Maxim

MAX155 - 8-Channel, 8-Bit ADC with Track/Hold (28 pin SMD)

Photograph

Features 8 Simultaneously Sampling Track/Hold Inputs 3.6µs Conversion Time per Channel Unipolor or Bipolar Input Range Single-Ended or Differential Inputs Mixed Input Configurations Possible +2.5V Internal Reference Single +5V or Dual ±5V Supply Operation

Pin Description Pin Number Description 1 AIN3-Sampling Analog Input .channel 3 2 AIN2-Sampling Analog Input .channel 2 3 AIN1-Sampling Analog Input .channel 1 4 AIN0-Sampling Analog Input .channel 0 5 MODE-Mode configures multiplexer 6 VSS-Negative Supply 7 CS-CHIP SELECT Input 8 RD-READ Input reads data sequentially 9 WR-WRITE Inputs 10 BUSY-BUSY Output Low Conversion 11 CLK-External Clock Input 12 D7/ALL-Three-State Data Output Bit 7(MSB)/Sequential or Specific Conversion 13 D6/D4FF-Three-State Data Output Bit 6/Single-Ended/Differential Select 14 DGND-Digital Ground 15 D5/BIP-Three/State Data Output Bit 5/Unipolar/Bipolar Conversion 16 D4/INH-Three-State Data Output Bit 4/Inhbit Conversion Input 17 D3/PD-Three-State Data Output Bit 3/Power-Down Input 18 D2/A2-Three-State Data Output Bit 2/RAM Address Bit A2 (MAX 155 only) 19 D1/A1-Three-State Data Output Bit 1/RAM Address Bit A1 20 D0/A0-Three-State Data Output Bit 0/RAM Address Bit 0 21 REFOUT-Reference Output ,+2.5V 22 REFIN-Reference Input , +2.5V normally 23 AGND-Analog Ground 24 VDD-Power-Supply Voltage ,+5V normally 25 AIN7-4-Sampling Analog Input ,Channels 7-4 26 AIN7-4-Sampling Analog Input ,Channels 7-4 27 AIN7-4-Sampling Analog Input ,Channels 7-4 28 AIN7-4-Sampling Analog Input ,Channels 7-4

Pin Layout Dimensional Drawing

Technical Data Data Sheet Maxim - Data Sheet for MAX155 Application Notes