MAX1191 19-2836 Rev 1 9/03 Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC General Description Features The MAX1191 is an ultra-low-power, dual, 8-bit, Ultra-Low Power 7.5Msps analog-to-digital converter (ADC). The device 12mW (Normal Operation: 7.5Msps) features two fully differential wideband track-and-hold 0.3W (Shutdown Mode) (T/H) inputs. These inputs have a 440MHz bandwidth Excellent Dynamic Performance and accept fully differential or single-ended signals. The MAX1191 delivers a typical signal-to-noise and dis- 48.7dB SNR at f = 1.875MHz IN tortion (SINAD) of 48.6dB at an input frequency of 69dBc SFDR at f = 1.875MHz IN 1.875MHz and a sampling rate of 7.5Msps while con- 2.7V to 3.6V Single Analog Supply suming only 12mW. This ADC operates from a 2.7V to 1.8V to 3.6V TTL/CMOS-Compatible Digital 3.6V analog power supply. A separate 1.8V to 3.6V Outputs supply powers the digital output driver. In addition to ultra-low operating power, the MAX1191 features three Fully Differential or Single-Ended Analog Inputs power-down modes to conserve power during idle peri- Internal/External Reference Option ods. Excellent dynamic performance, ultra-low power, and small size make the MAX1191 ideal for applica- Multiplexed CMOS-Compatible Tri-State Outputs tions in imaging, instrumentation, and digital communi- 28-Pin Thin QFN Package cations. Evaluation Kit Available (Order MAX1193EVKIT) An internal 1.024V precision bandgap reference sets the full-scale range of the ADC to 0.512V. A flexible Ordering Information reference structure allows the MAX1191 to use its inter- nal reference or accept an externally applied reference PART TEMP RANGE PIN-PACKAGE for applications requiring increased accuracy. 28 Thin QFN-EP* The MAX1191 features parallel, multiplexed, CMOS- MAX1191ETI-T -40C to +85C (5mm x 5mm) compatible tri-state outputs. The digital output format is offset binary. A separate digital power input accepts a *EP = Exposed paddle. voltage from 1.8V to 3.6V for flexible interfacing to dif- ferent logic levels. The MAX1191 is available in a 5mm 5mm, 28-pin thin QFN package, and is specified for the extended industrial (-40C to +85C) temperature Pin Configuration range. TOP VIEW For higher sampling frequency applications, refer to the MAX1195MAX1198 dual 8-bit ADCs. Pin-compatible versions of the MAX1191 are also available. Refer to the MAX1192 data sheet for 22Msps, and the MAX1193 data sheet for 45Msps. INA- D0 1 21 Applications INA+ 2 20 D1 Ultrasound and Medical Imaging GND 3 19 D2 IQ Baseband Sampling CLK 4 18 D3 Battery-Powered Portable Instruments MAX1191 GND 5 17 A/B Low-Power Video INB+ 6 16 D4 WLAN, Mobile DSL, WLL Receiver EXPOSED PADDLE INB- 7 15 D5 5mm x 5mm THIN QFN 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. V 8 28 V DD DD V 9 27 REFP DD GND 26 REFN 10 OGND 11 25 COM OV DD 12 24 REFIN D7 13 23 PD0 D6 14 22 PD1Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC 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 + 0.3V) Storage Temperature Range .............................-65C to +150C DD CLK, REFIN, REFP, REFN, COM to GND...-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD PD0, PD1 to OGND .................................-0.3V to (OV + 0.3V) DD Digital Outputs to OGND.........................-0.3V to (OV + 0.3V) DD Continuous Power Dissipation (T = +70C) A 28-Pin Thin QFN (derated 20.8mW/C above +70C) ...1667mW 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 = 3.0V, OV = 1.8V, V = V (internal reference), C 10pF at digital outputs, f = 7.5MHz, C = C = C DD DD REFIN DD L CLK REFP REFN COM = 0.33F, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY Resolution 8 Bits Integral Nonlinearity INL 0.15 1.00 LSB Differential Nonlinearity DNL No missing codes over temperature 0.13 1.00 LSB +25C 4 Offset Error %FS <+25C 6 Gain Error Excludes REFP - REFN error 2 %FS DC Gain Matching 0.01 0.2 dB Gain Temperature Coefficient 30 ppm/C Offset (V 5%) 0.2 DD Power-Supply Rejection LSB Gain (V 5%) 0.05 DD ANALOG INPUT Differential Input Voltage Range V Differential or single-ended inputs 0.512 V DIFF Common-Mode Input Voltage V V / 2 V COM DD Range Input Resistance R Switched capacitor load 720 k IN Input Capacitance C 5pF IN CONVERSION RATE Maximum Clock Frequency f 7.5 MHz CLK Channel A 5.0 Clock Data Latency cycles Channel B 5.5 DYNAMIC CHARACTERISTICS (differential inputs, 4096 point FFT) f = 1.875MHz 47 48.7 IN Signal-to-Noise Ratio SNR dB (Note 2) f = 3.75MHz 48.6 IN f = 1.875MHz 47 48.6 Signal-to-Noise and Distortion IN SINAD dB (Note 2) f = 3.75 48.5 IN 2 MAX1191