TS3001
BLOCK DIAGRAM
where the scalar k is approximately 9.09E3. With an
THEORY OF OPERATION
RSET
=
4.32MΩ, the output frequency is
approximately 25kHz with a 50% duty cycle. As
design aids, Tables 1 lists TS3001’s typical FOUT for
The TS3001 is a user-programmable oscillator where
the period of the square wave at its FOUT terminal is
generated by an external resistor. The output
frequency is given by:
various standard values for RSET
.
The TS3001 also provides a separate PWM output
signal at its PWMOUT terminal that is anti-phase with
respect to FOUT. In addition, applying a voltage at
the CNTRL both enables the TS3001’s internal PWM
engine as well as adjusting the duty cycle from 12%
to 90%. A dc control voltage equal to 0.03 x VDD
applied to the CNTRL pin enables the PWM engine
to set the duty cycle to 12%. A dc control voltage
equal to 0.27 x VDD increases the duty cycle to 90%
and connecting CNTRL to VDD disables the PWM
engine altogether. Configured for nominal operation
(PWM engine OFF), the supply current of the TS3001
is 1µA; enabling the PWM engine increases the
TS3001 operating supply current as shown in the
electrical specification table.
1
1ꢁꢂ
FOUT (kHz) =
ꢀ
tFOUT (ꢀs) k x RꢃꢁT MΩ
ꢁ
ꢂ
Table 1: FOUT vs RSET
RSET (MΩ) FOUT (kHz)
1
110
44
25.5
16
2.49
4.32
6.81
9.76
11
TS3001DS r1p0
Page 7
RTFDS
TOUCHSTONE [ TOUCHSTONE SEMICONDUCTOR INC ]
