ASNT7112-PQB


ASNT7112-PQB View full size
  • More than 6-bit accuracy within the full frequency range
  • Sampling speed above 2GS/s
  • Nominal 0dB differential gain with manual adjustment
  • Adjustable duty cycle and delay of the internal sampling clocks
  • Adjustable output common mode voltage level
  • Adjustable input bandwidth
  • Fully differential input and output data and clock buffers with on-chip 50Ohm termination
  • Dual -3.2V and +0.9V power supply
  • Total power consumption of 1.75W
  • Fabricated in SiGe for high performance, yield, and reliability
  • Standard 40-pin QFN package with a thermal pad

Function Operating Frequency Power, mW Package
Differential Sample-and-Hold Amplifier with 14GHz Input Analog Bandwidth DC-14 GHz 1750 40-pin QFN

DESCRIPTION

Fig. 1 Functional Block Diagram

The temperature stable and broadband ASNT7112-PQB SiGe IC is a high-speed sample-and-hold amplifier. The IC shown in Fig. 1 performs sampling of an input differential analog signal using two internally-generated strobe signals s1 and s2, and delivers a step-like differential signal to the output. It features an adjustable track period length controlled by the t1crl and t2crl pins. This allows for maximizing the length of the valid output step.

 

The differential gain of the chip is approximately 0dB, which corresponds to the single-ended-to-differential gain of -6dB. The gain is adjustable using the control pin gaincrl. The chip supports both AC-coupled and DC-coupled inputs. In the DC-coupled mode, the input common-mode voltage must be equal to vcc for optimal performance of the chip. The input sampled data path includes an equalizer that increases the bandwidth of the chip. The level of equalization is controlled with the varcrl pin.

 

The output buffer features an independent supply voltage vccob which allows for the adjustment of the output signal’s common mode voltage. The part’s outputs support the CML-type logic interface with an on-chip 50Ω termination to vcc and may be used differentially, AC/DC coupled, single-ended, or in any combination. The differential DC signaling mode is recommended for optimal performance.

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