EVALUATION KIT AVAILABLE MAX121 308ksps ADC with DSP Interface and 78dB SINAD General Description Benefits and Features The MAX121 is a complete, BiCMOS, serial-output, 14-Bit Resolution sampling 14-bit analog-to-digital converter (ADC) that 2.9s Conversion Time/308ksps Throughput com bines an on-chip track/hold and a low-drift, low- 400ns Acquisition Time noise, buried-zener voltage reference with fast conversion speed and low power consumption. The throughput rate Low Noise and Distortion 78d8 SINAD is as high as 308k samples per second (ksps). The full- scale analog input range is 5V. -85dB THD The MAX121 utilizes the successive-approximation archi- 5V Bipolar Input Range, Overvoltage Tolerant to 15V tecture with a high-speed DAC to achieve both fast conversion speeds and low-power operation. Operating 210mW Power Dissipation with +5V and -12V or -15V power supplies, power con- Continuous-Conversion Mode Available sumption is only 210mW. 30ppm/C, -5V Internal Reference The MAX121 can be directly interfaced to the serial port Interfaces to DSP Processors of most popular digital-signal processors, and comes in space-saving 16-pin DIP and SO and smaller 20-pin 16-Pin DIP and SO Packages, SSOP packages. The MAX121 operates with TTL- and 20-Pin SSOP Package CMOS-compatible clocks in the frequency range from 1.1MHz to 5.5MHz. All logic inputs and outputs are TTL- Functional Diagram and CMOS-compatible. This data sheet includes applica- tion notes for easy interface to TMS320, PD77230, and ADSP2101 digital-signal processors, as well as Ps using V DD SAMPLING the Motorola SPI and QSPI interface standards. COMPARATOR MAX121 BUFFER AGND 7pF DGND 3k Applications TRACK/HOLD AIN V SS Digital Signal Processing 3k Audio and Telecom Processing V -5V REF DAC Speech Recognition and Synthesis DSP Servo Control Spectrum Analysis SAR SDATA REFERENCE SCLK Ordering Information appears at end of data sheet. FSTRT CLIKIN CONTROL LOGIC SFRM For related parts and recommended products to use with this part, refer CONVST CS MODE INVCLK INVFRM to www.maximintegrated.com/MAX121.related. 19-0108 Rev 3 1/12MAX121 308ksps ADC with DSP Interface and 78dB SINAD Absolute Maximum Ratings V to DGND .......................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) DD A V to DGND ........................................................+0.3V to -17V 16-Pin PDIP (derate 10.53mW/C above +70C) .........842mW SS AIN to AGND .......................................................................15V 16-Pin Wide SO (derate 9.52mW/C above +70C) .....762mW AGND to DGND .................................................................0.3V 20-Pin SSOP (derate 8.00mW/C above +70C)..........640mW Digital Inputs to DGNO ............................. -0.3V to (V + 0.3V) Operating Temperature Ranges DD (CS, CONVST, MODE, CLKIN, INVCLK, INVFRM) MAX121C ..........................................................0C to +70C Digital Outputs to DGND ......................... +0.3V to (V + 0.3V) MAX121E ...................................................... -40C to +85C DD (SFRM, FSTRT, SCLK, SDATA) Storage Temperature Range ........................... -65C to + 160C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C 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 = 4.75V to 5.25V, V = -10.8V to -15.75V, f = 5.5MHz, T = T to T , unless otherwise noted.) DD SS CLK A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DYNAMIC PERFORMANCE (f = 308kHz, V = 10V , 50kHz) S AIN P-P MAX121C 75 78 Signal-to-Noise Ratio SINAD Including distortion dB MAX121E 73 77 Total Harmonic Distortion THD First five harmonics -85 -77 dB Spurious-Free Dynamic Range SFDR 77 86 dB ACCURACY Resolution RES 14 Bits 12 bits no missing codes over temperature Differential Nonlinearity (Note 1) DNL 1.5 LSB range Integral Nonlinearity INL 2 LSB Code 00..00 to 00..01 transition, 10 mV near V = 0V Bipolar Zero Error AIN Temperature drift 1 ppm/C Including reference adjusted for bipolar Full-Scale Error (Notes 1, 2) 0.2 % zero error T = +25C A Full-Scale Temperature Drift Excluding reference 1 ppm/C 1/2 2 V only, 5V 5% DD Power-Supply Rejection 1 2 LSB V only, -12V 10% SS 1 2 V only, -15V 5% SS ANALOG INPUT Input Range -5 +5 V Input Current V = 5V (R approximately 6k W to REF) 2.5 mA AIN IN Input Capacitance (Note 3) 10 pF Full-Power Bandwidth 1.5 MHz Maxim Integrated 2 www.maximintegrated.com