CMLMICRO MX629

DATA BULLETIN
DELTA MODULATION CODEC
meets Mil-Std-188-113
MX629
Features
Applications
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Military Communications
Multiplexers, Switches, & Phones
➤
Meets Mil-Std-188-113
Single Chip Full Duplex CVSD CODEC
On-chip Input and Output Filters
Programmable Sampling Clocks
3- or 4-bit Companding Algorithm
Powersave Capabilities
Low Power, 5.0V Operation
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The MX629 is a Continuously Variable Slope Delta Modulation (CVSD) Codec designed for use in military
communications systems. This device is suitable for applications in military delta multiplexers, switches, and
phones. The MX629 is designed to meet Mil-Std-188-113 specifications.
Encoder input and decoder output filters are incorporated on-chip. Sampling clock rates can be programmed
to 16, 32, or 64kbps from an internal clock generator or externally injected in the 8 to 64kbps range. The
sampling clock frequency is output for the synchronization of external circuits.
The encoder has an enable function for use in multiplexer applications. Encoder and Decoder forced idle
capabilities are provided forcing 10101010…pattern in encode and a VDD/2 bias in decode. The companding
circuit may be operated with an externally selectable 3- or 4-bit algorithm. The device may be placed in
standby mode by selecting Powersave. A reference 1.024MHz oscillator uses an external clock or crystal.
The MX629 operates with a supply voltage of 5.0V and is available in the following packages: 24-pin PLCC
(MX629LH), 22-pin CERDIP (MX629J), and 22-pin PDIP (MX629P).
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
All Trademarks and service marks are held by their respective companies.
Delta Modulation CODEC
2
MX629
CONTENTS
Section
Page
1 Block Diagram................................................................................................................ 3
2 Signal List....................................................................................................................... 4
3 External Components.................................................................................................... 6
4 General Description....................................................................................................... 6
5 Application ..................................................................................................................... 7
5.1
5.2
CODEC Integration.............................................................................................................. 7
Digital to Analog Performance............................................................................................. 7
6 Performance Specification.......................................................................................... 11
6.1
6.2
Electrical Performance ...................................................................................................... 11
6.1.1
Absolute Maximum Ratings.................................................................................................. 11
6.1.2
Operating Limits ................................................................................................................... 11
6.1.3
Operating Characteristics..................................................................................................... 12
6.1.4
TIMING................................................................................................................................. 13
Packaging.......................................................................................................................... 14
MX-COM, Inc. reserves the right to change specifications at any time and without notice.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
All Trademarks and service marks are held by their respective companies.
Delta Modulation CODEC
3
MX629
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1 Block Diagram
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Figure 1: Block Diagram
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
All Trademarks and service marks are held by their respective companies.
Delta Modulation CODEC
4
MX629
2 Signal List
J/P
1
LH
1
Name
Xtal/Clock
Signal
input
N/C
2
2
3
3
4
4
5
N/C
Encoder Data
Clock
input/
output
5
6
Encoder Output
output
6
7
Encoder Force Idle
7
8
Data Enable
8
9
9
10
N/C
VBIAS
10
11
Encoder Input
input
11
12
13
12
13
14
VSS
N/C
Decoder Output
power
14
15
15
16
N/C
N/C
16
17
18
17
19
Decoder Input
18
20
Decoder Data
Clock
19
21
Algorithm
output
Xtal
input
output
Powersave
Decoder Force Idle
1998 MX-COM, Inc.
input/
output
Description
Input to the clock oscillator inverter. A 1.024MHz Xtal input or
externally derived clock is injected here. See Clock Mode pins and
Figure 2.
No Connection
The 1.024 MHz output of the clock oscillator inverter.
No Connection
A logic I/O port. External encode clock input or internal data clock
output. Clock frequency is dependent upon Clock Mode 1, 2 inputs
and Xtal frequency (see Clock Mode pins).
The encoder digital output. This is a three-state output whose
condition is set by the Data Enable and Powersave inputs. See
Table 2.
When this pin is at a logical “0” the encoder is forced to an idle
state and the encoder digital output is 0101, a perfect idle pattern.
When this pin is a logical “1” the encoder encodes as normal.
Internal 1M pullup.
Data is made available at the encoder output pin by control of this
input. See Encoder Output pin. Internal 1 M pullup.
No Connection
Normally at VDD/2 bias, this pin should be externally decoupled by
capacitor C4. Internally pulled to VSS when “ Powersave ” is a
logical “0”.
The analog signal input. Internally biased at VDD/2, this input
requires an external coupling capacitor. The source impedance
should be less than 100. Output channel noise levels will
improve with an even lower source impedance. See Figure 2.
Negative Supply
No Connection
The recovered analog signal is output at this pin. It is the buffered
output of a lowpass filter and requires external components.
During “Powersave” this output is open circuit.
No Connection
A logic “0” at this pin puts most parts of the codec into a quiescent
non-operational state. When at a logical “1”, the codec operates
normally. Internal 1 M pullup.
No Connection
A logic “0” at this pin gates a 0101... pattern internally to the
decoder so that the Decoder Output goes to VDD/2. When this pin
is a logical “1” the decoder operates as normal. Internal 1M
pullup.
The received digital signal input. Internal 1 M pullup.
A logic I/O port. External decode clock input or internal data clock
output, dependent upon clock mode 1,2 inputs. See Clock Mode
pins.
A logic “1” at this pin sets this device for a 3-bit companding
algorithm. A logical “0” sets a 4-bit companding algorithm. Internal
1 M pullup.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
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Delta Modulation CODEC
5
J/P
20
21
LH
22
23
Name
Clock Mode 2
Clock Mode 1
Signal
22
24
VDD
power
MX629
Description
Clock rates refer to f = 1024MHz Xtal/Clock input. During internal
operation the data clock frequencies are available at the ports for
external circuit synchronization. Independent or common data
rate inputs to Encode and Decode data clock ports may be
employed in the External Clocks mode. Internal 1M pullups.
See Table 3.
Positive Supply. A single 5.0V supply is required.
Table 1: Signal List
Data Enable
Powersave
Encoder Output
1
1
Enable
0
1
High Z (open circuit)
1
0
VSS
Table 2: Encoder Output
Clock Mode 1
Clock Mode 2
Facility
0
0
External Clocks
0
1
Internal, 64kbps = f/16
1
0
Internal, 32kbps = f/32
1
1
Internal, 16kbps = f/64
Table 3: Clock Mode
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
All Trademarks and service marks are held by their respective companies.
Delta Modulation CODEC
6
MX629
3 External Components
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Figure 2: Recommended External Components for Typical Application
10%
Note 2
1M
Selectable
C1
Note 3
33pF
C2
Note 3
68pF
R1
Note 1
R2
C3
Note 4
1.0F
20%
C4
Note 5
1.0F
20%
20%
C5
Note 6
20%
20%
X1
Note 7, 8
1.0F
1.024MHz
Table 4: Recommended External Components for Typical Application
Notes:
1. Oscillator inverter bias resister.
2. Xtal Drive limiting resistor.
3. Xtal circuit load capacitor.
4. Encoder input coupling capacitor. The drive source impedance to this input should be less than 100.
Output idle channel noise levels will improve with even lower source impedance.
5. Bias decoupling capacitor
6. VDD decoupling capacitor
7. A 1.024MHz Xtal/Clock input will yield exactly 16/32/64kbps data clock rates. Xtal circuitry shown is in
accordance with MX-COM’s Xtal Oscillator Application Note.
8. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at
least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain
crystal oscillator design assistance, please consult you crystal manufacturer.
4 General Description
The MX629 is a Continuously Variable Slope Delta Modulation (CVSD) Codec designed for use in military
communications systems. This device is suitable for applications in military delta multiplexers, switches and
phones. The MX629 is designed to meet Mil-Std-188-113 specifications.
Encoder input and decoder output filters are incorporated on-chip. Sampling clock rates can be programmed
to 16, 32, or 64kbps from an internal clock generator or externally injected in the 8 to 64kbps range. The
sampling clock frequency is output for the synchronization of external circuits.
The encoder has an enable function for use in multiplexer applications. Encoder and Decoder forced idle
capabilities are provided forcing 10101010…pattern in encode and a VDD/2 bias in decode. The companding
circuit may be operated with an externally selectable 3- or 4-bit algorithm. The device may be placed in
standby mode by selecting Powersave. A reference 1.024MHz oscillator uses an external clock or crystal.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
All Trademarks and service marks are held by their respective companies.
Delta Modulation CODEC
7
MX629
5 Application
Due to the very low levels of a signal idle channel noise specified for military applications, a noisy or badly
regulated power supply could cause instability, putting the overall system performance out of specification.
Adherence to the points listed below will assist in minimizing this problem.
1. Care should be taken in the design and layout of the printed circuit board.
2. All external components (as recommended in Figure 2) should be kept close to the package.
3. Tracks should be kept short, particularly the Encoder Input capacitor and the VBIAS capacitor.
4. Xtal/Clock tracks should be kept well away from analog inputs and outputs.
5. Inputs and outputs should be screened whenever possible.
6. A ‘ground plane’ connected to VSS will assist in eliminating external pick-up on the input and output pins.
7. It is recommended that the power supply rails have less that 1mVRMS of noise allowed.
8. The source impedance to the Encoder Input pin must be less that 100W; output idle channel, noise levels
will improve with even power source impedances.
CODEC Integration
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5.1
Figure 3: System Configuration using the MX629
5.2
Digital to Analog Performance
Sample Rate
‘Run of Threes’ (%)
Output level (dBm0)
16kbps
11011011010010010010
Bit Sequence at Decoder Input
0
-29.22
32kbps
1101101101010100100100100100101010110110
0
-30.02
16kbps
1111101101000010010
30
01
32kbps
1111110110101010000100000010010101011110
30
01
Table 5: Bit Sequence Test and Results
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
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Delta Modulation CODEC
8
MX629
Figure 4: Gain vs. Input Level (16kbps)
Figure 5: Gain vs. Input Level (32kbps)
Figure 6: S/N vs. Input Level (16kbps)
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
All Trademarks and service marks are held by their respective companies.
Delta Modulation CODEC
9
MX629
Figure 7: S/N vs. Input Level (32kbps)
Figure 8: Attenuation distrotion vs. Frequency (16kbps)
Figure 9: S/N vs. Input Frequency (16kbps)
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
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Delta Modulation CODEC
10
MX629
Figure 10: S/N vs. Input Frequency (32kbps)
Figure 11: Principal Integrator Response
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Figure 12: Compand Envelope
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
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Delta Modulation CODEC
11
MX629
Figure 13: Attenuation Distortion vs. Frequency (32kbps)
6 Performance Specification
6.1
6.1.1
Electrical Performance
Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device.
Supply (VDD - VSS)
Voltage on any pin to VSS
Current
VDD
VSS
any other pin
J / P / LH Packages
Total Allowable Power Dissipation at TAMB = 25°C
Derating above 25°C
Storage Temperature
Operating Temperature
6.1.2
Min.
-0.3
-0.3
Max.
7.0
VDD + 0.3
Units
V
V
-30
-30
-20
30
30
20
mA
mA
mA
-55
-40
800
10
125
85
mW
mW/°C above 25°C
°C
°C
Operating Limits
Correct operation of the device outside these limits is not implied.
Supply (VDD - VSS)
Operating Temperature
Xtal Frequency
1998 MX-COM, Inc.
Min
4.5
-40
500
Typ.
5.0
1.024
Max.
5.5
85
1500
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
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Units
V
°C
MHz
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Delta Modulation CODEC
6.1.3
12
MX629
Operating Characteristics
For the following conditions unless otherwise specified:
VDD = 5.0V at TAMB = 25°C, Audio Test Frequency = 820Hz Xtal/Clock f0 = 1.024MHz
3-bit Compand Algorithm, Sample Clock Rate = 32kbps, Audio level 0dB ref (0 dBm0) = 489mVRMS.
Static Values
Supply Voltage
Supply Current (Enabled)
Supply Current (Powersave)
Input logic ‘1’
Input Logic ‘0’
Output Logic ‘1’
Output Logic ‘0’
Digital input Impedance
Logic I/O pins
Logic Input pins, Pullup Resistor
Notes
Min.
Typ.
Max.
Units
1
4.5
5.0
5.5
400
5.5
V
mA
8
8
3.5
1.5
4.0
1.0
1.0
2
10
k
4
Analog Input Impedance
4
Analog Output Impedance
7
k
1
k
800
-4
4
3
1,9
-2
2
A
dB
5, 9
-35
127
12
212
Three State Output Leakage
1998 MX-COM, Inc.
M
300
Digital output impedance
Insertion Loss
Dynamic Values
Encoder
Analog signal Input levels
Principal Integrator Frequency
Encoder Passband
Compand Time Constant
Decoder
Analog Signal Output Levels
Decoder Passband
Encoder Decoder (Full Codec)
Compression Ration
(Cd = 0.3 to Cd = 0.0)
Passband
Stopband
Stopband Attenuation
4200Hz to 6000Hz
>6000Hz
Passband Gain
Passband Ripple
300Hz – 1400Hz
1400Hz – 2600Hz
2600Hz –3400Hz
Output Noise (Input Short Circuit)
Perfect Idle Channel Noise
(Encode Forced)
A
V
V
V
V
4.0
5, 9
159
3400
5.0
-35
300
6.0
dBmO
Hz
Hz
ms
12
3400
dBmO
Hz
3400
Hz
KHz
16:1
300
4.2
25
9
-55
dB
dB
dB
dB
dB
dB
dB
dBmO
9
-57
dBmO
60
0
-3
-1
-1
-2
3
1
1
3
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Delta Modulation CODEC
13
Group Delay Distrotion
(1000Hz-2600Hz)
Notes
4
6
(600Hz-2800Hz)
6
(500Hz-3000Hz)
Xtal/clock Frequency
6
MX629
Min.
Typ.
Max.
Units
450
s
750
s
ms
kHz
1.5
1024
Notes:
1. Dynamic characteristics are specified at 5.0V unless otherwise specified.
2. All logic inputs except Encoder and Decoder Data clocks
3. For and encoder/Decoder combination, Insertion loss contributed by a single component is half this figure.
4. Driven with a source impedance of <100.
5. Recommended values – See Figures 4, 5, 6, and 7.
6. Group Delay Distortion for the full codec is relative to the delay with and 820Hz, -20dB signal at the
encoder input
7. An Emitter Follower output stage.
8. 4V = 80%VDD, 3.5V = 70%VDD, 1.5V = 30%VDD, 1V = 20%VDD
9. Analog Voltage Levels used: 0dBmO = 489mVRMS = -4dBm = 0dB. –15dBmO = 87mVRMS. –20dBmO =
49mVRMS = -24dBm.
6.1.4
TIMING
Serial Bus Timings (See Figure 14)
tCH
Clock 1 pulse width
tCL
Clock 0 pulse width
tIR
tIF
tSU
tH
tSU +tH
Clock rise time
Clock fall time
Data set-up time
Data hold time
Data true time
tPCO
Clock to output delay time
tDR
Data rise time
tDF
Data fall time
Xtal input frequency = 1.024MHz
1998 MX-COM, Inc.
Min.
1.0
Typ.
Max.
s
1.0
0
100
100
450
600
1.5
750
100
100
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Units
s
ns
ns
ns
ns
s
ns
ns
ns
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Delta Modulation CODEC
14
MX629
ENCODER TIMING
ENCODER
CLOCK
tCH
tCH
tCL
t IR
tIF
DATA CLOCKED
ENCODER DATA
OUTPUT
tPCO
DECODER TIMING
DECODER
CLOCK
DATA CLOCKED
DECODER DATA
INPUT
tSU
tH
DATA TRUE TIME
MULTIPLEXING FUNCTION
ENCODER
OUTPUT
HIGH Z
HIGH Z
t DF
tDR
DATA ENABLE
Figure 14: CODEC Timing
6.2
Packaging
E
B
C
Package Tolerances
K
Y
DA
W
J
W
T
PIN 1
P
G
H
DIM.
A
B
C
D
E
F
G
H
J
K
P
T
W
Y
MIN.
TYP.
MAX.
0.409 (10.40)
0.380 (9.61)
0.409 (10.40)
0.380 (9.61)
0.146 (3.70)
0.128 (3.25)
0.435 (11.05)
0.417 (10.60)
0.435 (11.05)
0.417 (10.60)
0.250 (6.35)
0.250 (6.35)
0.023 (0.58)
0.018 (0.45)
0.022 (0.55)
0.047 (1.19)
0.048 (1.22)
0.051 (1.30)
0.049 (1.24)
0.009 (0.22)
0.006 (0.152)
30°
45°
6°
NOTE : All dimensions in inches (mm.)
Angles are in degrees
F
Figure 15: 24-pin PLCC (LH) Mechanical Outline: Order as part no. MX629LH
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
All Trademarks and service marks are held by their respective companies.
Delta Modulation CODEC
15
MX629
Package Tolerances
A
B
E1
DIM.
A
B
C
E
E1
H
J
J1
K
L
P
T
Y
E
Y
T
PIN 1
K
C
H
L
J
J1
MIN.
TYP.
MAX.
1.100 (27.94)
0.360 (9.14)
1.080 (27.43)
0.330 (8.38)
0.185 (4.70)
0.420 (10.67)
0.480 (12.19)
0.390 (9.91)
0.420 (10.67)
0.020 (0.51)
0.045 (1.14)
0.015 (0.38)
0.020 (0.51)
0.040 (1.02)
0.065 (1.65)
0.066 (1.68)
0.128 (3.25)
0.100 (2.54)
0.010 (0.25)
7°
NOTE : All dimensions in inches (mm.)
Angles are in degrees
P
Figure 16: 22-pin PDIP (P) Mechanical Outline: Order as part no. MX629P
Package Tolerances
A
B
E1
E
T
PIN1
K
K1 C
H
L
J
J1
P
F
DIM.
A
B
C
E
E1
F
H
J
J1
K
K1
L
P
T
MIN.
TYP.
MAX.
1.080 (27.43)
1.060 (26.92)
0.384 (9.75)
0.376 (9.55)
0.165 (4.19)
0.230 (5.84)
0.466 (11.84)
0.515 (13.08)
0.408 (10.36)
0.418 (10.62)
1.000 (25.40)
0.020 (0.51)
0.018 (0.46)
0.055 (1.40)
0.058 (1.47)
0.080 (2.03)
0.075 (1.91)
0.080 (2.03)
0.115 (2.92)
0.171 (4.34)
0.100 (2.54)
0.0098 (0.249)
0.0102 (0.259)
NOTE : All dimensions in inches (mm.)
Angles are in degrees
Figure 17: 22-pin CERDIP (J) Mechanical Outline: Order as part no. MX629J
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480190.001
All Trademarks and service marks are held by their respective companies.
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CML Product Data
In the process of creating a more global image, the three standard product semiconductor
companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc
(USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst
maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA)
Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML
Microcircuits.
These companies are all 100% owned operating companies of the CML Microsystems Plc
Group and these changes are purely changes of name and do not change any underlying legal
entities and hence will have no effect on any agreements or contacts currently in force.
CML Microcircuits Product Prefix Codes
Until the latter part of 1996, the differentiator between products manufactured and sold from
MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX
respectively. These products use the same silicon etc. and today still carry the same prefixes.
In the latter part of 1996, both companies adopted the common prefix: CMX.
This notification is relevant product information to which it is attached.
CML Microcircuits (USA) [formerly MX-COM, Inc.] Product Textual Marking
On CML Microcircuits (USA) products, the ‘MX-COM’ textual logo is being replaced by a ‘CML’
textual logo.
Company contact information is as below:
CML Microcircuits
(UK)Ltd
CML Microcircuits
(USA) Inc.
CML Microcircuits
(Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
COMMUNICATION SEMICONDUCTORS
COMMUNICATION SEMICONDUCTORS
Oval Park, Langford, Maldon,
Essex, CM9 6WG, England
Tel: +44 (0)1621 875500
Fax: +44 (0)1621 875600
[email protected]
www.cmlmicro.com
4800 Bethania Station Road,
Winston-Salem, NC 27105, USA
Tel: +1 336 744 5050,
0800 638 5577
Fax: +1 336 744 5054
[email protected]
www.cmlmicro.com
No 2 Kallang Pudding Road, 09-05/
06 Mactech Industrial Building,
Singapore 349307
Tel: +65 7450426
Fax: +65 7452917
[email protected]
www.cmlmicro.com
D/CML (D)/2 May 2002