2
S5N8951X
G.dmt ADSL Analog Front End IC
CONFIDENTIAL
Preliminary Information (Rev.1.0)
Contents
Page
1 Overview
...................................................................................... 3
1.1 General Description .............................................................. 3
1.2 Features ................................................................................. 3
1.3 Absolute Maximum Ratings.................................................. 4
1.4 Electrical Specifications........................................................ 4
2 Signal description
......................................................................... 6
2.1 Functional Block Diagram.................................................... 6
2.2 I/O Pins Descriptions ............................................................ 7
2.3 Pin Configurations ................................................................ 9
3 Block Description
....................................................................... 10
3.1 ADC/DAC............................................................................ 10
3.2 Tx/Rx LPF........................................................................... 10
3.3 Tx/Rx AGC......................................................................... 10
4 Digital Signal Interface
...............................................................11
4.1 Command Signal Interface ..................................................11
4.2 Data Signal Interface .......................................................... 18
5 Application Circuit ...................................................................... 19
5.1 ATU-R ................................................................................. 19
5.2 ATU-C ................................................................................. 20
6 Package Information .................................................................... 21
3
S5N8951X
G.dmt ADSL Analog Front End IC
CONFIDENTIAL
Preliminary Information (Rev.1.0)
1.
OVERVIEW
This chapter provides an overview of the S5N8951X01 ADSL ATU-C & ATU-R
Analog Front End Chip.
1.1
General
Descriptions
The S5N8951X01 is Analog Front End IC designed for DMT based universal
ADSL(Asymmetric Digital Subscribe Line) modems with 0.35u fully CMOS
technology.
It has 25.875 ~ 138KHz Upstream channel and 142.312 ~ 1104KHz bandwidth
Downstream channel. The S5N8951X01 includes AGC, LPF, ADC, DAC. The
AGC has 42dB gain 0.4dB step in RX mode and 24dB gain 2dB step in TX
mode with 12bit/8bit control bits. Anti alias LPF has 1104KHz passband
frequency in RX path and 138KHz in TX path. Samsung' s ADSL AFE chip
provides 14bit ADC at 4.416M or 8.832M sample rates and 14bit 4.416MHz,
8.832MHz DAC.
An 10bit DAC support VCXO control for timing recovery. The VCXO is divided
into a crystal driver at 35.328MHz.
1.2
Features
l
Integrated Analog Front End(AFE) for ADSL ATU-C & ATU-R
l
Complies with G.dmt and G.lite
l
Up to 1104Kbit/s down stream and 138Kbit/s upstream channel
l
14bit 4.416MS/s or 8.832MS/s ADC
l
14bit 4.416MHz or 8.832MHz DAC
l
5
th
-order Low Pass anti-alias Filter TX/RX paths
l
RX 42dB 0.4dB step gain range with 12bit control signal
l
TX -24dB 2dB step gain range with 8bit control signal
l
10bit 4KHz VCXO DAC
l
Fully 0.35um CMOS technology
l
3.3V Power supply operation
l
0.4W Power comsumption
4
S5N8951X
G.dmt ADSL Analog Front End IC
CONFIDENTIAL
Preliminary Information (Rev.1.0)
1.3
Absolute
Maximum Ratings
Symbol
Parameter
Min
Typ
Max
Units
V
DD
DC Supply Voltage
-0.3
3.8
V
DC input Voltage
-0.3
V
DD
+0.3
V
V
IN
5V tolerant
-0.3
5.5
V
I
IN
DC input Current
-10
10
mA
T
OPR
Operation Temperature
-40
85
degree C
T
STG
Storage Temperature
-40
125
degree C
1.4
Electrical
Specifications
Parameter
Min
Typ
Max
Units
Notes/Conditions
General
Power Supply
3.0
3.3
3.6
V
Power Consumption
450
mW
Normal Operation
Rx Path
THD
70
SNR
70
AGC Gain Range
0
42
dB
12bit Control
AGC Step Size
0.4
dB
AGC Step Error
0.2
dB
AGC Input Range
2
Vppd
LPF Cut Off Frequency
1104
KHz
5
th
Butterworth
LPF Output Range
2
Vppd
LPF Pass Band Ripple
-0.5
0.5
dB
LPF Stop Band Attenuation
60
dB
at 4.416MHz
TX Path
THD
70
SNR
70
AGC Gain Range
-24
0
dB
8bit Control
AGC Step Size
2
dB
AGC Step Error
0.2
dB
AGC Output Range
2
Vppd
LPF Cut Off Frequency
138
KHz
5
th
Chebyshev
LPF Pass Band Ripple
-0.5
0.5
dB
LPF Stop Band Attenuation
24
dB
at 276KHz
LPF Input Range
2
Vppd
ADC
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