Input Characteristics For Enable / Disable Function (Pad 8)
Parameter
Enable Voltage (High) or open circuit
Disable Voltage (Low) Output Tri-stated
(Vih)
(Vil)
Minimum
70% Vcc
-
Nominal
-
-
Maximum
-
30% Vcc
Units
Vdc
Vdc
Notes
10
Input Characteristics For Voltage Control (Pad10)
Parameter
Control Voltage Range (Vcc = 3.3V)
Frequency Tuning
Linearity
Input Impedance
Modulation Bandwidth (3dB)
Slope
(Vc)
Minimum
0.3
±10
±5
100K
10
Nominal
1.65
-
-
-
-
Positive
Maximum
3.0
-
-
-
-
Units
Vdc
ppm
%
Ohm
KHz
Notes
11
LVCMOS Output Characteristics
LOAD
Voltage
(High)
(Low)
Current
(High)
(Low)
Duty Cycle at 50% of Vcc
Rise / Fall Time 10% to 90%
Parameter
(Voh)
(Vol)
(Ioh)
(Iol)
Minimum
-
90%Vcc
-
-4
-
45
-
Nominal
15
-
-
-
-
50
-
Maximum
-
-
10%Vcc
-
4
55
8
Units
pF
Vdc
Vdc
mA
mA
%
ns
Notes
12
Clipped Sinewave Output Characteristics
Load
Output Load Resistance
Output Load Capacitance
Output Voltage (< 40 MHz)
Output Voltage (> 40 MHz)
Notes:
1.
Frequency stability vs. change in temperature. [±(Fmax – Fmin)/2.Fo].
2.
Inclusive of frequency stability, supply voltage change (±1%), aging, for 24 hours.
3.
Over twenty years
4. TCXO: Initial calibration @ 25°C. Specifications at time of shipment after 48 hours of operation.
5. Frequency change after reciprocal temperature ramped over the operating range. Frequency measured before and after at 25°C.
6 Inclusive of calibration @ 25°C, frequency vs. change in temperature, change in supply voltage (±5%), load change (±5%), reflow soldering process
and 20 years aging.
7. For best in application performance, careful selection of an external power source is critical. Select an external regulator that meets or exceeds to
following specifications regarding voltage regulation tolerance, initial accuracy, temperature coefficient, voltage noise, and low voltage noise density
Factory Test Conditions:
Initial Accuracy ±2mv, Noise (0.1Hz to 10 KHz) 15uV p-p, Voltage Noise Density = 50nV/srt Hz, Temperature Coefficient
< 5ppmºC.
8. Phase noise measurements Fo = 20 MHz, other frequencies may vary by 20log F/20MHz.
9. Typical start up time for the frequency range of 12.8 MHz to 25 MHz <330 us.
10. Leave Pad 8 unconnected if enable / disable function is not required. When tri-stated, the output stage is disabled but the oscillator and compensation
circuit are still active (current consumption < 1mA).
11. Additional pull ranges are available; please contact the factory for additional information.
12.
Attention: To achieve optimal frequency stability, and in some cases to meet the specification stated on this data sheet, it is required that the circuit connected to this TCXO output
must have the equivalent input capacitance that is specified by the nominal load capacitance. Deviations from the nominal load capacitance will have a graduated effect on the stability
// GPIOBeep.cpp : Defines the class behaviors for the application.
//#include "stdafx.h"
#include "GPIOBeep.h"
#include "GPIOBeepDlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char ...
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Embedded System
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