LTC1851CFW datasheet(4/28 Pages) LINER

Part #	LTC1851CFW

Description	8-Channel, 10-Bit/12-Bit, 1.25Msps Sampling ADCs

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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4

LTC1850/LTC1851

18501f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIH

High Level Input Voltage

VDD = 5.25V

q

2.4

V

VIL

Low Level Input Voltage

VDD = 4.75V

q

0.8

V

IIN

Digital Input Current

VIN = 0V to VDD

q

±5

µA

CIN

Digital Input Capacitance

2pF

VOH

High Level Output Voltage

VDD = 4.75V, IO = –10µA

4.5

V

VDD = 4.75V, IO = – 200µA

q

4.0

V

VOL

Low Level Output Voltage

VDD = 4.75V, IO = 160µA

0.05

V

VDD = 4.75V, IO = 1.6mA

q

0.10

0.4

V

IOZ

Hi-Z Output Leakage D11 to D0, ADOUT, A1OUT, A2OUT, DIFFOUT VOUT = 0V to VDD, CS High

q

±10

µA

COZ

Hi-Z Capacitance D11 to D0, ADOUT, A1OUT, A2OUT, DIFFOUT

CS High (Note 9)

q

15

pF

ISOURCE

Output Source Current

VOUT = 0V

– 20

mA

ISINK

Output Sink Current

VOUT = VDD

30

mA

The q denotes the specifications which apply over the

full operating temperature range, otherwise specifications are at TA = 25°C. (Note 5)

DIGITAL I PUTS A D DIGITAL OUTPUTS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

REFOUT Output Voltage

IOUT = 0

2.48

2.50

2.52

V

REFOUT Output Temperature Coefficient

IOUT = 0

±15

ppm/

°C

REFOUT Line Regulation

0.01

LSB/V

Reference Buffer Gain

VREFCOMP/VREFIN

1.636

1.638

1.640

V/V

REFCOMP Output Voltage

External 2.5V Reference

4.090

4.096

4.100

V

Internal 2.5V Reference

4.060

4.096

4.132

V

REFCOMP Impedance

REFIN = VDD

6.4

k

Ω

TA = 25°C. (Notes 5, 6)

I TER AL REFERE CE

LTC1850

LTC1851

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

SNR

Signal-to-Noise Ratio

47kHz Input Signal

Unipolar, PGA = 0

61.6

71

dB

Unipolar, PGA = 1

61.7

72

dB

Bipolar, PGA = 0

61.6

71

dB

Bipolar, PGA = 1

61.7

72

dB

S/(N+D)

Signal-to-(Noise + Distortion) Ratio

47kHz Input Signal

Unipolar, PGA = 0

61.0

70

dB

Unipolar, PGA = 1

61.0

71

dB

Bipolar, PGA = 0

61.0

71

dB

Bipolar, PGA = 1

61.2

72

dB

THD

Total Harmonic Distortion

47kHz Input Signal,

Unipolar, PGA = 0

First 5 Harmonics

–76

–80

dB

Unipolar, PGA = 1

–78

–82

dB

Bipolar, PGA = 0

–81

–87

dB

Bipolar, PGA = 1

–80

–86

dB

SFDR

Spurious-Free Dynamic Range

47kHz Input Signal

Unipolar, PGA = 0

74

82

dB

Unipolar, PGA = 1

80

86

dB

Bipolar, PGA = 0

84

90

dB

Bipolar, PGA = 1

82

88

dB

DY A IC ACCURACY (Note 5)

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