SX8723C 데이터 시트보기 (PDF) - Semtech Corporation

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SX8723C

ZoomingADC for sensing data acquisition

Semtech Corporation 

SX8723C

ZoomingADC for sensing data acquisition

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

6 General Description

The SX8723C is a complete low-power acquisition path with programmable gain, acquisition speed and resolution.

6.1 Bloc diagram

SX8723C

+

-

+

+

VREF -

-

AC0

AC1

AC2

AC3

AC4

AC5

PGA

ZoomingADCTM

ADC

VBATT

READY

D0

(1)

D1

CONTROL LOGIC

GPIO

CHARGE

PUMP

4MHz

OSC

I2C

SCL

SDA

VPUMP

VSS

(1)

D0: digital IO, Vref output or I2C address select

D1: digital IO, Vref input or I2C address select

Figure 3. SX8723C bloc diagram

6.2 VREF

The internally generated VREF is a trimmed bandgap reference with a nominal value of 1.22V that provides a stable

voltage reference for the ZoomingADC.

This reference voltage is directly connected to one of the ZoomingADC reference multiplexer inputs.

The bandgap voltage stability is only guaranteed for VBATT voltages of 3V and above. As VBATT drops down to 2.4V, the

bandgap voltage could reduce by up to 50mV.

The bandgap has relatively weak output drive so it is recommended that if the bandgap is required as a signal input

then PGA1 must be enabled with gain = 1.

Revision 1.01

© Semtech

January 2011

Page 14

www.semtech.com/products/

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