Low-Power ADC

www.DataSheet4U.com 19-5400; Rev 2; 5/04 KIT ATION EVALU ILABLE AVA 10-Bit, 80Msps, Single 3.0V, Low-Power ADC with Internal Reference General Description The MAX1448 3V, 10-bit analog-to-digital converter (ADC) features a fully differential input, a pipelined 10stage ADC architecture with wideband track-and-hold (T/H), and digital error correction incorporating a fully differential signal path. The ADC is optimized for lowpower, high dynamic performance in imaging and digital communications applications. The converter operates from a single 2.7V to 3.6V supply, consuming only 120mW while delivering a 59dB (typ) signal-tonoise ratio (SNR) at a 20MHz input frequency. The fully differential input stage has a -3dB 400MHz bandwidth and may be operated with single-ended inputs. In addition to low operating power, the MAX1448 features a 5µA power-down mode for idle periods. An internal 2.048V precision bandgap reference is used to set the ADC full-scale range. A flexible reference structure allows the user to supply a buffered, direct, or externally derived reference for applications requiring increased accuracy or a different input voltage range. Lower speed, pin-compatible versions of the MAX1448 are also available. Refer to the MAX1444 data sheet for a 40Msps version and to the MAX1446 data sheet for a 60Msps version. The MAX1448 has parallel, offset binary, CMOS-compatible three-state outputs that can be operated from 1.7V to 3.6V to allow flexible interfacing. The device is available in a 5mm x 5mm 32-pin TQFP package and is specified over the extended industrial (-40°C to +85°C) temperature range. o Single 3.0V Operation o Excellent Dynamic Performance 59dB SNR at fIN = 20MHz 74dBc SFDR at fIN = 20MHz o Low Power 40mA (Normal Operation) 5µA (Shutdown Mode) o Fully Differential Analog Input o Wide 2VP-P Differential Input Voltage Range o 400MHz -3dB Input Bandwidth o On-Chip 2.048V Precision Bandgap Reference o CMOS-Compatible Three-State Outputs o 32-Pin TQFP Package o Evaluation Kit Available (MAX1448 EV Kit) Features MAX1448 Ordering Information PART MAX1448EHJ TEMP RANGE -40°C to +85°C PIN-PACKAGE 32 TQFP Functional Diagram ________________________Applications Ultrasound Imaging CCD Imaging Baseband and IF Digitization Digital Set-Top Boxes Video Digitizing Applications CLK MAX1448 CONTROL VDD GND IN+ T/H INPIPELINEADC D E C 10 OUTPUT DRIVERS D9–D0 PD REF REFSYSTEM+ BIAS OVDD OGND REFOUT REFIN REFP COM REFN OE Pin Configuration 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 Maxim’s website at www.maxim-ic.com. 10-Bit, 80Msps, Single 3.0V, Low-Power ADC with Internal Reference MAX1448 ABSOLUTE MAXIMUM RATINGS VDD, OVDD to GND ...............................................-0.3V to +3.6V OGND to GND.......................................................-0.3V to +0.3V IN+, IN- to GND........................................................-0.3V to VDD REFIN, REFOUT, REFP, REFN, and COM to GND..........................-0.3V to (VDD + 0.3V) OE, PD, CLK to GND..................................-0.3V to (VDD + 0.3V) D9–D0 to GND.........................................-0.3V to (OVDD + 0.3V) Continuous Power Dissipation (TA = +70°C) 32-Pin TQFP (derate 18.7mW/°C above +70°C)......1495.3mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range ............................-60°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VDD = 3.0V, OVDD = 2V, 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND, VREFIN = 2.048V, REFOUT connected to REFIN through a 10kΩ resistor, VIN = 2VP-P (differential with respect to COM), CL = 10pF at digital outputs, fCLK = 83.3MHz, TA = TMIN to TMAX, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typical values are at TA = +25°C.) PARAMETER DC ACCURACY Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Gain Error ANALOG INPUT Input Differential Range Common-Mode Voltage Range Input Resistance Input Capacitance CONVERSION RATE Maximum Clock Frequency Data Latency DYNAMIC CHARACTERISTICS (fCLK = 83.3MHz, 4096-point FFT) fIN = 7.47MHz Signal-to-Noise Ratio SNR fIN = 20MHz fIN = 39.9MHz (Note 1) Signal-to-Noise + Distortion (Up to 5th Harmonic) fIN = 7.47MHz SINAD fIN = 20MHz fIN = 39.9MHz (Note 1) 55.8 55.3 56.5 56 59.1 59 58.5 59 58.8 58 dB dB fCLK 80 5.5 MHz Cycles VDIFF VCOM RIN CIN Switched capacitor load Differential or single-ended inputs ±1.0 VDD/2 ± 0.5 25 5 V V kΩ pF TA ≥ +25°C INL DNL fIN = 7.47MHz, TA ≥ +25°C fIN = 7.47MHz, no missing codes 10 ±0.7 ±0.4 <±1 0 ±2.2 ±1.0 ±1.7 ±2 Bits LSB LSB %FS %FS SYMBOL CONDITIONS MIN TYP MAX UNITS 2 _______________________________________________________________________________________ 10-Bit, 80Msps, Single 3.0V, Low-Power ADC with Internal Reference ELECTRICAL CHARACTERISTICS (continued) (VDD = 3.0V, OVDD = 2V, 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND, VREFIN = 2.048V, REFOUT connected to REFIN through a 10kΩ resistor, VIN = 2VP-P (differential with respect to COM), CL = 10pF at digital outputs, fCLK = 83.3MHz, TA = TMIN to TMAX, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typical values are at TA = +25°C.) PARAMETER Spurious-Free Dynamic Range SYMBOL fIN = 7.47MHz SFDR fIN = 20MHz fIN = 39.9MHz (Note 1) fIN = 7.47MHz Third-Harmonic Distortion Intermodulation Distortion Two-Tone Third-Order Intermodulation Distortion Total Harmonic Distortion (First 5 Harmonics) Small-Signal Bandwidth Full-Power Bandwidth Aperture Delay Aperture Jitter Overdrive Recovery Time Differential Gain Differential Phase Output Noise INTERNAL REFERENCE Reference Output Voltage Reference Temperature Coefficient Load Regulation REFIN Input Voltage Positive Reference Output Voltage Negative Reference Output Voltage Common-Mode Level Differential Reference Output Voltage Range REFIN Resistance Maximum REFP, COM Source Current REFOUT TCREF 2.048 ±1% 60 1.25 VREFIN VREFP VREFN VCOM ∆VREF RREFIN ISOURCE ∆VREF = VREFP - VREFN, TA ≥ +25°C 0.98 2.048 2.012 0.988 VDD / 2 1.024 >50 5 1.07 V V V V MΩ mA V ppm/°C mV/mA IN+ = IN- = COM FPBW tAD tAJ For 1.5 × full-scale input HD3 fIN = 20MHz fIN = 39.9MHz (Note 1) IMDTT IM3 f1 = 24MHz at -6.5dB FS, f2 = 26MHz at -6.5dB FS (Note 2) f1 = 24MHz at -6.5dB FS, f2 = 26MHz at -6.5dB FS (Note 2) fIN = 7.47MHz THD fIN = 20MHz fIN = 39.9MHz (Note 1) Input at -20dB FS, differential inputs Input at -0.5dB FS, differential inputs CONDITIONS MIN 61 61 TYP 74 74 73 -74 -74 -73 -74 -74 -72 -70 -69 500 400 1 2 2 ±1 ±0.25 0.2 MHz MHz ns psRMS ns % Degrees LSBRMS -60 -60 dBc dBc dBc dBc dBc MAX UNITS MAX1448 BUFFERED EXTERNAL REFERENCE (VREFIN = 2.048V) _______________________________________________________________________________________ 3 10-Bit, 80Msps, Single 3.0V, Low-Power ADC with Internal Reference MAX1448 ELECTRICAL CHARACTERISTICS (continued) (VDD = 3.0V, OVDD = 2V, 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND, VREFIN = 2.048V, REFOUT connected to REFIN through a 10kΩ resistor, VIN = 2VP-P (differential with respect to COM), CL = 10pF at digital outputs, fCLK = 83.3MHz, TA = TMIN to TMAX, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typical values are at TA = +25°C.) PARAMETER Maximum REFP, COM Sink Current Maximum REFN Source Current Maximum REFN Sink Current SYMBOL ISINK ISOURCE ISINK RREFP, RREFN CIN ∆VREF VCOM VREFP VREFN ∆VREF = VREFP - VREFN Measured between REFP and COM and REFN and COM CONDITIONS MIN TYP -250 250 -5 MAX UNITS µA µA mA UNBUFFERED EXTERNAL REFERENCE (VREFIN = AGND, reference voltage applied to REFP, REFN, and COM ) REFP, REFN Input Resistance REFP, REFN, COM Input Capacitance Differential Reference Input Voltage Range COM Input Voltage Range REFP Input Voltage REFN Input Voltage DIGITAL INPUTS (CLK, PD, OE) CLK Input High Threshold VIH PD, OE CLK Input Low Threshold VIL PD, OE Input Hysteresis Input Leakage VHYST IIH IIL VIH = VDD = OVDD VIL = 0 CLK Input Low Threshold VIL PD, OE Input Hysteresis Input Leakage Input Capacitance VHYST IIH IIL CIN VIH = VDD = OVDD VIL = 0 5 0.1 ±5 ±5 0.1 ±5 ±5 0.2 x VDD 0.2 x OVDD V µA pF 0.8 x VDD 0.8 x OVDD 0.2 x VDD 0.2 x OVDD V µA 4 15 1.024 ± 10% VDD / 2 ± 10% VCOM+ ∆VREF / 2 VCOM ∆VREF / 2 kΩ pF V V V V V V V 4 _______________________________________________________________________________________ 10-Bit, 80Msps, Single 3.0V, Low-Power ADC with Internal Reference MAX1448 ELECTRICAL CHARACTERISTICS (continued) (VDD = 3.0V, OVDD = 2V, 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND, VREFIN = 2.048V, REFOUT connected to REFIN through a 10kΩ resistor, VIN = 2VP-P (differential with respect to COM), CL = 10pF at digital outputs, fCLK = 83.3MHz, TA = TMIN to TMAX, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typical values are at TA = +25°C.) PARAMETER DIGITAL OUTPUTS (D9–D0) Output Voltage Low Output Voltage High Three-State Leakage Current Three-