Datasheet MX105ALH, MX105AP, MX105ADW Datasheet (MX COM)

DATA BULLETIN

MX105A

FEATURES

•

Operates in High Noise Conditions

•

36 dB Signal Input Range

• ≥

High Sensitivity

•

Low Power Operation 2.7 V to 5.5 V

•

Adjustable Bandwidth

•

Adjustable Frequency

•

C4

C2

A

7 8

B

R2

4

Loop Filter

-

+

2

Input Amp

-

+

Timing

Logic

Tone Detector

PRELIMINARY INFORMATION

APPLICATIONS

•

Single and Multitone System

•

Applications

Tone In

1

C5

V/2

DD

3

Detect

Filter

+

-

R3

16

V

DD

C6

C3

A

5 6

C3

B

11

R4

12

VCO

1513

14

MX105A

Detect Counter

9

10

Detect

C1

The MX105A is a monolithic CMOS tone detector for tone decoding in single and multitone signaling systems. Using phase locked loop (PLL) decoding techniques, the MX105A recognizes tones in the presence of high noise levels and strong adjacent channel tones. Detection frequency and bandwidth can each be independently adjusted. The design is immune to high levels of harmonic and sub-harmonic noise. It also maintains excellent noise immunity and constant bandwidth over a wide range of input signal levels.

The MX105A requires a voltage supply of 2.7V to 5.5V and is available in the following package styles: 16-pin SOIC (MX105ADW), 16-pin PDIP (MX105AP), and 24-pin PLCC (MX105ALH).

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

R1

B

C1

A

R

L

Out

Tone Detector 2 MX105A PRELIMINARY INFORMATION

CONTENTS

Section..........................................................................................................................Page

1. Block Diagram ................................................................................................................3

2. Signal List .......................................................................................................................4

3. External Components ....................................................................................................5

4. General Description .......................................................................................................6

5. Application......................................................................................................................7

5.1 Method for Calculating External Component Values...............................................................7

5.2 Define f0..................................................................................................................................7

5.3 Calculate Minimum Usable Bandwidth....................................................................................7

5.4 Calculate The Recommended Operating Bandwidth..............................................................7

5.5 Select R4 for Operating BW....................................................................................................8

5.6 Calculate R2×C2A...................................................................................................................8

5.7 Define Maximum Allowed Response Time..............................................................................8

5.8 Calculate R3×C3A...................................................................................................................8

5.9 Calculate Maximum De-response Time..................................................................................9

5.10 Calculate Signal to Noise Performance...............................................................................10

5.11 Calculate C4 for 30° Phase Shift.........................................................................................10

6. Performance Specification ..........................................................................................11

6.1 Electrical Performance..........................................................................................................11

6.1.1 Absolute Maximum Ratings..........................................................................................................11

6.1.2 Operating Limits............................................................................................................................11

6.1.3 Operating Characteristics.............................................................................................................12

6.2 Packaging..............................................................................................................................13

MX•COM, Inc. reserves the right to change specifications at any time and without notice.

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Tone Detector 3 MX105A PRELIMINARY INFORMATION

1. Block Diagram

R4

C4

C2

R2

Tone In

R3

C5

V

C3

DD

C6

A

B

4

2

Input Amp

-

+

A

7 8

B

11

12

Loop Filter

-

VCO

1513

+

14

Timing

Logic

MX105A

1

V/2

DD

Detect Counter

3

Detect

Filter

+

-

9

16

5 6

10

Detect

C1

R1

B

C1

A

R

L

Out

Figure 1: Block Diagram

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Tone Detector 4 MX105A PRELIMINARY INFORMATION

2. Signal List

Pin No. Pin No. Name Type Description

DW/P LH

1 1 INPUT AMP IN input AC couple to this input. Nominal input

impedance is 200 kΩ. 2 3 INPUT AMP OUT output 3 5 R3 input Detect filter resistor pin. 4 6 R2 input PLL loop filter resistor pin. For improved

57 C3 68 C3 710 C2 811 C2

A B A B

output Detect filter capacitor pin A output Detect filter capacitor pin B output Loop filter capacitor pin A output Loop filter capacitor pin B

9 13 DETECT OUT output PMOS open drain output - active on detect.

10 14 V 11 16 R4 12 17 R4 13 19 C1 14 20 C1

SS

A B B A

power Ground.

input Bandwidth control resistor pin A

input Bandwidth control resistor pin B output VCO capacitor B output VCO capacitor A

15 22 R1 input VCO discharge resistor. When potentiometer

16 24 V

DD

power Power supply.

Nominal output impedance is 1 kΩ.

performance C4 may be chosen to provide 30° of phase shift at the loop filter input.

tuning is required, a series resistor is recommend to prevent possible shorting to ground.

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Tone Detector 5 MX105A PRELIMINARY INFORMATION

3. External Components

V

R1

DD

C6

V

Signal Input

C4

C3

C2

C5

1

2

R3

3

R2

4

MX105A

5

A

B

A

B

D1

6

7

8

16

15

14

13

12

11

10

R1

F

C1

A

C1

B

R4

V

SS

R

L

9

Detect Out

Figure 2: Recommended External Components

R1

See Section 5.2

F

300k

Ω

C2

See section 5.6

A

Note 2

R1

See Section 5.2

V

100k

Ω

C2

See Section 5.6

B

Note 2

R2 See Section 5.6 C3

See Section 5.8

A

Note 2

R3 See Section 5.8 C3

See Section 5.8

B

Note 2

R4 See Section 5.5 C4 See Section 5.11

Note 1, 2

R

C1

L

A

Note 4

See Section 5.2

20k

±20% C5 0.27µF ±20%

Ω

C6 0.1µF ±20%

Note 2

C1

See Section 5.2

B

Note 2

D1 See Section 5.9

Note 3

small signal

diode (1N914)

External Components Notes:

1. For improved performance, C4 may be chosen to provide 30° phase shift at the VCO loop filter input.

2. For compatibility with the MX105; capacitors (C1 - C4) may be connected to V

instead of VSS.

DD

3. For improved de-response time, a diode (D1) may be added.

4. Any value load resistance (R

) may be used, providing the maximum load current does not exceed the value

L

given in ‘Maximum Ratings Specifications’.

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Tone Detector 6 MX105A PRELIMINARY INFORMATION

4. General Description

The MX105A implements a frequency detector with a phase locked loop (PLL) and a lock detector. The voltage controlled oscillator (VCO) center frequency, detection bandwidth, loop filter, and detect filter are all independently controlled by external components.

The MX105A provides a pair of pseudo-sinewave multipliers for splitting the input signal into approximately orthogonal components. These multipliers are implemented with commutating filters (cyclically sampling filters) which translate an in band AC input signal to DC. The commutating loop filter is used as the phase detector of the PLL while the commutating detect filter provides for lock detection. Each pseudo-sinewave has a cyclic form (1 1 0 -1 -1 0) to eliminate low order harmonic responses. The loop filter produces an error signal, which when applied to the VCO input allows frequency locking. A limiter between the loop filter output and the VCO input provides tunable control of the detection bandwidth (BW). Once lock is achieved the detect filter produces a DC value proportional to the input tone amplitude. An internally generated reference is compared to the detect filter output to determine whether the PLL is locked to an input tone. Once lock is determined the internal reference is reduced by 50% to minimize output chatter with marginal input signals.

The sampling clocks of the detect filter lag those of the loop filter by 60°. To improve performance, a capacitor (C4) can be used to phase shift the input to the loop filter by 30°. This shifts all sampling clocks an additional 30° relative to the input tone to phase align the detect filter sampling clocks with the amplitude peaks of the input tone.

Figure 3 shows the sampling clocks relative to an in band input tone; this figure represents the steady state ‘locked’ condition without C4.

Internal Clock

Logic 1 indicates sampling period

Segment

Input T one

C2 C2 C3 C3

5

4

B

A

B

Figure 3: Sampling Clocks of Commutating Filters

6123456123456123

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Tone Detector 7 MX105A PRELIMINARY INFORMATION

5. Application

The external components shown in Figure 2 are used to adjust the various performance parameters of the MX105A. The signal-to-noise performance, response time and signal bandwidth are all interrelated factors which should be optimized to meet the requirements of the application.

By selecting component values in accordance with the following formulas, optimum circuit performance is obtained for any given application.

First define the following application parameters:

A. The center frequency to be detected (f B. The MX105A Minimum Usable Bandwidth (MUBW). This is obtained by taking into account the worst case

tolerances on the input tone frequency and variations in the MX105A f

effect of the MX105A and its supporting components. C. The maximum permissible MX105A response time. D. The minimum input signal amplitude.

Note: Using this information the appropriate component values can be calculated, and the signal-to-noise performance

can be read from a chart. Do not add large safety margins for response time and minimum signal amplitude; reasonable margins are already included in the formulas. Excessive margins may result in reduced noise immunity.

5.1 Method for Calculating External Component Values

The examples on the following pages demonstrate the calculation of component values for any given application. For the purpose of the examples, the values below are used:

A. f

= 2800 Hz

0

B. ∆TEMP = 100 °C, ∆ V C. Maximum allowed response time = 50ms D. Minimum input signal amplitude = 200 mV

= 1V, ∆fIN = 0.5%

DD

).

0

due to supply voltage and any temperature

0

.

RMS

5.2 Define f

The components R1, C1

0

and C1B set the free running frequency of the VCO and therefore the f0 of the MX105A. As

A

shown below, the frequency of 2800 Hz corresponds to a capacitor value of 220pF and a resistor value of 385 kΩ. This resistance can be achieved with a 300 kΩ fixed resistor for R1 C1

and C1B should include 10-20pF parasitic capacitance due to the device and its package plus any board parasitic

A

and for R1V a 100 kΩ potentiometer. The capacitance of

F

capacitance.

=

f

0

⋅+

K R1(C1 C1 )

1

AB

⇒× =

R1 C1

A

2Kf

1

0

where : K = 2.1 ± 5%

R1 = (R1

+ R1V)

F

5.3 Calculate Minimum Usable Bandwidth

Minimum Usable Bandwidth (MUBW) is the TOTAL bandwidth required for the following:

A. Input signal frequency tolerance B. MX105A f C. MX105A f

Note: Add A, B and C and express as TOTAL bandwidth, not as a ± percentage (%) value.

temperature coefficient (TC = 100 ppm/°C)

0

supply voltage coefficient (VC = 5000 ppm/V)

0

MUBW f TEMP V= + T + V

∆∆ ∆

0

CC

MUBW = 0.5 + 0.01 100 + 0.5 1 = 2%

××

5.4 Calculate The Recommended Operating Bandwidth

+

10 MUBW210 2

=

BW

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+

=

6%

2

Tone Detector 8 MX105A PRELIMINARY INFORMATION

5.5 Select R4 for Operating BW

R4

=

10.35 BW

=

−

×

4.8 BW

The exact bandwidth given by any value of R4 will vary slightly. In applications where an exact bandwidth is required, R4 should be a variable resistor to permit adjustment.

×

4.8 6

10.35 6

−

≈Ω

6.8k

5.6 Calculate R2×C2

For a frequency of 2800 Hz, a bandwidth of 6%, and a choice of

A

×≈

R2 C2

A

100

××

3f BW

0

=⇒=µΩ

C2 0.01 F R 200k

AV

.

Note: Use nearest preferred values.

5.7 Define Maximum Allowed Response Time

The maximum response time (TON) is the sum of the VCO lock time (T The MX105A’s T

must not exceed the maximum time allowed for the application, but a value lying near the maximum

ON

gives the best S/N performance.

A. Calculate T

LOCK

T

LOCK

150

=

×

fBW

0

Using the formula above, for a frequency of 2800 Hz and a bandwidth of 6% the approximate Lock time (T ms. Since the maximum response time is 50 ms, a DETECT time of 41 ms is allowed.

Note: T

B. Calculate Maximum Allowable T

C. Define Minimum Expected Signal Amplitude

This is used in calculating T

may vary from near zero to the value given, causing corresponding variations in actual TON.

LOCK

DETECT

components.

TTT

DETECT ON LOCK

()

=−

V

IN

MIN

MAX

) and the DETECT integration time (T

LOCK

DETECT

) will be 9

).

5.8 Calculate R3×C3

A

Note:

1. For a signal amplitude of 200 mV a T

DETECT

time of 20ms. This in turn yields a response time of 9ms + 20 ms = 29ms.

2. Use nearest preferred values.

T

R3 C3

×≈

A

where: V

, a resistor value R3 of 510 kΩ with a 0.1µF capacitor for C3A and C3B will yield

RMS

is the detect filter sensitivity.

TH

DETECT

 

3ln1

−× −





V

IN

TH

MIN

 





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Tone Detector 9 MX105A PRELIMINARY INFORMATION

5.9 Calculate Maximum De-response Time

T3ln

≈− ×

OFF

where: V

is the detect filter sensitivity.

TH

 







V

TH



V



IN

MAX

R3 C3

×

A

For improved de-response time, a diode (1N914 or similar) can be placed between pins 5 and 6, as shown in Figure 3. The formula and figure below show the approximate time the MX105A will take to turn off after an in-band signal has been removed. The effect of this diode is to greatly reduce the turn-off time with signal input amplitudes greater than 300 mV

. This graph is for VDD = 5V; for lower VDD KDT increases.

RMS

≈××

T K R3 C3

OFF

3.8

3.6

3.4

3.2

3.0

2.8

De-response with Diode

DT A

K = Number of RCTime Constants for

DT

2.6

2.4

2.2

0 80 160 240 320 400 480 560 640 720

Figure 4: K

Factor for T

DT

Input Signal Level (mV )

vs. Signal Input Amplitude

OFF

RMS

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Tone Detector 10 MX105A PRELIMINARY INFORMATION

g

5.10 Calculate Signal to Noise Performance

Worst-case S/N calculations depend on calculation of a value “M” using the formula shown below:

R3 C3

×

00185.

A

=

.

M =

∞

M = 1

M

=

3R2C2

××

substituting example values,

510 0.1

=

M

××

3200

By substituting this value for M in Figure 5, the minimum required S/N of an in band tone with respect to an adjacent interfering tone can be found. This then has to be increased depending on the input tone amplitude.

-28

-24

-20

M = 0.33

-16 M = 0.1

-12

-8

-4

0

1

24

6810

Number of Bandwidths Separation

Figure 5: S/N vs. BW Separation

The following formula expresses the reduction in noise immunity as the input signal approaches the detect filter sensitivity

.

V

TH

required

S

= 20lo

N



V



VV



IN TH

  

+

S N

Figure 5

IN

−

If this S/N is better than required for the application, R3×C3

can be reduced, or the operating bandwidth can be

A

increased to obtain a faster tone detection time. If the S/N performance is not adequate, the operating bandwidth can be reduced toward the MUBW, or R3C3

can be

A

increased to improve S/N performance at the expense of slower response time.

5.11 Calculate C4 for 30° Phase Shift

Capacitor C4 is used to phase shift the input to the VCO commutating filter by 30°, thereby shifting the sampling clocks by the same amount. This enables the Detect sampling filter to sample and integrate at the maximum and minimum of the input tone.

°

C4

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××

π

2f

R R

0V0V

tan(30 )

=

≈

0.092

×

f

≈

164pF

Tone Detector 11 MX105A PRELIMINARY INFORMATION

6. Performance Specification

6.1 Electrical Performance

6.1.1 Absolute Maximum Ratings

Exceeding these maximum ratings can result in damage to the device.

General Min. Max. Units

Supply (VDD - VSS) -0.3 7.0 V Voltage on any pin (wrt VSS) -0.3 V Current

V

DD

V

SS

-30 30 mA

Any other pins -20 20 mA

Max. Output Switch Load Current 10 mA

P/LH/DW Package

Device Dissipation at T

= 25°C 800 mW

AMB

Derating above 25°C 13 mW/°C above 25°C Storage Temperature -40 85 °C Operating Temperature -30 85 °C

+ 0.3 V

DD

6.1.2 Operating Limits

Correct operation of the device outside these limits is not implied.

Notes Min. Typ. Max. Units

Supply (VDD - VSS) 2.7 3.3/5.0 5.5 V Operating Temperature -30 85 °C

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Tone Detector 12 MX105A PRELIMINARY INFORMATION

6.1.3 Operating Characteristics

For the following conditions unless otherwise specified:

V

= 5.0 V @ T

DD

AMB

= 25°C

Load resistance on decoder output = 20kΩ.

Notes Min. Typ. Max. Units

Static Parameters

I

DD

Amplifier Input Impedance 160 200 Digital Output Impedance 500 1000 Analog Output Impedance 1000 1200

1.0 mA k

Ω Ω Ω

Dynamic Parameters

Input Signal

Frequency 40 20,000 Hz Lowest Must Detect Level 1 30 mV Highest Will Not Detect Level 1 20 mV Highest Will Not Detect f0/2 1, 2 30

790

Highest Will Not Detect 5(f0) 1, 2 20

250

mV

RMS RMS

dB

RMS

dB

RMS

VCO

Frequency 3 120 120,000 Hz Frequency Stability 100 ppm/°C

5000 ppm/V

BW Limiter

BW Range 2 10 %f

0

Amplifier

Open Loop Gain 60 dB GBWP 1.0 MHz Closed Loop Gain 0 dB

Detect Commutating Filter

Sensitivity (VTH)125mV

RMS

Operating Characteristics Notes:

1. Multiply by V

2. The reference level is V

/5V for other supply values.

DD

. The following formula converts dB to mV

TH

mV = V

RMS

10

(dB/20)

×

RMS

TH

.

3. Observing pins 13, 14, or 15 (DW/J package) will cause a frequency shift due to additional loading. If tuning center frequency by observing oscillator, design in a buffer amplifier between pin 15 and probe/calibration point and tune with no input signal. Otherwise, tune by observing detect output band edges while sweeping input signal. VCO center frequency is 6(f

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

) at pin 15 while it is 3(f0) at pins 13 and 14.

0

Tone Detector 13 MX105A PRELIMINARY INFORMATION

6.2 Packaging

Package Tolerances

ALTERNATIVE

LOCATION MARKING

Y

H

A

B

E

PIN 1

X

K

C

P

J

Figure 6: 16-pin SOIC Mechanical Outline:

W

Z

DIM.

A B C E H

L

T

Order as part no. MX105ADW

J

K L P T

W

X Y Z

NOTE: All dimensions in inches (mm.)

TYP.

0.395 (10.03)

0.286 (7.26)

0.390 (9.90)

0.013 (0.33) 0.020 (0.51)

0.041 (1.04)

0.016 (0.41)

0.050 (1.27)

0.009 (0.23) 0.0125 (0.32) 45°

0° 10° 5°

5°

Angles are in degrees

MAX.MIN.

0.413 (10.49)

0.299 (7.59)

0.105 (2.67)0.093 (2.36)

0.419 (10.64)

0.020 (0.51)0.003 (0.08)

0.050 (1.27)

7°

Figure 7: 16-pin PDIP Mechanical Outline:

Pac kageTolerances

DIM.

A

0.740 (18.80)

0.240 (6.10)

B

0.135 (3.43)

C

0.300 (7.62)

E

0.290 (7.37) 0.325 (8.26)

E1

0.015 (0.38) 0.070 (1.77)

H

0.014 (0.35) 0.023 (0.58)

J

0.040 (1.02) 0.065 (1.65)

J1

0.056 (1.42) 0.064 (1.63)

K

0.121 (3.07)

L

P

0.008 (0.20) 0.015 (0.38)

T

Y

NOTE : All dimensions in inches (mm.)

Order as part no. MX105AP

Angles are in degrees

TYP. MAX.MIN.

0.810 (20.57)

0.262 (6.63)

0.200 (5.06)

0.390 (9.91).

0.150 (3.81)

0.100 (2.54)

7e

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Tone Detector 14 MX105A PRELIMINARY INFORMATION

D

E B

Y

A

W

PIN 1

P

G

C

K

J

T

H

Packa geTolerances

TYP. MAX.MIN.DIM.

0.380 (9.61)

A

0.380 (9.61)

B

0.128 (3.25)

C

0.417 (10.60)

D

0.417 (10.60)

E F G H

J

0.047 (1.19)

K

0.049 (1.24)

P

0.006 (0.152)

T

30°

W

Y

NOTE: All dimensions in inches (mm.)

0.250 (6.35)

0.023 (0.58)

Angles are in degrees

0.409 (10.40)

0.146 (3.70)

0.435 (11.05)

0.022 (0.55)0.018 (0.45)

0.048 (1.22)

0.051 (1.30)

0.009 (0.22)

45°

6°

F

Figure 8: 24-pin PLCC Mechanical Outline:

Order as part no. MX105ALH

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Datasheet MX105ALH, MX105AP, MX105ADW Datasheet (MX COM)

Specifications and Main Features

Frequently Asked Questions

User Manual