MAX1224/MAX1225 19-3271 Rev 1 4/09 1.5Msps, Single-Supply, Low-Power, True-Differential, 12-Bit ADCs General Description Features The MAX1224/MAX1225 low-power, high-speed, serial- 1.5Msps Sampling Rate output, 12-bit, analog-to-digital converters (ADCs) oper- Only 18mW (typ) Power Dissipation ate at up to 1.5Msps. These devices feature true-differen- tial inputs, offering better noise immunity, distortion Only 1A (max) Shutdown Current improvements, and a wider dynamic range over single- High-Speed, SPI-Compatible, 3-Wire Serial Interface ended inputs. A standard SPI/QSPI/MICROWIRE 69dB S/(N + D) at 525kHz Input Frequency interface provides the clock necessary for conversion. These devices easily interface with standard digital signal Internal True-Differential Track/Hold (T/H) processor (DSP) synchronous serial interfaces. External Reference The MAX1224/MAX1225 operate from a single +2.7V to No Pipeline Delays +3.6V supply voltage and require an external reference. The MAX1224 has a unipolar analog input, while the Small 12-Pin TQFN Package MAX1225 has a bipolar analog input. These devices fea- ture a partial power-down mode and a full power-down mode for use between conversions, which lower the sup- ply current to 1mA (typ) and 1A (max), respectively. Also featured is a separate power-supply input (V ), which L allows direct interfacing to +1.8V to V digital logic. The DD fast conversion speed, low-power dissipation, good AC performance, and DC accuracy (1.5 LSB INL) make the MAX1224/MAX1225 ideal for industrial process control, motor control, and base-station applications. Ordering Information The MAX1224/MAX1225 come in a 12-pin TQFN pack- age, and are available in the extended (-40C to +85C) PIN- temperature range. PART TEMP RANGE INPUT PACKAGE Applications MAX1224ETC+T -40C to +85C 12 TQFN Unipolar MAX1225ETC+T -40C to +85C 12 TQFN Bipolar Data Acquisition Communications +Denotes a lead(Pb)-free/RoHS-compliant package. Bill Validation Portable Instruments T = Tape and reel. Motor Control Pin Configuration Typical Operating Circuit TOP VIEW AIN+ N.C. SCLK +1.8V TO V DD +2.7V TO +3.6V 12 11 10 0.01F 0.01F 10F 10F AIN- 1 9 CNVST V V DD L DIFFERENTIAL + DOUT AIN+ REF 2 8 DOUT INPUT MAX1224 - AIN- VOLTAGE MAX1225 C/DSP MAX1224 RGND 3 7 V L MAX1225 CNVST SCLK 45 6 REF REF V N.C. GND DD RGND GND 4.7F 0.01F 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.1.5Msps, Single-Supply, Low-Power, True-Differential, 12-Bit ADCs 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 MAX122 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 = +2.7V to +3.6V, V = V , V = 2.048V, f = 24.0MHz, 50% duty cycle, T = -40C to +85C, unless otherwise noted. DD L DD REF SCLK A Typical values are at V = 3V and T = +25C.) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY Resolution 12 Bits Relative Accuracy INL (Note 1) -1.5 +1.5 LSB Differential Nonlinearity DNL Guaranteed no missing codes (Note 2) -1.0 +1.5 LSB Offset Error 8.0 LSB Offset-Error Temperature 1 ppm/C Coefficient Gain Error Offset nulled 6.0 LSB Gain Temperature Coefficient 2 ppm/C DYNAMIC SPECIFICATIONS (f = 525kHz sine wave, V = V , unless otherwise noted.) IN IN REF SINAD 66 69 dB Signal-to-Noise Plus Distortion Total Harmonic Distortion THD Up to the 5th harmonic -80 -76 dB Spurious-Free Dynamic Range SFDR -83 -76 dB Intermodulation Distortion IMD f = 250kHz, f = 300kHz -78 dB IN1 IN2 Full-Power Bandwidth -3dB point 15 MHz Full-Linear Bandwidth S/(N + D) > 68dB, single ended 1.2 MHz CONVERSION RATE Minimum Conversion Time t (Note 3) 0.667 s CONV Maximum Throughput Rate 1.5 Msps Minimum Throughput Rate (Note 4) 10 ksps Track-and-Hold Acquisition Time t (Note 5) 125 ns ACQ Aperture Delay 5 ns Aperture Jitter (Note 6) 30 ps External Clock Frequency f (Note 7) 24.0 MHz SCLK 2 MAX1224/MAX1225