MAX1421 19-1900 Rev 1 5/06 12-Bit, 40Msps, 3.3V, Low-Power ADC with Internal Reference General Description Features The MAX1421 is a 3.3V, 12-bit analog-to-digital con- Single 3.3V Power Supply verter (ADC), featuring a fully-differential input, 67dB SNR at f = 5MHz IN pipelined, 12-stage ADC architecture with wideband track-and-hold (T/H) and digital error correction incor- 66dB SNR at f = 15MHz IN porating a fully-differential signal path. The MAX1421 is Internal, 2.048V Precision Bandgap Reference optimized for low-power, high-dynamic performance applications in imaging and digital communications. Differential, Wideband Input T/H Amplifier The converter operates from a single 3.3V supply, con- Power-Down Modes suming only 188mW while delivering a typical signal-to- noise ratio (SNR) of 66dB at an input frequency of 180mW (Reference Shutdown Mode) 15MHz and a sampling frequency of 40Msps. The fully- 10W (Shutdown Mode) differential input stage has a small signal -3dB band- Space-Saving 48-Pin TQFP Package width of 400MHz and may be operated with single-ended inputs. An internal 2.048V precision bandgap reference sets the full-scale range of the ADC. A flexible reference Ordering Information structure accommodates an internal or externally PIN- PKG applied buffered or unbuffered reference for applica- PART* TEMP RANGE PACKAGE CODE tions requiring increased accuracy or a different input voltage range. M AX1421CCM 0C to +70C 48 TQFP C48-2 In addition to low operating power, the MAX1421 fea- M AX1421ECM -40 C to +85C 48 TQFP C48-2 tures two power-down modes, a reference power-down M AX1421ECM+ -40C to +85C 48 TQFP C48-2 and a shutdown mode. In reference power-down, the +Denotes lead-free package. internal bandgap reference is deactivated, resulting in a typical 2mA supply current reduction. For idle peri- ods, a full shutdown mode is available to maximize power savings. Pin Configuration The MAX1421 provides parallel, offset binary, CMOS- compatible three-state outputs. The MAX1421 is available in a 7mm x 7mm, 48-pin TQFP package, and is specified over the commercial (0C to +70C) and the extended industrial (-40C to +85C) temperature ranges. AGND 1 36 D9 Pin-compatible higher- and lower-speed versions of the AV 2 35 D8 DD MAX1421 are also available. Please refer to the AV 3 34 D7 DD MAX1420 data sheet for a frequency of 60Msps and AGND 4 33 D6 the MAX1422 data sheet for a frequency of 20Msps. AGND 5 32 DV DD INP 6 31 DV DD MAX1421 Applications INN 7 30 DGND AGND DGND 8 29 Medical Ultrasound Imaging AGND 9 28 D5 CCD Pixel Processing AV 10 27 D4 DD AV 11 26 D3 DD Data Acquisition AGND 12 25 D2 Radar IF and Baseband Digitization 48-TQFP Functional Diagram appears at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. AGND 13 48 AGND AV 14 47 AV DD DD 15 46 CML AV DD AGND 16 45 REFN CLK 17 44 REFP CLK 18 43 REFIN AGND 19 42 AV DD AV 20 41 AGND DD DV 21 40 PD DD DGND 22 39 OE D0 23 38 D11 D1 24 37 D1012-Bit, 40Msps, 3.3V, Low-Power ADC with Internal Reference ABSOLUTE MAXIMUM RATINGS AV , DV to AGND..............................................-0.3V to +4V Maximum Junction Temperature .....................................+150C DD DD DV , AV to DGND..............................................-0.3V to +4V Operating Temperature Ranges DD DD DGND to AGND.....................................................-0.3V to +0.3V MAX1421CCM ...................................................0C to +70C INP, INN, REFP, REFN, REFIN, MAX1421ECM ................................................-40C to +85C CML, CLK, CLK,....................(AGND - 0.3V) to (AV + 0.3V) Storage Temperature Range .............................-65C to +150C DD D0D11, OE, PD .......................(DGND - 0.3V) to (DV + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD Continuous Power Dissipation (T = +70C) A 48-Pin TQFP (derate 12.5mW/C above +70C)........1000mW 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 = V = 3.3V, AGND = DGND = 0, V = 1.024V, differential input voltage at -0.5dB FS, internal reference, AVDD DVDD IN f = 40MHz (50% duty cycle), digital output load C 10pF, T +25C guaranteed by production test, T < +25C guarnateed CLK L A A by design and characterization. Typical values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY Resolution RES 12 Bits T = +25C, no missing codes -1 +1 A Differential Nonlinearity DNL LSB T = T to T 0.5 A MIN MAX Integral Nonlinearity INL T = T to T 2 LSB A MIN MAX Midscale Offset MSO -3 .75 +3 %FSR Midscale Offset Temperature -4 MSOTC 3 10 %/C Coefficient Internal reference (Note 1) -5 +0.1 +5 External reference applied to REFIN (Note 2) -5 3 +5 Gain Error GE %FSR External reference applied to REFP, CML, -1.5 0.5 +1.5 and REFN (Note 3) Gain-Error Temperature External reference applied to REFP, CML, -6 GETC 15 10 %/C Coefficient and REFN (Note 3) DYNAMIC PERFORMANCE (f = 40MHz, 4096-point FFT) CLK f = 5MHz 67 IN Signal-to-Noise Ratio SNR dB f = 15MHz, T = +25C6266 IN A f = 5MHz 73 IN Spurious-Free Dynamic Range SFDR dBc f = 15MHz, T = +25C6470 IN A f = 5MHz -74 IN Total Harmonic Distortion THD dBc f = 15MHz, T = +25C -69 -62 IN A f = 5MHz 66 IN Signal-To-Noise Plus Distortion SINAD dB f = 15MHz, T = +25C60 63.5 IN A f = 5MHz 10.7 IN Effective Number of Bits ENOB Bits f = 15MHz, T = +25C60 10.3 IN A Two-Tone Intermodulation f = 11.569MHz, f = 13.445MHz IN1 IN2 IMD -80 dBc TT Distortion (Note 4) 2 MAX1421