REV. F

a

AD9012

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High Speed 8-Bit

TTL A/D Converter

FUNCTIONAL BLOCK DIAGRAM

256

255

128

127

2

1

D

E

C

O

D

I

N

G

L

O

G

I

C

L

A

T

C

H

R

R

R

R/2

R/2

R

R

OVERFLOW

INH

ANALOG IN

ENCODE

GND

HYSTERESIS

OVERFLOW

AD9012

FEATURES

100 MSPS ENCODE Rate

Very Low Input Capacitance—16 pF

Low Power—1 W

TTL Compatible Outputs

MIL-STD-883 Compliant Versions Available

APPLICATIONS

Radar Guidance

Digital Oscilloscopes/ATE Equipment

Laser/Radar Warning Receivers

Digital Radio

Electronic Warfare (ECM, ECCM, ESM)

Communication/Signal Intelligence

GENERAL DESCRIPTION

The AD9012 is an 8-bit, ultrahigh speed, analog-to-digital

converter. The AD9012 is fabricated in an advanced bipolar

process that allows operation at sampling rates up to 100

megasamples/second. Functionally, the AD9012 is comprised

of 256 parallel comparator stages whose outputs are decoded

to drive the TTL compatible output latches.

The exceptionally wide large-signal analog input bandwidth of

160 MHz is due to an innovative comparator design and very

close attention to device layout considerations. The wide input

bandwidth of the AD9012 allows very accurate acquisition of

high speed pulse inputs without an external track-and-hold.

The comparator output decoding scheme minimizes false codes,

which is critical to high speed linearity.

The AD9012 is available in two grades: one with 0.5 LSB

linearity and one with 0.75 LSB linearity. Both versions are

offered in an industrial grade, –25

°C to +85°C, packaged in a

28-lead DIP and a 28-lead JLCC. The military temperature

range devices, –55

°C to +125°C, are available in ceramic DIP

and LCC packages and are compliant to MIL-STD-883 Class B.

The AD9012 is available in versions compliant with MIL-STD-883.

Refer to the Analog Devices Military Products Databook or

current AD9012/883B data sheet for detailed specifications.