ADC081000 datasheet(7/29 Pages) NSC

Part #	ADC081000

Description	High Performance, Low Power 8-Bit, 1 GSPS A/D Converter

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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7 / 29 page

Converter Electrical Characteristics (Continued)

The following specifications apply after calibration for V

A =VDR = +1.9VDC, OutV = 1.9V, VIN FSR (a.c. coupled) = differential

800mV

P-P,CL = 10 pF, Differential, a.c. coupled Sinewave Clock, fCLK = 1 GHz at 0.5VP-P with 50% duty cycle, REXT = 3300

Ω

± 0.1%, Analog Signal Source Impedance = 100

Ω. Boldface limits apply for T

A =TMIN to TMAX. All other limits TA = 25˚C,

unless otherwise stated. (Notes 6, 7)

Symbol

Parameter

Conditions

Typical

(Note 8)

Limits

(Note 8)

Units

(Limits)

STATIC CONVERTER CHARACTERISTICS

THD

Total Harmonic Distortion

f

IN = 100 MHz, VIN = FSR − 0.5 dB

-57

dB

f

IN = 248 MHz, VIN = FSR − 0.5 dB

-57

−50

dB (max)

f

IN = 498 MHz, VIN = FSR − 0.5 dB

-57

−50

dB (max)

2nd Harm

Second Harmonic Distortion

f

IN = 100 MHz, VIN = FSR − 0.5 dB

−64

dB

f

IN = 248 MHz, VIN = FSR − 0.5 dB

−64

dB

f

IN = 498 MHz, VIN = FSR − 0.5 dB

−64

dB

3rd Harm

Third Harmonic Distortion

f

IN = 100 MHz, VIN = FSR − 0.5 dB

−64

dB

f

IN = 248 MHz, VIN = FSR − 0.5 dB

−64

dB

f

IN = 498 MHz, VIN = FSR − 0.5 dB

−64

dB

SFDR

Spurious-Free dynamic Range

f

IN = 100 MHz, VIN = FSR − 0.5 dB

58.5

dB

f

IN = 248 MHz, VIN = FSR − 0.5 dB

58.5

50

dB (min)

f

IN = 498 MHz, VIN = FSR − 0.5 dB

58.5

50

dB (min)

IMD

Intermodulation Distortion

f

IN1 = 121 MHz, VIN =FSR−7dB

f

IN2 = 126 MHz, VIN =FSR−7dB

-51

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 Low

600

550

mV

P-P (min)

650

mV

P-P (max)

FSR pin High

800

750

mV

P-P (min)

850

mV

P-P (max)

V

CMI

Common Mode Analog Input

Voltage

V

CMO

V

CMO −50

V

CMO+50

mV (min)

mV (max)

C

IN

Analog Input Capacitance

(Note 10)

Differential

0.02

pF

Each input to ground

1.6

pF

R

IN

Differential Input Resistance

100

94

Ω (min)

106

Ω (max)

ANALOG OUTPUT CHARACTERISTICS

V

CMO

Common Mode Output Voltage

I

CMO = ±1 µA

1.21

0.95

1.45

V (min)

V (max)

TC V

CMO

Common Mode Output Voltage

Temperature Coefficient

T

A = −40˚C to +85˚C

118

ppm/˚C

V

BG

Bandgap Reference Output

Voltage

I

BG = ±100 µA

1.26

1.22

1.33

V (min)

V (max)

TC V

BG

Bandgap Reference Voltage

Temperature Coefficient

T

A = −40˚C to +85˚C,

I

BG = ±100 µA

-28

ppm/˚C

CLOCK INPUT CHARACTERISTICS

V

ID

Differential Clock Input Level

Square Wave Clock

0.6

0.4

2.0

V

P-P (min)

V

P-P (max)

Sine Wave Clock

0.6

0.4

2.0

V

P-P (min)

V

P-P (max)

I

Input Current

V

IN =0VorVIN =VA

±1µA

C

IN

Input Capacitance (Note 10)

Differential

0.02

pF

Each Input to Ground

1.5

pF

www.national.com

7

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