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PDF ( 数据手册 , 数据表 ) ML145557

零件编号 ML145557
描述 (ML145554 - ML145567) PCM Codec-Filter
制造商 LANSDALE Semiconductor
LOGO LANSDALE Semiconductor LOGO 


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ML145557 数据手册, 描述, 功能
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ML145554 ML145564
ML145557 ML145567
PCM Codec–Filter
Legacy Device: Motorola MC145554, MC145557, MC145564, MC145567
The ML145554, ML145557, ML145564, and ML145567 are all per channel
PCM Codec–Filters. These devices perform the voice digitization and recon-
struction as well as the band limiting and smoothing required for PCM sys-
tems. They are designed to operate in both synchronous and asynchronous
applications and contain an on–chip precision voltage reference. The
ML145554 (Mu–Law) and ML145557 (A–Law) are general purpose devices
that are offered in 16–pin packages. The ML145564 (Mu–Law) and
ML145567 (A–Law), offered in 20–pin packages, add the capability of analog
loopback and push–pull power amplifiers with adjustable gain.
These devices have an input operational amplifier whose output is the input
to the encoder section. The encoder section immediately low–pass filters the
analog signal with an active R–C filter to eliminate very–high–frequency noise
from being modulated down to the pass band by the switched capacitor filter.
From the active R–C filter, the analog signal is converted to a differential sig-
nal. From this point, all analog signal processing is done differentially. This
allows processing of an analog signal that is twice the amplitude allowed by a
single–ended design, which reduces the significance of noise to both the invert-
ed and non–inverted signal paths. Another advantage of this differential design
is that noise injected via the power supplies is a common–mode signal that is
cancelled when the inverted and non–inverted signals are recombined. This
dramatically improves the power supply rejection ratio.
After the differential converter, a differential switched capacitor filter band-
passes the analog signal from 200 Hz to 3400 Hz before the signal is digitized-
by the differential compressing A/D converter.
The decoder accepts PCM data and expands it using a differential D/A con-
verter. The output of the D/A is low–pass filtered at 3400 Hz and sinX/X com-
pensated by a differential switched capacitor filter. The signal is then filtered
by an active R–C filter to eliminate the out–of–band energy of the switched
capacitor filter.
These PCM Codec–Filters accept both long–frame and short–frame industry
standard clock formats. They also maintain compatibility with Motorola’s fami-
ly of TSACs and MC3419/MC34120 SLIC products.
The ML145554/57/64/67 family of PCM Codec–Filters utilizes CMOS due
to its reliable low–power performance and proven capability for complex
analog/digital VLSI functions.
FEATURES
16
1
16
1
P DIP 16 = EP
PLASTIC DIP
CASE 648
ML145554/57
SOG 16 = -5P
SOG PACKAGE
CASE 751G
ML145554/57
20
1
20
1
P DIP 20 = RP
PLASTIC DIP
CASE 738
ML145564/67
SOG 20 = -6P
SOG PACKAGE
CASE 751D
ML145564/67
CROSS REFERENCE/ORDERING INFORMATION
PACKAGE
MOTOROLA
LANSDALE
P DIP 16
SO 16W
P DIP 16
SO 16W
P DIP 20
SO 20W
P DIP 20
SO 20W
MC145554P
MC145554DW
MC145557P
MC145557DW
MC145564P
MC145564DW
MC145567P
MC145567DW
ML145554EP
ML145554-5P
ML145557EP
ML145557-5P
ML145564RP
ML145564-6P
ML145567RP
ML145567-6P
Note: Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from ML to MLE.
ML145554/57(16–Pin Package)
• Fully Differential Analog Circuit Design for Lowest Noise
• Performance Specified for Extended Temperature Range of – 40 to + 85°C
• Transmit Band–Pass and Receive Low–Pass Filters On–Chip
• Active R–C Pre–Filtering and Post–Filtering
• Mu–Law Companding ML145554
• A–Law Companding ML145557
• On–Chip Precision Voltage Reference (2.5 V)
• Typical Power Dissipation of 40 mW, Power Down of 1.0 mW at ±5 V
ML145564/67(20–Pin Package) — All of the Features of the ML145554/57 Plus:
• Mu–Law Companding ML145564
• A–Law Companding ML145567
• Push–Pull Power Drivers with External Gain Adjust
• Analog Loopback
Page 1 of 18
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Issue A







ML145557 pdf, 数据表
ML145554, ML145557, ML145564, ML145567
www.DataSheet4U.com
LANSDALE Semiconductor, Inc.
ANALOG TRANSMISSION PERFORMANCE
(VCC = + 5 V 5%, VBB = – 5 V ± 5%, GNDA = 0 V, 0 dBm0 = 1.2276 Vrms = + 4 dBm @ 600 , FSX = FSR = 8 kHz,
BCLKX = MCLKX = 2.048 MHz Synchronous Operation, VFXI – Connected to GSX, TA = – 40 to + 85°C Unless Otherwise Noted)
End–to–End
A/D
D/A
Characteristic
Min Max Min Max Min Max Unit
Absolute Gain (0 dBm0 @ 1.02 kHz, TA = 25°C, VCC = 5 V, VBB = – 5 V)
Absolute Gain Variation with Temperature
0 to 70°C
– 40 to + 85°C
— – 0.25 – 0.25 – 0.25 + 0.25 dB
— — ± 0.03 — ± 0.03 dB
— — ± 0.06 — ± 0.06
Absolute Gain Variation with Power Supply (VCC = 5 V, ± 5%,
VBB = – 5 V, 5%)
Gain vs Level Tone (Relative to – 10 dBm0, 1.02 kHz) + 3 to – 40 dBm0
– 40 to – 50 dBm0
– 50 to – 55 dBm0
– 0.4
– 0.8
– 1.6
+ 0.4
+ 0.8
+ 1.6
± 0.02 — ± 0.02
– 0.2
– 0.4
– 0.8
+ 0.2
+ 0.4
+ 0.8
– 0.2
– 0.4
– 0.8
+ 0.2
+ 0.4
+ 0.8
dB
dB
Gain vs Level Pseudo Noise CCITT G.712
(ML145557/67 A–Law Relative to – 10 dBm0)
– 10 to – 40 dBm0
– 40 to – 50 dBm0
– 50 to – 55 dBm0
— – 0.25 + 0.25 – 0.25 + 0.25 dB
— – 0.30 + 0.30 – 0.30 + 0.30
— – 0.45 + 0.45 – 0.45 + 0.45
Total Distortion, 1.02 kHz Tone (C–Message)
+ 3 dBm0 33 — 33 — 33 — dBC
0 to – 30 dBm0 35 — 36 — 36 —
– 40 dBm0 29 — 30 — 30 —
– 45 dBm0 24 — 25 — 25 —
– 55 dBm0 15 — 15 — 15 —
Total Distortion With Pseudo Noise CCITT G.714
(ML145557/67 A–Law)
– 3 dBm0 27.5 — 28 — 28.5 —
– 6 to – 27 dBm0 35 — 35.5 — 36 —
– 34 dBm0 33.1 — 33.5 — 34.2 —
– 40 dBm0 28.2 — 28.5 — 30 —
– 55 dBm0 13.2 — 13.5 — 15 —
dB
Idle Channel Noise (For End–End and A/D, Note 1)
(ML145554/64 Mu–Law, C–Message Weighted)
(ML145557/67 A–Law, Psophometric Weighted)
— 15 — 15 —
7 dBrnC0
— – 70 — – 70 — – 83 dBm0p
Frequency Response (Relative to 1.02 kHz @ 0 dBm0)
15 Hz
50 Hz
60 Hz
200 Hz
300 to 3000 Hz
3300 Hz
3400 Hz
4000 Hz
4600 Hz
– 0.3
– 0.70
– 1.6
– 40
– 30
– 26
0.3
+ 0.3
0
– 28
– 60
– 1.0
– 0.15
– 0.35
– 0.8
– 40
– 30
– 26
– 0.4
+ 0.15
+ 0.15
0
– 14
– 32
– 0.15
– 0.15
– 0.15
– 0.15
– 0.15
– 0.35
– 0.8
0
0
0
0
+ 0.15
+ 0.15
0
– 14
– 30
dB
In–Band Spurious
(1.02 kHz @ 0 dBm0, Transmit and Receive)
300 to 3000 Hz — – 48 — – 48 — – 48 dBm0
Out–of–Band Spurious at VFRO (300 – 3400 Hz @ 0 dBm0 In)
dB
4600 to 7600 Hz — – 30 — — — – 30
7600 to 8400 Hz — – 40 — — — – 40
8400 to 100,000 Hz — – 30 — — — – 30
Idle Channel Noise Selective (8 kHz, Input = GNDA, 30 Hz Bandwidth)
— – 70 — — — – 70 dBm0
Absolute Delay (1600 Hz)
— — — 315 — 215 µs
Group Delay Referenced to 1600 Hz
500 to 600 Hz — — — 220 – 40 —
µs
600 to 800 Hz — — — 145 – 40 —
800 to 1000 Hz — — — 75 – 40 —
1000 to 1600 Hz — — — 40 – 30 —
1600 to 2600 Hz — — — 75 — 90
2600 to 2800 Hz — — — 105 — 125
2800 to 3000 Hz — — — 155 — 175
Crosstalk of 1020 Hz @ 0 dBm0 from A/D or D/A (Note 2)
— — — – 75 — – 75 dB
Intermodulation Distortion of Two Frequencies of Amplitudes
– 4 to – 21 dBm0 from the Range 300 to 3400 Hz
— – 41 — – 41 — – 41 dB
NOTES:
1. Extrapolated from a 1020 Hz @ – 50 dBm0 distortion measurement to correct for encoder enhancement.
2. Selectively measured while the A/D is stimulated with 2667 Hz @ – 50 dBm0.
Page 8 of 18
www.lansdale.com
Issue A







ML145557 equivalent, schematic
ML145554, ML145557, ML145564, ML145567
www.DataSheet4U.com
LANSDALE Semiconductor, Inc.
Chord Number Step
Number of Steps Size
7 16 128
Table 4. A–Law Encode–Decode Characteristics
Normalized
Encode
Decision
Levels
1
Sign
2
Chord
3
Chord
Digital Code
45
Chord Step
67
Step Step
4096
3968
1 0 1 0 1 01
8
Step
Normalized
Decode
Levels
0 4032
2176
2048
1 0 1 0 0 1 0 1 2112
6
16 64
1088
1 0 1 1 0 1 0 1 1056
1024
5 16 32 544
512
1 0 0 0 0 10 1
528
4 16 16 272
256
1 0 0 1 0 10 1
264
3 16 8 136
1 1 1 0 0 10 1
132
128
2 16 4
68
1 1 1 1 0 10 1
66
64
1 32 2
2
1 1 0 1 01
0
NOTES:
1. Characteristics are symmetrical about analog zero with sign bit = 0 for negative analog values.
2. Digital code includes alternate bit inversion, as specified by CCITT.
0
1
1
Page 16 of 18
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Issue A










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