SM8750AV データシートの表示（PDF） - Nippon Precision Circuits

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SM8750AV

Data Jitter Measurement IC

Nippon Precision Circuits  

SM8750AV

Converter Coefficient Measurement Mode

When the serial interface bit GMES is set HIGH,

converter coefficient measurement mode is invoked.

In this mode, a voltage equivalent to a phase differ-

ence of ±0.5T, determined by the POLAR input bit,

is output on TVOUT. Internally, the difference in

pulsewidth between the charge/discharge signals is

±1T, where the charge pump circuit capacitance is

double the capacitance during normal operation in

order to generate outputs equivalent to phase differ-

ences of ±0.5T.

START

RDCLK

Internal charge signal

Internal discharge signal

TVOUT output

VREF2

Conversion voltage

(corresponds to −0.5T)

Reset

VREF2

Figure 3. Converter coefficient measurement mode timing (POLAR = LOW)

START

RDCLK

Internal charge signal

Internal discharge signal

TVOUT output

VREF2

Conversion voltage

(corresponds to +0.5T)

Reset

VREF2

Figure 4. Converter coefficient measurement mode timing (POLAR = HIGH)

NIPPON PRECISION CIRCUITS—8

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