ADS1204

SBAS301A − OCTOBER 2003 − REVISED JUNE 2004

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4

ELECTRICAL CHARACTERISTICS (continued)

Over recommended operating free-air temperature range at −40

°C to +85°C, AVDD = 5V, BVDD = 3V, CH x+ = 0.5V to 4.5V, CH x− = 2.5V,

REFIN = REFOUT = internal +2.5V, CLKIN = 20MHz, and 16-bit Sinc3 filter with decimation by 256, unless otherwise noted.

PARAMETER

UNITS

ADS1204I

TEST CONDITIONS

PARAMETER

UNITS

MAX

TYP(1)

MIN

TEST CONDITIONS

Voltage Reference Output

VOUT

Reference voltage output

−40

°C to +85°C

2.450

2.5

2.550

V

dVOUT/dT

Output voltage temperature drift

±20

ppm/

°C

Output voltage noise

f = 0.1Hz to 10Hz, CL = 10µF

10

µVrms

Output voltage noise

f =10Hz to 10kHz, CL = 10µF

12

µVrms

PSRR

Power-supply rejection ratio

60

dB

IOUT

Output current

10

µA

ISC

Short-circuit current

0.5

mA

Turn-on settling time

to 0.1% at CL = 0

100

µs

Voltage Reference Input

VIN

Reference voltage input

0.5

2.5

2.6

V

Reference input resistance

100

M

Ω

Reference input capacitance

5

pF

Reference input current

1

µA

Digital Inputs(5)

Logic family

CMOS with Schmitt Trigger

VIH

High-level input voltage

0.7

×BVDD

BVDD+0.3

V

VIL

Low-level input voltage

−0.3

0.3

×BVDD

V

IIN

Input current

VI = BVDD or GND

±50

nA

CI

Input capacitance

5

pF

Digital Outputs(5)

Logic family

CMOS

VOH

High-level output voltage

BVDD = 4.5V, IOH = −100µA

4.44

V

VOL

Low-level output voltage

BVDD = 4.5V, IOL = +100µA

0.5

V

CO

Output capacitance

5

pF

CL

Load capacitance

30

pF

Data format

Bit Stream

(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 CH x+ = −2V to +2V at 2.5V, expressed either as the number of LSBs or as a percent of measured input range (4V).

(3) Ensured by design.

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

(5) Applicable for 5.0V nominal supply: BVDD (min) = 4.5V and BVDD (max) = 5.5V.

(6) Applicable for 3.0V nominal supply: BVDD (min) = 2.7V and BVDD (max) = 3.6V.