SIGNAL/(NOISE + DISTORTION) (dB) LTC1415 12-Bit, 1.25Msps, 55mW Sampling A/D Converter DESCRIPTIO FEATURES n 1.25Msps Sample Rate The LTC 1415 is a 700ns, 1.25Msps, 12-bit sampling n Single 5V Supply A/D converter that draws only 55mW from a single 5V n Power Dissipation: 55mW supply. This easy-to-use device includes a high dynamic n Nap and Sleep Power Shutdown Modes range sample-and-hold, precision reference and a trimmed n 0.35LSB INL and 0.25LSB DNL internal clock. Two power shutdown modes provide flex- n 72dB S/(N + D) and 80dB THD at 100kHz ibility for low power systems. n External or Internal Reference Operation The LTC1415s full-scale input range is 4.096V. Low n True Differential Inputs Reject Common Mode Noise linearity errors 0.35LSB INL, 0.25LSB DNL make it n Input Range: 4.096V (1mV/LSB) ideal for imaging systems. Outstanding AC performance n 28-Pin SSOP and SO Packages includes 72dB S/(N + D) and 80dB THD with an input frequency of 100kHz. APPLICATI S The unique differential input sample-and-hold can acquire single-ended or differential input signals up to its 18MHz n High Speed Data Acquisition bandwidth. The 60dB common mode rejection allows n Imaging Systems users to eliminate ground loops and common mode noise n Digital Signal Processing by measuring signals differentially from the source. n Multiplexed Data Acquisition Systems n Telecommunications The ADC has a m P compatible, 12-bit parallel output port. There is no pipeline delay in the conversion results. A separate convert start input and data ready signal (BUSY) ease connections to FIFOs, DSPs and microprocessors. A separate output logic supply pin allows direct connection , LTC and LT are registered trademarks of Linear Technology Corporation. to 3V components. TYPICAL APPLICATI 1.25MHz, 12-Bit Sampling A/D Converter Effective Bits and Signal-to-(Noise + Distortion) LTC1415 vs Input Frequency 5V DIFFERENTIAL 1 28 ANALOG INPUT +A AV 12 74 IN DD 2 27 (0V TO 4.096V) 11 68 A DV IN DD 10m F 3 26 OUTPUT LOGIC 2.50V NYQUIST 10 62 V OV REF DD V OUTPUT SUPPLY 3V OR 5V REF 4 25 FREQUENCY 9 56 REFCOMP BUSY 5 24 8 AGND CS 10m F 6 23 7 D11(MSB) CONVST m P CONTROL 7 22 LINES 6 D10 RD 8 21 5 D9 SHDN 9 20 4 D8 NAP/SLP 10 19 3 D7 OGND 12-BIT 11 18 2 D6 D0 PARALLEL 12 17 1 BUS D5 D1 f = 1.25Msps SAMPLE 13 16 0 D4 D2 14 15 1k 10k 100k 1M 2M DGND D3 INPUT FREQUENCY (Hz) LTC1415 TA02 1415 TA01 1 EFFECTIVE BITS O U UO ULTC1415 ABSOLUTEXAI U RATI GS PACKAGE/ORDER I FOR ATIO AV = DV =OV = V (Notes 1, 2) DD DD DD DD TOP VIEW ORDER Supply Voltage (V ) ................................................ 6V DD +A 1 28 AV IN DD PART NUMBER Analog Input Voltage (Note 3) ...... 0.3V to V + 0.3V DD A 2 27 DV IN DD Digital Input Voltage (Note 4) .................. 0.3V to 12V V 3 26 OV LTC1415CG REF DD Digital Output Voltage .................... 0.3V to V + 0.3V REFCOMP 4 25 BUSY LTC1415CSW DD AGND 5 24 CS Power Dissipation............................................. 500mW LTC1415IG D11 (MSB) 6 23 CONVST Operating Temperature Range LTC1415ISW D10 7 22 RD LTC1415C .............................................. 0 C to 70 C D9 8 21 SHDN LTC1415I........................................... 40 C to 85 C D8 9 20 NAP/SLP Storage Temperature Range ................ 65 C to 150 C D7 10 19 OGND Lead Temperature (Soldering, 10 sec)................. 300 C D6 11 18 D0 D5 12 17 D1 D4 13 16 D2 DGND 14 15 D3 G PACKAGE SW PACKAGE 28-LEAD PLASTIC SSOP 28-LEAD PLASTIC SO WIDE T = 110 C, q = 95 C/W (G) JMAX JA T = 110 C, q = 130 C/W (SW) JMAX JA Consult factory for Military grade parts. 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 0.35 1 LSB Differential Linearity Error l 0.25 1 LSB Offset Error (Note 8) 1 6 LSB l 8 LSB Full-Scale Error 20 LSB Full-Scale Tempco I = 0 15 ppm/ C OUT(REF) (Note 5) A ALOG I PUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Analog Input Range (Note 9) 4.75V V 5.25V l 4.096 V IN DD I Analog Input Leakage Current CS = High l 1 m A IN C Analog Input Capacitance Between Conversions 19 pF IN During Conversions 5 pF t Sample-and-Hold Acquisition Time l 50 150 ns ACQ t Sample-and-Hold Aperture Delay Time 1.5 ns AP t Sample-and-Hold Aperture Delay Time Jitter 2 ps jitter RMS CMRR Analog Input Common Mode Rejection Ratio 0V < V < V , DC to MHz 60 dB CM DD 2 U U U U WU U W W W