EVALUATION KIT AVAILABLE MAX155/MAX156 8-/4-Channel ADCs with Simultaneous T/Hs and Reference General Description Features The MAX155/MAX156 are high-speed, 8-bit, multichan- 8 Simultaneously Sampling Track/Hold Inputs nel analog-to-digital converters (ADCs) with simultaneous 3.6s Conversion Time Per Channel track/holds (T/Hs) to eliminate timing differences between Unipolar or Bipolar Input Range input channel samples. The MAX155 has 8 analog input channels and the MAX156 has 4 analog input channels. Single-Ended or Differential Inputs Each channel has its own T/H, and all T/Hs sample at the Mixed Input Configurations Possible same instant. The ADC converts a channel in 3.6s and 2.5V Internal Reference stores the result in an internal 8x8 RAM. The MAX155/ Single +5V or Dual 5V Supply Operation MAX156 also feature a 2.5V internal reference and power-down capability, providing a complete, sampling Applications data-acquisition system. Phase-Sensitive Data Acquisition When operating from a single +5V supply, the MAX155/ Vibration and Waveform Analysis MAX156 perform either unipolar or bipolar, single-ended DSP Analog Input or differential conversions. For applications requiring AC Power Meters wider dynamic range or bipolar conversions around Portable Data Loggers ground, the V supply pin may be connected to -5V. SS Conversions are initiated with a pulse to the WR pin, and data Ordering Information appears at end of data sheet. is accessed from the ADCs RAM with a pulse to the RD pin. A bidirectional interface updates the channel configuration and provides output data. The ADC may also be wired for For related parts and recommended products to use with this part, refer output-only operation.The MAX155 comes in 28-pin PDIP to www.maximintegrated.com/MAX155.related. and wide SO packages, and the MAX156 comes in 24-pin narrow PDIP and 28-pin wide SO packages. Functional Diagram MAX155 AIN0 T/H CLK AIN1 T/H 8-BIT REFIN A/D AIN2 T/H 3.6s REFOUT 2.5V AIN3 V T/H REF 8 8-BIT AIN4 DATA T/H 8 THREE- 8 8 BUS 8 x 8 AIN5 STATE T/H RAM BUFFER AIN6 T/H AIN7 T/H CS RD CONTROL 8 LOGIC WR MODE 19-2949 Rev 2 1/12MAX155/MAX156 8-/4-Channel ADCs with Simultaneous T/Hs and Reference Absolute Maximum Ratings V to AGND ............................................................. -0.3V, +6V Continuous Power Dissipation (T = +70C) DD A V to DGND ............................................................. -0.3V, +6V 24-Pin PDIP (derate 8.7mW/C above +70C) ............696mW DD AGND to DGND ...........................................-0.3V, (V + 0.3V) 28-Pin PDIP (derate 9.09mW/C above +70C) ..........727mW DD V to AGND.............................................................. +0.3V, -6V 28-Pin Wide SO (derate 12.5mW/C above +70C) ..1000mW SS V to DGND ............................................................. +0.3V, -6V Operating Temperature Ranges: SS CS, WR, RD, CLK, MODE to DGND ...........-0.3V, (V + 0 3V) MAX155/MAX156 C ......................................0C to +70C DD BUSY, D0D7 to DGND ...............................-0.3V, (V + 0 3V) MAX155/MAX156 E .................................. -40C to +85C DD REFOUT to AGND .......................................-0.3V, (V + 0 3V) Storage Temperature Range ............................ -65C to +150C DD REFIN to AGND ...........................................-0.3V, (V + 0 3V) Lead Temperature (soldering, 10s) .................................+300C DD AIN to AGND ....................................(V - 0.3V), (V + 0 3V) Soldering Temperature (reflow) .......................................+260C SS DD Output Current (REFOUT) .................................................30mA 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 = +5V, V = +2.5V. External Reference, V = V = 0V, V = 0V or -5V, f = 5MHz external, Unipolar range DD REFIN AGND DGND SS CLK single-ended mode, T = T to T , unless otherwise noted.) A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ACCURACY (Note 1) Resolution 8 Bits MAX15 A Integral Linearity Error LSB MAX15 B 1 No Missing Codes Resolution Guaranteed monotonic 8 Bits MAX15 A Offset Error (Unipolar) LSB MAX15 B 1 MAX15 A 1 Offset Error (Bipolar) LSB MAX15 B 2 MAX15 A 1 Unipolar MAX15 B 1 Gain Error LSB MAX15 A 1 Bipolar MAX15 B 2 MAX15 A Channel-to-Channel Matching LSB MAX15 B 1 DYNAMIC PERFORMANCE (V = 50kHz, 2.5V sine wave sampled at 220ksps) IN P-P MAX15 A 48 Signal-to-Noise and Distortion SINAD dB Ratio MAX15 B 47 Total Harmonic Distortion THD -60 dB Spurious-Free Dynamic Range SFDR -62 dB Small-Signal Bandwidth 4 MHz Aperture Delay 20 ns Aperture Delay Matching (Note 2) 4 ns Maxim Integrated 2 www.maximintegrated.com