S/(N + D) (dB) LTC1282 3V 140ksps 12-Bit Sampling A/D Converter with Reference FEATURES DESCRIPTION n Single Supply 3V or 3V Operation The LTC 1282 is a 6s, 140ksps, sampling 12-bit A/D n 140ksps Throughput Rate converter that draws only 12mW from a single 3V or dual n 12mW (Typ) Power Dissipation 3V supply. This easy-to-use device comes complete with n On-Chip 25ppm/C Reference 1.14s sample-and-hold, precision reference and inter- n Internal Synchronized Clock No Clock Required nally trimmed clock. Unipolar and bipolar conversion n High Impedance Analog Input modes provide flexibility for various applications. They are n 69dB S/(N + D) and 77dB THD at Nyquist built with LTBiCMOSTM switched capacitor technology. n 0.5LSB INL and 0.75LSB DNL Max (A Grade) The LTC1282 has a 25ppm/C (max) internal reference n 2.7V Guaranteed Minimum Supply Voltage and converts 0V to 2.5V unipolar inputs from a single n ESD Protected On All Pins 3V supply. With 3V supplies its input range is 1.25V n 24-Pin SW Package with twos complement output format. Maximum DC n 0V to 2.5V or 1.25V Input Ranges specifications include 0.5LSB INL, 0.75LSB DNL and 25ppm/C full-scale drift over temperature. Outstanding APPLICATIONS AC performance includes 69dB S/(N + D) and 77dB THD at the Nyquist input frequency of 70kHz. n 3V Powered Systems n High Speed Data Acquisition The internal clock is trimmed for 6s maximum conver- n Digital Signal Processing sion time. The clock automatically synchronizes to each n Multiplexed Data Acquisition Systems sample command eliminating problems with asynchro- n Audio and Telecom Processing nous clock noise found in competitive devices. A high n Spectrum Analysis speed parallel interface eases connections to FIFOs, DSPs and microprocessors. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Single 3V Supply, 140ksps, 12-Bit Sampling A/D Converter Effective Bits and Signal-to-(Noise + Distortion) vs Input Frequency LTC1282 3V 12 74 1 24 ANALOG INPUT A V IN DD 1.20V (0V TO 2.5V) 11 68 2 23 + V V 0.1F V REF REF SS 10F 10 62 + 3 22 OUTPUT 0.1F AGND BUSY NYQUIST 10F 9 56 4 21 FREQUENCY D11(MSB) CS P CONTROL 8 50 5 20 LINES D10 RD 7 6 19 D9 HBEN 6 7 18 D8 NC 5 8 17 D7 NC 4 9 16 D6 D0/8 3 10 15 8- OR 12-BIT D5 D1/9 PARALLEL BUS 2 11 14 D4 D2/10 1 12 13 f = 140kHz SAMPLE DGND D3/11 0 1k 10k 100k INPUT FREQUENCY (Hz) LTC1282 TA02 1282 TA01 Rev. B 1 Document Feedback For more information www.analog.com ENOBs (EFFECTIVE NUMBER OF BITS)LTC1282 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1 and 2) TOP VIEW Supply Voltage (V ) ................................................12V DD A 1 24 V IN DD Negative Supply Voltage (V ) ..................... 6V to GND SS V 2 23 V REF SS Total Supply Voltage (V to V ) ............................12V DD SS AGND 3 22 BUSY D11 (MSB) 4 21 CS Analog Input Voltage D10 5 20 RD (Note 3) .............................. V 0.3V to V + 0.3V SS DD D9 6 19 HBEN Digital Input Voltage (Note 4) ..............V 0.3V to 12V SS D8 7 18 NC Digital Output Voltage D7 8 17 NC D6 9 16 D0/8 (Note 3) .............................. V 0.3V to V + 0.3V SS DD D5 10 15 D1/9 Power Dissipation .............................................. 500mW D4 11 14 D2/10 Specified Temperature Range (Note 14) ....... 0C to 70C DGND 12 13 D3/11 Operating Temperature Range SW PACKAGE 24-LEAD PLASTIC SO WIDE LTC1282AC, LTC1282BC .......................... 0C to 70C T = 110C, = 130C/W JMAX JA Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1282ACSW PBF LTC1282ACSW TRPBF LTC1282ACSW 24-Lead Plastic SO Wide 0C to 70C LTC1282BCSW PBF LTC1282BCSW TRPBF LTC1282BCSW 24-Lead Plastic SO Wide 0C to 70C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. CONVERTER CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. With Internal Reference (Notes 5 and 6) A LTC1282A LTC1282B PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Resolution (No Missing Codes) l 12 12 Bits l Integral Linearity Error (Note 7) 1/2 1 LSB l Commercial 1/2 1 LSB Military 3/4 1 LSB Differential Linearity Error Commercial l 3/4 1 LSB Military l 1 1 LSB l Offset Error (Note 8) 3 4 LSB 4 6 LSB Gain Error 10 15 LSB Gain Error Tempco I = 0 l 5 25 10 45 ppm/C OUT(REF) Power Supply Rejection (Note 9) V 10% 0.3 0.3 LSB DD (Note 10) V 10% 0.1 0.1 LSB SS Rev. B 2 For more information www.analog.com