THS3217 Datasheet, PDF (51/73 Pages) Texas Instruments – THS3217 DC to 800-MHz, Differential-to-Single-Ended, DAC Output Amplifier

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THS3217
SBOS766B – FEBRUARY 2016 – REVISED FEBRUARY 2016
Device Functional Modes (continued)
9.4.3 Differential I/O Voltage Mode
Having two amplifiers available also allows a simple differential I/O implementation with independent output
common-mode control, as shown in Figure 94. In this configuration, the D2S provides one side of the differential
output, while simultaneously driving the OPS configured in an inverting gain of –1 V/V to provide the differential
output on the other side. The output at VMID_OUT biases the external noninverting input, VIN+ (pin 9). This
circuit configuration places the differential input to the output filter at a common-mode voltage, V_{MID_OUT}.
VMID_OUT
VO1
16
15
+ _{VMID_IN}
±
1
50 k
2 x1
50 k
x1
50
49.9
Differential
V_IN
+
250
500
3 x1
49.9
14
100
13
18.5 k
274
12
274
11
VOUT
Differential
Filter
Differential
Input Mixer
10
18.5 k
VPATHSEL > 1.3V
4
9
VMID_OUT
5
6
7
8
VO1
Figure 94. Differential I/O Configuration With Independent Output Common-Mode Voltage Control
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