SX8725SWLTDT 데이터 시트보기 (PDF) - Semtech Corporation

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SX8725SWLTDT

ZoomingADC for sensing data acquisition

Semtech Corporation 

ADVANCED COMMUNICATIONS & SENSING

SX8725S

ZoomingADC for sensing data acquisition

DATASHEET

Table 3. Electrical Characteristics

Parameter

Input leakage current

Symbol

ILeakIn

Comment/Condition

Digital input mode,

no pull-up or pull-down

Min

Typ

Max

Unit

-100

100

nA

VREF: Internal Bandgap Reference

Absolute output voltage

Variation over Temperature

Total Output Noise

VBG

VBGT

VBGN

VBATT > 3V

VBATT > 3V, over Temperature

VBATT > 3V

1.19

1.22

1.25

V

-1.5

+1.5

%

1

mVrms

1. The device can be operated in either active or sleep states. The Sleep state is complete shutdown, but the active state can have a variety of

different current consumptions depending on the settings. Some examples are given here: The Sleep state is the default state after

power-on-reset. The chip can then be placed into an active state after a Slave Select command on SS pin is received.

Table 4. ZoomingADC Specifications

Parameter

ANALOG INPUT CHARACTERISTICS

Differential Input Voltage Range

VIN = VINP-VINN

PROGRAMMABLE GAIN AMPLIFIER

Total PGA Gain

PGA1 Gain

PGA2 Gain

PGA3 Gain

Gain Settings Precision (each stage)

Gain Temperature Dependence

PGA2 Offset

PGA3 Offset

Offset Settings Precision

(PGA2 or PGA3)

Offset Temperature Dependence

Input Impedance on ADC

Input Impedance on PGA1

(see section 11.1, page 49)

Input Impedance on PGA2

Input Impedance on PGA3

Symbol

Condition

Gain=1, OSR=32, VREF=5V. Note 1

Gain=100, OSR=32, VREF=5V

Gain=1000, OSR=32, VREF=5V

GDTOT

GD1

GD2

GD3

Note 1

(see Table 10, page 22)

(see Table 11, page 22)

Step = 1/12 V/V

(see Table 12, page 22)

Gain ≥ 1

GDOFF2

GDOFF3

Step = 0.2 V/V

(see Table 11, page 22)

Step = 1/12 V/V

(see Table 12, page 22)

Note 2

ZINADC

ZINPGA1

ZINPGA2

ZINPGA3

Gain = 1. Note 3

Gain = 10. Note 3

Gain = 1. Note 3

Gain = 10. Note 3

Gain = 1. Note 3

Gain = 10. Note 3

Min

-2.42

-24.2

-2.42

1/12

1

1

1/12

-3

-1

-63/12

-3

500

900

250

500

125

500

125

Typ

±0.5

±5

±0.5

±5

1150

350

1000

270

780

190

Max

Unit

+2.42

V

+24.2

mV

+2.42

mV

1000

10

10

127/12

+3

+1

V/V

V/V

V/V

V/V

%

ppm / °C

V/V

+63/12

V/V

+3

%

ppm / °C

kΩ

kΩ

kΩ

kΩ

kΩ

kΩ

kΩ

Revision 1.0

© Semtech

February 2011

Page 6

www.semtech.com

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