MAX1011 19-1335 Rev 0a 2/98 Low-Power, 90Msps, 6-Bit ADC General Description Features The MAX1011 is a 6-bit analog-to-digital converter High Sampling Rate: 90Msps (ADC) that combines high-speed, low-power operation Low Power Dissipation: 215mW with a user-selectable input range, an internal refer- ence, and a clock oscillator. The ADC converts analog Excellent Dynamic Performance: signals into binary-coded digital outputs at sampling 5.85 ENOB with 20MHz Analog Input rates up to 90Msps. The ability to directly interface with 5.7 ENOB with 50MHz Analog Input baseband signals makes the MAX1011 ideal for use in 1/4LSB INL and DNL (typ) a wide range of communications and instrumentation applications. 1/4LSB Input Offset (typ) The MAX1011s input amplifier features a true differential Internal Bandgap Voltage Reference input, a -0.5dB analog bandwidth of 55MHz, and a user- Internal Oscillator with Overdrive Capability programmable input full-scale range of 125mVp-p, 250mVp-p, or 500mVp-p. With an AC-coupled signal, 55MHz (-0.5dB) Bandwidth Input Amplifier with input offset is typically less than 1/4LSB. Dynamic per- True Differential Input formance is 5.85 effective number of bits (ENOB) with a User-Selectable Full-Scale Range 20MHz analog input signal, or 5.7 ENOB with a 50MHz (125mVp-p, 250mVp-p, or 500mVp-p) signal. Single-Ended or Differential Input Drive The MAX1011 operates with +5V analog and +3.3V digi- tal supplies for easy interfacing to +3.3V-logic-compatible Flexible, 3.3V, CMOS-Compatible Digital Outputs digital signal processors and microprocessors. It comes in a 24-pin QSOP package. Applications Ordering Information IF Sampling Receivers PART TEMP. RANGE PIN-PACKAGE VSAT Receivers MAX1011CEG 0C to +70C 24 QSOP Wide Local Area Networks (WLANs) Pin Configuration appears at end of data sheet. Instrumentation Functional Diagram OCC+ OCC- IN+ ADC 6 6 D0D5 INPUT DATA BUFFER AMP IN- VREF DCLK OFFSET CLOCK CORREC- OUT TION TNK+ GAIN BANDGAP CLOCK REFERENCE DRIVER TNK- MAX1011 Maxim Integrated Products 1 For free samples & the latest literature: Low-Power, 90Msps, 6-Bit ADC ABSOLUTE MAXIMUM RATINGS V to GND ..........................................................-0.3V to +6.5V Continuous Power Dissipation (T = +70C) CC A V to OGND......................................................-0.3V to +6.5V 24-Pin QSOP (derate 10mW/C above +70C)...........800mW CCO GND to OGND ......................................................-0.3V to +0.3V Operating Temperature Range...............................0C to +70C Digital and Clock Output Pins to OGND...-0.3V to V (10sec) Storage Temperature Range .............................-65C to +150C CCO All Other Pins to GND...............................................-0.3V to V Lead Temperature (soldering, <10sec)...........................+300C CC 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. DC ELECTRICAL CHARACTERISTICS (V = +5V 5%, V = 3.3V 300mV, T = T to T , unless otherwise noted.) CC CCO A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution RES 6 Bits Integral Nonlinearity INL -0.5 0.25 0.5 LSB Differential Nonlinearity DNL No missing codes over temperature -0.5 0.25 0.5 LSB V GAIN = V (high gain) 118.75 125 131.25 FSH CC Full-Scale Input Range V GAIN = open (mid gain) 237.5 250 262.5 mVp-p FSM V GAIN = GND (low gain) 475 500 525 FSL INVERTING AND NONINVERTING ANALOG INPUTS Input Open-Circuit Voltage V 2.25 2.35 2.45 V AOC Input Resistance R 13 20 29 k IN Input Capacitance C Guaranteed by design 1.5 3 pF IN Other analog input driven with external source Common-Mode Voltage Range V 1.75 2.75 V CM (Note 2) OSCILLATOR INPUTS Oscillator Input Resistance R Other oscillator input tied to V + 0.3V 4.8 8 12.1 k OSC CC DIGITAL OUTPUTS (D0D5) Digital Outputs Logic-High V I = 50A 0.7V V OH SOURCE CCO Voltage Digital Outputs Logic-Low V I = 400A 0.5 V OL SINK Voltage POWER SUPPLY Supply Current I 37 63.5 mA CC Power-Supply Rejection Ratio PSRR V = 4.75V to 5.25V (Note 3) -65 -40 dB CC 20MHz, full-scale analog inputs, Digital Outputs Supply Current I 8.5 13.8 mA CCO C = 15pF (Note 4) L Power Dissipation PD 215 mW 2 MAX1011