MSCBT

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Technical content

The MSCBT IC is a CMOS chip that has the ana- log signal processing functions required by cellular phones and radio and other full duplex and half duplex devices. The MSCBT integrated circuit allows bi-directional transmit and receive gain volume and filtering for the voice band. In addition, the MSCBT provides the filter needed for Continuous Tone Control Squelch System (CTCSS) and Continuous Digital ControlSquelch System(CDCSS) generation and detection. A comparator in the MSCBT allows for the recovered squelch or DTMF tones to be applied to a microcontroller for decoding. An internal highpass filter attenuates the tones from the voice band, by 50 dB, preventing voice from effecting tone transmission. A limiter increases the voice signals to be transmitted to 2Vpp for more effective modulation. The transmit output is fil- tered to a selectable 2.55 or 3kHz bandwidth before gain adjusts. A differential output is pro- vided for interface with a variety of FM transmitter choices. The MSCBT will operate from 3.3 V to 5.5 VDC. The MSCBT is available in a 32 pin 7x7mm LQFP. Function down to 3.3 VDC Low Power Consumption

50 CTCSS Squelch Tones filtered

Programmable filter for pre-detection filtering Comparator for direct uP interface of detected signals Family Radio Service (FRS) 2-way Radio Land Mobile Radio (LMR) 2 way Radios General Mobile Radio Service (GMRS) 2 way Radios Low Power Radio Service (LPRS) 2 way Cellular Non-standard Voice-band communications Wired and Wireless Intercom Half-Duplex Speakerphone Analog Signal Processing Full-Duplex Speakerphone Analog Signal Processing Absolute MMaximum RRatings______ Power Supply Voltage +6v Storage Temperature -60 to +150 °C Operating Temperature -20 to +85 °C MSCBT Communications Baseband Transceiver Data Sheet www.mix-sig.com © 2014 Mixed Signal Integration 1 RXIN

67 Hz to 500 Hz CxCSS Tone

VDDD VDDA AGND BYPASS DGND VSS X1 X2 RECEIVED SIGNAL SIGNAL PROCESSING SERIAL CONTROL INTERFACE TRANSMIT SIGNAL PROCESSING 8-BIT A-to-D CONVERTER 8-BIT D-to-A CONVERTER 8-BIT D-to-A CONVERTER Figure 1: MSCBT Block Diagram

Electrical Characteristics

(VDD = +3.3V, T = 25o C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC Specifications Operating Voltage VDD 3.3 5.0 5.5 V Supply Current IDD 4.0 mA Power Down Current IDD PD 300 500 uA Analog Ref. Voltage VREF 0.5*VDD V Input Voltage Low VIL 0.3*VDD V Input Voltage High VIH 0.7*VDD V Output Voltage Low VOL 0.3 V Output Voltage High VOH 0.8*VDD V Input Current 10 uA Output Current High IOH 200 uA Output Current Low IOL 2 mA AC Specifications Serial Data Clock Rate 0.2 MHz CTCSS Passband Gain 250 Hz -1 1 dB CTCSS Stopband Gain 500 Hz -35 dB Speech Filter Passband Gain -1 1 dB Speech Filter Stopband Gain Master Clock Frequency 3.57955 MHz www.mix-sig.com © 2014 Mixed Signal Integration 2 MSCBT Communications Baseband Transceiver Data Sheet The MSCBT is controlled by a serial data word which contains both the address and and data in a single 16 bit string. Figure 3 shows the timing of the Serial data clock, sync pulse and data I/O. For Analog to Digital conversion, the data port changes from input to output when the ADC is read and with the transition of high to low of ENBL. Figure 4 gives the details. Note that the I/O connected to DA T A must switch from output to input after the first cycle after ENBL going low. Note that to simplify the text the CTCSS and CDCSS filters are referred to as CxCSS filters.

www.mix-sig.com ©2014 Mixed Signal Integration 5 SSerial IInterface RRegisters_______ ADDRESS DATA R/W A4 A3 A2 A1 A0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

1 X X 0 0 0 GATT4 SW2 SW1 SW5 X X

1 X X 0 0 1 GAIN0 LIMITER POTVOL X

1 X X 0 1 0 GATT0 SW3 SLPF GATT1

1 X X 0 1 1 SW4 GATT2 CXCSSFILTER

1 X X 1 0 0 X XXXXA T T N TXSUM X X

1 X X 1 0 1 G A T T 3 XXXXX

1 X X 1 1 0 ADAC DAC X

1 X X 1 1 1 0 0 ANALOG TO DIGITAL CONVERTER WRITE (DON’T CARE)

R/W D7 D6 D5 D4 D3 D2 D1 D0 A/D CONVERTER 0 DATA DATA DATA DATA DATA DATA DATA DATA OUTPUT ADDRESS DATA R/W A4 A3 A2 A1 A0 D9 D8 D7 D6 GATT4 D5 D4 SWITCH 2 D3 SWITCH 1 D2 SWITCH 5 D1 D0 1 X X 0 0 0 0 0 0 0 -4.0 0 0 RX with DE 0 OFF 0 OFF X X 1 X X 0 0 0 0 0 0 1 -3.5 0 1 RX FLAT 1 ON 1 ON X X 1 X X 0 0 0 0 0 1 0 -3.0 1 0 TX with PE 1 X X 0 0 0 0 0 1 1 -2.5 1 1 TX FLAT 1 X X 0 0 0 0 1 0 0 -2.0 1 X X 0 0 0 0 1 0 1 -1.5 1 X X 0 0 0 0 1 1 0 -1.0 1 X X 0 0 0 0 1 1 1 -0.5 1 X X 0 0 0 1 0 0 0 -0.0 1 X X 0 0 0 1 0 0 1 +0.5 1 X X 0 0 0 1 0 1 0 +1.0 1 X X 0 0 0 1 0 1 1 +1.5 1 X X 0 0 0 1 1 0 0 +2.0 1 X X 0 0 0 1 1 0 1 +2.5 1 X X 0 0 0 1 1 1 0 +3.0 1 X X 0 0 0 1 1 1 1 +3.5 10//2014 Communications Baseband Transceiver Data Sheet MSCBT

www.mix-sig.com ©2014 Mixed Signal Integration 6 ADDRESS DATA R/W A4 A3 A2 A1 A0 D9 D8 D7 D6 GATT0 D5 SWITCH 3 D4 SLPF D2 D1 D1 D0 GATT1 1 X X 0 1 0 0 0 0 0 -4.0 0 LIMITER 0 3kHz 0 0 0 0 0.0 dB 1 X X 0 1 0 0 0 0 1 -3.5 1 GATT1 1 2.55kHz 0 0 0 1 0.5 1 X X 0 1 0 0 0 1 0 -3.0 0 0 1 0 1.0 1 X X 0 1 0 0 0 1 1 -2.5 0 0 1 1 1.5 1 X X 0 1 0 0 1 0 0 -2.0 0 1 0 0 2.0 1 X X 0 1 0 0 1 0 1 -1.5 0 1 0 1 2.5 1 X X 0 1 0 0 1 1 0 -1.0 0 1 1 0 3.0 1 X X 0 1 0 0 1 1 1 -0.5 0 1 1 1 3.5 1 X X 0 1 0 1 0 0 0 -0.0 1 0 0 0 4.0 1 X X 0 1 0 1 0 0 1 +0.5 1 0 0 1 4.5 1 X X 0 1 0 1 0 1 0 +1.0 1 0 1 0 5.0 1 X X 0 1 0 1 0 1 1 +1.5 1 0 1 1 5.5 1 X X 0 1 0 1 1 0 0 +2.0 1 1 0 0 6.0 1 X X 0 1 0 1 1 0 1 +2.5 1 1 0 1 6.5 1 X X 0 1 0 1 1 1 0 +3.0 1 1 1 0 7.0 1 X X 0 1 0 1 1 1 1 +3.5 1 1 1 1 7.5 ADDRESS DATA R/W A4 A3 A2 A1 A0 D9 D8 D7 AMP GAIN D6 D5 LIMM D4 D3 D2 D1 POTENTIOMETER VOLUME D0 1 X X 0 0 1 0 0 0 +0.0 dB 0 0 -2.4 dB 0 0 0 0 MUTE X 1 X X 0 0 1 0 0 1 +15.0 0 1 -4.2 0 0 0 1 -2.5 dB X 1 X X 0 0 1 0 1 0 +18.3 1 0 -6.0 0 0 1 0 -5 x 1 X X 0 0 1 0 1 1 +21.7 1 1 -7.8 0 0 1 1 -7.5 x 1 X X 0 0 1 1 0 0 +25.0 0 1 0 0 -10.0 x 1 X X 0 0 1 1 0 1 +28.3 0 1 0 1 -12.5 x 1 X X 0 0 1 1 1 0 +31.7 0 1 1 0 -15.0 x 1 X X 0 0 1 1 1 1 +35.0 0 1 1 1 -17.5 x 1 X X 0 0 1 1 0 0 1 0 0 0 -20.0 x 1 X X 0 0 1 1 0 0 1 0 0 1 -22.5 x 1 X X 0 0 1 1 0 1 1 0 1 0 -25.0 x 1 X X 0 0 1 1 0 1 1 0 1 1 -27.5 x 1 X X 0 0 1 1 1 0 1 1 0 0 -30.0 X 1 X X 0 0 1 1 1 0 1 1 0 1 -32.5 X 1 X X 0 0 1 1 1 1 1 1 1 0 -35.0 X 1 X X 0 0 1 1 1 1 1 1 1 1 -37.5 X MSCBT Communications Baseband Transceiver Data Sheet

R/W A4 A3 A2 A1 A0 D9 SW4 D8 D7 D6 D5 GATT2 D4 D3 D2 D1 D0 CxCSS FILTER 1 X X 0 1 1 0 RDIN 0 0 0 0 -3.0 dB 0 0 0 0 0 50 Hz 1 X X 0 1 1 1 TDIN 0 0 0 1 -2.5 0 0 0 0 1 59.2 1 X X 0 1 1 0 0 1 0 -2.0 0 0 0 1 0 69.6 1 X X 0 1 1 0 0 1 1 -1.5 0 0 0 1 1 80 1 X X 0 1 1 0 1 0 0 -1.0 0 1 0 0 0 88.9 1 X X 0 1 1 0 1 0 1 -0.5 0 1 0 0 1 100 1 X X 0 1 1 0 1 1 0 +0.0 0 1 0 1 0 110.3 1 X X 0 1 1 0 1 1 1 +0.5 0 1 0 1 1 118.5 1 X X 0 1 1 1 0 0 0 +1.0 0 1 1 0 0 128 1 X X 0 1 1 1 0 0 1 +1.5 0 1 0 0 1 139.1 1 X X 0 1 1 1 0 1 0 +2.0 0 1 0 1 0 150 1 X X 0 1 1 1 0 1 1 +2.5 0 1 0 1 1 160 1 X X 0 1 1 1 1 0 1 +12.0 0 1 1 0 0 168.4 1 X X 0 1 1 1 1 1 0 +12.5 0 1 1 0 1 177.8 1 X X 0 1 1 1 1 1 0 +13.0 0 1 1 1 0 188.2 1 X X 0 1 1 1 1 1 1 +13.5 0 1 1 1 1 200 1 X X 0 1 1 1 0 0 0 0 206.4 1 X X 0 1 1 1 0 0 0 1 220.7 1 X X 0 1 1 1 0 0 1 0 228.6

1 X X 0 1 1 1 0 0 1 1 237

1 X X 0 1 1 1 0 1 0 0 246.1

1 X X 0 1 1 1 0 1 0 1 256

1 X X 0 1 1 1 0 1 1 0 266

1 X X 0 1 1 1 0 1 1 1 278.3 1 X X 0 1 1 1 1 0 0 0 290.9

1 X X 0 1 1 1 1 0 0 1 300

1 X X 0 1 1 1 1 0 1 0 UNDEFINED

1 X X 0 1 1 1 1 0 1 1 UNDEFINED

1 X X 0 1 1 1 1 1 0 0 UNDEFINED

1 X X 0 1 1 1 1 1 0 1 UNDEFINED

1 X X 0 1 1 1 1 1 1 0 UNDEFINED

1 X X 0 1 1 1 1 1 1 1 UNDEFINED

www.mix-sig.com © 2014 Mixed Signal Integration 7 MSCBT Communications Baseband Transceiver Data Sheet

R/W A4 A3 A2 A1 A0 D9 D8 D7 D6 D5 GATT3 D4 D3 D2 D1 D0 1 X X 1 0 1 0 0 0 0 0 -4.00 dB X X X X X 1 X X 1 0 1 0 0 0 0 1 -3.75 X X X X X 1 X X 1 0 1 0 0 0 1 0 -3.50 X X X X X 1 X X 1 0 1 0 0 0 1 1 -3.25 X X X X X 1 X X 1 0 1 0 0 1 0 0 -3.00 X X X X X 1 X X 1 0 1 0 0 1 0 1 -2.75 X X X X X 1 X X 1 0 1 0 0 1 1 0 -2.50 X X X X X 1 X X 1 0 1 0 0 1 1 1 -2.25 X X X X X 1 X X 1 0 1 0 1 0 0 0 -2.00 X X X X X 1 X X 1 0 1 0 1 0 0 1 -1.75 X X X X X 1 X X 1 0 1 0 1 0 1 0 -1.50 X X X X X 1 X X 1 0 1 0 1 0 1 1 -1.25 X X X X X 1 X X 1 0 1 0 1 1 0 0 -1.00 X X X X X 1 X X 1 0 1 0 1 1 0 1 -0.75 X X X X X 1 X X 1 0 1 0 1 1 1 0 -0.50 X X X X X 1 X X 1 0 1 0 1 1 1 1 -0.25 X X X X X 1 X X 1 0 1 1 0 0 0 0 -0.00 X X X X X 1 X X 1 0 1 1 0 0 0 1 +0.25 X X X X X 1 X X 1 0 1 1 0 0 1 0 +0.50 X X X X X 1 X X 1 0 1 1 0 0 1 1 +0.75 X X X X X 1 X X 1 0 1 1 0 1 0 0 +1.00 X X X X X 1 X X 1 0 1 1 0 1 0 1 +1.25 X X X X X 1 X X 1 0 1 1 0 1 1 0 +1.50 X X X X X 1 X X 1 0 1 1 0 1 1 1 +1.75 X X X X X 1 X X 1 0 1 1 1 0 0 0 +2.00 X X X X X 1 X X 1 0 1 1 1 0 0 1 +2.25 X X X X X 1 X X 1 0 1 1 1 0 1 0 +2.50 X X X X X 1 X X 1 0 1 1 1 0 1 1 +2.75 X X X X X 1 X X 1 0 1 1 1 1 0 0 +3.00 X X X X X 1 X X 1 0 1 1 1 1 0 1 +3.25 X X X X X 1 X X 1 0 1 1 1 1 1 0 +3.50 X X X X X 1 X X 1 0 1 1 1 1 1 1 +3.75 X X X X X ADDRESS DATA R/W A4 A3 A2 A1 A0 D9 D8 D7 D6 D5 D4 ATTN D3 D2 TXSUM D1 D0

1 X X 1 0 0 X X X X X 0 0 0 0 MUTE X X

1 X X 1 0 0 X X X X X 1 -6 0 1 TX AUDIO 0dB X X

1 X X 1 0 0 X X X X X 1 0 SUBAUDIO 0dB X X

1 X X 1 0 0 X X X X X 1 1 TX AUDIO 0dB X X

SUM SUB AUDIO -15.6 dB Communications Baseband Transceiver Data Sheet www.mix-sig.com ©2014 Mixed Signal Integration 8

www.mix-sig.com ©2014 Mixed Signal Integration 9 ADDRESS DATA R/W A4 A3 A2 A1 A0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D1 D0

1 X X 1 1 1 0 0 X X X X X X X X X

R/W A4 A3 A2 A1 A0 D9 DAC D8 D7 D6 D5 D4 D3 D2 D1 DAC2 OUTPUT DAC1 OUTPUT D0 1 X X 1 1 0 0 DAC1 0 0 0 0 0 0 0 0 LAST SETTING 0.0 V X 1 X X 1 1 0 0 DAC1 0 0 0 0 0 1 0 0 LAST SETTING 0.052 X 1 X X 1 1 0 0 DAC1 0 0 0 0 1 0 0 0 LAST SETTING 0.103 X 1 X X 1 1 0 0 DAC1 0 0 0 1 0 0 0 0 LAST SETTING 0.2063 X 1 X X 1 1 0 0 DAC1 0 0 1 0 0 0 0 0 LAST SETTING 0.413 X 1 X X 1 1 0 0 DAC1 0 1 0 0 0 0 0 0 LAST SETTING 0.826 X 1 X X 1 1 0 0 DAC1 1 0 0 0 0 0 0 0 LAST SETTING 1.60 X 1 X X 1 1 0 0 DAC1 1 1 1 1 1 1 1 1 LAST SETTING 3.30 X 1 X X 1 1 0 1 DAC2 0 0 0 0 0 0 0 0 0.0V LAST SETTING X 1 X X 1 1 0 1 DAC2 0 0 0 0 0 1 0 0 0.052 LAST SETTING X 1 X X 1 1 0 1 DAC2 0 0 0 0 1 0 0 0 0.103 LAST SETTING X 1 X X 1 1 0 1 DAC2 0 0 0 1 0 0 0 0 0.2063 LAST SETTING X 1 X X 1 1 0 1 DAC2 0 0 1 0 0 0 0 0 0.413 LAST SETTING X 1 X X 1 1 0 1 DAC2 0 1 0 0 0 0 0 0 0.826 LAST SETTING X 1 X X 1 1 0 1 DAC2 1 0 0 0 0 0 0 0 1.65 LAST SETTING X 1 X X 1 1 0 1 DAC2 1 1 1 1 1 1 1 1 3.3 LAST SETTING X MSCBT Communications Baseband Transceiver Data Sheet RRead Analog to DDigital Converter______ OUTPUT/INPUTCONTROL DATA R/W D7 D6 D5 D4 D3 D2 D1 D1 D0

0 MSB DATA DATA DATA DATA DATA DATA DATA LSB

Mixed Signal Integration Corporation reserves the right to change any product or specification without notice at any time. Mix ed Signal Integration products are not designed or authorized for use in life support systems. Mixed Signal Integration assumes no respo nsibility for errors in this document.

www.mix-sig.com ©2014 Mixed Signal Integration 10 Communications Baseband Transceiver Data Sheet MSCBT NC_1 VDDA RXIN TXTONE ADIN NC_6 NC_7 SLEEP DAC1O DAC2O ENABLE CLOCK RESET VREF DVDD DATA DGND RXTIN+ COMPOUT RXTIN- CxCSSTOUT AGND TONEIN BYPASS NC_27 SPKOUT MICIN RXIN1 OUT- OUT+ MSCBT Pin Number Pin Name Description

1 NC_1 DO NOT CONNECT TO

THIS PIN. For testing only 2 VDDA Positive Analog Supply. Nominally 3.30 VDC. Decouple with 0.1 uF cap. 3 RXIN Receive signal pin input. This is the input for CTCSS or CDCSS filtering.

4 TXTONE Transmit modulation signal input

data filter input.

5 ADIN Analog to Digital converter

6 NC_6 DO NOT CONNECT TO

THIS PIN. For testing only

7 NC_7 DO NOT CONNECT TO

THISPIN. For testing only

8 SLEEP Power down when Low

Pin Number Pin Name Description

9 DAC1O DAC1 OUTPUT

10 DAC2O DAC2 OUTPUT

11 ENABLE Enables serial I/O port

when low.

12 CLOCK Serial Data Clock input

13 RESET Resets Digital functions

14 VREF Voltage Reference. Generated internally Decouple with 10 uF capacitor

15 DVDD DIGITAL POSITIVE SUPPLY

A 0.1 uF decoupling capacitor is needed. nominally 3.3VDC

16 X2 CRYSTAL OSCILLATOR OUTPUT

3.579545 MHz crystal is tied

17 X1 CRYSTAL OSCILLATOR INPUT

18 DATA SERIAL DATA I/O

This input becomes an output when reading A/D converter 19 DGND DIGITAL GROUND. Tie to 0VDC

20 RXTIN+ POSITIVE COMPARATOR INPUT

21 COMPOUT COMPARATOR OUTPUT

22 RXTIN- NEGATIVE COMPARATOR INPUT

23 CxCSSOUT TONE FILTER OUTPUT

24 AGND ANALOG GROUND (0Vdc)

25 TONEIN CxCSS or DTMF TONE

27 AGND ANALOG GROUND (0Vdc)

28 BYPASS TIE 10 uF CAPACITOR TO AGND

NC_1 VDDA RXIN TXTONE ADIN NC_6 NC_7 SLEEP DAC1O DAC2O ENABLE CLOCK RESET VREF DVDD DATA DGND RXTIN+ COMPOUT RXTIN- CxCSSTOUT AGND TONEIN BYPASS NC_27 SPKOUT MICIN RXIN1 OUT- OUT+ MSCBTAnalog_to_Digital_In HC-49/U_3MHz

3.579545 MHz

3.3V VDD 100nF 10uF 3.3V VDD 100nF 10uF Digital_to_Analog_o1 Digital_to_Analog_o2 10kohm Enable_Data_I_0 10kohm Data_Clock_I_O 100nF 1.0Mohm 10kohm CxCSS_DECODE_OUT 10kohm 10kohm Demod_Tones_In Transmit_Tone_In Serial_Data_In CxCSS_TX_OUT DTMF_Input C8 470nF To_Modulator_N To_Modulator_P From_Receive_Audio From_TX_Microphone To_Speaker_Amp 10//2014 Communications Baseband Transceiver Data Sheet www.mix-sig.com ©2014 Mixed Signal Integration 11 PPin DDescriptions (Continued))_______ Pin Number Pin Name Description

29 MICIN Microphone Audio Input

+10 dB fixed Gain on Input

30 RXIN1 Receive Audio Input

+10 dB fixed Gain on Input Pin Number Pin Name Description

31 OUT+ Positive Modulator Output

32 OUT- Positive Modulator Output

Figure 5: MSCBT Evaluation Circuit MSCBT

www.mix-sig.com © 2014 Mixed Signal Integration 12 MSCBT Communications Baseband Transceiver Data Sheet Mixed Signal Integration 2157-50 O'Toole Avenue San Jose, California 95131-1332 Phone: (408)-434-6305 IF YOUR STATE OR COUNTRY IS NOT LISTED BELOW, PLEASE CONTACT MSI DIRECTLY In Mississippi, Alabama, Georgia In Arizona, Utah, Colorado, Montana, South Carolina, North Carolina, and Wyoming, New Mexico Tennessee contact: contact: AdeptRep Mountain View Technical Sales

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