ADS5270

SBAS293D − JANUARY 2004 − REVISED MAY 2004

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3

ELECTRICAL CHARACTERISTICS

TMIN = −40°C, and TMAX = +85°C. Typical values are at TA = 25°C, clock frequency = maximum specified, 50% clock duty cycle, AVDD = 3.3V,

LVDD = 3.3V, −1dBFS, internal voltage reference, and LVDS buffer current at 3.5mA per channel, unless otherwise noted.

ADS5270

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

DC ACCURACY

No Missing Codes

Assured

DNL

Differential Nonlinearity

−0.9

±0.5

0.9

LSB

INL

Integral Nonlinearity

−2.0

±0.6

2.0

LSB

−0.75

±0.2

0.75

%FS

Offset Temperature Coefficient

14

ppm/

°C

1

%FS

±0.2

%FS

−2.5

±1.0

2.5

%FS

44

ppm/

°C

POWER SUPPLY

Total Supply Current

275

mA

I(AVDD)

Analog Supply Current

221

mA

I(LVDD)

Digital Output Driver Supply Current

54

mA

Power Dissipation

904

950

mW

Power Down

Clock Running

90

mW

REFERENCE VOLTAGES

Reference Top (internal)

1.95

2.0

2.05

V

Reference Bottom (internal)

0.95

1.0

1.05

V

Common-Mode Voltage

1.45

1.5

1.55

V

±50mV Change in Voltage

±2

mA

Reference Top (external)

1.875

V

Reference Bottom (external)

1.125

V

2.0

mA

ANALOG INPUT

Differential Input Capacitance

7.0

pF

Analog Input Common-Mode Range

V

Differential Input Voltage Range

1.5

2.02

Voltage Overload Recovery Time

Recovery to Within 1% of Code

4.0

CLK Cycles

Input Bandwidth

−3dBFS

300

MHz

DIGITAL DATA OUTPUTS

Data Bit Rate

240

480

MBPS

SERIAL INTERFACE

SCLK

Serial Clock Input Frequency

20

MHz

Input Low Voltage

0

0.6

V

Input High Voltage

2.1

VDD

V

Input Current

±10

µA

Input Pin Capacitance

5.0

pF

(1)

Offset error is the deviation of the average code from mid-code for a zero input. Offset error is expressed in terms of % of full scale.

(2)

Fixed attenuation in the channel arises due to a fixed attenuation of about 1% in the sample-and-hold amplifier. When the differential voltage at the analog input pins are

(3)

Variable attenuation in the channel refers to the attenuation of the signal in the channel over and above the fixed attenuation.

(4)

(5)

The gain temperature coefficient refers to the temperature coefficient of the attenuation in the channel. It does not account for the variation of the reference voltages with

temperature.

(6)

(7)

Average current drawn from the reference pins in the external reference mode.