AFE1115 Datasheet, PDF (1/14 Pages) Burr-Brown (TI) – HDSL/MDSL ANALOG FRONT END WITH VCXO

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AFE1115 _®
AFE1115
SBWS005
HDSL/MDSL ANALOG FRONT END WITH VCXO
FEATURES
q COMPLETE HDSL ANALOG INTERFACE
q E1, T1 AND MDSL OPERATION
q VCXO AND VCXO CONTROL CIRCUITRY
DESCRIPTION
Burr-Brown’s Analog Front End greatly reduces the
size and cost of an HDSL (High bit rate Digital
Subscriber Line) system by providing all of the active
analog circuitry needed to connect an HDSL digital
signal processor to an external compromise hybrid and
a HDSL line transformer. The transmit and receive
filter responses automatically change with clock fre-
quency—allowing the AFE1115 to operate over a
range of data rates from 196kbps to 1.168Mbps.
Functionally, this unit consists of a transmit and a
receive section with a VCXO (Voltage Controlled
q +5V ONLY (5V or 3.3V Digital)
q SCALEABLE DATA RATE
q 300mW POWER DISSIPATION
q 56-PIN SSOP
Crystal Oscillator) control DAC and VCXO circuitry.
The transmit section generates, filters, and buffers
outgoing 2B1Q data. The receive section filters and
digitizes the symbol data received on the telephone
line. Data to the VCXO and symbol data are sent to the
AFE1115 via two serial interfaces; the receive data is
available as a 14-bit parallel word. 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 small 56-pin SSOP package.
vcDATA
vcSCLK
vcLE
VCXO
DAC
Pulse
Former
Filter
Oscillator
Output
Buffer
vcDAC
VCXO Output
VCXO Input
VCXO Output Clock
txLINE+
txLINE–
PLL_OUT
PLL_IN
txDATA+
txSCLK
txCLK
rxSYNC
rxLOOP
2
rxGAIN
14
rxDATA
Transmit
Control
Receive
Control
Decimation
Filter
Voltage
Reference
REF_P
V_CM
REF_N
Delta-Sigma
Modulator
rxLINE+
rxLINE–
rxHYB+
rxHYB–
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
©_{1997 Burr-Brown Corporation}
PDS-11384
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AFPrEint1ed1in1U5.S.A. July, 1997