DATA BULLETIN
MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
DELTA MODULATION CODEC
meets Mil-Std-188-113
Features Applications
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
Military Communications
Multiplexers, Switches, & Phones
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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).
Delta Modulation CODEC 2 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
CONTENTS
Section Page
1 Block Diagram................................................................................................................3
2 Signal List.......................................................................................................................4
3 External Components....................................................................................................6
4 General Description.......................................................................................................6
5 Application .....................................................................................................................7
5.1 CODEC Integration.............................................................................................................. 7
5.2 Digital to Analog Performance............................................................................................. 7
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
6.1.4 TIMING.................................................................................................................................13
6.2 Packaging.......................................................................................................................... 14
MX-COM, Inc. reserves the right to change specifications at any time and without notice.
Delta Modulation CODEC 3 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
1 Block Diagram
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Figure 1: Block Diagram
Delta Modulation CODEC 4 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
2 Signal List
J/P LH Name Signal Description
1 1 Xtal/Clock input 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.
2 N/C No Connection
23
Xtal output The 1.024 MHz output of the clock oscillator inverter.
3 4 N/C No Connection
4 5 Encoder Data
Clock input/
output 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).
5 6 Encoder Output output The encoder digital output. This is a three-state output whose
condition is set by the Data Enable and Powersave inputs. See
Table 2.
67 Idle Force Encoder 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.
7 8 Data Enable input Data is made available at the encoder output pin by control of this
input. See Encoder Output pin. Internal 1 M pullup.
8 9 N/C No Connection
910V
BIAS Normally at VDD/2 bias, this pin should be externally decoupled by
capacitor C4. Internally pulled to VSS when “Powersave ” is a
logical “0”.
10 11 Encoder Input input 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.
11 12 VSS power Negative Supply
12 13 N/C No Connection
13 14 Decoder Output output 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.
14 15 N/C No Connection
15 16 Powersave 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.
17 N/C No Connection
16 18 Idle Force Decoder 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.
17 19 Decoder Input The received digital signal input. Internal 1 M pullup.
18 20 Decoder Data
Clock input/
output 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.
19 21 Algorithm 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.
Delta Modulation CODEC 5 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
J/P LH Name Signal Description
20 22 Clock Mode 2
21 23 Clock Mode 1 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.
22 24 VDD power 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)
10V
SS
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
Delta Modulation CODEC 6 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
3 External Components
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Figure 2: Recommended External Components for Typical Application
R1 Note 1 1M
10% C3 Note 4 1.0F20%
R2 Note 2 Selectable C4 Note 5 1.0F20%
C1 Note 3 33pF 20% C5 Note 6 1.0F20%
C2 Note 3 68pF 20% X1 Note 7, 8 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.
Delta Modulation CODEC 7 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
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.
5.1 CODEC Integration
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Figure 3: System Configuration using the MX629
5.2 Digital to Analog Performance
Sample Rate Bit Sequence at Decoder Input ‘Run of Threes’ (%) Output level (dBm0)
16kbps 11011011010010010010 0 -29.22
32kbps 1101101101010100100100100100101010110110 0 -30.02
16kbps 1111101101000010010 30 01
32kbps 1111110110101010000100000010010101011110 30 01
Table 5: Bit Sequence Test and Results
Delta Modulation CODEC 8 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
Figure 4: Gain vs. Input Level (16kbps)
Figure 5: Gain vs. Input Level (32kbps)
Figure 6: S/N vs. Input Level (16kbps)
Delta Modulation CODEC 9 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
Figure 7: S/N vs. Input Level (32kbps)
Figure 8: Attenuation distrotion vs. Frequency (16kbps)
Figure 9: S/N vs. Input Frequency (16kbps)
Delta Modulation CODEC 10 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
Figure 10: S/N vs. Input Frequency (32kbps)
Figure 11: Principal Integrator Response
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Figure 12: Compand Envelope
Delta Modulation CODEC 11 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
Figure 13: Attenuation Distortion vs. Frequency (32kbps)
6 Performance Specification
6.1 Electrical Performance
6.1.1 Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device.
Min. Max. Units
Supply (VDD - VSS) -0.3 7.0 V
Voltage on any pin to VSS -0.3 VDD + 0.3 V
Current
VDD -30 30 mA
VSS -30 30 mA
any other pin -20 20 mA
J / P / LH Packages
Total Allowable Power Dissipation at TAMB = 25°C - 800 mW
Derating above 25°C - 10 mW/°C above 25°C
Storage Temperature -55 125 °C
Operating Temperature -40 85 °C
6.1.2 Operating Limits
Correct operation of the device outside these limits is not implied.
Min Typ. Max. Units
Supply (VDD - VSS) 4.5 5.0 5.5 V
Operating Temperature -40 85 °C
Xtal Frequency 500 1.024 1500 MHz
Delta Modulation CODEC 12 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
6.1.3 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.
Notes Min. Typ. Max. Units
Static Values
Supply Voltage 1 4.5 5.0 5.5 V
Supply Current (Enabled) 5.5 mA
Supply Current (Powersave) 400 A
Input logic ‘1’ 8 3.5 V
Input Logic ‘0’ 8 1.5 V
Output Logic ‘1’ 4.0 V
Output Logic ‘0’ 1.0 V
Digital input Impedance
Logic I/O pins 1.0 10 M
Logic Input pins, Pullup Resistor 2 300 k
Digital output impedance 4 k
Analog Input Impedance 4 1 k
Analog Output Impedance 7 800
Three State Output Leakage -4 4 A
Insertion Loss 3 -2 2 dB
Dynamic Values 1,9
Encoder
Analog signal Input levels 5, 9 -35 12 dBmO
Principal Integrator Frequency 127 159 212 Hz
Encoder Passband 3400 Hz
Compand Time Constant 4.0 5.0 6.0 ms
Decoder
Analog Signal Output Levels 5, 9 -35 12 dBmO
Decoder Passband 300 3400 Hz
Encoder Decoder (Full Codec)
Compression Ration
(Cd = 0.3 to Cd = 0.0) 16:1
Passband 300 3400 Hz
Stopband 4.2 KHz
Stopband Attenuation
4200Hz to 6000Hz 25 dB
>6000Hz 60 dB
Passband Gain 0 dB
Passband Ripple -3 3 dB
300Hz – 1400Hz -1 1 dB
1400Hz – 2600Hz -1 1 dB
2600Hz –3400Hz -2 3 dB
Output Noise (Input Short Circuit) 9 -55 dBmO
Perfect Idle Channel Noise
(Encode Forced) 9 -57 dBmO
Delta Modulation CODEC 13 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
Notes Min. Typ. Max. Units
Group Delay Distrotion 4
(1000Hz-2600Hz) 6 450 s
(600Hz-2800Hz) 6 750 s
(500Hz-3000Hz) 6 1.5 ms
Xtal/clock Frequency 1024 kHz
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) Min. Typ. Max. Units
tCH Clock 1 pulse width 1.0 s
tCL Clock 0 pulse width 1.0 s
tIR Clock rise time 0 100 ns
tIF Clock fall time 100 ns
tSU Data set-up time 450 ns
tHData hold time 600 ns
tSU +tHData true time 1.5 s
tPCO Clock to output delay time 750 ns
tDR Data rise time 100 ns
tDF Data fall time 100 ns
Xtal input frequency = 1.024MHz
Delta Modulation CODEC 14 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
ENCODER TIMING
DECODER TIMING
MULTIPLEXING FUNCTION
ENCODER
CLOCK
ENCODER DATA
OUTPUT
DECODER
CLOCK
DECODER DATA
INPUT
ENCODER
OUTPUT
DATA ENABLE
HIGH Z HIGH Z
DATA TRUE TIME
DATA CLOCKED
DATA CLOCKED
CH
H
SU
DR DF
PCO
CH
CL
IF IR
t
t
t
tt
t
t
t
tt
Figure 14: CODEC Timing
6.2 Packaging
PackageTolerances
NOTE : All dimensions in inches (mm.)
Angles are in degrees
A
B
C
D
E
H
P
F
G
TYP. MAX.MIN.DIM.
K
J
W
T
Y
0.435 (11.05)
0.435 (11.05)
0.051 (1.30)
0.009 (0.22)
6°
30°
0.409 (10.40)
0.409 (10.40)
0.146 (3.70)
0.417 (10.60)
0.417 (10.60)
0.049 (1.24)
0.006 (0.152)
0.250 (6.35)
0.250 (6.35)
0.023 (0.58)
0.047 (1.19) 0.022 (0.55)0.018 (0.45)
0.380 (9.61)
0.380 (9.61)
0.128 (3.25)
0.048 (1.22)
45°
F
G
P
A
D
B
E
PIN 1
W
C
J
K
Y
WH
T
Figure 15: 24-pin PLCC (LH) Mechanical Outline:
Order as part no. MX629LH
Delta Modulation CODEC 15 MX629
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480190.001
4800 Bethania Station Road, W inston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
NOTE : All dimensions in inches (mm.)
Angles are in degrees
Package Tolerances
A
B
C
E
E1
H
TYP. MAX.MIN.DIM.
J
J1
K
L
0.360 (9.14)
0.480 (12.19)
0.128 (3.25)
1.100 (27.94)
0.185 (4.70)
0.420 (10.67)
0.390 (9.91) 0.420 (10.67)
0.020 (0.51) 0.020 (0.51)
0.040 (1.02)0.066 (1.68)
1.080 (27.43)
0.330 (8.38)
0.100 (2.54)
0.045 (1.14)
0.065 (1.65)
0.015 (0.38)
P
0.010 (0.25)
T
Y
7°
E
Y
E1
T
C
P
J1
K
H
J
L
B
A
PIN 1
Figure 16: 22-pin PDIP (P) Mechanical Outline:
Order as part no. MX629P
NOTE : All dimension s in inches (mm.)
Angles are in degrees
Package Tolerances
B
A
H
K
L
E
F
J1
JP
C
K1
E1
T
PIN1
A
B
C
E
E1
F
H
TYP. MAX.MIN.DIM.
J
J1
P
T
K1
K
L
0.230 (5.84)
0.384 (9.75)
0.515 (13.08)
0.171 (4.34)
1.080 (27.43)
0.165 (4.19)
0.100 (2.54)
0.115 (2.92)
0.466 (11.84)
0.408 (10.36) 0.418 (10.62)
1.000 (25.40)
0.020 (0.51)
0.018 (0.46)
0.058 (1.47)
0.075 (1.91) 0.080 (2.03)
0.080 (2.03)
1.060 (26.92)
0.376 (9.55)
0.0102 (0.259)
0.055 (1.40)
0.0098 (0.249)
Figure 17: 22-pin CERDIP (J) Mechanical Outline:
Order as part no. MX629J
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
COMMUNICATION SEMICONDUCTORS
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CML Microcircuits
(Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
CML Microcircuits
(USA) Inc.
COMMUNICATION SEMICONDUCTORS
Oval Park, Langford, Maldon,
Essex, CM9 6WG, England
Tel: +44 (0)1621 875500
Fax: +44 (0)1621 875600
uk.sales@cmlmicro.com
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
us.sales@cmlmicro.com
www.cmlmicro.com
No 2 Kallang Pudding Road, 09-05/
06 Mactech Industrial Building,
Singapore 349307
Tel: +65 7450426
Fax: +65 7452917
sg.sales@cmlmicro.com
www.cmlmicro.com
D/CML (D)/2 May 2002
