ADC-304-3 Просмотр технического описания (PDF) - DATEL Data Acquisition products

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ADC-304-3

8-Bit, 20MHz, Low-Power Flash A/D Converters

DATEL Data Acquisition products  

ADC-304

®

®

Table 1. Output Coding for +5V Power Supply Operation (+3 to +5V Signal Input)

Unipolar

Scale

+FS – 1SLB

+7/8FS

+3/4FS

+1/2FS

+1/4FS

+1/8FS

+1LSB

Zero

MINV

LINV

+4.9922V

+4.7500V

+4.5000V

+4.0000V

+3.5000V

+3.2500V

+3.0078V

+3.0000V

Straight

Binary

0

0

11111111

11011111

10111111

01111111

00111111

00011111

00000001

00000000

Complementary

Two’s

Two’s Complement Complement

0

1

10000000

10100000

11000000

00000000

01000000

01100000

01111110

01111111

1

0

01111111

01011111

00111111

11111111

10111111

10011111

10000001

10000000

Complementary

Binary

1

1

00000000

00100000

01000000

10000000

11000000

11100000

11111110

11111111

Table 2. Output Coding for ±5V Power Supply Operation (0 to –2V Signal Input)

Unipolar

Scale

Zero

–1LSB

–1/8FS

–1/4FS

–1/2FS

–3/4FS

–7/8FS

–FS + 1SLB

MINV

LINV

0.0000V

–0.0078V

–0.2500V

–0.5000V

–1.0000V

–1.5000V

–1.7500V

–1.9922V

Straight

Binary

0

0

11111111

11111110

11011111

10111111

01111111

00111111

00011111

00000000

Complementary

Two’s

Two’s Complement Complement

0

1

10000000

10000001

10100000

11000000

00000000

01000000

01100000

01111111

1

0

01111111

01111110

01011111

00111111

11111111

10111111

10011111

10000000

Complementary

Binary

1

1

00000000

00000001

00100000

01000000

10000000

11000000

11100000

11111111

APPLICATION CIRCUITS

+5V

+5V

+5V

(MSB)

BIT 1

BIT 2

BIT 3

BIT 4

LINV

BIT 5

BIT 6

BIT 7

BIT 8

(LSB)

1 BIT 1(MSB)

MINV 28

2 BIT 2

VM 27

3 BIT 3

VB 26

4 BIT 4

ANA GND 25

5 DIG GND

N.C. 24

6 +5V

ANA IN 23

7 –5.2V

N.C. 22

8 –5.2V

9 –5.2V

ANA IN 21

N.C. 20

10 +5V

ANA GND 19

11 DIG GND

VT 18

12 LINV

CLOCK 17

13 BIT 5

(LSB) BIT 8 16

14 BIT 6

BIT 7 15

MINV

+3V

VIN

ANALOG INPUT

+3 to +5V

CLOCK

(TTL LEVEL)

NOTE: 28-pin DIP package shown

Figure 4. Connections for +5V Power Supply Operation

(MSB)

BIT 1

BIT 2

BIT 3

BIT 4

LINV

BIT 5

BIT 6

BIT 7

(LSB)

BIT 8

1 BIT 1(MSB)

MINV 28

2 BIT 2

VM 27

3 BIT 3

VB 26

4 BIT 4

ANA GND 25

5 DIG GND

N.C. 24

6 +5V

ANA IN 23

7 –5.2V

N.C. 22

8 –5.2V

9 –5.2V

ANA IN 21

N.C. 20

10 +5V

ANA GND 19

11 DIG GND

VT 18

12 LINV

CLOCK 17

13 BIT 5

(LSB) BIT 8 16

14 BIT 6

BIT 7 15

MINV

–2V

VIN

ANALOG INPUT

0 to –2V

CLOCK

(TTL LEVEL)

–5.2V

NOTE: 28-pin DIP package shown

Figure 5. Connections for ±5V Power Supply Operation

4

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