DC to 650-MHz, Differential-to-Single-Ended, DAC Output Amplifier | RGV | 16 | -40 to 85

The THS3215 combines the key

signal-chain components required to interface with a complementary-current output,

digital-to-analog converter (DAC).

The flexibility provided by this two-stage amplifier

system delivers the low distortion, dc-coupled, differential to single-ended signal

processing required by a wide range of systems.The input stage buffers the DAC

resistive termination, and converts the signal from differential to single-ended

with a fixed gain of 2 V/V. The differential to single-ended output is available

externally for direct use, and can also be connected through an RLC filter or

attenuator to the input of an internal output power stage (OPS). The wideband,

current-feedback, output power stage provides all pins externally for flexible gain

setting.

An internal 2 × 1 multiplexer (mux) to

the output power stage noninverting input provides an easy means to select between

the internal differential-to-single-ended stage (D2S) output or an external

input.

An optional on-chip midsupply buffer

provides a wideband, low-output-impedance source for biasing during single-supply

operation through the signal-path stages. This feature provides very simple biasing

for single-supply, ac-coupled applications operating up to a maximum 15.8-V supply.

An external input to this buffer allows for a dc error-correction loop, or a simple

output dc offset feature.

A companion device, the THS3217, provides the same functional features at higher quiescent power

and bandwidth. The THS3215 and THS3217 support the emerging high-speed Texas

Instruments DACs for AWG applications, such as the DAC38J82.