IN N O VA T IO N a n d E X C ELL E N C E

®

®

INPUT/OUTPUT

CONNECTIONS

DIP

LCC

PINS

FUNCTION

PINS

1

CLOCK INPUT

1

2

DIGITAL GROUND

4

3

–REFERENCE

5

4

ANALOG INPUT

6

5

MIDPOINT

7

6

+REFERENCE

8

7

ANALOG GROUND

9

8

CS1

11

9

CS2

12

10

OVERFLOW

13

11

BIT 1 (MSB)

14

12

BIT 2

16

13

BIT 3

17

14

BIT 4

19

15

BIT 5

20

16

BIT 6

21

17

BIT 7 (LSB)

23

18

+5V SUPPLY

24

Figure 1. ADC-207 Functional Block Diagram (DIP Pinout)

FEATURES

• 7-bit flash A/D converter

• 20MHz sampling rate

• Low power (250mW)

• Single +5V supply

• 1.2 micron CMOS technology

• 7-bit latched 3-state output with overflow bit

• Surface-mount versions

• High-reliability version

• No missing codes

GENERAL DESCRIPTION

The ADC-207 is the industry’s first 7-bit flash converter using an

advanced high-speed VLSI 1.2 micron CMOS process. This

process offers some very distinctive advantages over other

processes, making the ADC-207 unique. The smaller

geometrics of the process achieve high speed, better linearity

and superior temperature performance.

Since the ADC-207 is a CMOS device, it also has very low

power consumption (250mW). The device draws power from

a single +5V supply and is conservatively rated for 20MHz

operation. The ADC-207 allows using sampling apertures as

small as 12ns, making it more closely approach an ideal

sampler. The small sampling apertures also let the device

operate at greater than 20MHz.

The ADC-207 has 128 comparators which are auto-balanced

on every conversion to cancel out any offsets due to

temperature and/or dynamic effects. The resistor ladder has a

midpoint tap for use with an external voltage source to improve

integral linearity beyond 7 bits. The ADC-207 also provides the

user with 3-state outputs for easy interfacing to other

components.

There are six models of the ADC-207 covering two operating

temperature ranges, 0 to +70°C and –55 to +125°C. Two high-

reliability "QL" models are also available.

D

G Q

D

G Q

D

G Q

D

G Q

D

G Q

D

G Q

D

G

Q

D

G

Q

D

G

Q

D

G

Q

D

G

Q

D

G

Q

D

G

Q

D

G

Q

ANALOG INPUT 4

+REFERENCE 6

DIGITAL GROUND 2

ANALOG GROUND 7

RANGE MIDPOINT 5

R/2

R

R

R

R

R/2

R/2

–REFERENCE 3

CS1 8

9

+5V SUPPLY 18

+VDD

1 CLOCK INPUT

CLOCK

GENERATOR

10 OVERFLOW

11 BIT 1 (MSB)

12 BIT 2

13 BIT 3

14 BIT 4

15 BIT 5

16 BIT 6

17 BIT 7 (LSB)

128-TO-7

ENCODER

CS2

D

G Q

D

G Q

D

G Q

D

G Q

∅1

∅2

∅2

∅1

ADC-207

7-Bit, 20MHz, CMOS

Flash A/D Converters

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)

• Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance (800) 233-2765