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LTC1283CN
(Rev.:RevB)

3V Single Chip 10-Bit Data Acquisition System

Linear Technology 

LTC1283

DIGITAL A D DC ELECTRICAL CHARACTERISTICS The ● denotes the specifications which

apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)

SYMBOL PARAMETER

IOZ

Hi-Z Output Leakage

ISOURCE

ISINK

ICC

IREF

I–

Output Source Current

Output Sink Current

Positive Supply Current

Reference Current

Negative Supply Current

CONDITIONS

VOUT = VCC, CS High

VOUT = 0V, CS High

VOUT = 0V

VOUT = VCC

CS High, REF + Open

VREF = 2.5V

CS High, V – = – 3V

LTC1283/LTC1283A

MIN TYP MAX

●

3

●

–3

– 4.5

4.5

●

150 350

●

250 500

●

–1

– 50

UNITS

μA

μA

mA

mA

μA

μA

μA

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

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.

TYPICAL PERFOR A CE CHARACTERISTICS

Supply Current vs Temperature

250

REF+ OPEN

ACLK = 500kHz

200 VCC = CS = 3V

150

100

50

0

–50 –25 0 25 50 75 100 125

AMBIENT TEMPERATURE (°C)

LTC1283 • G01

Reference Current vs Temperature

500

VCC = 3V

VREF = 2.5V

400

300

200

100

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

LTC1283 • G02

Unadjusted Offset Error

vs Reference Voltage

0.5

VCC = 3V

VREF = 2.5V

0.4 ACLK = 500kHz

0.3

0.2

0.1

0

–50 –25 0 25 50 75 100 125

AMBIENT TEMPERATURE (°C)

LTC1283 • G06

1283fb

4

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