MAX1185 19-2175 Rev 3 5/11 Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs General Description Features Single 3V Operation The MAX1185 is a 3V, dual 10-bit analog-to-digital con- verter (ADC) featuring fully-differential wideband track- Excellent Dynamic Performance: 59.5dB SNR at f = 7.5MHz and-hold (T/H) inputs, driving two pipelined, nine-stage IN 74dB SFDR at f = 7.5MHz IN ADCs. The MAX1185 is optimized for low-power, high Low Power: dynamic performance applications in imaging, instru- 35mA (Normal Operation) mentation, and digital communication applications. This 2.8mA (Sleep Mode) ADC operates from a single 2.7V to 3.6V supply, con- 1A (Shutdown Mode) suming only 105mW while delivering a typical signal-to- noise ratio (SNR) of 59.5dB at an input frequency of 0.02dB Gain and 0.25 Phase Matching 7.5MHz and a sampling rate of 20Msps. Digital outputs Wide 1Vp-p Differential Analog Input Voltage A and B are updated alternating on the rising (CHA) Range and falling (CHB) edge of the clock. The T/H driven 400MHz, -3dB Input Bandwidth input stages incorporate 400MHz (-3dB) input ampli- On-Chip 2.048V Precision Bandgap Reference fiers. The converters may also be operated with single- Single 10-Bit Bus for Multiplexed, Digital Outputs ended inputs. In addition to low operating power, the User-Selectable Output FormatTwos MAX1185 features a 2.8mA sleep mode as well as a Complement or Offset Binary 1A power-down mode to conserve power during idle 48-Pin TQFP Package with Exposed Pad for periods. Improved Thermal Dissipation An internal 2.048V precision bandgap reference sets Ordering Information the full-scale range of the ADC. A flexible reference structure allows the use of this internal or an externally TEMP PART PIN-PACKAGE derived reference, if desired for applications requiring RANGE increased accuracy or a different input voltage range. MAX1185ECM -40C to +85C 48 TQFP-EP* The MAX1185 features parallel, multiplexed, CMOS- MAX1185ECM+ -40C to +85C 48 TQFP-EP* compatible three-state outputs. The digital output for- MAX1185ECM/V+ -40C to +85C 48 TQFP-EP* mat can be set to twos complement or straight offset *EP = Exposed pad. binary through a single control pin. The device provides +Denotes a lead(Pb)-free/RoHS-compliant package. for a separate output power supply of 1.7V to 3.6V for /V denotes an automotive qualified part. flexible interfacing. The MAX1185 is available in a 7mm Pin-Compatible Versions table at end of data sheet. x 7mm, 48-pin TQFP package, and is specified for the Pin Configuration extended industrial (-40C to +85C) temperature range. Pin-compatible, nonmultiplexed. high-speed versions of the MAX1185 are also available. Refer to the MAX1180 data sheet for 105Msps, the MAX1181 data sheet for COM 1 36 D1A/B 80Msps, the MAX1182 data sheet for 65Msps, the V 2 35 D0A/B DD MAX1183 data sheet for 40Msps, and the MAX1184 GND 3 34 OGND data sheet for 20Msps. INA+ 4 33 OV DD INA- 5 32 OV DD V 6 31 OGND DD MAX1185 GND 7 30 A/B Applications INB- 8 29 N.C. INB+ 9 28 N.C. High Resolution Imaging GND 10 27 N.C. I/Q Channel Digitization EP V 11 26 N.C. DD CLK N.C. 12 25 Multichannel IF Sampling Instrumentation Video Application Ultrasound 48 TQFP-EP NOTE: THE PIN 1 INDICATOR FOR LEAD-FREE PACKAGES IS REPLACED BY A SIGN. 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. GND 13 48 REFN V 14 REFP DD 47 15 REFIN V 46 DD GND 16 45 REFOUT T/B 17 44 D9A/B SLEEP 18 43 D8A/B PD 19 D7A/B 42 20 D6A/B OE 41 N.C. 21 40 D5A/B N.C. 22 39 D4A/B N.C. 23 38 D3A/B N.C. 24 D2A/B 37Dual 10-Bit, 20Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs ABSOLUTE MAXIMUM RATINGS V , OV to GND ...............................................-0.3V to +3.6V Operating Temperature Range ...........................-40C to +85C DD DD OGND to GND.......................................................-0.3V to +0.3V Junction Temperature......................................................+150C INA+, INA-, INB+, INB- to GND ...............................-0.3V to V Storage Temperature Range .............................-60C to +150C DD REFIN, REFOUT, REFP, REFN, COM, Lead Temperature (soldering, 10s) .................................+300C CLK to GND............................................-0.3V to (V + 0.3V) Soldering Temperature (reflow) DD OE, PD, SLEEP, T/B, D9A/BD0A/B, Lead(Pb)-free..............................................................+260C A/B to OGND .......................................-0.3V to (OV + 0.3V) Containing lead(Pb)....................................................+240C DD Continuous Power Dissipation (T = +70C) A 48-Pin TQFP-EP (derate 30.4mW/C above +70C)............................................................2430mW 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 = 3V, OV = 2.5V, 0.1F and 1F capacitors from REFP, REFN, and COM to GND REFOUT connected to REFIN through a DD DD 10k resistor, V = 2Vp-p (differential w.r.t. COM), C = 10pF at digital outputs (Note 1), f = 20MHz, T = T to T , unless IN L CLK A MIN MAX otherwise noted. Typical values are at T = +25C.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY Resolution 10 Bits Integral Nonlinearity INL f = 7.5MHz 0.5 1.5 LSB IN Differential Nonlinearity DNL f = 7.5MHz, no missing codes guaranteed 0.25 1.0 LSB IN Offset Error < 1 1.9 % FS Gain Error 0 2% FS ANALOG INPUT Differential Input Voltage V Differential or single-ended inputs 1.0 V DIFF Range Common-Mode Input Voltage V /2 DD V V CM Range 0.5 Input Resistance R Switched capacitor load 100 k IN Input Capacitance C 5pF IN CONVERSION RATE Maximum Clock Frequency f 20 MHz CLK CHA 5 Clock Data Latency cycles CHB 5.5 DYNAMIC CHARACTERISTICS f = 7.5MHz, T = +25C 57.3 59.5 Signal-to-Noise Ratio INA or B A SNR dB (Note 3) f = 12MHz 59.4 INA or B f = 7.5MHz, T = +25C 57 59.4 Signal-to-Noise and Distortion INA or B A SINAD dB (Note 3) f = 12MHz 59.2 INA or B f = 7.5MHz, T = +25C 64 74 INA or B A Spurious-Free Dynamic Range SFDR dBc (Note 3) f = 12MHz 72 INA or B 2 MAX1185