LTC1850/LTC1851 8-Channel, 10-Bit/12-Bit, 1.25Msps Sampling ADCs FEATURES DESCRIPTIO n Flexible 8-Channel Multiplexer The 10-bit LTC 1850 and 12-bit LTC1851 are complete n Single-Ended or Differential Inputs 8-channel data acquisition systems. They include a flex- n Two Gain Ranges Plus Unipolar and Bipolar ible 8-channel multiplexer, a 1.25Msps successive approxi- Operation mation analog-to-digital converter with sample-and-hold, n 1.25Msps Sampling Rate an internal 2.5V reference and reference buffer amplifier, n Single 5V Supply and 40mW Power Dissipation and a parallel output interface. The multiplexer can be con- n Scan Mode and Programmable Sequencer figured for single-ended or differential inputs, two gain n Pin Compatible 10-Bit LTC1850 and 12-Bit LTC1851 ranges and unipolar or bipolar operation. n True Differential Inputs Reject Common Mode Noise The ADCs have a scan mode that will repeatedly cycle n Internal 2.5V Reference through all 8 multiplexer channels and can also be n Parallel Output Includes MUX Address programmed with a sequence of up to 16 addresses and n Easy Interface to 3V Logic configurations that can be scanned in succession. The n Nap and Sleep Shutdown Modes sequence memory can also be read back. The reference U and buffer amplifier provide pin strappable ranges of APPLICATIO S 4.096V, 2.5V and 2.048V. The parallel output includes n High Speed Data Acquisition the 10-bit or 12-bit conversion result plus the 4-bit n Test and Measurement multiplexer address. The digital outputs are powered n Imaging Systems from a separate supply allowing for easy interface to 3V n Telecommunications digital logic. Typical power consumption is 40mW at n Industrial Process Control 1.25Msps from a single 5V supply. n , LTC and LT are registered trademarks of Linear Technology Corporation. Spectrum Analysis BLOCK DIAGRA LTC1851 M1 CH0 SHDN CS CH1 CONVST RD CONTROL LOGIC WR CH2 AND DIFF Integral Linearity, LTC1851 PROGRAMMABLE A2 SEQUENCER CH3 A1 1.00 A0 8-CHANNEL INTERNAL CH4 UNI/BIP MULTIPLEXER CLOCK PGA M0 0.50 CH5 OV DD CH6 BUSY DIFF /S6 0.00 OUT CH7 A2 /S5 OUT A1 /S4 OUT A0 /S3 OUT COM D11/S2 0.50 D10/S1 2.5V D9/S0 REFOUT 12-BIT DATA OUTPUT D8 REFERENCE 1.25Msps ADC LATCHES DRIVERS D7 1.00 D6 0 512 1024 1536 2048 2560 3072 3584 4096 D5 CODE D4 LTC1850/51 G01 D3 REFIN REF AMP D2 D1 D0 OGND REFCOMP 1851 BD 18501f 1 INL COC ERROR (LSBs) W ULTC1850/LTC1851 O OV = V (Notes 1, 2) ABS LUTEXAI U RATI GS DD DD Supply Voltage (V ) ................................................. 6V Ambient Operating Temperature Range DD Analog Input Voltage (Note 3) ..... 0.3V to (V + 0.3V) LTC1850C/LTC1851C ............................ 0 C to 70 C DD Digital Input Voltage (Note 4) ....................0.3V to 10V LTC1850I/LTC1851I .......................... 40 C to 85 C Digital Output Voltage .................. 0.3V to (V + 0.3V) Storage Temperature Range ................. 65 C to 150 C DD Power Dissipation.............................................. 500mW Lead Temperature (Soldering, 10 sec)................ 300 C PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW ORDER PART ORDER PART NUMBER NUMBER 1 48 M1 1 48 M1 CH0 CH0 2 47 SHDN 2 47 SHDN CH1 CH1 LTC1850CFW LTC1851CFW 3 46 CS 3 46 CS CH2 CH2 LTC1850IFW LTC1851IFW 4 45 CONVST 4 45 CONVST CH3 CH3 5 44 RD 5 44 RD CH4 CH4 6 43 WR 6 43 WR CH5 CH5 7 42 DIFF 7 42 DIFF CH6 CH6 8 41 A2 8 41 A2 CH7 CH7 9 40 A1 9 40 A1 COM COM 10 39 A0 10 39 A0 REFOUT REFOUT REFIN 11 38 UNI/BIP REFIN 11 38 UNI/BIP REFCOMP 12 37 PGA REFCOMP 12 37 PGA GND 13 36 M0 GND 13 36 M0 V 14 35 OV V 14 35 OV DD DD DD DD 15 34 OGND 15 34 OGND V V DD DD 16 33 BUSY 16 33 BUSY GND GND 17 32 NC 17 32 D0 DIFF /S6 DIFF /S6 OUT OUT 18 31 NC 18 31 D1 A2 /S5 A2 /S5 OUT OUT A1 /S4 19 30 D0 A1 /S4 19 30 D2 OUT OUT A0 /S3 20 29 D1 A0 /S3 20 29 D3 OUT OUT D9/S2 21 28 D2 D11/S2 21 28 D4 D8/S1 22 27 D3 D10/S1 22 27 D5 D7/S0 23 26 D4 D9/S0 23 26 D6 D6 24 25 D5 D8 24 25 D7 FW PACKAGE FW PACKAGE 48-LEAD PLASTIC TSSOP 48-LEAD PLASTIC TSSOP T = 150 C, q = 110 C/W T = 150 C, q = 110 C/W JMAX JA JMAX JA Consult LTC Marketing for parts specified with wider operating temperature ranges. 18501f 2 U WU U W W W