stlc1511 STMicroelectronics, stlc1511 Datasheet - Page 18

• Manufacturer Part Number: stlc1511
• Description: Northenlite?? G.lite Bicmos Analog Front-end Circuit
• Manufacturer: STMicroelectronics

STLC1511
3.5 Reference Voltages
Table 7. Reference Voltages/Currents
3.6 Serial Interface
The serial interface on the AFE provides for transmis-
sion of transmit and receive data between the
STLC1511 and digital modem ASIC. This is accom-
plished with a two bit wide data stream in each direc-
tion plus the appropriate clocks. The data for the
transmit path is input to the AFE on the TXSIN[1:0]
pins and the data for the receive path is output on the
RXSOUT[1:0] pins.
The serial interface also consists of a 35.328MHz
clock (CK35M) which is generated in the STLC1510
and is used to retime the Tx data sent to the
STLC1511. It is also used in the STLC1511 to retime
18/31
Unless otherwise noted, typical specifications apply for VCC = 5.0 V, temperature=25×C, nominal process and bias
current. Maximum and minimum performance is with VCC ± 5%, -40 =<T
and bias current.
V3P75V Output voltage
Output Referred Noise Voltage
at ANG
TXDADC1 Output voltage
TXDADC1 Output current
External resistor at IREF
External capacitor at V3P75V
Description
3.6375
2.425
49
min
3.750
2.5V
50
0.22
typ
the Rx data before it is sent to the digital chip.
A 4.416MHz pulse is also output from the STLC1511.
This pulse on pin FRMCLK is used to indicate the
start of the output and input data words. The align-
ment of the data to the FRMCLK signal is shown be-
3.8625
10
2.575
50
51
low.
A diagram of this interface is show in Figure 11.
Note the MSB of each of the 8-bit registers is trans-
ferred first (MSB = b15/ b7.)
Note that the data word used by the converters is in
2’s complement notation.
max
Volts
Volts
mA
kW
mF
junction
---------- -
Units
nV
Hz
=< 105×C, and worst case process
measured at V3P75V
measured at V3P75V
measured at TXDADC1
measured at TXDADC1
assume 2%
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