ADC-228

®

®

FUNCTIONAL SPECIFICATIONS

(Apply over the operating temperature range with 20MHz clock and ±15V and +5V

power supply voltages, unless otherwise specified.)

ANALOG INPUTS

MIN.

TYP.

MAX.

UNITS

Single-Ended, Non-Isolated

Input Range, dc-20MHz

0

—

+5.0

Volts

Input Resistance

2.45

2.5

2.55

k

Ω

Input Capacitance

—

5

10

pF

DIGITAL INPUTS

Logic Levels

Logic 1

+2.0

—

—

Volts

Logic 0

—

—

+0.8

Volts

Logic Loading

Logic 1

—

—

+160

µA

Logic 0

—

—

–0.5

mA

Clock Pulse Widths

"High"

25

—

—

ns

"Low"

19

—

—

ns

DIGITAL OUTPUTS

Coding

Resolution

Logic Levels

Logic 1

+2.4

—

—

Volts

Logic 0

—

—

+0.4

Volts

Logic Loading

Logic 1

—

—

–1

mA

Logic 0

—

—

+1

mA

Output Data Valid Delay

From Rising Edge

—

30

40

ns

Output Hold Time

5

—

—

ns

PERFORMANCE

Sampling Rate Œ

20

—

—

MHz

Differential Linearity 

Code Transitions

—

±0.5

±0.75

LSB

Code Centers

—

±0.25

±0.5

LSB

Integral Linearity, +25°C

End-point

—

±0.5

±0.75

LSB

Best-fit Line

—

±0.35

±0.5

LSB

Over Temperature End-point

—

—

±1

LSB

Best-fit Line

—

—

±1

LSB

Zero-Scale Offset

Code "0" to "1" Transition

+25°C

—

—

±0.5

LSB

–55 to +125°C

—

±0.5

±1.5

LSB

Gain error

—

±0.5

±1.5

LSB

Full Scale Absolute Accuracy

—

±0.5

±1.5

LSB

Differential Gain Ž

—

2

—

%

Differential Phase Ž

—

1

—

deg.

Aperture Delay

—

8

—

ns

Aperture Jitter

—

50

—

ps

No Missing Codes

Power Supply Rejection

DYNAMIC PERFORMANCE

MIN.

TYP.

MAX.

UNITS

Total Harm. Distortion, –0.5dB

DC to 2.5 MHz

—

–55

–53

dB

2.5 MHz to 5 MHz

—

–50

–48

dB

5 MHz to 10 MHz

—

–39

–36

dB

Signal-to-Noise Ratio

and Distortion, –0.5dB

DC to 2.5 MHz

44

49

—

dB

2.5 MHz to 5 MHz

43

46

—

dB

5 MHz to 10 MHz

35

38

—

dB

Signal-to-Noise Ratio

w/o Distortion, –0.5 dB

DC to 2.5 MHz

45

48

—

dB

2.5 MHz to 5 MHz

45

48

—

dB

5 MHz to 10 MHz

42

45

—

dB

Effective Bits, –0.5dB

DC to 2.5 MHz

7.1

7.75

—

Bits

2.5 MHz to 5 MHz

6.9

7.4

—

Bits

5 MHz to 10 MHz

5.6

6.1

—

Bits

Input Bandwidth

Full Power

7

—

—

MHz

Small Signal (–20dB)

40

—

—

MHz

POWER SUPPLY

Power Supply Range

+15V Supply

+11

+15

+15.75

Volts

–15V Supply

–11

–15

–15.75

Volts

+5V Supply

+4.75

+5

+5.25

Volts

Power Supply Current

+15V Supply

—

—

+30

mA

–15V Supply

—

—

–10

mA

+5V Supply

—

—

+230

mA

Power Dissipation

±12V, +5V Nominal

—

1.4

1.65

Watts

Over full supply range

—

1.6

1.85

Watts

±15V, +5V Nominal

—

1.5

1.75

Watts

PHYSICAL/ENVIRONMENTAL

Operating Temp. Range, Case

ADC-228MC

0 to +70°C

ADC-228MM, ADC-228/883

–55 to +125°C

Storage Temp. Range

–65 to +150°C

Package Type

24-pin, ceramic DDIP

Weight

0.3 ounces (8.5 grams)

Footnotes:

ΠAt full power input and chip selects enabled.

 See Technical Note 3.

Ž For 10-step, 40 IRE NTSC ramp test.

ABSOLUTE MAXIMUM RATINGS

PARAMETER

LIMITS

Power Supply Voltage,

Pin 1

–0.5 to +7V

Pin 19

–0.3 to +18V

Pin 10

+0.3 to –18V

Digital Inputs, Pins 8,9,11,12,18

–0.5 to +5.5V

Analog Input, Pin 5

–6 to +7.5V

Digital Outputs

–0.5 to +5.5V (short circuit protected to ground)

Lead Temp. (10 seconds)

+300°C

Over the operating temperature range

Straight bin., comp. bin., two's

comp.,

comp. two's comp.

8 bits

2