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PDF MX839 Data sheet ( Hoja de datos )
| Número de pieza | MX839 | |
| Descripción | Digitally Controlled Analog I/O Processor | |
| Fabricantes | MX-COM | |
| Logotipo |  |
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DATA BULLETIN
MX839
Features
x 4 input intelligent 10 bit A/D monitoring
subsystem
4 High and 4 Low Comparators
External IRQ Generator
Free Running Operation
x Three 8/10 bit DACs
x Two Variable Attenuators
x Selectable A/D Clock Frequencies
x Full Control via 4-wire Serial Interface
x Low Power 3.0 Operation
Digitally Controlled
Analog I/O Processor
PRELIMINARY INFORMATION
Applications
x PCS, Cellular, LMR, Wireless
Transceivers, and General Purpose
x Monitor and Control:
RSSI, Battery State, Temperature,
VSWR, and Error Voltages
x Digital Trim and Calibration:
VCOs, TCXO, Power Output, Bias,
Current, IF Gain, Deviation,
Modulation Depth, and Baseband
Gain
RECEIVER
RSSI
VSWR
RADIO BATTERY STATE 4 x 10 bit Free Run A/D
BATTERY
4 x Hi Comparator
SYSTEM
4 x Low Comparator
IRQ on Compare
3x
8/10 bit
DAC
TEMPERATURE
MX839Clock Osc
& Dividers
C-BUS Interface
& Control Logic
2x
Variable
Attenuator
µC
C-BUS SERIAL BUS 0 : 3
RF TRANSMITTER
TX POWER
REF. OFFSET TRIM
VCO TRIM
MOD 1 OUT
MOD 2 OUT
MOD 1 IN
MOD 2 IN
TRANSMITTER
MODULATOR
The MX839 is a low power CMOS µC peripheral device which provides digitally controlled calibration, trimming, and
monitoring functions for PCS, cellular, LMR, wireless transceivers, and general purpose applications.
Featuring a four input intelligent 10 bit A/D monitoring subsystem, an interrupt generator, three 8/10 bit DACs, and two
variable attenuator functions, the MX839 automatically monitors, produces, and trims up to nine analog signals via a
simple four wire serial control bus. The free running A/D intelligent monitoring subsystem includes independent high and
low limit comparators for each of four analog input signals which can be configured to generate external µC interrupts.
The MX839’s high level of integration reduces end product parts count, component size, and software complexity. MX839
digital trimming functions also reduce manufacturing costs by eliminating manual trimming operations.
Featuring an operating range of 3.0V to 5.5V the MX839 is available in 24-pin SSOP (MX839DS), 24-pin SOIC
(MX839DW), and 24-pin PDIP (MX839P) packages.
© 1998 MXxCOM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480164.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1 page  
Digitally Controlled Analog I/O Processor
3 External Components
5
MX839 PRELIMINARY INFORMATION
XTAL
R1
XTAL/CLOCK
X1 C2
C1
C-BUS
INTERFACE
XTAL 1
24 DVDD
XTAL/CLOCK 2
23 MOD2 OUT
SERIAL CLOCK 3
22 MOD1 OUT
COMMAND DATA 4
21 MOD2 IN
REPLY DATA
CS
IRQ
ADCIN1
5 20 MOD1 IN
6
MX839
19
AVDD
N/C
7 18
8 17 DACOUT3
ADCIN2 9
16 DACOUT2
ADCIN3
R2
10
ADCIN4
11
VSS 12
DACOUT1
15
14 N/C
13 VBIAS
DVDD
C3
DVDD
R3
C5
AVDD
C4 C6
Figure 2: Recommended External Components
R1 1M:
R2 22k:
R3 Note 1 10:
C1 22pF
C2 22pF
C3 0.1µF
±5%
±10%
±10%
±20%
±20%
±20%
C4 Note 1 0.1µF ±20%
C5 0.1µF ±20%
C6 Note 1 10.0µF ±20%
X1 Note 2, 3
±100ppm
Table 1: Recommended External Components
Notes:
1. These values should be determined in regard to the amount of supply filtering required for D/A outputs.
2. If an external clock is to be used, then it should be connected to Pin 2 and the components C1, C2, R1, and X1
omitted. The ADC clock frequency is derived from the crystal or external clock by means of internal programmable
dividers. See Section 6 for details of crystal or external clock frequency range.
3. 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, consult your crystal manufacturer.
© 1998 MXxCOM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480164.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
5 Page 
Digitally Controlled Analog I/O Processor
11
MX839 PRELIMINARY INFORMATION
4.7.3 VARIABLE ATTENUATOR Register (Hex address $D2)
This is a 16-bit register. Byte (1) is sent first. Bits 0 - 5 of the first byte in this register are used to enable and set the
attenuation of the Modulator 1 amplifier. Bits 0 - 5 of the second byte in this register are used to enable and set the
attenuation of the Modulator 2 amplifier. See Table 7.
54321
0XXXX
10000
10000
10001
10001
10010
10010
10011
10011
10100
10100
10101
10101
10110
10110
10111
10111
11000
11000
11001
11001
11010
11010
11011
11011
11100
11100
11101
11101
11110
11110
11111
11111
X = don't care
MOD1 ENABLE
(Bit 5, first byte)
0
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
MOD2 ENABLE
(Bit 5, second byte)
(Bits 7 and 6, first
and second bytes)
Mod. 1 Attenuation
Disabled (VBIAS)
>40dB
12.0dB
11.6dB
11.2dB
10.8dB
10.4dB
10.0dB
9.6dB
9.2dB
8.8dB
8.4dB
8.0dB
7.6dB
7.2dB
6.8dB
6.4dB
6.0dB
5.6dB
5.2dB
4.8dB
4.4dB
4.0dB
3.6dB
3.2dB
2.8dB
2.4dB
2.0dB
1.6dB
1.2dB
0.8dB
0.4dB
0dB
543210
0XXXXX
100000
100001
100010
100011
100100
100101
100110
100111
101000
101001
101010
101011
101100
101101
101110
101111
110000
110001
110010
110011
110100
110101
110110
110111
111000
111001
111010
111011
111100
111101
111110
111111
Mod. 2 Attenuation
Disabled (VBIAS)
>40dB
6.0dB
5.8dB
5.6dB
5.4dB
5.2dB
5.0dB
4.8dB
4.6dB
4.4dB
4.2dB
4.0dB
3.8dB
3.6dB
3.4dB
3.2dB
3.0dB
2.8dB
2.6dB
2.4dB
2.2dB
2.0dB
1.8dB
1.6dB
1.4dB
1.2dB
1.0dB
0.8dB
0.6dB
0.4dB
0.2dB
0dB
When this bit is '1' the MOD1 attenuator is enabled.
When this bit is '0' the MOD1 attenuator is disabled (i.e. powersaved).
When this bit is '1' the MOD2 attenuator is enabled.
When this bit is '0' the MOD2 attenuator is disabled (i.e. powersaved).
Reserved for future use. These should be set to '0'.
Table 7: VARIABLE ATTENUATOR Register (Hex address $D2)
© 1998 MXxCOM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480164.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MX839.PDF ] | |
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