MAX1125 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1125

8-Bit, 300Msps Flash ADC

Maxim Integrated 

8-Bit, 300Msps Flash ADC

______________________________________________________________Pin Description

PIN

Ceramic SB

1, 4, 17, 25, 26, 38, 39

CERQUAD

3, 7, 12, 22, 27, 32

2, 19, 22, 24, 27, 28, 36,

37, 40, 42

28, 30

3

31

5, 16, 29, 31, 33, 35

2, 8, 9, 14, 16, 18, 20,

25, 26, 33

6, 15

7

8–13

14

18

—

20

21

—

23

1, 34

36

37–42

43

4

44

5

6

10

11

30, 34

15, 19

—

13

32

17

—

21

41

23

—

24

—

29

—

35

NAME

FUNCTION

VEE

N.C.

LINV

AGND

DGND

D0

D1–D6

D7

MINV

D8

CLK

CLK

VRBS

VRBF

VIN

VR1

VR2

VR3

VRTF

VRTS

DRINV

DREADY

Negative Analog Supply (nominally -5.2V)

No Connect. Not internally connected.

D0–D6 Output Inversion Control

Analog Ground

Digital Ground

Digital Data Output (LSB)

Digital Data Output

Digital Data Output (MSB)

D7 Output Inversion Control

Overrange Output

Inverse ECL Clock Input Pin

ECL Clock Input Pin

Reference Voltage Bottom, Sense

Reference Voltage Bottom, Force

Analog Input. Can be connected to the input

signal or used as a sense.

Reference Voltage Tap 1 (typically -1.5V)

Reference Voltage Tap 2 (typically -1V)

Reference Voltage Tap 3 (typically -0.5V)

Reference Voltage Top, Force

Reference Voltage Top, Sense

Data-Ready Inverse

Data-Ready Output

_______________Detailed Description

The MAX1125 is a 300Msps, monolithic, 8-bit parallel

flash analog-to-digital converter (ADC) with an analog

bandwidth of over 200MHz. A major advance over pre-

vious flash converters is the inclusion of 256 input pre-

amplifiers between the reference ladder and input

comparators. (See Functional Diagram.) This feature

not only reduces clock-transient kickback to the input

and reference ladder due to a low AC beta, but also

reduces the effect of the dynamic state of the input sig-

nal on the latching characteristics of the input compara-

tors. The preamplifiers act as buffers and stabilize the

input capacitance so it remains constant for varying

input voltages and frequencies, making the part easier

to drive than previous flash converters. The MAX1125

incorporates a special decoding scheme that reduces

metastable errors (sparkle codes or flyers) to a maxi-

mum of 1LSB.

_______________________________________________________________________________________ 5

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