MAX1076/MAX1078 19-3291 Rev 1 4/09 1.8Msps, Single-Supply, Low-Power, True- Differential, 10-Bit ADCs with Internal Reference General Description Features The MAX1076/MAX1078 are low-power, high-speed, seri- 1.8Msps Sampling Rate al-output, 10-bit, analog-to-digital converters (ADCs) that operate at up to 1.8Msps and have an internal reference. Only 50mW (typ) Power Dissipation These devices feature true-differential inputs, offering bet- Only 1A (max) Shutdown Current ter noise immunity, distortion improvements, and a wider dynamic range over single-ended inputs. A standard High-Speed, SPI-Compatible, 3-Wire Serial Interface SPI/QSPI/MICROWIRE interface provides the clock necessary for conversion. These devices easily interface 61dB S/(N + D) at 525kHz Input Frequency with standard digital signal processor (DSP) synchronous Internal True-Differential Track/Hold (T/H) serial interfaces. The MAX1076/MAX1078 operate from a single +4.75V to Internal 4.096V Reference +5.25V supply voltage. The MAX1076/MAX1078 include No Pipeline Delays a 4.096V internal reference. The MAX1076 has a unipolar analog input, while the MAX1078 has a bipolar analog Small 12-Pin TQFN Package input. These devices feature a partial power-down mode and a full power-down mode for use between conver- sions, which lower the supply current to 2mA (typ) and 1A (max), respectively. Also featured is a separate power-supply input (V ), which allows direct interfacing to L +1.8V to V digital logic. The fast conversion speed, DD low-power dissipation, excellent AC performance, and DC accuracy (0.5 LSB INL) make the MAX1076/MAX1078 ideal for industrial process control, motor control, and base-station applications. Ordering Information The MAX1076/MAX1078 come in a 12-pin TQFN pack- age, and are available in the extended (-40C to +85C) PIN- PART TEMP RANGE INPUT temperature range. PACKAGE MAX1076ETC+T -40C to +85C 12 TQFN Unipolar Applications MAX1078ETC+T -40C to +85C 12 TQFN Bipolar Data Acquisition Communications +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Bill Validation Portable Instruments Motor Control Typical Operating Circuit Pin Configuration TOP VIEW AIN+ N.C. SCLK +1.8V TO V DD +4.75V TO +5.25V 12 11 10 10F 0.01F 0.01F 10F AIN- 1 9 CNVST V V DD L DIFFERENTIAL + AIN+ DOUT REF 2 8 DOUT MAX1076 INPUT - AIN- VOLTAGE MAX1078 C/DSP RGND 3 7 V L MAX1076 CNVST MAX1078 SCLK REF 45 6 4.7F 0.01F V N.C. GND RGND GND DD TQFN SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. 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.1.8Msps, Single-Supply, Low-Power, True- Differential, 10-Bit ADCs with Internal Reference ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Maximum Current into Any Pin............................................50mA DD V to GND ................-0.3V to the lower of (V + 0.3V) and +6V Continuous Power Dissipation (T = +70C) L DD A Digital Inputs 12-Pin TQFN (derate 16.9mW/C above +70C) ......1349mW to GND .................-0.3V to the lower of (V + 0.3V) and +6V Operating Temperature Range DD Digital Output MAX107 ETC.................................................-40C to +85C to GND....................-0.3V to the lower of (V + 0.3V) and +6V Junction Temperature......................................................+150C L Analog Inputs and Storage Temperature Range .............................-60C to +150C REF to GND..........-0.3V to the lower of (V + 0.3V) and +6V Lead Temperature (soldering, 10s) .................................+300C DD RGND to GND .......................................................-0.3V to +0.3V 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 (V = +5V 5%, V = V , f = 28.8MHz, 50% duty cycle, T = -40C to +85C, unless otherwise noted. Typical values are at DD L DD SCLK A T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY Resolution 10 Bits Relative Accuracy INL (Note 1) 0.5 LSB Differential Nonlinearity DNL (Note 2) 0.5 LSB Offset Error 2 LSB Offset-Error Temperature 1 ppm/C Coefficient Gain Error Offset nulled 2 LSB Gain Temperature Coefficient 2 ppm/C DYNAMIC SPECIFICATIONS (f = 525kHz sine wave, V = V , unless otherwise noted.) IN IN REF Signal-to-Noise Plus Distortion SINAD 60 61 dB Total Harmonic Distortion THD Up to the 5th harmonic -80 -74 dB Spurious-Free Dynamic Range SFDR -80 -74 dB Intermodulation Distortion IMD f = 250kHz, f = 300kHz -78 dB IN1 IN2 Full-Power Bandwidth -3dB point, small-signal method 20 MHz Full-Linear Bandwidth S/(N + D) > 56dB, single ended 2 MHz CONVERSION RATE Minimum Conversion Time t (Note 3) 0.556 s CONV Maximum Throughput Rate 1.8 Msps Minimum Throughput Rate (Note 4) 10 ksps Track-and-Hold Acquisition Time t (Note 5) 104 ns ACQ Aperture Delay 5 ns Aperture Jitter (Note 6) 30 ps External Clock Frequency f 28.8 MHz SCLK 2 MAX1076/MAX1078