Specification ......
Characteristics
See Note
Min.
Typ.
Max.
Unit
Output Distortion
Output Signal-to-Noise Ratio
Total Harmonic Distortion Level
3, 12
4, 11
48.0
–
52.0
-40.0
–
dBp
dB
-30.0
Compressor
Dynamic Range
Attack Time
–
–
–
30.0
7.0
1000
–
–
–
dB
ms
ms
Decay Time
Deviation Limiter
Input Thresholds
4
6
–
2.0
–
V p–p
Frequency Responses
Pre-Process Path
Passband Frequencies
-3dB (Lower)
-3dB (Upper)
Passband Ripple
–
–
240
4.7
–
–
4.2
–
–
–
1.0
1.0
–
–
–
–
Hz
kHz
dB
dB
dB
dB/oct.
dB
dB/oct.
(300Hz - 400Hz)
(400Hz - 3400Hz)
(ƒ = 5kHz)
(ƒ = >5kHz, <20kHz)
(ƒ = 250Hz)
(ƒ = <250Hz)
5
5
-3.0
-1.5
3.0
12.0
–
Stopband Attenuation
High Frequency Roll-off
Stopband Attenuation
Low Frequency Roll-off
2.3
–
6.0
Post-Process Path
7
Wideband : Lowpass Frequency (-3dB)
–
3.4
–
–
17.0
–
–
1.0
1.0
–
kHz
dB
dB
dB
dB/oct.
Passband Ripple
(< 2700Hz)
8
8
-1.5
-3.0
12.2
18.0
(2700Hz - 3000Hz)
(ƒ = 5kHz)
(ƒ = >3kHz, <20kHz)
Stopband Attenuation
High Frequency Roll-off
–
Narrowband: Lowpass Frequency (-3dB)
–
2.9
–
–
17.0
–
–
1.0
1.0
–
kHz
dB
dB
dB
dB/oct.
Passband Ripple
(< 2300Hz)
-1.5
-3.0
12.2
18.0
(2300Hz - 2550Hz)
(ƒ = 4.25kHz)
(ƒ = >2.3kHz, <5.1kHz)
Stopband Attenuation
High Frequency Roll-off
–
Pre-emphasis: Passband Frequencies
Gain at 1kHz
Slope Characteristic
De-emphasis: Passband Frequencies
Gain at 1kHz
300
–
–
300
–
3000
–
–
3000
–
Hz
dB
dB/oct.
Hz
0
6.0
0
dB
Slope Characteristic
–
6.0
–
dB/oct.
Squelch Bandpass Filter
Centre Frequency Gain
Selectable Gain
Narrow Band:
(Wide and Narrow)
(8 x 1.0dB steps)
–
-3.0
35.0
–
–
4.0
dB
dB
9
Centre Frequency
Bandwidth
(ƒc)
(ƒc ±)
–
–
18.75
6.5
–
–
kHz
kHz
Wideband:
Centre Frequency
Bandwidth
(ƒc)
(ƒc ±)
–
–
25.5
8.5
–
–
kHz
kHz
Notes
1.
2.
3.
A percentage of the applied VDD (70% or 30%).
These inputs are compared internally with the Digital-to-Analogue converter.
With a minimum signal input level of 50mVrms at the Tx I/P or 65mVrms at the Rx I/P and an output level of
466mVrms.
4.
5.
6.
7.
Levels at the input of the Limiter element, centred about VBIAS (Note 2).
This parameter remains within specification when pre-emphasis is employed.
With both Input HPF and LPF in circuit, but without pre-emphasis.
With Limiter LPF, but without de-emphasis characteristics.
8.
9.
This parameter remains within specification when de-emphasis is employed.
The gain variation around the centre frequency (ƒc).
10.
11.
See Application Information pages (Suggested Evaluation Tests) for information on gain element settings.
Mode: Tx with Compressor “OFF;” or in Rx, signal below limiter thresholds; Output level 466mVrms.
Measured in a 30kHz bandwidth.
12.
In the Tx mode with the Input Gain Amp set to ≤ 4.0dB.
15
CMLMICRO [ CML MICROCIRCUITS ]
