STLC7550TQFP 查看數據表（PDF） - STMicroelectronics

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STLC7550TQFP

LOW POWER LOW VOLTAGE ANALOG FRONT END

STMicroelectronics 

STLC7550

DEFINITION AND TERMINOLOGY

Data Transfer Interval

Signal Data

Data Mode

Control Mode

Frame Sync.

Frame Sync and

Sampling Period

ADC Channel

DAC Channel

OverSampling Ratio

Resolution

Dynamic Range

Signal-to-(Noise+Distortion)

Crosstalk

Power Supply Rejection Ratio

The time during which data is transfered from DOUT and to DIN. This

interval is 16 shift clocks provides by the chip.

This refers to the input signal and all the converted representations

through the ADC channel and the DAC channel.

This refers to the data transfer. Since the device is synchronous, the

signal data words from the ADC channel and to the DAC channel occur

simultaneously.

This refers to the digital control data transfer into DIN and the register

read data from DOUT. The control mode interval occurs when

requested by hardware or software.

Frame sync refers only to the falling edge of the signal which initiates

the data transfer interval. The primary frame sync starts the Data Mode

and the secondary frame sync starts the Control Mode.

The time between falling edges of successive primary frame sync

signals.

This term refers to all signal processing circuits between the analog

input and the digital conversion result at DOUT.

This term refers to all signal processing circuits between the digital

data word applied to DIN and the differential output analog signal

available at OUT+ and OUT- pins.

This term refer to the ratio between the master clock MCLK

corresponding to the oversampling frequency and the sampling

frequency FS.

The number of bits in the input words to the DAC, and the output words

in the ADC.

The S/(N+D) with a 1kHz, -20dBr input signal and extrapolated to full

scale. Use of a small input signal reduces the harmonic distortion

components of the noise to insignificance. Units in dB or in Nbit as

explained before.

S/(THD+N) is the ratio of the rms of the input signal to the rms of all

other spectral components within the measurement bandwidth

(0.425 x Sampling Frequency). Units in dB.

The amount of 1kHz signal present on the output of the grounded input

channel with 1kHz 0dB signal present on the other channel. Units

in dB.

PSRR. The amount of 1kHz signal present on the output of the

grounded input channel with 1kHz 200mVPP signal present on the

power supply.

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