THS5641 Datasheet, PDF (2/28 Pages) Texas Instruments – 8-BIT, 100 MSPS, CommsDACE DIGITAL-TO-ANALOG CONVERTER

THS5641
8-BIT, 100 MSPS, CommsDAC™
DIGITAL-TO-ANALOG CONVERTER
SLAS199A – MAY 1999 REVISED JUNE 1999
description (continued)
The THS5641 provides a nominal full-scale differential output current of 20 mA and >300 kΩ 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
28-SOIC
(PW)
(DW)
– 40°C to 85°C
THS5641IPW
THS5641IDW
functional block diagram
C1 ^AVDD
EXTLO
CEXT
0.1 µF
2 kΩ
EXTIO
BIASJ
I _BIAS
RBIAS
DVDD
D[7:0]
SLEEP COMP1
1.2 V
REF
1 nF
–
+
Control
AMP
0.1 µF
COMP2
0.1 µF
Current
Source
Array
Output
Current
Switches
Logic
Control
IOUT1
50 Ω ^RLOAD
IOUT2
50 Ω ^RLOAD
MODE
CLK
DGND
AGND
2
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