Detailed Description

________________________of Hardware

U1, the MAX1110, is an 8-channel, 8-bit, low-power

analog-to-digital converter (ADC) with serial interface

and a shutdown mode. R1–R8 and C1–C8 act as anti-

ply rails. Refer to the MAX1110 data sheet for additional

information.

C9 and C11 are 4.7µF bypass capacitors for the refer-

ence and the power supply. For reduced board size

and/or lower cost, C9 and C11 may be reduced to 1µF.

R9 and C10 filter the digital noise out of the analog

power supply.

Input Filtering

The EV kit has an RC filter on each input with a time con-

stant of approximately 100µs (R = 10k

Ω, C = 0.01µF).

Acquisition time with a 500kHz clock is 4µs. The RC fil-

ter’s settling time may increase the acquisition time

required for full accuracy when switching input channels.

MAX1110 Evaluation System/

Evaluation Kit

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3

JUMPER

STATE

FUNCTION

open

Use an external user-supplied refer-

ence.

closed

Use the internal reference (REFIN is

connected to REFOUT).

open

Analog common voltage must be set

by user.

closed

Analog common (COM) = GND.

open

MAX1110 is active with internal

reference enabled.

1–2

internal reference disabled.

open

SHDN is allowed to float or be driven

by JU4.

closed

SHDN is driven by the µC module.

2–3

SHDN = GND; MAX1110 is inactive.

closed

Current-sense jumper. The MAX1110

draws its power through this trace.

open

Do not operate kit with JU5 open.

JU1

JU2

JU3

JU5

JUMPER

STATE

FUNCTION

JU1

closed

Use the internal reference (REFIN is

connected to REFOUT).

closed

COM = GND.

JU2

JU3

JU4

open

SHDN is allowed to float or be driven

by JU4.

open

MAX1110 is active with internal refer-

ence enabled.

JU5

closed

The MAX1110 draws its power through

this trace.

Table 1. Jumper Functions

Table 2. Default Jumper Settings

JU4