MAX1144/MAX1145 19-2465 Rev 0 4/02 14-Bit ADCs, 150ksps, 3.3V Single Supply General Description Features The MAX1144/MAX1145 are 150ksps, 14-bit ADCs. 150ksps (Bipolar) and 125ksps (Unipolar) These serially interfaced ADCs connect directly to Sampling ADC SPI, QSPI, and MICROWIRE devices without 14 Bits, No Missing Codes external logic. They combine an input scaling network, 1LSB INL Guaranteed internal track/hold, clock, and three general-purpose digital output pins (for external multiplexer or PGA con- -100dB THD trol) in a 20-pin SSOP package. The excellent dynamic 3.3V Single-Supply Operation performance (THD 90dB), high speed (150ksps in Low-Power Operation bipolar mode), and low power (8.0mA) of these ADCs 5mA typ (Unipolar Mode) make them ideal for applications such as industrial 1.2A Shutdown Mode process control, instrumentation, and medical applica- tions. Software-Configurable Unipolar and Bipolar Input The MAX1144 accepts input signals of 0 to +6V (unipo- Ranges lar) or 6V (bipolar), while the MAX1145 accepts input 0 to +6V and 6V (MAX1144) signals of 0 to +2.048V (unipolar) or 2.048V (bipolar). 0 to +2.048V and 2.048V (MAX1145) Operating from a single 3.135V to 3.465V analog digital Internal or External Clock supply, powerdown modes reduce current consump- SPI/QSPI/MICROWIRE TMS320-Compatible Serial tion to 0.15mA at 10ksps and further reduce supply Interface current to less than 20A slower data rates. Three User-Programmable Logic Outputs A serial strobe output (SSTRB) allows direct connection Small 20-Pin SSOP Package to the TMS320 family digital-signal processors. The MAX1144/MAX1145 user can select either the internal Ordering Information clock or an external serial-interface clock for the ADC to perform analog-to-digital conversions. TEMP PIN- INL PART The MAX1144/MAX1145 feature internal calibration cir- RANGE PACKAGE (LSB) cuitry to correct linearity and offset errors. On-demand MAX1144ACAP 0C to +70C 20 SSOP 1 calibration allows the user to optimize performance. MAX1144BCAP 0C to +70C 20 SSOP 2 Three user-programmable logic outputs are provided for the control of an 8-channel mux or PGA. MAX1144AEAP -40C to +85C 20 SSOP 1 MAX1144BEAP -40C to +85C 20 SSOP 2 The MAX1144/MAX1145 are available in a 20-pin SSOP package and are fully specified over the -40C to Ordering Information continued at end of data sheet. +85C temperature range. Pin Configuration Applications Industrial Process Control TOP VIEW Industrial I/O Modules REF 1 20 AIN Data-Acquisition Systems AV 2 19 AGND DD Medical Instruments AGND 3 18 CREF AV 4 17 CS Portable and Battery-Powered Equipment DD MAX1144 DGND 5 16 DIN MAX1145 SHDN 6 15 DV DD Functional Diagram and Typical Application Circuit appear P2 7 14 DGND at end of data sheet. P1 8 13 SCLK PO 9 12 RST SPI and QSPI are trademarks of Motorola, Inc. SSTRB 10 11 DOUT MICROWIRE is a trademark of National Semiconductor, Corp. SSOP Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.14-Bit ADCs, 150ksps, 3.3V Single Supply ABSOLUTE MAXIMUM RATINGS AV to AGND, DV to DGND ..............................-0.3V to +6V Operating Temperature Ranges DD DD AGND to DGND.....................................................-0.3V to +0.3V MAX114 CAP...................................................0C to +70C AIN to AGND ....................................................................16.5V MAX114 EAP................................................-40C to +85C CREF, REF to AGND................................-0.3V to (AV + 0.3V) Storage Temperature Range .............................-60C to +150C DD Digital Inputs to DGND.............................................-0.3V to +6V Junction Temperature......................................................+150C Digital Outputs to DGND .........................-0.3V to (DV + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD Continuous Power Dissipation (T = +70C) A 20-Pin SSOP (derate 8.00mW/C above +70C) .........640mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (AV = DV = 3.3V 5%, f = 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps), bipolar input, V = DD DD SCLK REF 2.048V, C = 4.7F, C = 1F, T = T to T , unless otherwise noted. Typical values are at T = +25C.) REF CREF A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 14 Bits MAX114 A 1 Relative Accuracy INL Bipolar mode (Note 2) LSB MAX114 B 2 No Missing Codes 14 Bits MAX114 A -1 +1 Differential Nonlinearity DNL Bipolar mode LSB MAX114 B -1.00 +1.75 LSB Transition Noise 0.47 RMS Unipolar 4 Offset Error mV Bipolar 6 Unipolar 0.2 Gain Error (Note 3) %FSR Bipolar 0.3 Offset Drift (Bipolar and Unipolar) Excluding reference drift 1 ppm/C Gain Drift (Bipolar and Unipolar) Excluding reference drift 4 ppm/C D YNAM IC SPECIF IC A T ION S (5 k Hz SINE-WA VE INPU T, 150 k s ps, 3 .6 MH Z C L O CK, B IPOLA R INPU T M O DE. MA X114 4 , 12 V . MA X114 5 , P-P 4 .096 V .) P-P f = 5kHz 78 82 Signal-to-Noise Plus Distortion IN dB (SINAD) f = 75kHz 81 IN f = 5kHz 78 82 Signal-to-Noise Ratio IN dB (SNR) f = 75kHz 81 IN f = 5kHz -100 -90 Total Harmonic Distortion IN dB (THD) f = 75kHz -94 IN f = 5kHz 92 105 IN Spurious-Free-Dynamic Range dB (SFDR) f = 75kHz 98 IN ANALOG INPUT Unipolar 0 +6 MAX1144 Bipolar -6 +6 Input Range V Unipolar 0 +2.048 MAX1145 Bipolar -2.048 +2.048 2 MAX1144/MAX1145