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PDF AFE1124 Data sheet ( Hoja de datos )
| Número de pieza | AFE1124 | |
| Descripción | HDSL/MDSL ANALOG FRONT END | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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AFE1124
AFE1124
HDSL/MDSL ANALOG FRONT END
FEATURES
q SERIAL DIGITAL INTERFACE
q 28-PIN SSOP
q E1, T1 AND MDSL OPERATION
DESCRIPTION
Burr-Brown’s Analog Front End chip greatly reduces
the size and cost of an xDSL (Digital Subscriber Line)
system by providing all of the active analog circuitry
needed to connect a digital signal processor to an
external compromise hybrid and line transformer. The
AFE1124 is optimized for HDSL (High bit rate DSL)
and for lower speed MDSL (Medium speed DSL) and
RADSL (Rate Adaptive DSL) applications. Because
the transmit and receive filter responses automatically
change with clock frequency, the AFE1124 is particu-
larly suitable for RADSL and multiple rate DSL sys-
tems. The device operates over a wide range of data
rates from 64kbps to 1168kbps.
q 64kbps TO 1168kbps OPERATION
q SCALEABLE DATA RATE
q 250mW POWER DISSIPATION
q COMPLETE HDSL ANALOG INTERFACE
q +5V POWER (5V or 3.3V Digital)
Functionally, this unit consists of a transmit and a
receive section. The transmit section generates analog
signals from 2-bit digital symbol data and filters the
analog signals to create 2B1Q symbols. The on board
differential line driver provides a 13.5dBm signal to
the telephone line. The receive section filters and
digitizes the symbol data received on the telephone
line. This IC operates on a single 5V supply. The
digital circuitry in the unit can be connected to a
supply from 3.3V to 5V. It is housed in a 28-pin SSOP
package.
Pulse Former
tx and rx
Interface
Lines
tx and rx
Control
Registers
Decimation
Filter
AFE1124
∆Σ
Modulator
Line Driver
txLINE
txLINE
Difference
Amplifier
rxHYB
rxHYB
Programmable
Gain Amp
rxLINE
rxLINE
Patents Pending
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1997 Burr-Brown Corporation
PDS-11425A
APrinFteEd in1U1.S2.A4. October, 1997
®
1 page  
TYPICAL PERFORMANCE CURVES
At Output of HDSL Pulse Transformer
The curves shown below are measured at the line output of the HDSL transformer. Typical at 25°C, AVDD+ = +5V, DVDD+ = +3.3V, fTX = 1168kHz, unless otherwise specified.
–20
–40
–60
–80
–100
–120
1K
POWER SPECTRAL DENSITY LIMIT
–38dBm/Hz for T1
–40dBm/Hz for E1
–80dB/decade
T1
E1
196kHz
–118dBm/Hz
292kHz
for T1
–120dBm/Hz
for E1
10K 100K
Frequency (Hz)
1M
10M
CURVE 1. Upper Bound of Power Spectral Density Measured at Output of HDSL Transformer.
B = 1.07
C = 1.00
D = 0.93
0.4T 0.4T
1.25T
A = 0.01
F = –0.01
–1.2T
–0.6T 0.5T
E = 0.03
G = –0.16
CURVE 2. Transmitted Pulse Template Measured at HDSL Transformer Output.
H = –0.05
14T
A = 0.01
F = –0.01
50T
INPUT IMPEDANCE vs BIT RATE
200
150
100
T1 = 784kbps,
32kΩ
E1 = 1168kbps,
50 21kΩ
0
100 300 500 700 900 1100 1300
Bit Rate (kbps)
CURVE 3. Input Impedance of rxLINE and rxHYB.
5
AFE1124
®
5 Page 
Transmit
Data
Uncancelled
Echo
txDATP
txLINEP
txLINEN
rxHYBP
AFE1124
rxHYBN
rxLINEP
rxLINEN
rxD13 - rxD0
100pF
1.5kΩ
3kΩ
750Ω
1.5Ω
100pF
750Ω
FIGURE 7. Uncancelled Echo Test Diagram.
13Ω 1:2 5.6Ω
13Ω
5.6Ω
135Ω
S1
®
11 AFE1124
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AFE1124.PDF ] | |
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