LTC1286CS8 datasheet(4/24 Pages) LINER

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LTC1286/LTC1298

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tSMPL

Analog Input Sample Time

See Operating Sequence

1.5

CLK Cycles

fSMPL(MAX) Maximum Sampling Frequency

LTC1286

12.5

kHz

LTC1298

11.1

kHz

tCONV

Conversion Time

See Operating Sequence

CLK Cycles

tdDO

Delay Time, CLK

↓ to DOUT Data Valid

See Test Circuits

250

600

tdis

Delay Time, CS

↑ to DOUT Hi-Z

See Test Circuits

135

300

ten

Delay Time, CLK

↓ to DOUT Enable

See Test Circuits

200

thDO

Time Output Data Remains Valid After CLK

↓

CLOAD = 100pF

230

DOUT Fall Time

See Test Circuits

DOUT Rise Time

See Test Circuits

CIN

Input Capacitance

Analog Inputs, On Channel

Analog Inputs, Off Channel

Digital Input

AC CHARACTERISTICS (Note 5)

The q denotes specifications which apply over the full operating

temperature range.

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 GND.

Note 3: These devices are specified at 5V. For 3V specified devices, see

LTC1285 and LTC1288.

Note 4: Increased leakage currents at elevated temperatures cause the S/H

to droop, therefore it is recommended that fCLK ≥ 120kHz at 85°C, fCLK ≥

75kHz at 70

° and fCLK ≥ 1kHz at 25°C.

Note 5: VCC = 5V, VREF = 5V and CLK = 200kHz unless otherwise specified.

Note 6: Linearity error is specified between the actual end points of the

A/D transfer curve.

Note 7: 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 GND or one diode drop above VCC. This spec allows 50mV forward

bias of either diode for 4.5V

≤ VCC ≤ 5.5V. 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. To achieve an absolute 0V to 5V

input voltage range will therefore require a minimum supply voltage of

4.950V over initial tolerance, temperature variations and loading. For 5.5V

< VCC

≤ 9V, reference and analog input range cannot exceed 5.55V. If

reference and analog input range are greater than 5.55V, the output code

will not be guaranteed to be correct.

Note 8: The supply voltage range for the LTC1286 is from 4.5V to 9V, but

the supply voltage range for the LTC1298 is only from 4.5V to 5.5V.

Note 9: Recommended operating conditions

Note 10: Channel leakage current is measured after the channel selection.

TYPICAL PERFORMANCE CHARACTERISTICS

Shutdown Supply Current vs Clock

Rate with CS High and CS Low

Supply Current vs Sample Rate

SAMPLE RATE (kHz)

0.1k

100

1000

10k

100k

LT1286/98 G03

TA = 25°C

VCC = VREF = 5V

fCLK = 200kHz

LTC1286

LTC1298

Supply Current vs Temperature

TEMPERATURE (°C)

–55

200

250

350

400

450

–15

125

LT1286/98 G04

300

–35

85 105

TA = 25°C

VCC = VREF = 5V

fCLK = 200kHz

LTC1298 fSMPL =11.1kHz

LTC1286 fSMPL =12.5kHz

FREQUENCY (kHz)

0.002

100

140

LT1286/98 G01

180 200

40 60

120

160

CS = 0

(AFTER CONVERSION)

TA = 25°C

VCC = VREF = 5V

CS = VCC

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