ADS1205

SBAS312A − JANUARY 2005 − REVISED APRIL 2005

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5

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

ADS1205I

TEST CONDITIONS

PARAMETER

UNITS

MAX

TYP(1)

MIN

TEST CONDITIONS

Digital Inputs(7)

Logic family

LVCMOS

VIH

High-level input voltage

BVDD = 3.6V

2

BVDD+0.3

V

VIL

Low-level input voltage

BVDD = 2.7V

−0.3

0.8

V

IIN

Input current

VI = BVDD or GND

±50

nA

CI

Input capacitance

5

pF

Digital Outputs(7)

Logic family

LVCMOS

VOH

High-level output voltage

BVDD = 2.7V, IOH = −100µA

BVDD−0.2

V

VOL

Low-level output voltage

BVDD = 2.7V, IOL = +100µA

0.2

V

CO

Output capacitance

5

pF

CL

Load capacitance

30

pF

Data format

Bit Stream

Power Supply

AVDD

Analog supply voltage

4.5

5.5

V

BVDD

Buffer I/O supply voltage

Low-voltage levels

2.7

3.6

V

BVDD

Buffer I/O supply voltage

5V logic levels

4.5

5.5

V

AIDD

Analog operating supply current

CLKSEL = 1

11.8

16

mA

AIDD

Analog operating supply current

CLKSEL = 0

11.4

15.5

mA

BIDD

Buffer I/O operating supply current

BVDD = 3V, CLKOUT = 10MHz

2

mA

BIDD

Buffer I/O operating supply current

BVDD = 5V, CLKOUT = 10MHz

2

mA

Power dissipation

CLKSEL = 0

57

77.5

mW

Power dissipation

CLKSEL = 1

59

80

mW

(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) With reduced accuracy, the clock frequency can go from 1MHz to 33MHz.

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

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

EQUIVALENT INPUT CIRCUIT

R

ON

650

Ω

C

(SAMPLE)

1pF

BV

DD

D

IN

BGND

AV

DD

A

IN

AGND

Diode Turn−On Voltage: 0.35V

Equivalent Digital Input Circuit

Equivalent Analog Input Circuit