Appendix C
588
THS5641A
8-BIT, 100 MSPS, CommsDAC
DIGITAL-TO-ANALOG 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 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 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
T
A
28-TSSOP
(PW)
28-SOIC
(DW)
–40°C to 85°C THS5641AIPW THS5641AIDW
functional block diagram
IOUT1
IOUT2
CLK
D[7:0]
EXTLO
DGND
AV
DD
EXTIO
COMP2
Current
Source
Array
Output
Current
Switches
AGND
1.2 V
REF
BIASJ
–
+
Control
AMP
0.1 µF
2 kΩ
I
BIAS
COMP1
Logic
Control
50 Ω
1 nF
DV
DD
R
BIAS
SLEEP
MODE
R
LOAD
R
LOAD
C
EXT
C
1
0.1 µF 0.1 µF
50 Ω
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