SM8750AV

NIPPON PRECISION CIRCUITS—8

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.

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

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

RDCLK

START

Reset

VREF2

VREF2

Conversion voltage

(corresponds to

−0.5T)

Internal charge signal

Internal discharge signal

TVOUT output

RDCLK

START

Reset

VREF2

VREF2

Conversion voltage

(corresponds to +0.5T)

Internal charge signal

Internal discharge signal

TVOUT output