MAX1236MAX1239 19-2333 Rev 7 5/10 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs General Description Features The MAX1236MAX1239 low-power, 12-bit, multichan- 2 High-Speed I C-Compatible Serial Interface nel analog-to-digital converters (ADCs) feature internal 400kHz Fast Mode track/hold (T/H), voltage reference, clock, and an 1.7MHz High-Speed Mode 2 I C-compatible 2-wire serial interface. These devices Single-Supply operate from a single supply of 2.7V to 3.6V (MAX1237/ 2.7V to 3.6V (MAX1237/MAX1239) MAX1239) or 4.5V to 5.5V (MAX1236/MAX1238) and 4.5V to 5.5V (MAX1236/MAX1238) require only 670A at the maximum sampling rate of Internal Reference 94.4ksps. Supply current falls below 230A for sam- 2.048V (MAX1237/MAX1239) pling rates under 46ksps. AutoShutdown powers 4.096V (MAX1236/MAX1238) down the devices between conversions, reducing sup- External Reference: 1V to V DD ply current to less than 1A at low throughput rates. Internal Clock The MAX1236/MAX1237 have four analog input chan- 4-Channel Single-Ended or 2-Channel Fully nels each, while the MAX1238/MAX1239 have 12 ana- Differential (MAX1236/MAX1237) log input channels each. The fully differential analog 12-Channel Single-Ended or 6-Channel Fully inputs are software configurable for unipolar or bipolar, Differential (MAX1238/MAX1239) and single-ended or differential operation. Internal FIFO with Channel-Scan Mode The full-scale analog input range is determined by the Low Power internal reference or by an externally applied reference 670A at 94.4ksps voltage ranging from 1V to V . The MAX1237/ DD 230A at 40ksps MAX1239 feature a 2.048V internal reference and the 60A at 10ksps MAX1236/MAX1238 feature a 4.096V internal reference. 6A at 1ksps The MAX1236/MAX1237 are available in an 8-pin MAX 0.5A in Power-Down Mode package. The MAX1238/MAX1239 are available in a 16- Software-Configurable Unipolar/Bipolar pin QSOP package. The MAX1236MAX1239 are guar- Small Packages anteed over the extended temperature range 8-Pin MAX (MAX1236/MAX1237) (-40C to +85C). For pin-compatible 10-bit parts, refer to 16-Pin QSOP (MAX1238/MAX1239) the MAX1136MAX1139 data sheet. For pin-compatible 8-bit parts, refer to the MAX1036MAX1039 data sheet. Applications Ordering Information Handheld Portable Solar-Powered Remote 2 PIN- I C SLAVE PART TEMP RANGE Applications Systems PACKAGE ADDRESS Medical Instruments Received-Signal-Strength MAX1236EUA+ -40C to +85C 8 MAX 0110100 Indicators Battery-Powered Test MAX1237EUA+ -40C to +85C 8 MAX 0110100 Equipment System Supervision MAX1238EEE+ -40C to +85C 16 QSOP 0110101 MAX1238EEE/V+ -40C to +85C 16 QSOP 0110101 MAX1239EEE+ -40C to +85C 16 QSOP 0110101 Selector Guide +Denotes a lead(Pb)-free/RoHS-compliant package. INTERNAL SUPPLY /V denotes an automotive qualified part. INPUT INL PART REFERENCE VOLTAGE CHANNELS (LSB) (V) (V) MAX1236 4 4.096 4.5 to 5.5 1 MAX1237 4 2.048 2.7 to 3.6 1 MAX1238 12 4.096 4.5 to 5.5 1 MAX1239 12 2.048 2.7 to 3.6 1 AutoShutdown is a trademark of Maxim Integrated Products, Inc. Pin Configurations and Typical Operating Circuit appear at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. 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.2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C DD AIN0AIN11, Junction Temperature......................................................+150C REF to GND............-0.3V to the lower of (V + 0.3V) and 6V Storage Temperature Range .............................-60C to +150C DD SDA, SCL to GND.....................................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C Maximum Current Into Any Pin.........................................50mA Soldering Temperature (reflow) .......................................+260C Continuous Power Dissipation (T = +70C) A 8-Pin MAX (derate 5.9mW/C above +70C) ..........470.6mW 16-Pin QSOP (derate 8.3mW/C above +70C)........666.7mW 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 (MAX1237/MAX1239), V = 4.5V to 5.5V (MAX1236/MAX1238), V = 2.048V (MAX1237/MAX1239), V = DD DD REF REF 4.096V (MAX1236/MAX1238), f = 1.7MHz, T = T to T , unless otherwise noted. Typical values are at T = +25C, see SCL A MIN MAX A Tables 15 for programming notation.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 12 Bits Relative Accuracy INL (Note 2) 1 LSB Differential Nonlinearity DNL No missing codes over temperature 1 LSB Offset Error 4 LSB Offset-Error Temperature Relative to FSR 0.3 ppm/C Coefficient Gain Error (Note 3) 4 LSB Gain-Temperature Coefficient Relative to FSR 0.3 ppm/C Channel-to-Channel Offset 0.1 LSB Matching Channel-to-Channel Gain 0.1 LSB Matching DYNAMIC PERFORMANCE (f = 10kHz, V = V , f = 94.4ksps) IN(SINE-WAVE) IN(P-P) REF SAMPLE Signal-to-Noise Plus Distortion SINAD 70 dB Total Harmonic Distortion THD Up to the 5th harmonic -78 dB Spurious-Free Dynamic Range SFDR 78 dB Full-Power Bandwidth SINAD > 68dB 3 MHz Full-Linear Bandwidth -3dB point 5 MHz CONVERSION RATE Internal clock 7.5 Conversion Time (Note 4) t s CONV External clock 10.6 2 MAX1236MAX1239