DS8102 Datasheet, PDF(5/9 Page) Maxim Integrated Products – Dual Delta-Sigma Modulator and Encoder

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DS8102 Datasheet, PDF (5/9 Pages) Maxim Integrated Products – Dual Delta-Sigma Modulator and Encoder

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Dual Delta-Sigma Modulator and Encoder

Functional Diagram

APDREF

RST

INTERNAL REFERENCE

REFERENCE BUFFER

VREF

8MHz

OSCILLATOR

CLKSEL

CLKIO

AN1+

1x INTEGRATORS/

DS8102

AN1-

COMPARATOR

DELTA-SIGMA MODULATOR

MANCHESTER

ENCODER

MNOUT

1x, 4x,

AN0+

16x, 32x INTEGRATORS/

AN0-

COMPARATOR

DELTA-SIGMA MODULATOR

POWER

MONITOR

AGND DGND

VDD

Detailed Description

Operating Modes

The DS8102 has two operating modes: shutdown (or

power-down) mode and active mode.

Shutdown Mode

In shutdown mode, the DS8102 is in an inactive state

and consumes a minimal amount of current. No analog-

to-digital conversion or encoding is performed, and the

internal 8MHz oscillator and internal voltage reference

are disabled.

An integrated power-supply monitor holds the DS8102

in shutdown mode whenever VDD â¤ VRST. Additionally,

the RST pin can be driven low by an external compan-

ion microcontroller (such as the MAXQ3108) to force the

DS8102 to remain in shutdown mode, regardless of the

supply level at VDD. This is useful in nonisolated config-

urations (when a power supply is shared between the

DS8102 and the companion microcontroller) to reduce

the current consumption of the entire system. In this

scenario, the companion microcontroller would perform

this sequence of actions when entering stop mode:

1) Drive the RST line on the DS8102 low to force the

DS8102 into shutdown mode.

2) Enter stop mode. Both the companion microcon-

troller and the DS8102 are now in their lowest cur-

rent consumption modes.

3) Exit stop mode.

4) Drive the RST line on the DS8102 high to return the

DS8102 to active mode.

Note: The RST line on the DS8102 does not include

a pullup. This means that if the RST line is not dri-

ven by a companion microcontroller, RST must be

connected to VDD for proper operation. RST cannot

be left unconnected.

While the DS8102 is in shutdown mode, the levels on

the configuration input pins (APDREF, CLKSEL, G1,

and G0) can be changed if they are being driven by a

companion microcontroller instead of hardwired to VDD

or DGND. However, once the DS8102 enters active

mode, the levels on these pins must remain static for

proper operation.

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