THS5641

8-BIT, 100 MSPS, CommsDAC

™

DIGITAL-TO-ANALOG CONVERTER

SLAS199A – MAY 1999 REVISED JUNE 1999

2

POST OFFICE BOX 655303

description (continued)

The THS5641 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 THS5641 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

THS5641IPW

THS5641IDW

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