SPT7936 datasheet(2/8 Pages) FAIRCHILD

Part #	SPT7936

Description	12-BIT, 28 MSPS SAMPLING A/D CONVERTER

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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SPT7936

ABSOLUTE MAXIMUM RATINGS (Beyond which damage may occur)1 25

°C

Supply Voltages

VDD1 ................................................................... - 0.3 V to +6 V

VDD2 ................................................................... - 0.3 V to +6 V

Input Voltages

Analog In ....................................... - 0.3 V to VDD + 0.3 V

Digital In ........................................ - 0.3 V to VDD + 0.3 V

REFP .................................................... - 0.3 V to VDD + 0.3 V

REFN .................................................... - 0.3 V to VDD + 0.3 V

CLOCK .......................................... - 0.3 V to VDD + 0.3 V

Temperatures

Operating Temperature ................................. 0 to +70

°C

Storage Temperature.. ............................. - 65 to +125

°C

Note:

1.

Operation at any Absolute Maximum Rating is not implied. See Electrical Specifications for proper nominal

applied conditions in typical applications.

ELECTRICAL SPECIFICATIONS

TA = TMIN-TMAX, VDD1 =VDD2 = 3.3 V, Sampling Rate = 28 MSPS, Differential input signal, 50% duty cycle clock with 2.5 ns rise and fall times, unless otherwise

specified.

TEST

SPT7936

PARAMETERS

CONDITIONS

LEVEL

MIN

TYP

MAX

UNITS

DC Accuracy

Differential Nonlinearity (DNL)

VI

±0.5

±1.0

LSB

Integral Nonlinearity

VI

±1.3

±3.0

LSB

Common Mode Rejection Ratio (CMRR)

V

54

dB

No Missing Codes

Guaranteed

Analog Input

Input Voltage Range (differential) VFSR

IV

0.6

±1

±1.2

V

Common Mode Input Voltage VCMI

IV

1.2

1.5

1.6

V

Input Capacitance CIN

V2

pF

(From Each Input to Ground)

Midscale Offset VOS

VIN+=VIN–=VCM

V

±2%

Gain Error

V

-0.2

%

Input Bandwidth

Large Signal

V

150

MHz

Reference Voltages

Internal Reference Voltage on Pin 10 (VREFNI)

VI

0.95

1.0

1.05

V

Internal Reference Voltage on Pin 11 (VREFPI)

VI

1.95

2.0

2.05

V

Internal Reference Voltage Drift

IV

100

ppm/

°C

Negative Input Voltage (VREF-)

VI

0.9

1.0

1.3

V

Positive Input Voltage (VREF+)

VI

1.9

2.0

2.3

V

Reference Input Voltage Range (VREF+ — VREF-)

IV

0.6

1.0

1.2

V

Common Mode Output Voltage (VCM)

VI

1.45

1.50

1.55

V

Bandgap Output Voltage (VBGAP)

VI

2.365

2.415

2.465

V

Dynamic Performance

Effective Number of Bits

fIN = 5.0 MHz

V

10.0

Bits

fIN = 10.0 MHz

VI

9.2

9.7

Bits

Signal to Noise and Distortion Ratio (SINAD)

fIN = 5.0 MHz

V

62

dB

fIN = 10.0 MHz

VI

57

60

dB

Signal to Noise Ratio (SNR)

fIN = 5.0 MHz

V

64

dB

Without Harmonics

fIN = 10.0 MHz

VI

59

63

dB

Total Harmonic Distortion (THD)

fIN = 5.0 MHz

V

–66

dB

fIN = 10.0 MHz

VI

–64

–61

dB

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