SIGNAL/(NOISE + DISTORTION) (dB) LTC1279 12-Bit, 600ksps Sampling A/D Converter with Shutdown DESCRIPTIO FEATURES n Single Supply 5V or 5V Operation The LTC 1279 is a 1.4s, 600ksps, sampling 12-bit A/D n Sample Rate: 600ksps converter which draws only 60mW from a single 5V or n 70dB S/(N + D) and 74dB THD at Nyquist 5V supplies. This easy-to-use device comes complete n Power Dissipation: 60mW Typ with a 160ns sample-and-hold, a precision reference and n Power Shutdown with Instant Wake-Up an internally trimmed clock. Unipolar and bipolar conver- n Internal Reference Can Be Overdriven Externally sion modes add to the flexibility of the ADC. The low n Internal Synchronized Clock No Clock Required power dissipation is reduced even more, drawing only n High Impedance Analog Input 8.5mW in power shutdown mode. Instant wake-up from n Input Range: 0V to 5V or 2.5V power shutdown allows the converter to be powered n New Flexible, Friendly Parallel Interface Eases down even during brief inactive periods. Connections to DSPs and FIFOs The LTC1279 converts 0V to 5V unipolar inputs from a n 24-Pin SO Wide Package single 5V supply and 2.5V bipolar inputs from 5V supplies. Maximum DC specs include 1LSB INL and APPLICATI S 1LSB DNL. Outstanding guaranteed AC performance includes 70dB S/(N+D) and 78dB THD at the input n High Speed Data Acquisition frequency of 100kHz over temperature. n Digital Signal Processing n Multiplexed Data Acquisition Systems The internal clock is trimmed for 1.4s conversion time. n Audio and Telecom Processing The clock automatically synchronizes to each sample n Spectrum Analysis command, eliminating problems with asynchronous clock noise found in competitive devices. A separate conversion start input and a data-ready signal (BUSY) ease connec- tions to FIFOs, DSPs and microprocessors. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATI Single 5V Supply, 600kHz, 12-Bit Sampling A/D Converter Effective Bits and Signal-to-(Noise + Distortion) vs Input Frequency 5V LTC1279 12 74 1 24 ANALOG INPUT A AV IN DD 11 68 2.42V (0V TO 5V) + 2 23 REFERENCE V V 0.1F REF SS 10F 10 62 NYQUIST + 3 22 OUTPUT AGND BUSY FREQUENCY 0.1F 9 56 10F 4 21 P CONTROL D11(MSB) CS 8 50 5 20 LINES D10 RD 7 6 19 CONVERSION-START INPUT D9 CONVST 6 7 18 D8 SHDN POWER SHUTDOWN INPUT 5 8 17 D7 DV DD 4 9 16 12-BIT D6 D0 3 PARALLEL 10 15 D5 D1 BUS 2 11 14 D4 D2 1 f = 600kHz SAMPLE 12 13 DGND D3 0 10k 100k 1M 5M FREQUENCY (Hz) LTC1279 TA01 1279 G03 1 EFFECTIVE NUMBER OF BITS UO O U ULTC1279 ABSOLUTEXAI U RATI GS PACKAGE/ORDER I FOR ATIO AV = DV = V (Notes 1, 2) DD DD DD ORDER TOP VIEW Supply Voltage (V ) ................................................ 7V DD PART NUMBER* A 1 24 AV IN DD Negative Supply Voltage (V ) SS V 2 23 V REF SS Bipolar Operation Only ......................... 6V to GND AGND 3 22 BUSY LTC1279CSW Total Supply Voltage (V to V ) DD SS D11 (MSB) 4 21 CS LTC1279ISW Bipolar Operation Only ....................................... 12V D10 5 20 RD D9 6 19 CONVST Analog Input Voltage (Note 3) D8 7 18 SHDN Unipolar Operation ................... 0.3V to V + 0.3V DD D7 8 17 DV DD Bipolar Operation............... V 0.3V to V + 0.3V SS DD D6 9 16 D0 D5 10 15 D1 Digital Input Voltage (Note 4) D4 11 14 D2 Unipolar Operation ............................... 0.3V to 12V DGND 12 13 D3 Bipolar Operation.......................... V 0.3V to 12V SS SW PACKAGE Digital Output Voltage 24-LEAD PLASTIC SO WIDE Unipolar Operation ................... 0.3V to V + 0.3V DD T = 110C, = 130C/W JMAX JA Bipolar Operation..................... 0.3V to V + 0.3V DD Power Dissipation ............................................. 500mW *Consult factory for plastic DIP package. Consult factory for Military grade parts. Operating Temperature Range LTC1279C............................................... 0C to 70C LTC1279I ........................................... 40C to 85C Storage Temperature Range ................ 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C With Internal Reference (Notes 5, 6) CO VERTER CCHARA TERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Resolution (No Missing Codes) l 12 Bits Integral Linearity Error (Note 7) l 1 LSB Differential Linearity Error l 1 LSB Bipolar Offset Error (Note 8) 4 LSB l 6 LSB Unipolar Offset Error 6 LSB l 8 LSB Gain Error 15 LSB Gain Error Tempco I = 0 l 10 45 ppm/C OUT(REF) (Note 5) A ALOG I PUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Analog Input Range (Note 9) 4.95V V 5.25V (Unipolar) l 0 to 5 V IN DD 4.75V V 5.25V, 5.25V V 2.45V (Bipolar) l 2.5 V DD SS I Analog Input Leakage Current CS = High l 1 A IN C Analog Input Capacitance Between Conversions (Sample Mode) 25 pF IN During Conversions (Hold Mode) 5 pF 2 U U U U WU U W W W