THS5661A

12BIT, 125 MSPS, CommsDAC

DIGITALTOANALOG CONVERTER

SLAS247B − NOVEMBER 1999 REVISED SEPTEMBER 2002

3

POST OFFICE BOX 655303

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

AGND

20

I

Analog ground return for the internal analog circuitry

AVDD

24

I

Positive analog supply voltage (3 V to 5.5 V)

BIASJ

18

O

Full-scale output current bias

CLK

28

I

External clock input. Input data latched on rising edge of the clock.

COMP1

19

I

Compensation and decoupling node, requires a 0.1

µF capacitor to AVDD.

COMP2

23

I

Internal bias node, requires a 0.1

µF decoupling capacitor to AGND.

D[11:0]

[1:12]

I

Data bits 0 through 11.

D11 is most significant data bit (MSB), D0 is least significant data bit (LSB).

DGND

26

I

Digital ground return for the internal digital logic circuitry

DVDD

27

I

Positive digital supply voltage (3 V to 5.5 V)

EXTIO

17

I/O

Used as external reference input when internal reference is disabled (i.e., EXTLO = AVDD). Used as internal

reference output when EXTLO = AGND, requires a 0.1

µF decoupling capacitor to AGND when used as reference

output.

EXTLO

16

O

Internal reference ground. Connect to AVDD to disable the internal reference source.

IOUT1

22

O

DAC current output. Full scale when all input bits are set 1

IOUT2

21

O

Complementary DAC current output. Full scale when all input bits are 0

MODE

25

I

Mode select. Internal pulldown. Mode 0 is selected if this pin is left floating or connected to DGND. See

timing diagram.

NC

[13:14]

N

No connection

SLEEP

15

I

Asynchronous hardware power down input. Active high. Internal pulldown. Requires 5

µs to power down but 3 ms

to power up.

−0.3 V to 6.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−0.3 V to 6.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage between AGND and DGND

−0.3 V to 0.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−6.5 V to 6.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CLK, SLEEP, MODE (see Note 2)

. . . . . . . . . . . . . . . . . . . . . .

Digital input D11−D0 (see Note 2)

. . . . . . . . . . . . . . . . . . . . .

IOUT1, IOUT2 (see Note 1)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMP1, COMP2 (see Note 1)

. . . . . . . . . . . . . . . . . . . . . . . . .

EXTIO, BIASJ (see Note 1)

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

EXTLO (see Note 1)

−0.3 V to 0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Peak input current (any input)

20 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Peak total input current (all inputs)

−30 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−40

°C to 85°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

−65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from the case for 10 seconds

260

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:

1. Measured with respect to AGND.

2. Measured with respect to DGND.