SX8722 datasheet(7/108 Pages) SEMTECH

Part #	SX8722

Description	High gain acquisition for sensor interface

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Manufacturer	SEMTECH [Semtech Corporation]

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ACS - Revision 4.2

October 2008

www.semtech.com

Page 7

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

SX8722

High gain acquisition for sensor interface

(1) With external 32.768kHz Xtal connected

(2) Without external 32.768kHz Xtal connected

1.3. ZoomingADC Specifications

Unless otherwise specified: Temperature TA = +25°C, VBATT = +5V, GND = 0V, VREF = +5V, VIN = 0V, RC frequency fRC =

2MHz, sampling frequency fS = 300 kHz, Overall PGA gain GDTOT = 1, offsets GDOff2 = GDOff3 = 0. Power operation: normal

(IB_AMP_ADC[1:0] = IB_AMP_PGA[1:0] = '11'). For resolution n = 12 bits: OSR = 32 and NELCONV = 4. For resolution n = 16

bits: OSR = 512 and NELCONV = 2.

PARAMETER

COMMENTS/CONDITIONS

VALUE

UNITS

MIN

TYP

MAX

ANALOG INPUT CHARACTERISTICS

Differential Input Voltage Range

VIN = VINP -VINN

Gain = 1, OSR = 32 (Note 1)

-2.42

+2.42

V

Gain = 100, OSR = 32

-24.2

+24.2

mV

Gain = 1000, OSR = 32

-2.42

+2.42

mV

Reference Voltage Range

VREF,ADC = VREFP -VREFN

VBATT

V

PROGRAMMABLE GAIN AMPLIFIER

Total PGA Gain

GDTOT

0.5

1000

V/V

PGA1 Gain

GD1

See Table 15

1

10

V/V

PGA2 Gain

GD2

See Table 16

1

10

V/V

PGA3 Gain

GD3

Step = 1/12 V/V, See Table 47

127/12

V/V

Gain Settings Precision (each stage)

-3

+/- 0.5

+3

%

Gain Temperature Dependance Offset

+/- 5

ppm / °C

PGA2 Offset

GDoff2

Step = 0.2 V/V, See Table 46

-1

+1

V/V

PGA3 Offset

GDoff3

Step = 1.12 V/V, See Table 48

-63/12

+63/12

V/V

Offset Settings Precision

(PGA2 or PGA3)

(note 2)

-3

+/- 0.5

+3

%

Offset Temperature Dependance

+/-5

ppm / °C

Input Impedance PGA1

PGA1 Gain = 1 (Note 3)

1500

k

Ω

PGA1 Gain = 10 (Note 3)

150

k

Ω

Input Impedance PGA2 ,PGA3

Maximal gain = 1 (Note 3)

150

k

Ω

Output RMS Noise

PGA1 (Note 4)

205

μV

PGA2 (Note 5)

340

μV

PGA3 (Note 6)

365

μV

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