Agilent Technologies 93000 SOC Series Training Manual page 588

THS5641A
8-BIT, 100 MSPS, CommsDAC
Appendix C
DIGITAL-TO-ANALOG CONVERTER
SLAS277A –MARCH 2000 – REVISED SEPTEMBER 2002
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.
functional block diagram
EXTLO
EXTIO
C EXT
BIASJ
0.1 µF
I BIAS
R BIAS
2 kΩ
DV DD
D[7:0]
MODE
CLK
2
AVAILABLE OPTIONS
T A
28-TSSOP
(PW)
– 40°C to 85°C THS5641AIPW
0.1 µF
SLEEP COMP1
1.2 V
REF
1 nF
–
+
Control
AMP
DGND
588
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265
PACKAGE
28-SOIC
(DW)
THS5641AIDW
AV DD
C 1
0.1 µF
COMP2
Output
Current
Current
Source
Array Switches
Logic
Control
IOUT1
50 Ω R LOAD
IOUT2
R LOAD
50 Ω
AGND