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General Description

The MAX155/MAX156 are high-speed, 8-bit, multichan-

nel analog-to-digital converters (ADCs) with simultaneous

track/holds (T/Hs) to eliminate timing differences between

input channel samples. The MAX155 has 8 analog input

channels and the MAX156 has 4 analog input channels.

Each channel has its own T/H, and all T/Hs sample at the

same instant. The ADC converts a channel in 3.6µs and

stores the result in an internal 8x8 RAM. The MAX155/

MAX156 also feature a 2.5V internal reference and

power-down capability, providing a complete, sampling

data-acquisition system.

When operating from a single +5V supply, the MAX155/

MAX156 perform either unipolar or bipolar, single-ended

or differential conversions. For applications requiring

wider dynamic range or bipolar conversions around

ground, the V

supply pin may be connected to -5V.

Conversions are initiated with a pulse to the WR pin, and data

is accessed from the ADC’s 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

output-only operation.The MAX155 comes in 28-pin PDIP

and wide SO packages, and the MAX156 comes in 24-pin

narrow PDIP and 28-pin wide SO packages.

Features

● 8 Simultaneously Sampling Track/Hold Inputs

● 3.6µs Conversion Time Per Channel

● Unipolar or Bipolar Input Range

● Single-Ended or Differential Inputs

● Mixed Input Configurations Possible

● 2.5V Internal Reference

● Single +5V or Dual ±5V Supply Operation

Applications

● Phase-Sensitive Data Acquisition

● Vibration and Waveform Analysis

● DSP Analog Input

● AC Power Meters

● Portable Data Loggers

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer

to www.maximintegrated.com/MAX155.related.

AIN0

AIN1

T/H

8-BIT

A/D

3.6µs

2.5V

REF

8 x 8

RAM

CONTROL

LOGIC

THREE-

STATE

BUFFER

T/H

AIN2

T/H

AIN3

T/H

AIN4

T/H

AIN5

T/H

AIN6

T/H

AIN7

T/H

8 8

MODE

CLK

REFIN

REFOUT

8-BIT

DATA

BUS

MAX155

MAX155/MAX156 8-/4-Channel ADCs with Simultaneous

T/Hs and Reference

19-2949; Rev 2; 1/12

Functional Diagram

EVALUATION KIT AVAILABLE

to AGND ............................................................. -0.3V, +6V

to DGND ............................................................. -0.3V, +6V

AGND to DGND ...........................................-0.3V, (V

+ 0.3V)

to AGND.............................................................. +0.3V, -6V

to DGND ............................................................. +0.3V, -6V

CS, WR, RD, CLK, MODE to DGND ...........-0.3V, (V

+ 0 3V)

BUSY, D0–D7 to DGND ...............................-0.3V, (V

+ 0 3V)

REFOUT to AGND .......................................-0.3V, (V

+ 0 3V)

REFIN to AGND ...........................................-0.3V, (V

+ 0 3V)

AIN to AGND .................................... (V

- 0.3V), (V

+ 0 3V)

Output Current (REFOUT) .................................................30mA

Continuous Power Dissipation (T

= +70°C)

24-Pin PDIP (derate 8.7mW/°C above +70°C) ............696mW

28-Pin PDIP (derate 9.09mW/°C above +70°C) ..........727mW

28-Pin Wide SO (derate 12.5mW/°C above +70°C) ..1000mW

Operating Temperature Ranges:

MAX155/MAX156_C_ _ ......................................0°C to +70°C

MAX155/MAX156_E_ _ .................................. -40°C to +85°C

Storage Temperature Range ............................ -65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow) .......................................+260°C

= +5V, V

REFIN

= +2.5V. External Reference, V

AGND

= V

DGND

= 0V, V

= 0V or -5V, f

CLK

= 5MHz external, Unipolar range

single-ended mode, T

= T

MIN

to T

MAX

, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ACCURACY (Note 1)

Resolution 8 Bits

Integral Linearity Error

MAX15_A ±½

LSB

MAX15_B ±1

No Missing Codes Resolution Guaranteed monotonic 8 Bits

Offset Error (Unipolar)

MAX15_A ±½

LSB

MAX15_B ±1

Offset Error (Bipolar)

MAX15_A ±1

LSB

MAX15_B ±2

Gain Error

Unipolar

MAX15_A ±1

LSB

MAX15_B ±1

Bipolar

MAX15_A ±1

MAX15_B ±2

Channel-to-Channel Matching

MAX15_A ±½

LSB

MAX15_B ±1

DYNAMIC PERFORMANCE (V

= 50kHz, 2.5V

P-P

sine wave sampled at 220ksps)

Signal-to-Noise and Distortion

Ratio

SINAD

MAX15_A 48

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

MAX155/MAX156 8-/4-Channel ADCs with Simultaneous

T/Hs and Reference

www.maximintegrated.com

Maxim Integrated

│

Absolute Maximum Ratings

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