CMLMICRO MX029

DATA BULLETIN
MX029
Dual Digitally Controlled Amplifier
PRELIMINARY INFORMATION
Features
Applications
2 Digitally Controlled Amplifiers
±48dB Gain/Attenuation in 2dB Steps + Mute
Individual Control with a 14-Bit Serial Word
Separate Fixed Gain Buffer Amplifier
SERIAL CLOCK
DATA INPUT
LOAD/LATCH
Cellular and LMR Radios
PABX’s, Electronic Mail, TAM's
Automatic Test Equipment
Remote Gain Adjustments
Digitally Set Audio Control Levels
SERIAL
INTERFACE
VDD
STAGE 1 CONTROL REGISTER
VSS
BIAS
VSS
BIAS
CH1, INPUT 1
CH1, OUTPUT 1
∆G
CH1, INPUT 2
CH1, INPUT 3
CH1, OUTPUT 2
TO STAGE 1
CONTROL
REGISTER
VSS
BIAS
STAGE 1 CONTROL REGISTER
VSS
BIAS
CH2, INPUT 1
∆G
CH2, OUTPUT 1
CH2, INPUT 2
UNIVERSAL
AMP OUT
UNIVERSAL
AMP IN
BIAS
The MX029 Digitally Controlled Amplifier Array replaces audio level controls in radio and wireline
communications applications. It is a single-chip LSI circuit comprised of two discrete, digitally controlled gain
sections. Each section has 48 distinct gain steps (+/-48dB of range in 2dB steps) plus MUTE.
As shown in Figure 1, both gain stages have switchable inputs. This switching allows for selection of three
different input signals on one channel and two on the other channel. One of the channels also has output
switching. In addition to two digitally controlled gain stages, there is a general purpose inverting amplifier.
The gain of this amplifier is controlled externally via negative feedback. Control of each gain control section is
accomplished through the serial interface. All switching is accomplished using controlled rise and fall times,
thereby assuring no transients (clicks or pops).
The MX029 requires a single 5-volt supply and is available in the following packages: 16-pin SOIC
(MX029DW), 16-pin CDIP (MX029J), and 24-pin TSSOP (MX029TN).
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
2
MX029
CONTENTS
Section
Page
1. Block Diagram ................................................................................................................. 3
2. Signal List ........................................................................................................................ 4
3. External Components ..................................................................................................... 5
4. Application....................................................................................................................... 5
4.1 Recommendations ................................................................................................................. 5
5. Control Data and Timing................................................................................................. 6
6. Performance Specification ............................................................................................. 8
6.1 Electrical Performance ........................................................................................................... 8
6.1.1 Absolute Maximum Ratings .......................................................................................................... 8
6.1.2 Operating Limits............................................................................................................................ 8
6.1.3 Operating Characteristics ............................................................................................................. 9
6.2 Serial Interface Timing ......................................................................................................... 10
6.3 Packaging............................................................................................................................. 11
MX-COM, Inc. reserves the right to change specifications at any time and without notice.
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
3
MX029
1. Block Diagram
SERIAL CLOCK
DATA INPUT
LOAD/LATCH
SERIAL
INTERFACE
VDD
STAGE 1 CONTROL REGISTER
VSS
BIAS
VSS
BIAS
CH1, INPUT 1
CH1, OUTPUT 1
∆G
CH1, INPUT 2
CH1, INPUT 3
CH1, OUTPUT 2
TO STAGE 1
CONTROL
REGISTER
VSS
BIAS
STAGE 1 CONTROL REGISTER
VSS
BIAS
CH2, INPUT 1
∆G
CH2, OUTPUT 1
CH2, INPUT 2
UNIVERSAL
AMP OUT
UNIVERSAL
AMP IN
BIAS
Figure 1: Device Block Diagram
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
4
MX029
2. Signal List
Pin No.
Type
Description
J, DW
TN
1
1
Serial Clock
This external clock input is used to “clock in” the Control Data.
See Figure 4 for timing information. This input has an internal
1M pullup resistor.
2
4
Control (Data)
Input: Operation of the two amplifier channels (Ch1 - Ch2) is
controlled by the data entered serially at this pin. The data is
entered (bit 13 to bit 0) on the rising edge of the external Serial
Clock. The data format is described in Tables 1-5 and Figure 3.
This input has an internal 1M pullup resistor.
3
5
Load/ Latch
This function governs the loading and execution of the control
data. During serial data loading this input should be kept at a
logical “1” to ensure that data rippling past the latches has no
effect. When all 14 bits have been loaded this input should be
strobed “1 - 0 -1” to latch the new data in. Data is executed on
the rising edge of the strobe.
4
6
Ch 1 Input 1
Analog Input.
5
7
Ch 1 Input 2
Analog Input.
6
8
Ch 2 Input 1
Analog Input.
7
9
Ch 2 Input 2
Analog Input.
8
12
VSS
9
13
VBIAS
10
16
Ch 1 Input 3
Analog Input. Normally used for FSK data.
11
17
Ch 2 Output
Analog Output.
12
18
Ch 1 Output
Analog Output.
13
20
Ch 1 Output
Analog Output.
14
21
Universal
Amp Out
Output from general purpose amplifier.
15
23
Universal
Amp In
Inverting input to general purpose amplifier.
16
24
VDD
Positive supply rail. A single +5-volt power supply is required.
2, 3, 10,
11,14,
15, 19,
22
N/C
No internal connection
1998 MX-COM, INC.
Negative supply (GND).
The output of the on-chip bias circuitry, held at VDD/2.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
5
MX029
3. External Components
VDD
Serial Clock Input
Serial Control Data Input
Load/Latch
Ch 1 Input 1
Ch 1 Input 2
Ch 2 Input 1
Ch 2 Input 2
C1
C2
1
16
2
15
3
14
4
13
5
C3
C4
VSS
MX029
12
6
11
7
10
8
9
C1 to C5
Note 1
C6
VDD
Universal Amp In
Universal Amp Out
Ch 1 Output 1
Ch 1 Output 2
C6
Ch 2 Output
Ch 1 Input 3
C5
VBIAS
0.1µF
±20%
1.0µF
±20%
Notes:
1. Analog input capacitors C1 to C5 are only required for a.c. input signals; d.c. input signals do not
require these components.
Figure 2: Recommended External Components
4. Application
4.1 Recommendations
To avoid noise and instability the following practices are recommended:
1. Use a clean, well-regulated power supply.
2. Keep leads short.
3. Inputs and outputs should be shielded wherever possible.
4. Analog tracks should not run parallel to digital tracks.
5. A “Ground Plane” connected to Vss will assist in eliminating external pick-up on the channel input and
output pins.
6. Avoid running High Level Outputs adjacent to Low Level Inputs.
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
6
MX029
5. Control Data and Timing
The gain and I/O signal path for each section (Channels 1 and 2) is set individually by a 14-bit data word (D0
to D13). Data is loaded on the rising edge of the Serial Clock. Loaded data is executed on the rising edge of
the Load/Latch pulse. The 14-bit word consists of 1 channel address bit (D7) for selection of the channel to
be programmed, 6 bits for setting the gain/attenuation level (D8-D13), 3 bits for input selection (D4 and D6),
and 4 bits for output settings (D0-D3). This format is illustrated in Figure 3.
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
G
SET
G
SET
G
SET
G
SET
G
SET
G
SET
CHAN
ADDR
IN
SEL
IN
SEL
IN
SEL
OUT
SET
OUT
SET
OUT
SET
OUT
SET
GAIN/ATTN LEVEL
CHANNEL
ADDRESS
INPUT SELECT
OUTPUT
SETTINGS
Figure 3: Data Word Format
Tables 1-5 show how the data word is used to control channel selection, gain/attenuation, input selection and
output settings, respectively.
To calculate the data word used to control channel gain/attenuation use the following formula:
gain dB 25 + = The decimal equivalent of binary Data Word
2 For example: using a gain of +34dB,
D13 - D8
+34dB 25 + = 42 = $2A =
2 101010
D13
D12
D11
D10
D9
D8
GAIN SET (dB)
0
0
0
0
0
0
MUTE
0
0
0
0
0
1
-48
0
0
0
0
1
0
-46
0
0
0
0
1
1
-44
0
1
1
0
0
1
0
1
0
1
1
1
0
+42
1
0
1
1
1
1
+44
1
1
0
0
0
0
+46
1
1
0
0
0
1
+48
1
1
0
0
1
0
+48
1
1
0
0
1
1
+48
Table 1: Gain/Attenuation Level
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
7
MX029
D7
Channel Selected
0
1
1
2
Table 2: Channel Selection
D6
D5
D4
INPUTS SELECTED
0
0
0
NONE
0
0
1
1
0
1
0
2
0
1
1
1&2
1
0
0
3
1
0
1
1&3
1
1
0
2&3
1
1
1
1, 2, & 3
Table 3: Input Select
D3
D2
OUTPUT 2 SETTINGS
0
0
high impedance
0
1
amplifier output
1
0
VSS
1
1
VBIAS
Table 4: Settings for Output 2 (Ch 1 only)
D1
D0
OUTPUT 1 SETTINGS
0
0
high impedance
0
1
amplifier output
1
0
VSS
1
1
VBIAS
Table 5: Settings for Output 1
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
8
MX029
6. Performance Specification
6.1 Electrical Performance
6.1.1 Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device.
General
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
Any other pin
-20
20
mA
800
mW Max.
10
mW/°C above TAMB 25°C
Total Allowable Power Dissipation at TAMB 25°C
Derating above TAMB 25°C
Operating temperature
-40
85
°C
Storage temperature
-55
125
°C
6.1.2 Operating Limits
Correct operation of the device outside these limits is not implied.
Min.
Typ.
Max.
VDD
4.5
5.0
5.5
V
Operating temperature
-40
85
°C
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Units
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
9
MX029
6.1.3 Operating Characteristics
For the following conditions unless otherwise specified:
VDD = 5.0V, TAMB = 25°C
Audio level 0dB ref. = 775mVRMS
Notes
Min.
Typ.
Max
Units
Current:
All Stages Operating
3.0
mA
Digital Inputs
Input Logic “1”
3.5
V
Input Logic “0”
1.5
Digital Input Impedance
0.5
1.0
V
M
Gain Control Amplifier Stages
Bandwidth (-3dB)
1
3.3
Output Impedance
Total Harmonic Distortion
2, 4
Interstage Isolation
kHz
1.0
2.0
k
0.35
0.5
%
60.0
Gain/Attenuation
46
Gain/Attenuation Steps (48 total)
dB
48
dB
2.0
dB
Step Error
0.4
Input Impedance
50.0
Input Referred Offset Voltage (VIOS)
dB
k
10
mV
Universal Amplifier
Bandwidth (-3dB)
3
10
Output Impedance
Total Harmonic Distortion
3
Open Loop DC Gain
kHz
1.0
2.0
k
0.35
0.5
%
60
dB
Notes:
1. Gain set to maximum (+48 dB)
2. Gain Set 0dB. Input Level 1kHz -3.0dB (549mVrms)
3. Gain externally set to 10 dB.
4. With a 100k load on the output.
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
10
MX029
6.2 Serial Interface Timing
Parameter
Min.
tPWH
Serial Clock “High” Pulse Width
250
Typ.
Max.
Units
ns
tPWL
Serial Clock “Low” Pulse Width
250
ns
tDS
Data Set-up Time
150
ns
50
tDH
Data Hold Time
tLLO
Load/Latch Over Time
ns
tLLD
Load/Latch Delay
200
ns
tLLW
Load/Latch Pulse Width
150
ns
0
Serial Data Clock Frequency
Serial
Clock
2.0
ns
MHz
t PWH
t PWL
14TH
CLOCK
PULSE
1ST
CLOCK
PULSE
t DS
t DH
Serial
Data
D13
D12
D1
D0
t LLD
Load/Latch
t LLO
t LLW
Figure 4: Serial Timing Diagram
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
11
MX029
6.3 Packaging
Package Tolerances
A
DIM.
B
ALTERNATIVE
PIN
LOCATION
MARKING
A
B
C
E
H
J
L
P
T
Y
E
L
T
PIN 1
Y
C
H
TYP.
MAX.
0.311 (7.90)
0.303 (7.70)
0.169 (4.30)
0.177 (4.50)
---------0.047 (1.20)
0.248 (6.30)
0.256 (6.50)
0.002 (0.05)
0.006 (0.15)
0.007 (0.17)
0.012 (0.30)
0.030 (0.75)
0.020 (0.50)
0.0256 (0.65)
0.003 (0.08)
0.008 (0.20)
0°
8°
NOTE : All dimensions in inches (mm.)
Angles are in degrees
P
J
MIN.
Figure 5: 24-pin TSSOP Mechanical Outline: Order as part no. MX029TN
Package Tolerances
A
Z
ALTERNATIVE
PIN
LOCATION
MARKING
B
E
W
L
T
PIN 1
X
Y
C
H
J
K
P
DIM.
A
B
C
E
H
J
K
L
P
T
W
X
Y
Z
MIN.
TYP.
MAX.
0.413 (10.49)
0.395 (10.03)
0.299 (7.59)
0.286 (7.26)
0.093 (2.36)
0.105 (2.67)
0.419 (10.64)
0.390 (9.90)
0.003 (0.08)
0.020 (0.51)
0.013 (0.33)
0.020 (0.51)
0.041 (1.04)
0.016 (0.41)
0.050 (1.27)
0.050 (1.27)
0.009 (0.23)
0.0125 (0.32)
45°
0°
10°
7°
5°
5°
NOTE : All dimensions in inches (mm.)
Angles are in degrees
Figure 6: 16-pin SOIC Mechanical Outline: Order as part no. MX029DW
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
All trademarks and service marks are held by their respective companies.
Dual Digitally Controlled Amplifier
12
MX029
Package Tolerances
A
DIM.
E1
B
E
T
PIN 1
K
K1
H
L
J
J1
C
P
F
A
B
C
E
E1
F
H
J
J1
K
K1
L
P
T
MIN.
TYP.
0.753 (19.13)
0.285 (7.24)
0.165 (4.19)
0.370 (9.40)
MAX.
0.767 (19.48)
0.291 (7.39)
0.230 (5.84)
0.415 (10.53)
0.300 (7.61)
0.317 (8.04)
0.70 (17.78)
0.020 (0.51)
0.018 (0.46)
0.055 (1.39)
0.053 (1.33)
0.080 (2.03)
0.075 (1.91)
0.080 (2.03)
0.115 (2.92)
0.200 (5.08)
0.100 (2.54)
0.0098 (0.249)
0.0102 (0.259)
NOTE : All dimensions in inches (mm.)
Angles are in degrees
Figure 7: 16-pin CDIP Mechanical Outline: Order as part no. MX029J
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.
Doc. # 20480096.008
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