = 16 MHz, fS = 500 kSPS, VREF = 2.5V, DUAL = 0V fSCLK = 16 MHz, VA = 5.0V fSCLK = 0, VA = 5.0V (Note 8) fSCLK = 16 MHz, VD = 5.0V fSCLK = 0 (Note 8) fSCLK = 16 MHz fSCLK = 0 (Note 8) Typical −90 2 Units Liwmwitsw.DataS(Nheoetet47U) .com dB 1.0 V (min) VA V (max) 2.4 V (min) 0.8 V (max) ±1 µA (max) 4 pF (max) VD − 0.02 VD − 0.09 0.01 VD − 0.2 0.4 V (min) V V (max) 0.08 V ±1 µA (max) 2 4 pF (max) Binary 2'S Complement 4.5 V (min) 5.5 V (max) 2.7 V (min) VA V (max) 3.3 4.2 mA (max) 1.8 2.9 mA (max) 1.7 2.0 mA (max) 1.0 1.3 mA (max) 0.9 1.2 mA (max) 0.6 0.7 mA (max) 90 105 µA (max) 45 10 0.5 10 0.1 0.05 0.05 60 µA (max) µA 1 µA (max) µA 0.2 µA (max) µA 0.1 µA (max) 5 www.national.com 5 Page Typical Performance Characteristics VA fSCLK = 16 MHz, DUAL = VD, fIN = 100 kHz unless otherwise stated. = VD = 5.0V, VREF = 2.5V, TA = +25°C, fSwAMwPwLE.D=a1taMSShePeSt,4U.com DNL - 1 MSPS INL - 1 MSPS DNL vs. VA 30017121 INL vs. VA 30017122 DNL vs. VREF 30017123 INL vs. VREF 30017124 30017118 11 30017119 www.national.com 11 Page

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