MAX1195 19-2410 Rev 0 4/02 Dual, 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs General Description Features The MAX1195 is a 3V, dual, 8-bit analog-to-digital con- Single 2.7V to 3.6V Operation verter (ADC) featuring fully differential wideband track- Excellent Dynamic Performance and-hold (T/H) inputs, driving two ADCs. The MAX1195 48.5dB/46.7dB SINAD at f = 20MHz/200MHz IN is optimized for low-power, small size, and high-dynamic 68.7dBc/55.7dBc SFDR at f = 20MHz/200MHz IN performance for applications in imaging, instrumentation and digital communications. This ADC operates from a -72dB Interchannel Crosstalk at f = 20MHz IN single 2.7V to 3.6V supply, consuming only 87mW while Low Power delivering a typical signal-to-noise and distortion (SINAD) 87mW (Normal Operation) of 48.5dB at an input frequency of 20MHz and a sam- 9mW (Sleep Mode) pling rate of 40Msps. The T/H-driven input stages incor- 0.3W (Shutdown Mode) porate 400MHz (-3dB) input amplifiers. The converters 0.05dB Gain and 0.05 Phase Matching may also be operated with single-ended inputs. In addi- tion to low operating power, the MAX1195 features a Wide 1V Differential Analog Input Voltage P-P 3mA sleep mode as well as a 0.1A power-down mode Range to conserve power during idle periods. 400MHz -3dB Input Bandwidth An internal 2.048V precision bandgap reference sets On-Chip 2.048V Precision Bandgap Reference the full-scale range of the ADC. A flexible reference structure allows the use of this internal or an externally User-Selectable Output FormatTwos applied reference, if desired, for applications requiring Complement or Offset Binary increased accuracy or a different input voltage range. Pin-Compatible 8-Bit and 10-Bit Upgrades The MAX1195 features parallel, CMOS-compatible three- Available state outputs. The digital output format can be set to twos complement or straight offset binary through a single con- Ordering Information trol pin. The device provides for a separate output power supply of 1.7V to 3.6V for flexible interfacing with various PART TEMP RANGE PIN-PACKAGE logic families. The MAX1195 is available in a 7mm x 7mm, MAX1195ECM -40C to +85C 48 TQFP-EP* 48-pin TQFP package, and is specified for the extended *EP = Exposed paddle industrial (-40C to +85C) temperature range. Functional Diagram and Pin Compatible Upgrades table Pin-compatible higher speed versions of the MAX1195 appear at end of data sheet. are also available. Refer to the MAX1197 data sheet for Pin Configuration 60Msps and the MAX1198 data sheet for 100Msps. In addition to these speed grades, this family will include a multiplexed output version (MAX1196, 40Msps), for which digital data is presented time interleaved and on a single, parallel 8-bit output port. For a 10-bit, pin-compatible upgrade, refer to the COM 1 36 N.C. MAX1183 data sheet. With the N.C. pins of the MAX1195 V 2 35 N.C. DD internally pulled down to ground, this ADC becomes a GND 3 34 OGND drop-in replacement for the MAX1183. INA+ 4 33 OV DD INA- 5 32 OV DD V 6 31 OGND Applications DD MAX1195 GND N.C. 7 30 Baseband I/Q Sampling WLAN, WWAN, WLL, INB- 8 29 N.C. MMDS Modems INB+ 9 28 D0B Multichannel IF Sampling GND D1B 10 27 Set-Top Boxes Ultrasound and Medical V 11 26 D2B DD Imaging VSAT Terminals CLK 12 25 D3B Battery-Powered Instrumentation TQFP-EP 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. GND 13 REFN 48 V 14 47 REFP DD V 15 REFIN 46 DD GND 16 REFOUT 45 T/B 17 44 D7A SLEEP 18 D6A 43 PD 19 D5A 42 OE 20 41 D4A D7B 21 D3A 40 D6B 22 D2A 39 D5B 23 38 D1A D4B 24 D0A 37Dual, 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs ABSOLUTE MAXIMUM RATINGS V , OV to GND ...............................................-0.3V to +3.6V Continuous Power Dissipation (T = +70C) DD DD A OGND to GND.......................................................-0.3V to +0.3V 48-Pin TQFP (derate 12.5mW/C above +70C).........1000mW INA+, INA-, INB+, INB- to GND ...............................-0.3V to V Operating Temperature Range ...........................-40C to +85C DD REFIN, REFOUT, REFP, REFN, Junction Temperature......................................................+150C COM, CLK to GND .................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD OE, PD, SLEEP, T/B, D7AD0A, Lead Temperature (soldering, 10s) .................................+300C D7BD0B to OGND .............................-0.3V to (OV + 0.3V) DD 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 = OV = 3V, 0.1F and 2.2F capacitors from REFP, REFN, and COM to GND REFOUT connected to REFIN through a 10k DD DD resistor, V = 2V (differential with respect to COM), C = 10pF at digital outputs, f = 40MHz, T = T to T , unless IN P-P L CLK A MIN MAX otherwise noted. +25C guaranteed by production test, <+25C guaranteed by design and characerization. Typical values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TY P MAX UNITS DC ACCURACY Resolution 8 Bits Integral Nonlinearity INL f = 7.51MHz (Note 1) 0.3 1 LSB IN f = 7.51MHz, no missing codes IN Differential Nonlinearity DNL 0.15 1 LSB guaranteed (Note 1) Offset Error 4%FS Gain Error 4%FS Gain Temperature Coefficient 100 ppm/C ANALOG INPUT Differential Input Voltage Range V Differential or single-ended inputs 1.0 V DIFF Common-Mode Input Voltage V / 2 D D V V CM Range 0.2 Input Resistance R Switched capacitor load 140 k IN Input Capacitance C 5pF IN CONVERSION RATE Maximum Clock Frequency f 40 MHz CLK Clock Data Latency 5 Cycles DYNAMIC CHARACTERISTICS (f = 40MHz, 4096-point FFT) CLK f = 1MHz at -1dB FS 48.7 INA or B f = 7.5MHz at -1dB FS 48.7 INA or B Signal-to-Noise Ratio SNR dB f = 20MHz at -1dB FS 47.5 48.6 INA or B f = 115.1MHz at -1dB FS 48.0 INA or B 2 MAX1195