FX105A Datasheet, PDF (13/16 Pages) CML Microcircuits – Tone Detector

Tone Detector
FX105A
Operating Characteristics
For the following conditions unless otherwise specified:
V_DD = 3.0V to 5.0V, Tamb = -40°C to +85°C, Load resistance on decoder output pin = 20kΩ
Notes Min. Typ.
Max.
Units
Static Parameters
I_DD
Amplifier Input Impedance
Digital Output Impedance
Analogue Output Impedance
2
-
0.9
3.0
mA
-
200
-
kΩ
-
500
-
Ω
-
1000
-
Ω
Dynamic Parameters
Input Signal
Amplitude
Frequency
Response Threshold
Deresponse Threshold
BW Range
Signal to Noise Performance
(f₀/2) Subharmonic Rejection
(5 f₀) Harmonic Rejection
VCO
Frequency
Frequency Stability (T_C)
Frequency Stability (V_C)
Amplifier
Open Loop Gain
Gain Bandwidth Product
Closed Loop Gain
2
-
-
40
-
1,2
-
30
1,2
-
10
4
5.6
-
-6
-9
-
30
-
20
1.0
20,000
-
-
10
-
-
-
Vrms
Hz
mVrms
mVrms
%f₀
dB
dB
dB
3
240
-
120,000
Hz
-
-100
-
ppm/°C
-
2330
-
ppm/V
-
60
-
-
1.0
-
-
0
-
dB
MHz
dB
Word Commutating Filter
Sensitivity (V_TH)
2
-
25.0
-
mVrms
Notes:
1. With diode (D₁) fitted.
2. For V_DD = 5V. Multiply by V_DD/5V for other supply values.
3. Observing pins 13, 14 or 15 (D4/P3 package) will cause a frequency shift due to additional
loading. If tuning the centre frequency by observing the VCO, design in a buffer amplifier
between pin 15 and the probe/calibration point and tune with no input signal. Otherwise, tune
by observing the detect output band edges while sweeping the input signal. The frequency at
pin 15 is 6xfo, while at pins 13 and 14 the frequency is 3xfo.
4. Adjust according to equation for R₂ in Section 1.6.2.
© 1999 Consumer Microcircuits Limited
13
D/105A/5