THS3217 Datasheet, PDF (50/73 Pages) Texas Instruments – THS3217 DC to 800-MHz, Differential-to-Single-Ended, DAC Output Amplifier

THS3217
SBOS766B – FEBRUARY 2016 – REVISED FEBRUARY 2016
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Device Functional Modes (continued)
9.4.2 Dual-Output Mode
The D2S stage can also be used to directly drive a doubly-terminated line, as shown in Figure 93. In addition, the
OPS amplifies the internal D2S output by 5 V/V. The internal path to the OPS is selected with PATHSEL (pin 4)
at ground, and the OPS gain is increased to 5 V/V. A 2-V_PP output at VO1 produces a 10-V_PP output at VOUT
(pin 11). This 10-V_PP swing requires higher supply operation to provide sufficient headroom in the OPS output
stage in order to preserve signal integrity. A power supply of ±7.5 V provides adequate headroom.
49.9
Differential
V_IN
49.9
16
15
1
50 k
2 x1
50 k
x1
50
+
250
500
3 x1
14
100
4
13
18.5 k
34.8
12
140
49.9
11
AV = 10 V/V
To
50-Ÿ /RDG
10
18.5 k
9
5
6
7
8
AV = 2 V/V
To
50-Ÿ /RDG
49.9
Figure 93. Dual-Output Mode
A simple modification to the circuit in Figure 93 is to disable the OPS, and switch to the external input path by
taking both logic lines (pin 4 and pin 10) high. The D2S output at VO1 is then used either directly or through a
filter to an even higher power driver like the ±15-V THS3091.
50
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