Tone Decoder. XR-567 Datasheet

XR-567 Decoder. Datasheet pdf. Equivalent


Exar XR-567
XR·567
Monolithic Tone Decoder
GENERAL DESCRIPTION
The XR-567 is a monolithic phase-locked loop system
designed for general purpose tone and frequency de-
coding. The circuit operates over a wide frequency
band of 0.01 Hz to 500 kHz and contains a logic com-
patible output which can sink up to 100 milliamps of
load current. The bandwidth, center frequency, and out-
put delay are independently determined by the selec-
tion of four external components.
FUNCTIONAL BLOCK DIAGRAM
OUTPUT
fll HR
lOW PASS
lOOP Fll HR
The circuit consists of a phase detector, low-pass filter,
and current-controlled oscillator which comprise the
basic phase-locked loop; plus an additional low-pass
filter and quadrature detector that enables the system
to distinguish between the presence or absence of an
input signal at the center frequency.
FEATURES
Bandwidth adjustable from 0 to 14 %.
Logic compatible output with 100 mA current sinking
capability
High stable center frequency.
Center frequency adjustable from 0.01 Hz to 500 kHz
Inherent immunity to false signals
High rejection of out-of-band signals and noise
Frequency range adjustable over 20:1 range by exter-
nal resistor.
APPLICATIONS
Touch-ToneQ!l Decoding
Sequential Tone Decoding
Communications Paging
Ultrasonic Remote-Control
Telemetry Decoding
ABSOLUTE MAXIMUM RATINGS
Power Supply
10 volts
Power DisSipation (package limitation)
Ceramic Package
385 mW
Plastic Package
300 mW
Derate Above + 25°C
2.5 mW/oC
Temperature
Operating
XR-567M
- 55°C to + 125°C
XR-567CN/567CP
O°C to + 70°C
Storage
- 65°C to + 150°C
ORDERING INFORMATION
Part Number
XR-567M
XR-567CN
XR-567CP
Package
Ceramic
Ceramic
Plastic
Operating Temperature
-55°C to +125°C
O°C to + 70°C
O°C to + 70°C
SYSTEM DESCRIPTION
The XR-567 monolithic tone decoder consists of a
phase detector, low pass filter, and current controlled
oscillator which comprise the basic phase-locked loop,
plus an additional low pass filter and quadrature detec-
tor enabling detection on in-band signals. The device
has a normally high open collector output capable of
sinking 100 mA.
The input signal is applied to Pin 3 (20 kO nominal input
resistance). Free running frequency is controlled by an
RC network at Pins 5 and 6 and can typically reach 500
kHz. A capacitor on Pin 1 serves as the output filter and
eliminates out-of-band triggering. PLL filtering is ac-
complished with a capacitor on Pin 2; bandwidth and
skew are also dependant upon the circuitry here. Band-
width is adjustable from 0 % to 14 % of the center fre-
quency. Pin 4 is + VCC (4.75 to 9V nominal, 10V maxi-
mum); Pin 7 is ground; and Pin 8 is open collector out-
put. pulling low when an in-band signal triggers the
device.
In applications requiring two or more 567-type devices,
consider the XR-2567 dual tone decoder. Where center
frequency accuracy and drift are critical, compare the
XR-567A. Investigate employing the XR-L567 in low
power circuits.
6-96


XR-567 Datasheet
Recommendation XR-567 Datasheet
Part XR-567
Description Monolithic Tone Decoder
Feature XR-567; XR·567 Monolithic Tone Decoder GENERAL DESCRIPTION The XR-567 is a monolithic phase-locked loop sy.
Manufacture Exar
Datasheet
Download XR-567 Datasheet




Exar XR-567
XR·567
ELECTRICAL CHARACTERISTICS
= =Test Conditions: VCC + 5V. TA 25°C, unless otherwise specified. Test circuit of Figure 2.
PARAMETERS
LIMITS
MIN TYP
MAX
UNITS
CONDITIONS
GENERAL
Supply Voltage Range
Supply Current
Quiescent XR-567M
XR-567C
Activated XR-567M
XR-567C
Output Voltage
Negative Voltage at Input
Positive Voltage at Input
4.75
9.0 V dc
6 8 mA RL = 20kO
7 10 mA RL = 20 kO
11 13 mA RL = 20 kO
12 15 mA RL = 20 kO
15 V
-10
V
VCC + 0.5
V
CENTER FREQUENCY
Highest Center Frequency
Center Frequency Stability
Temperature TA = 25°C
o < TA < 70°C
-55 < TA < + 125°C
Supply Voltage
XR-567M
XR-567C
100 500
kHz
35
±60
± 140
ppm/oC See Figure 9
ppm/oC See Figure 9
ppm/oC See Figure 9
0.5 1.0 %/V fo = 100 kHz
0.7 2.0 %/V fo = 100 kHz
DETECTION BANDWIDTH
Largest Detection Bandwidth
XR-567M
XR-567C
Largest Detection Bandwidth Skew
XR-567M
XR-567C
Largest Detection Bandwidth Variation
Temperature
Supply Voltage
12
10
14
14
1
2
±0.1
±2
16 % of fo fo = 100kHz
18 % of fo fo = 100 kHz
2 % of fo
3 % offo
%/OC Vin = 300 mV rms
%/V Vin = 300 mV rms
INPUT
Input Resistance
Smallest Detectable Input Voltage
Largest NO-Output Input Voltage
Greatest Simultaneous Outband
Signal to Inband Signal Ratio
Minimum Input Signal to Wideband
Noise Ratio
20
20
10 15
+6
-6
kO
25 mVrms IL = 100 mA, fi = fo
mVrms IL = 100 mA, fi = fo
dB
dB Bn = 140 kHz
OUTPUT
Output Saturation Voltage
Output Leakage Current
Fastest ON-OFF CYCling Rate
Output Rise Time
Output Fall Time
0.2
0.6
0.01
fo/20
150
30
0.4
1.0
25
V IL = 30 mA, Vin = 25 mV rms
V 'L = 100 mA, Vin = 25 mV rms
p,A
ns RL = 500
ns RL = 500
I
6-97



Exar XR-567
DEFINITION OF XR·567 PARAMETERS
CENTER FREQUENCY fo
fo is the free-running frequency of the current-
controlled oscillator with no input signal. It is deter-
mined by resistor R1 between pins 5 and 6, and capaci-
tor C1 from pin 6 to ground fo can be approximated by
fo == _1_
R1 C1
where R1 is in ohms and C1 is in farads.
DETECTION BANDWIDTH (BW)
The detection bandwidth is the frequency range cen-
tered about fo, within which an input signal larger than
the threshold voltage (typically 20 mV rms) will cause a
logic zero state at the output. The detection bandwidth
corresponds to the capture range of the PLL and is de-
termined by the low-pass bandwidth filter. The band-
width of the filter, as a percent of fo, can be determined
by the approximation
j IBW = 1070 - i
foC2
where Vi is the input signal in volts, rms, and C2 is the
capacitance at pin 2 in poF.
LARGEST DETECTION BANDWIDTH
The largest detection bandwidth is the largest frequen-
cy range within which an input signal above the thresh-
old voltage will cause a logical zero state at the output.
The maximum detection bandwidth corresponds to the
lock range of the PLL.
DETECTION BAND SKEW
The detection band skew is a measure of how accu-
rately the largest detection band is centered about the
center frequency, fo. It is defined as (fmax + fmin - 2
fo)lfo, where fmax and fmin are the frequencies corre-
sponding to the edges of the detection band. If neces-
sary, the detection band skew can be reduced to zero
by an optional centering adjustment. (See Optional
Controls).
DESCRIPTION OF CIRCUIT CONTROLS
OUTPUT FILTER - C3 (Pin 1)
Capacitor C3 connected from pin 1 to ground forms a
simple low-pass post detection filter to eliminate spuri-
ous outputs due to out-of-band signals. The time con-
stant of the filter can be expressed as T3 = R3C3,
where R3 (4.7 kO) is the internal impedance at pin 1.
The precise value of C3 is not critical for most applica-
tions. To eliminate the possibility of false triggering by
spurious signals, it is recommended that C3 be C!!: 2 C2,
where C2 is the loop filter capacitance at pin 2.
XR·567
If the value of C3 becomes too large, the turn-on or
turn-off time of the output stage will be delayed until the
voltage change across C3 reaches the threshold volt-
age. In certain applications, the delay may be desirable
as a means of suppressing spurious outputs. Con-
versely, if the value of C3 is too small, the beat rate at
the output of the quadrature detector (see FunctionEd
Block Diagram) may cause a false logic level change
at the output. (Pin 8)
The average voltage (during lock) at pin 1 is a function
of the inband input amplitude in accordance with the
given transfer characteristic.
Vcc
<5V
~~F_+__~________~
0.01 IJF 3
0---1
I 10.005
0.02
XA 567
2.4K
• Adlust lor 10 100 kHz
I,: 100 kHI. '5V
c'
1°·0033
Figure 2. XR·567 Test Circuit
INPUT 0---1
LOW PASS
FI LTE A .-----<J--i
XA 567
Figure 3. XR·567 Connection Diagram
6-98







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