LTC1288CS8 datasheet(4/24 Pages) LINER

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LTC1285/LTC1288

TYPICAL PERFORMANCE CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tSMPL

Analog Input Sample Time

See Operating Sequence

1.5

CLK Cycles

fSMPL(MAX) Maximum Sampling Frequency

LTC1285

7.5

kHz

LTC1288

6.6

kHz

tCONV

Conversion Time

See Operating Sequence

CLK Cycles

tdDO

Delay Time, CLK

↓ to DOUT Data Valid

See Test Circuits

600

1500

tdis

Delay Time, CS

↑ to DOUT Hi-Z

See Test Circuits

220

660

ten

Delay Time, CLK

↓ to DOUT Enable

See Test Circuits

180

500

thDO

Time Output Data Remains Valid After CLK

↓

CLOAD = 100pF

520

DOUT Fall Time

See Test Circuits

180

DOUT Rise Time

See Test Circuits

180

CIN

Input Capacitance

Analog Inputs, On Channel

Analog Inputs, Off Channel

Digital Input

(Note 5)

AC CHARACTERISTICS

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 3V. For 5V specified devices, see

LTC1286 and LTC1298.

Note 4: Increased leakage currents at elevated temperatures cause the

sample-and-hold to droop, therefore it is recommended that fCLK ≥ 75kHz

at 70

° and fCLK ≥ 1kHz at 25°C.

Note 5: VCC = 2.7V, VREF = 2.5V and CLK = 120kHz 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 2.7V

≤ VCC ≤ 6V. 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 2.7V

input voltage range will therefore require a minimum supply voltage of

2.650V over initial tolerance, temperature variations and loading. For 2.7V

< VCC

≤ 6V, reference and analog input range cannot exceed 6.05V. If

reference and analog input range are greater than 6.05V, the output code

will not be guaranteed to be correct.

Note 8: The supply voltage range for the LTC1285 and the LTC1288 is

from 2.7V to 6V.

Note 9: Recommended operating conditions

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

SAMPLE RATE (kHz)

0.1

1000

100

110

LTC1285/88 • TPC01

LTC1288

LTC1285

TA = 25°C

VCC = 2.7V

VREF = 2.5V

fCLK = 120kHz

Supply Current vs Sample Rate

FREQUENCY (kHz)

LTC1285/88 • TPC03

100

0.002

120

TA = 25°C

VCC = 2.7V

VREF = 2.5V

CS = 0

(AFTER CONVERSION)

CS = VCC

Shutdown Supply Current vs Clock

Rate with CS High and CS Low

TEMPERATURE (°C)

–55

150

200

250

105

LTC1285/88 • TPC02

100

–15

–35

125

VCC = 2.7V

VREF = 2.5V

fCLK = 120kHz

LTC1285

fSMPL = 7.5kHz

LTC1288

fSMPL = 6.6kHz

Supply Current vs Temperature

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