MAX1153_10 datasheet(11/30 Pages) MAXIM

11 / 30 page

Stand-Alone, 10-Channel, 10-Bit System Monitors

with Internal Temperature Sensor and VDD Monitor

______________________________________________________________________________________

During the acquisition interval, IN+ and IN- charge both

a positive (CHOLDP) and a negative (CHOLDN) sam-

pling capacitor. After completing the acquisition inter-

val, the T/H switches open, storing an accurate sample

of the differential voltage between IN+ and IN-. This

charge is then transferred to the ADC and converted.

Finally, the conversion result is transferred to the cur-

rent data register.

Temperature conversions require 46µs (typ) and mea-

sure the difference between two sequential voltage

measurements (see the

Temperature Measurement

section for a detailed description).

Fully Differential Track/Hold (T/H)

The T/H acquisition interval begins with the rising edge

of CS (for manually triggered conversions) and is inter-

nally timed to 1.5µs (typ). The accuracy of the input sig-

nal sample is a function of the input signal’s source

impedance and the T/H’s capacitance. In order to

achieve adequate settling of the T/H, limit the signal

source impedance to a maximum of 1k

Ω.

Input Bandwidth

The ADC’s input tracking circuitry has a 1MHz small-

signal bandwidth. To avoid high-frequency signals

aliasing into the frequency band of interest, anti-alias

prefiltering of the input signals is recommended.

Analog Input Protection

Internal protection diodes, which clamp the analog

inputs to VDD and GND, allow the channel input pins to

swing from (VGND - 0.3V) to (VDD + 0.3V) without dam-

age. However, for accurate conversions near full scale,

the inputs must not exceed VDD by more than 50mV or

be lower than VGND by 50mV. If the analog input range

must exceed 50mV beyond the supplies, limit the input

current.

Single Ended/Differential

The MAX1153/MAX1154 use a fully differential ADC for

all conversions. Through the input configuration regis-

ter, the analog inputs can be configured for either dif-

ferential or single-ended conversions. When sampling

signal sources close to the MAX1153/MAX1154, single-

ended conversion is generally sufficient. Single-ended

conversions use only one analog input per signal

source, internally referenced to GND.

MUX

AIN 0

VDD

AIN 1

AIN 2

AIN 3

AIN 4

AIN 5

AIN 6

AIN 7

TEMP

SENSE

12-BIT

ADC WITH T/H

DIGITAL

COMPARATOR

INPUT REGISTERS 0–10

CURRENT DATA

UPPER THRESHOLD

LOWER THRESHOLD

# FAULT CYCLES

AVERAGE

CONFIGURATION/

STATUS

REGISTERS

SCAN AND

CONVERSION

CONTROL

SERIAL

INTERFACE

DIN

INT

DOUT

SCLK

Figure 3. Simplified Alarm Block Diagram of the MAX1153/MAX1154

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