FX621 データシートの表示（PDF） - CML Microsystems Plc

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FX621

Low-Power Subscriber Private Metering (SPM) Detector

CML Microsystems Plc 

Specification

Absolute Maximum Ratings

Exceeding the maximum rating can result in device damage. Operation of the device outside the operating limits is not

implied.

Supply Voltage

Input Voltage at any pin (ref V = 0V)

SS

Sink/source current (supply pins)

(other pins)

Total

device

dissipation

@

T

AMB

25°C

Derating

-0.3 to 7.0V

-0.3 to (V + 0.3V)

DD

± 30mA

± 20mA

800mW Max.

10mW/°C

Operating temperature range:

Storage temperature range:

FX621P/LG/LS

FX621P/LG/LS

-30°C to + 70°C

-40°C to + 85°C

Operating Limits

All device characteristics are measured under the following conditions unless otherwise specified :

V = 3.5V

DD

T

AMB

= 25°C

Xtal/Clock f = 4.433619MHz

C

Audio level 0dB ref = 775mV rms

Characteristics

System See Note

Min.

Typ.

Max.

Static Values

Supply Voltage (V )

DD

Supply Current (I )

DD

Input Logic “1”

Input Logic “0”

Output Logic “1”

Output Logic “0”

Impedances

"Gain Set" Amplifier Input

"Gain Set" Amplifier Output

Analogue Detector Input

Digital Inputs

Digital Output

Dynamic Values

Sensitivity

12kHz/16kHz 1, 2

Required Signal to Noise Ratio

7

Upper Detector Threshold

2

Lower Detector Threshold

2

Amplifier Input Offset

Xtal Oscillator Frequency

Frequency Discrimination

'Will-Decode' Frequency Limits

12kHz

16kHz

'Will-Not Decode' Frequency Limits 12kHz

12kHz

16kHz

16kHz

Timing Information – Fig.3

Valid Tone Burst Length (t )

M

Valid Space Length (t )

S

Tone Response Time (t )

R

12/16kHz

3, 4

12/16kHz

4

12kHz

5, 7

16kHz

5, 7

De-response Time (t )

D

12kHz

6, 7

16kHz

6, 7

SPM Output Reset Time (t )

12/16kHz

4

RESET

3.5

–

70.0

0

80.0

–

1.0

–

1.0

0.5

–

–

–

2.06

1.36

–

11.82

15.76

0

12.48

0

16.64

16.0

5.0

–

–

–

–

150.0

–

1.0

–

–

–

–

–

–

–

1.0

–

248

45.0

2.1

1.4

15.0

4.433619

–

–

–

–

–

–

–

–

1.7

1.2

1.7

1.2

–

5.0

1.4

100

30.0

–

20.0

–

10.0

–

–

10.0

–

–

2.14

1.44

–

12.18

16.24

11.52

–

15.36

–

–

–

3.0

2.0

3.0

2.0

–

Unit

V

mA

%V

DD

%V

DD

%V

DD

%V

DD

MΩ

kΩ

MΩ

MΩ

kΩ

mVrms

dB

V

V

mV

MHz

kHz

kHz

kHz

kHz

kHz

kHz

cycles

ms

ms

ms

ms

ms

ns

Notes

1. Device sensitivity at the Detector Input pin, or using the 'Gain Set' Amplifier at unity.

2. These values are quoted at 3.5 volt V , any supply variation will alter levels accordingly.

DD

3. Tone Follower mode.

4. SPM Packet mode, in this mode the minimum valid Pulse (Space) length is programmable by means

of an RC network on the Pulse (Space) Length Time pin. If no RC network is used, the minimum

valid tone length reverts to 16 cycles.

5. The time for the circuit to recognize a valid 'Tone' in the Tone Follower mode.

6. The time for the circuit to recognize a valid 'No Tone' in the Tone Follower mode.

7. The FX621 is a low-power zero crossing detector without on-chip filtering, for use with a good

Signal-to-Noise ratio. The FX611 is recommended for high noise environments. If the supply current

requirement of the FX611 is unacceptable, separate external filters should be employed with the FX621.

5

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