LTC1283CS datasheet(4/24 Pages) LINER

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LTC1283

ELECTRICAL C

HARA TER STICS

DIGITAL A D

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IOZ

Hi-Z Output Leakage

VOUT = VCC, CS High

µA

VOUT = 0V, CS High

–3

µA

ISOURCE

Output Source Current

VOUT = 0V

– 4.5

ISINK

Output Sink Current

VOUT = VCC

4.5

ICC

Positive Supply Current

CS High, REF + Open

150

350

µA

IREF

Reference Current

VREF = 2.5V

250

500

µA

I –

Negative Supply Current

CS High, V – = – 3V

–1

– 50

µA

LTC1283/LTC1283A

(Note 3)

The q denotes specifications which apply over the operating temperature

range; all other limits and typicals TA = 25

°C.

Note 1: Absolute maximum ratings are those values beyond which the life

of a device may be impaired.

Note 2: All voltage values are with respect to ground with DGND, AGND

and REF – wired together (unless otherwise noted).

Note 3: VCC = 3V, VREF+ = 2.5V, VREF– = 0V, V – = 0V for unipolar mode

and – 3V for bipolar mode, ACLK = 1MHz, SCLK = 0.25MHz unless

otherwise specified.

Note 4: These specifications apply for both unipolar and bipolar modes. In

bipolar mode, one LSB is equal to the bipolar input span (2VREF) divided

by 1024. For example, when VREF = 2.5V, 1LSB (bipolar) = 2(2.5V)/1024 =

4.88mV.

Note 5: Linearity error is the deviation from ideal of the slope between the

two end points of the transfer curve.

Note 6: Two on-chip diodes are tied to each reference and analog input

which will conduct for reference or analog input voltages one diode drop

below V – or one diode drop above VCC. Be careful during testing at low

VCC levels, as high level reference or analog inputs can cause this input

diode to conduct, especially at elevated temperatures, and cause errors for

inputs near full scale. This spec allows 50mV forward bias of either diode.

This means that as long as the reference or analog input does not exceed

the supply voltage by more than 50mV, the output code will be correct.

Note 7: Channel leakage current is measured after the channel selection.

Note 8: To minimize errors caused by noise at the chip select input, the

internal circuitry waits for two ACLK falling edges after a chip select falling

edge is detected before responding to control input signals. Therefore, no

attempt should be made to clock an address in or data out until the

minimum chip select setup time has elapsed.

HARA TERISTICS

TYPICALPERFOR

Supply Current vs Temperature

Reference Current vs Temperature

AMBIENT TEMPERATURE (°C)

–50

100

250

LTC1283 • G01

200

150

–25

100

125

REF+ OPEN

ACLK = 500kHz

VCC = CS = 3V

REFERENCE VOLTAGE (V)

2.0

LTC1283 • G03

0.5

1.0

1.5

2.5

VCC = 3V

ACLK = 500kHz

Unadjusted Offset Error

vs Reference Voltage

TEMPERATURE (°C)

–50

200

500

LTC1283 • G02

100

400

300

–25

100

125

VCC = 3V

VREF = 2.5V

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