WM2638

Production Data

WOLFSON MICROELECTRONICS LTD

PD Rev 1.0 July 99

2

PIN CONFIGURATION

1

2

3

4

NCS

DIN

SCLK

AGND

REF

OUTB

VDD

OUTA

5

6

7

8

PIN DESCRIPTION

PIN NO

NAME

TYPE

DESCRIPTION

1

DIN

Digital input

Serial data input.

2

SCLK

Digital input

Serial clock input.

3

NCS

Digital input

Chip select. This pin is active low.

4

OUTA

Analogue output

DAC A analogue output.

5

AGND

Supply

Analogue ground.

6

REF

Analogue I/O

Reference voltage input/output.

7

OUTB

Analogue output

DAC B analogue output

8

VDD

Supply

Positive power supply.

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or

beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical

Characteristics at the test conditions specified

ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to

damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this

device.

CONDITION

MIN

MAX

Supply voltage, VDD to AGND

7V

Digital input voltage range to AGND

-0.3V

VDD + 0.3V

Reference input voltage range to AGND

-0.3V

VDD + 0.3V

Output voltage at OUT from external source

VDD + 0.3V

WM2638C

WM2638I

0

°C

-40

°C

70

°C

85

°C

Storage temperature

-65

°C

150

°C

Lead temperature 1.6mm (1/16 inch) soldering for 10 seconds

260

°C

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Supply voltage

VDD

2.7

5.5

V

High-level digital input voltage

2

0.8

V

Low-level digital input voltage

V

Reference voltage to REF

VDD - 1.5

V

Load resistance

2

k

Ω

Load capacitance

100

Serial clock rate

20

WM2638C

0

70

°C

Operating free-air temperature

WM2638I

-40

85

°C

Note: Reference voltages greater than VDD/2 will cause saturation for large DAC codes.