PDF ADC1175CIMTCX Data sheet ( Hoja de datos )

Número de pieza	ADC1175CIMTCX
Descripción	8-Bit/ 20MHz/ 60mW A/D Converter
Fabricantes	National Semiconductor
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No Preview Available ! January 2000 ADC1175 8-Bit, 20MHz, 60mW A/D Converter General Description The ADC1175 is a low power, 20 Msps analog-to-digital con- verter that digitizes signals to 8 bits while consuming just 60 mW of power (typ). The ADC1175 uses a unique architecture that achieves 7.5 Effective Bits. Output formatting is straight binary coding. The excellent DC and AC characteristics of this device, to- gether with its low power consumption and +5V single supply operation, make it ideally suited for many video, imaging and communications applications, including use in portable equipment. Furthermore, the ADC1175 is resistant to latchup and the outputs are short-circuit proof. The top and bottom of the ADC1175’s reference ladder is available for connections, enabling a wide range of input possibilities. The ADC1175 is offered in SOIC (EIAJ) and TSSOP. It is de- signed to operate over the commercial temperature range of -20˚C to +75˚C. Features n Internal Sample-and-Hold Function n Single +5V Operation n Internal Reference Bias Resistors n Industry Standard Pinout n TRI-STATE® Outputs Key Specifications n Resolution 8 Bits n Maximum Sampling Frequency 20 Msps (min) n THD −55 dB (typ) n DNL 0.75 LSB (max) n ENOB 7.5 Bits (typ) n Guaranteed No Missing Codes n Differential Phase 0.5 Degree (typ) n Differential Gain 0.7% (typ) n Power Consumption 60mW (typ) (excluding reference current) Applications n Video Digitization n Digital Still Cameras n Set Top Boxes n Communications n Medical Imaging n Personal Computer Video Cameras n Digital Television n CCD Imaging n Electro-Optics Ordering Information ADC1175CIJM ADC1175CIJMX ADC1175CIMTC ADC1175CIMTCX SOIC (EIAJ) SOIC (EIAJ) (tape & reel) TSSOP TSSOP (tape & reel) Pin Configuration ADC1175 Pin Configuration TRI-STATE® is a registered trademark of National Semiconductor Corporation. CN © 2000 National Semiconductor Corporation DS100092 DS100092-1 www.national.com 1 page Converter Electrical Characteristics (Continued) The fCLK following specifications apply = 20MHz at 50% duty cycle. for AVDD = DVDD = +5.0VDC, Boldface limits apply for TA OE = 0V, = TMIN to VRT = TMAX; +2.6V, VRB = all other limits 0.6V, TA = CL = 25˚C 20 pF, (Notes 7, 8) Symbol Parameter Conditions Typical Limits (Note 9) (Note 9) Units Analog Input and Reference Characteristics VRB VRTS - VRBS VRT - VRB Reference Bottom Self Bias Voltage Self Bias Voltage Delta Reference Voltage Delta VRT connected to VRTS VRB connected to VRBS VRT connected to VRTS, VRB connected to VRBS VRT connected to VRTS, VRB connected to VSS 0.55 V(min) 0.6 0.65 V(max) 2 1.89 µAmin 2.15 µAmax 2.3 V 1.0 V(min) 2 2.8 V(max) Power Supply Characteristics IADD IDDD Analog Supply Current Digital Supply Current IAVDD + IDVDD Total Operating Current DVDD = AVDD =5.25V DVDD = AVDD =5.25V DVDD AVDD =5.25V, fCLK = 20 MHz DVDD AVDD =5.25V, fCLK = 30 MHz DVDD = AVDD =5.25V, CLK Low (Note 10) 9.5 2.5 12 17 13 9.6 mA mA mA mA Power Consumption CLK, OE Digital Input Characteristics DVDD = AVDD =5.25V, fCLK = 20 MHz DVDD = AVDD =5.25V, fCLK = 30 MHz 60 85 65 mW mW VIH Logical High Input Voltage VIL Logical Low Input Voltage IIH Logical High Input Current IIL Logic Low Input Current CIN Logic Input Capacitance Digital Output Characteristics DVDD = AVDD = +5.25V DVDD = AVDD = +5.25V VIH = DVDD = AVDD = +5.25V VIL = 0V, DVDD = AVDD = +5.25V 3.0 V (min) 1.0 V (max) 5 µA −5 µA 5 pF IOH High Level Output Current IOL Low Level Output Current IOZH, IOZL Tri-State®Leakage Current AC Electrical Characteristics DVDD = 4.75V, VOH = 2.4V DVDD = 4.75V, VOL = 0.4V DVDD = 5.25V OE = DVDD, VOL = 0V or VOH = DVDD −1.1 1.6 mA (min) mA (max) ±20 µA fC1 Maximum Conversion Rate fC2 Minimum Conversion Rate tOD Output Delay CLK high to data valid Pipline Delay (Latency) 30 20 MHz(min) 1 MHz 19 ns(max) 2.5 Clock Cycles tDS tAJ tOH tEN tDIS ENOB SINAD Sampling (Aperture) Delay Aperture Jitter Output Hold Time OE Low to Data Valid OE High to High Z State Effective Number of Bits Signal-to- Noise & Distortion CLK low to acquissition of data CLK high to data invalid Loaded as in Figure 2 Loaded as in Figure 2 fIN = 1.31 MHz, VIN = FS - 2 LSB fIN = 4.43 MHz, VIN = FS - 2 LSB fIN = 9.9 MHz, VIN = FS - 2 LSB fIN = 4.43 MHz, fCLK = 30 MHz fIN = 1.31 MHz, VIN = FS - 2 LSB fIN = 4.43 MHz, VIN = FS - 2 LSB fIN = 9.9 MHz, VIN = FS - 2 LSB fIN = 4.43 MHz, fCLK = 30 MHz 3 ns 30 ps rms 10 ns 11 ns 15 ns 7.5 7.3 7.2 7.0 Bits (min) 6.5 47 46 45 43 dB(min) 40 5 www.national.com 5 Page Applications Information (Continued) DS100092-13 FIGURE 3. Simple, Low Component Count, Self -Bias Reference application. Because of resistor tolerances, the reference voltages can vary by as much as 6%. Choose an amplifier that can drive a dynamic capacitance (see text). 11 www.national.com 11 Page

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