73M1903C-EVM Maxim Integrated Products, 73M1903C-EVM Datasheet - Page 13

• Manufacturer Part Number: 73M1903C-EVM
• Description: BOARD DEMO 73M1903C WORLDWIDE
• Manufacturer: Maxim Integrated Products

Specifications of 73M1903C-EVM

• Main Purpose: Interface, Analog Front End (AFE)
• Utilized Ic / Part: *
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Embedded: -

DS_1903C_033
3 System Control Registers
Register00 (CTRL): Address 00h
Reset State 08h
Bit 7
ENFE
ENFE
SelTX2
TXBST1
TXBST0
TXDIS
RXG(1:0)
RXGAIN
Rev. 5.0
Bit 6
SelTX2
(0X00[7])
1 = Enable the digital filters and analog front end.
0 = Disable the analog blocks shut off the clocks to the digital and analog receive/transmit
circuits.
(0X00[6])
1 = Selects Secondary transmitter (TXAP2 and TXAN2) if TXDIS=0
0 = Selects Primary transmitter (TXAP1 andTXAN1) if TXDIS=0
(0X00[5])
1 = Add a gain of 1.335dB (16.6%) to the transmitter; also the common mode voltage of the
transmit path is increased to 1.586 V. This is intended for enhancing DTMF transmit power
only and should not be used in data mode.
0 = No gain is added
(0X00[4])
1 = A gain of 1.65 dB(21%) is added to the transmitter
0 = The gain of the transmitter is nominal
(0X00[3])
1 = Tri-state the TXAP1,2 and TXAN1,2 pins, provides a bias of VBG into 80 k Ω for each
output pin
(0X00[2:1]) Rx Gain Selection
00 = 6 dB Receive Gain
01 = 9 dB
10 = 12 dB
11 = 0 dB
(0X00[0])
ID detection.
1 = Increase the gain of the receiver by 20 dB.
0 = Normal operation
Bit 5
TXBST
Enable Front End.
Select Tx driver 2
20 dB RxGain Enable. This gain selection can be used for line snoop or Caller
Bit 4
TXBST0
Bit 3
TXDIS
Bit 2
RXG1
Bit 1
RXG0
Bit 0
RXGAIN
73M1903C Data Sheet
13