ADC082500 datasheet(9/33 Pages) NSC

Nome de Peças	ADC082500

Descrição Electrónicos	High Performance, Low Power, 8-Bit, 2.5 GSPS A/D Converter

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Fabricante Electrônico	NSC [National Semiconductor (TI)]

Página de início	http://www.national.com

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9 / 33 page

Converter Electrical Characteristics (Continued)

NOTE: This product is currently in development and the parameters specified in this section are DESIGN TARGETS.

The specifications in this section cannot be guaranteed until device characterization has taken place. The following

specifications apply after calibration for V

A =VDR = +1.9VDC, OutV = 1.9V, VIN FSR (a.c. coupled) = differential 870mVP-P,CL

= 10 pF, Differential, a.c. coupled Sinewave Input Clock, f

CLK = 1.25GHz at 0.5VP-P with 50% duty cycle, VBG = Floating, Non-

Extended Control Mode, SDR Mode, R

EXT = 3300

Ω ±0.1%, Analog Signal Source Impedance = 100Ω Differential. Boldface

limits apply for T

A =TMIN to TMAX. All other limits TA = 25˚C, unless otherwise noted. (Notes 6, 7)

Symbol

Parameter

Conditions

Typical

(Note 8)

Limits

(Note 8)

Units

(Limits)

DYNAMIC CONVERTER CHARACTERISTICS

SINAD

Signal-to-Noise Plus Distortion

Ratio

f

IN = 248 MHz, VIN = FSR − 0.5 dB

45.4

TBD

dB (min)

f

IN = 625 MHz, VIN = FSR − 0.5 dB

44

TBD

dB (min)

f

IN = 1250 MHz, VIN = FSR − 0.5 dB

TBD

dB (min)

SNR

Signal-to-Noise Ratio

f

IN = 248 MHz, VIN = FSR − 0.5 dB

45.6

TBD

dB (min)

f

IN = 625 MHz, VIN = FSR − 0.5 dB

44.0

TBD

dB (min)

f

IN = 1250 MHz, VIN = FSR − 0.5 dB

TBD

dB (min)

THD

Total Harmonic Distortion

f

IN = 248 MHz, VIN = FSR − 0.5 dB

-55

-TBD

dB (max)

f

IN = 625 MHz, VIN = FSR − 0.5 dB

-54

-TBD

dB (max)

f

IN = 1250 MHz, VIN = FSR − 0.5 dB

-TBD

dB (max)

2nd Harm

Second Harmonic Distortion

f

IN = 248 MHz, VIN = FSR − 0.5 dB

−TBD

dB

f

IN = 625 MHz, VIN = FSR − 0.5 dB

−TBD

dB

f

IN = 1250 MHz, VIN = FSR − 0.5 dB

−TBD

dB

3rd Harm

Third Harmonic Distortion

f

IN = 248 MHz, VIN = FSR − 0.5 dB

−TBD

dB

f

IN = 625 MHz, VIN = FSR − 0.5 dB

−TBD

dB

f

IN = 1250 MHz, VIN = FSR − 0.5 dB

−TBD

dB

SFDR

Spurious-Free dynamic Range

f

IN = 248 MHz, VIN = FSR − 0.5 dB

57.4

TBD

dB (min)

f

IN = 625 MHz, VIN = FSR − 0.5 dB

54

TBD

dB (min)

f

IN = 1250 MHz, VIN = FSR − 0.5 dB

TBD

dB (min)

IMD

Intermodulation Distortion

f

IN1 = 321 MHz, VIN =FSR−7dB

f

IN2 = 326 MHz, VIN =FSR−7dB

-TBD

dB

Out of Range Output Code

(In addition to OR Output high)

(V

IN+)−(VIN−) > + Full Scale

255

(V

IN+)−(VIN−) < − Full Scale

0

ANALOG INPUT AND REFERENCE CHARACTERISTICS

V

IN

Full Scale Analog Differential

Input Range

FSR pin 14 Low

600

520

mV

P-P (min)

680

mV

P-P (max)

FSR pin 14 High

800

720

mV

P-P (min)

880

mV

P-P (max)

V

CMI

Analog Input Common Mode

Voltage

V

CMO

V

CMO −50

V

CMO +50

mV (min)

mV (max)

C

IN

Analog Input Capacitance,

Normal operation (Notes 10,

11)

Differential

0.02

pF

Each input pin to ground

1.6

pF

Analog Input Capacitance, DES

Mode (Notes 10, 11)

Differential

0.08

pF

Each input pin to ground

2.2

pF

R

IN

Differential Input Resistance

100

94

Ω (min)

106

Ω (max)

ANALOG OUTPUT CHARACTERISTICS

V

CMO

Common Mode Output Voltage

1.26

0.95

1.45

V (min)

V (max)

V

CMO_LVL

V

CMO input threshold to set DC

Coupling mode

V

A = 1.8V

0.60

V

A = 2.0V

0.66

V

TC V

CMO

Common Mode Output Voltage

Temperature Coefficient

T

A = −40˚C to +85˚C

118

ppm/˚C

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