ADS1203

SBAS318 − JUNE 2004

www.ti.com

3

ELECTRICAL CHARACTERISTICS

Over recommended operating free-air temperature range at −40

°C to +85°C, VDD = +5V, VIN+ = −250mV to +250mV, VIN− = 0V, Mode 3,

MCLK input = 20MHz, and 16-bit Sinc3 filter, with OSR = 256, unless otherwise noted.

ADS1203IPW

PARAMETER

TEST CONDITIONS

MIN

TYP(1)

MAX

UNITS

Resolution

16

Bits

DC Accuracy

INL

Integral linearity error(2)

±1

±3

LSB

INL

Integral linearity error(2)

0.001

0.005

%

DNL

Differential nonlinearity(3)

±1

LSB

VOS

Input offset

−220

±1000

µV

TCVOS

Input offset drift

3.5

8

µV/°C

GERR

Gain error(4)

−0.2

±1

%

TCGERR

Gain error drift

20

ppm/

°C

PSRR

Power-supply rejection ratio

4.75V < VDD < 5.25V

80

dB

Analog Input

FSR

Full-scale differential range

(VIN+) − (VIN−)

±320

mV

Operating common-mode signal(3)

−0.1

5

V

Input capacitance

Common-mode

3

pF

Input leakage current

±1

nA

Differential input resistance

Equivalent

28

k

Ω

Differential input capacitance

5

pF

CMRR

Common-mode rejection ratio

At DC

92

dB

CMRR

Common-mode rejection ratio

VIN = 0V to 5V at 50kHz

105

dB

Internal Voltage Reference

VOUT

Reference voltage output

Scale to 320mV

2.475

2.5

2.525

V

Accuracy

Scale to 320mV

±1

%

dVOUT/dT

Reference temperature drift

±20

ppm/

°C

PSRR

Power-supply rejection ratio

80

dB

Startup time

to 0.1% at CL = 0

0.1

ms

Internal Clock for Modes 0, 1, and 2

Clock frequency

9

10

11

MHz

External Clock for Mode 3

Clock frequency(5)

16

20

24

MHz

AC Accuracy

SINAD

Signal-to-noise + distortion

VIN = ±250mVPP at 5kHz

82.5

85

dB

SNR

Signal-to-noise ratio

VIN = ±250mVPP at 5kHz

83

85

dB

THD

Total harmonic distortion

VIN = ±250mVPP at 5kHz

−95

−88

dB

SFDR

Spurious-free dynamic range

VIN = ±250mVPP at 5kHz

90

95

dB

(1) All typical values are at TA = +25°C.

(2) Integral nonlinearity is defined as the maximum deviation of the line through the end points of the specified input range of the transfer curve

for VIN+ = −250mV to +250mV, expressed either as the number of LSBs or as a percent of measured input range (500mV).

(3) Ensured by design.

(4) Maximum values, including temperature drift, are ensured over the full specified temperature range.

(5) With reduced accuracy, minimum clock can go from 1MHz up to 32MHz.