STLC1511 Datasheet, PDF (1/31 Pages) STMicroelectronics – NorthenLite™ G.lite BiCMOS Analog Front-End Circuit

s Wide transmit (~80dB) and receive (~69dB)
dynamic range to limit the external filtering
requirements for extended loop reach operation
s Programmable tx gain: 0 ÷ -32dB in 2dB steps
s 14-bit D/A converter in transmit path
s Programmable rx gain: 0 ÷40dB in 0.5dB steps
s 12-bit A/D converter in receive path
s Integrated phase-locked loop with an externall
LC or crystal oscillator
s Low power: 300mW @ 5.0V
s 64-pin TQFP package
1.0 GENERAL DESCRIPTION
The STLC1511 G.lite Analog Front End (AFE) chip
implements the analog transceiver functions required
in both a central office modem and a customer
premise modem. It connects the digital modem chip
with the loop driver and hybrid balance circuits. The
STLC1511 has been designed with excellent dynam-
ic range in order to greatly reduce the external filter-
ing requirements at the front end. The AFE chip and
its companion digital chip along with a loop driver, im-
plement the complete G.992.2 DMT modem solution.
Figure 1. STLC1511 pinout
STLC1511
NorthenLite™ G.lite BiCMOS
Analog Front-End Circuit
PRODUCT PREVIEW
TQFP64
ORDERING NUMBER: STLC1511
The STLC1511 transmit path consists of a 14-bit
Nyquist rate D/A converter, followed by a program-
mable gain amplifier (TxPGA). The transmit gain is
programmable from 0 to -32dB in 2dB steps.
The STLC1511 receive path contains a buffer ampli-
fier followed by a programmable gain amplifier (RxP-
GA), a low pass anti-aliasing filter, and a 12-bit
Nyquist rate A/D converter. The RxPGA is digitally
programmable from 0 to 40dB in 0.5dB steps.
2.0 PACKAGING AND PIN INFORMATION
2.1 STLC1511 Pin Allocation
The pinout for the STLC1511 is depicted in Figure 1.
VDDDIG1
CK35M
DIGREF
RXSOUT[0]
RXSOUT[1]
VSSDIGE1
VSSDIG2
VDDDIGE1
VDDDIG2
DTX
DIGCLK
ENB
DRX
VEEADC
VCCADC
QVEEADC
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
38
12
37
13
36
14
35
15
34
16
33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
QVEEBIAS
VEEBIAS
VCCBIAS
IREF50m
V3P75V
VCCPLL
VEEPLL
FREQ
OSCNE
OSCNB
OSCPB
OSCPE
VCAP
VDDPLL
VSSPLL
QVEEPLL
TQFP64
November 2000
This is preliminary information on a new product now in development. Details are subject to change without notice.
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