THS5641A

8BIT, 100 MSPS, CommsDAC

DIGITALTOANALOG CONVERTER

SLAS277A −MARCH 2000 − REVISED SEPTEMBER 2002

2

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

description (continued)

The THS5641A provides a nominal full-scale differential output current of 20 mA and >300 k

Ω output

impedance, supporting both single-ended and differential applications. The output current can be directly fed

to the load (e.g., external resistor load or transformer), with no additional external output buffer required. An

accurate on-chip reference and control amplifier allows the user to adjust this output current from 20 mA down

to 2 mA, with no significant degradation of performance. This reduces power consumption and provides 20 dB

gain range control capabilities. Alternatively, an external reference voltage and control amplifier may be applied

in applications using a multiplying DAC.

The THS5641A is available in both a 28-pin SOIC and TSSOP package. The device is characterized for

operation over the industrial temperature range of −40

°C to 85°C.

AVAILABLE OPTIONS

PACKAGE

TA

28-TSSOP

(PW)

28-SOIC

(DW)

−40

°C to 85°C

THS5641AIPW

THS5641AIDW

functional block diagram

IOUT1

IOUT2

CLK

D[7:0]

EXTLO

DGND

AVDD

EXTIO

COMP2

Current

Source

Array

Output

Current

Switches

AGND

1.2 V

REF

BIASJ

−

+

Control

AMP

0.1

µF

2 k

Ω

I BIAS

COMP1

Logic

Control

50

Ω

1 nF

DVDD

RBIAS

SLEEP

MODE

RLOAD

RLOAD

CEXT

C1

0.1

µF

0.1

µF

50

Ω