MAX1377/MAX1379/MAX1383 19-4126 Rev 1 2/09 Dual, 12-Bit, 1.25Msps Simultaneous-Sampling ADCs with Serial Interface General Description Features Dual, Simultaneous-Sampling, 12-Bit Successive The MAX1377/MAX1379/MAX1383 feature two simulta- Approximation Register (SAR) ADCs neous-sampling, low-power, 12-bit ADCs with serial interface and internal voltage reference. Fast sampling 2 x 2 Mux Inputs or Two Differential Inputs rate, low power dissipation, and excellent dynamic per- 1.25Msps Sampling Rate per ADC formance make the MAX1377/MAX1379/MAX1383 Internal or External Reference ideal for industrial process control, motor control, and Excellent Dynamic Performance RF applications. 70dB SINAD (MAX1377) Conversion results are available through a SPI-/ 71dB SINAD (MAX1379/MAX1383) QSPI-/MICROWIRE-/DSP-compatible interface with 84dBc/SFDR 1MHz Full-Linear Bandwidth independent serial digital outputs for each channel. The serial outputs allow twice as much data to be transferred 2.7V to 3.6V Low-Power Operation (MAX1377) at the given clock rate. The conversion results for both 50mW (Normal Operation) 6mW (Partial Power-Down) ADCs can also be output on a single digital output for 3W (Full Power-Down) microcontrollers (Cs) and DSPs with only a single serial input available. 4.75V to 5.25V Low-Power Operation (MAX1379) 90mW (Normal Operation) The MAX1377 operates from a 2.7V to 3.6V analog sup- 10mW (Partial Power-Down) ply and the MAX1379/MAX1383 operate from a 4.75V 5W (Full Power-Down) to 5.25V analog supply. A separate 1.8V to AVDD digi- 4.75V to 5.25V Low-Power Operation (MAX1383) tal supply allows interfacing to low voltage logic without 280mW (Normal Operation) the use of level translators. 2.5W (Full Power-Down) Two power-down modes, partial and full, allow the 20MHz, SPI-Compatible, 3-Wire Serial Interface MAX1377/MAX1379 and MAX1383 (full power-down only) User-Selectable Single (0.625Msps max) or Dual to save power between conversions. Partial power-down Outputs (1.25Msps max) mode reduces the supply current to 2mA while leaving Input Range: 10V (MAX1383), 0V or REF the reference enabled for quick power-up. Full power- V /2 (MAX1377/MAX1379) REF down mode reduces the supply current to 1A. Small 20-Pin TQFN Package The MAX1377/MAX1379 inputs accept voltages SPI/QSPI are trademarks of Motorola, Inc. between zero and the reference voltage or V /2. REF MICROWIRE is a trademark of National Semiconductor Corp. The MAX1383 offers an input voltage range of 10V, which is ideal for industrial and motor-control applica- Functional Diagram tions. The input to each of the ADCs supports either a V AVDD L true-differential input or two single-ended inputs. AIN1A The MAX1377/MAX1379/MAX1383 are available in a MAX1377 MAX1379 20-pin TQFN package, and are specified for the automo- MAX1383 12-BIT AIN1B MUX T/H SAR DOUT1 tive (-40C to +125C) temperature range. OUTPUT ADC1 BUFFER Applications CS REF SERIAL REFSEL CNVST Motor Control Bill Validation INTERFACE AND TIMING SCLK Communications Portable Instruments A = 1 INTERNAL Data Acquisition RGND U/B REFERENCE CONTROL LOGIC S/D Ordering Information V L PART TEMP RANGE PIN-PACKAGE AIN2A 12-BIT T/H SAR MUX DOUT2 OUTPUT MAX1377ATP+ -40C to +125C 20 TQFN-EP* ADC2 BUFFER AIN2B MAX1379ATP+ -40C to +125C 20 TQFN-EP* MAX1383ATP+ -40C to +125C 20 TQFN-EP* AGND SEL DGND +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Pin Configuration appears at end of data sheet. Maxim Integrated Products 1 For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Dual, 12-Bit, 1.25Msps Simultaneous-Sampling ADCs with Serial Interface ABSOLUTE MAXIMUM RATINGS AVDD to AGND ........................................................-0.3V to +6V RGND to DGND.....................................................-0.3V to +0.3V V to DGND ..............................................................-0.3V to +6V DGND to AGND.....................................................-0.3V to +0.3V L SCLK, CS, CNVST, U/B, S/D, SEL, Maximum Current into Any Pin (except power-supply pins).....50mA REFSEL to DGND.......................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) L A DOUT to DGND...........................................-0.3V to (V + 0.3V) 20-Pin Thin QFN (derate 34.5mW/C above +70C) ...2758.6mW L AIN1A, AIN1B, AIN2A, AIN2B to AGND Operating Temperature Range .........................-40C to +125C MAX1377/MAX1379 .............................-0.3V to (AVDD + 0.3V) Junction Temperature......................................................+150C MAX1383..............................................................-12V to +12V Storage Temperature Range .............................-60C to +150C RGND to AGND.....................................................-0.3V to +0.3V Lead Temperature (soldering, 10s) .................................+300C 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 CHARACTERISTICSMAX1377 (V = 2.7V to 3.6V, V = 1.8V to AVDD, f = 20MHz (50% duty cycle), V = 2.048V, REFSEL = V , S/D = DGND, C = AVDD L SCLK REF L REF 1F T = T to T , unless otherwise noted. Typical values are at T = +25C.) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY Resolution 12 Bits Relative Accuracy INL (Note 1) -1.25 +1.25 LSB Differential Nonlinearity DNL -1 +1.5 LSB Offset Error 8 LSB Offset-Error Matching 12 LSB Gain Error (Note 2) 6 LSB Gain-Error Matching (Note 2) 6 LSB o Gain Temperature Coefficient 2 ppm/ C AIN1A to AIN1B, AIN2A to AIN2B 80 DC Input Isolation dB AIN1A to AIN2A, AIN1B to AIN2B 80 DYNAMIC SPECIFICATIONS (f = 500kHz, 2V sine wave, 1.25Msps, 20MHz f ) IN P-P SCLK Unipolar 66 69.5 Signal-to-Noise Plus Distortion SINAD dB Bipolar 67 70 Unipolar 66 70 Signal-to-Noise Ratio SNR dB Bipolar 67 70 Total Harmonic Distortion THD Up to the 5th harmonic -84 -74 dB Spurious-Free Dynamic Range SFDR -86 -76 dB Intermodulation Distortion IMD f = 103.5kHz, f = 113.5kHz -78 dB IN1 IN2 Full-Power Bandwidth -3dB point 5 MHz Full-Linear Bandwidth (S/N + D) > 68dB, 1V input 1 MHz CONVERSION RATE (Figure 4) Minimum Conversion Time t 16 clock cycles per conversion (Note 3) 0.800 s CONV Dual output mode, S/D = 0 1.25 Maximum Throughput Rate Msps Single output mode, S/D = 1 0.625 Minimum Throughput Rate for (Note 4) 10 ksps Full Bandwidth Signal 2 MAX1377/MAX1379/MAX1383