PGA309

SBOS292A − DECEMBER 2003 − REVISED AUGUST 2004

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5

ELECTRICAL CHARACTERISTICS (continued)

TA = +25°C, VSA = VSD = +5V (VSA = VSUPPLY ANALOG, VSD = VSUPPLY DIGITAL; VSA must equal VSD), GNDD = GNDA = 0, and VREF = REFIN/REFOUT = +5V,

unless otherwise noted.

PGA309

PARAMETER

UNITS

MAX

TYP

MIN

CONDITIONS

INTERNAL VOLTAGE REFERENCE

VREF1

Register 3, Bit D9 = 1

2.46

2.5

2.53

V

VREF1 Drift vs Temperature

+10

ppm/

°C

VREF2

Register 3, Bit D9 = 0

4.0

4.096

4.14

V

VREF2 Drift vs Temperature

+10

ppm/

°C

Input Current REFIN/REFOUT

Internal VREF Disabled

100

µA

Output Current REFIN/REFOUT

VSA > 2.7V for VREF = 2.5V

1

mA

VSA > 4.3V for VREF = 4.096V

1

mA

TEMPERATURE SENSE CIRCUITRY (ADC)

Internal Temperature Measurement

Register 6, Bit D9 = 1

Accuracy

±2

°C

Resolution

12-Bit + Sign, Two’s Complement Data Format

±0.0625

°C

Temperature Measurement Range

−55

+150

°C

Conversion Rate

R1, R0 = ‘11’, 12-Bit + Sign Resolution

24

ms

TEMPERATURE ADC

External Temperature Mode

Temp PGA + Temp ADC

Gain Range Steps

GPGA = 1, 2, 4, 8

1 to 8

V/V

Analog Input Voltage Range

GND−0.2

VSA+0.2

V

Temperature ADC Internal REF (2.048V)

Register 6, Bit D8 = 1

Full-Scale Input Voltage

(+Input) − (−Input)

±2.048/GPGA

V

Differential Input Impedance

2.8/GPGA

M

Ω

Common-Mode Input Impedance

3.5

M

Ω

3.5

M

Ω

1.8

M

Ω

0.9

M

Ω

Resolution

R1, R0 = ‘00’, ADC2X = ‘0’, Conversion Time = 8ms

11

Bits + Sign

R1, R0 = ‘01’, ADC2X = ‘0’, Conversion Time = 32ms

13

Bits + Sign

R1, R0 = ‘10’, ADC2X = ‘0’, Conversion Time = 64ms

14

Bits + Sign

R1, R0 = ‘11’, ADC2X = ‘0’, Conversion Time = 128ms

15

Bits + Sign

Integral Nonlinearity

0.004

%

Offset Error

1.2

mV

0.7

mV

0.5

mV

0.4

mV

Offset Drift

1.2

µV/°C

0.6

µV/°C

0.3

µV/°C

0.3

µV/°C

Offset vs VSA

800

µV/V

400

µV/V

200

µV/V

150

µV/V

Gain Error

0.05

0.50

%

Gain Error Drift

5

50

ppm/

°C

Noise

All Gains

< 1

LSB

Gain vs VSA

80

ppm/V

Common-Mode Rejection

105

dB

100

dB