LTC2440IGN datasheet(4/28 Pages) LINER

4 / 28 page

LTC2440

sn2440, 2440fas

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC

Supply Voltage

●

4.5

5.5

ICC

Supply Current

Conversion Mode

CS = 0V (Note 7)

●

811

Sleep Mode

CS = VCC (Note 7)

●

830

µA

The

● denotes specifications which apply over the full operating temperature range,

otherwise specifications are at TA = 25°C. (Note 3)

POWER REQUIRE E TS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fEOSC

External Oscillator Frequency Range

●

0.1

MHz

tHEO

External Oscillator High Period

●

10000

tLEO

External Oscillator Low Period

●

10000

tCONV

Conversion Time

OSR = 256 (SDI = 0)

●

0.99

1.13

1.33

OSR = 32768 (SDI = 1)

●

126

145

170

External Oscillator (Note 10, 13)

●

40 • OSR + 170

fEOSC(kHz)

fISCK

Internal SCK Frequency

Internal Oscillator (Note 9)

●

0.8

0.9

MHz

External Oscillator (Notes 9, 10)

fEOSC/10

DISCK

Internal SCK Duty Cycle

(Note 9)

●

fESCK

External SCK Frequency Range

(Note 8)

●

MHz

tLESCK

External SCK Low Period

(Note 8)

●

tHESCK

External SCK High Period

(Note 8)

●

tDOUT_ISCK

Internal SCK 32-Bit Data Output Time

Internal Oscillator (Notes 9, 11)

●

41.6

35.3

30.9

µs

External Oscillator (Notes 9, 10)

●

320/fEOSC

tDOUT_ESCK

External SCK 32-Bit Data Output Time

(Note 8)

●

32/fESCK

↓ to SDO Low Z

(Note 12)

●

025

↑ to SDO High Z

(Note 12)

●

025

↓ to SCK ↓

(Note 9)

µs

↓ to SCK ↑

(Notes 8, 12)

●

tKQMAX

SCK

↓ to SDO Valid

●

tKQMIN

SDO Hold After SCK

↓

(Note 5)

●

SCK Set-Up Before CS

↓

●

SDI Setup Before SCK

↑

●

Note 5

SDI Hold After SCK

↑

●

Note 5

The

● denotes specifications which apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. (Note 3)

TI I G CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: All voltage values are with respect to GND.

Note 3: VCC = 4.5 to 5.5V unless otherwise specified.

VREF = REF

+ – REF–, VREFCM = (REF+ + REF–)/2;

VIN = IN+ – IN–, VINCM = (IN+ + IN–)/2.

Note 4: FO pin tied to GND or to external conversion clock source with

fEOSC = 10MHz unless otherwise specified.

Note 5: Guaranteed by design, not subject to test.

Note 6: Integral nonlinearity is defined as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve.

The deviation is measured from the center of the quantization band.

Note 7: The converter uses the internal oscillator.

Note 8: The converter is in external SCK mode of operation such that the

SCK pin is used as a digital input. The frequency of the clock signal driving

SCK during the data output is fESCK and is expressed in Hz.

Note 9: The converter is in internal SCK mode of operation such that the

SCK pin is used as a digital output. In this mode of operation, the SCK pin

has a total equivalent load capacitance of CLOAD = 20pF.

Note 10: The external oscillator is connected to the FO pin. The external

oscillator frequency, fEOSC, is expressed in kHz.

Note 11: The converter uses the internal oscillator. FO = 0V.

Note 12: Guaranteed by design and test correlation.

Note 13: There is an internal reset that adds an additional 1

µs (typical) to

the conversion time.

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