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Analog Devices Semiconductor Electronic Components Datasheet



AD6440

Analog Front End



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AD6440 pdf
a
FEATURES
Complete Analog Front End for ADSL Modems
Part of ADI ADSL Chipset (AD20msp930)
Designed to ANSI T1.413/ETSI TR238/ITU G.adsl
Performance
e.g., 6.1 Mbps Downstream Over 12K Ft.
Suitable for CO or CPE (ATU-C and ATU-R)
Includes Transmit and Receive Signal Paths:
DAC: 20 MSPS 14-Bit Current Output
ADC: 10 MSPS 12-Bit
PGA: –6 dB–30 dB of Gain with 1 dB Steps
Programmable Filters
8-Bit Auxiliary DAC for Timing Recovery
Interface to 3.3 V or 5 V Digital Logic
Low Power Consumption (525 mW)
80-Lead MQFP
–40؇C to +85؇C Operation
Analog Front End for ADSL
AD6440
GENERAL DESCRIPTION
The AD6440 is a complete analog front end IC (AD6440) for
ADSL systems. Although part of the Analog Devices DMT
chipset, it is suitable for use with digital implementations from
other suppliers.
As part of the AD20msp930 chipset, it complements the
AD6449; together with the line driver and an external filter,
they make a complete ADSL datapump, designed to comply
with ANSI and ETSI standards for DMT-based ADSL.
The AD6440 includes both transmit and receive paths. These
include the DAC (up to 20 MSPS, allowing for oversampling of
the downstream transmit signal), ADC (up to 10 MSPS), low
noise PGA and filters. The filters are software configurable for
both the CO and RT modes. There is an 8-bit auxiliary DAC
(e.g., for timing recovery).
The AD6440 has been designed to be versatile, and most blocks
can be used or externally bypassed.
TX[13:0]
14
CPORT
4
VCXO
RX[11:0]
12
FUNCTIONAL BLOCK DIAGRAM
TX DAC OUT AEC DAC OUT
22
AEC FIL IN TX FIL IN
22
14
MUX 14
14-BIT
DAC
14-BIT
DAC
CONTROL
LOGIC
8-BIT
DAC
12-BIT
ADC
AD6440 (AFIC+)
BUF
A = 0, 8dB
A = 0, 8dB
A = 0, –6, –12dB
ANALOG
FILTER
A = 0, –6, –12dB
ANALOG
FILTER
2
TX FIL OUT
TO
LINE DRIVER
2
AEC FIL OUT
TO
HYBRID
ANALOG
FILTER
2
PGA/EQ
A = –6 TO +30dB,
BOOST = 0 – 20dB
@1.1MHz
2
PGA IN
FROM
HYBRID
2
RX ADC IN
RX FIL OUT
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999



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AD6440 pdf
AD6440–SPECIFICATIONS
Parameter
TRANSMIT AND AEC CHANNELS
THD (Co Mode)
Min
Typ
76
Max Units
dB
SNR (Co Mode)
83.5 dB
THD (Rt Mode)
77 dB
SNR (Rt Mode)
88 dB
DAC
Resolution
Linearity
SNR
Max Sample Rate
Data Format
Output Compliance Range
8 dB Gain Stage/LP Filter
Input Impedance
Filter Response
Output Voltage Range
Gain Variation
CO Mode
3 dB Frequency
Passband
Passband Ripple
RT Mode
3 dB Frequency
Passband
Passband Ripple
ISDN Mode
3 dB Frequency
Passband
Passband Ripple
RECEIVE CHANNEL
THD
SNR
Input Impedance
17.664
14
11.5
12.5
± 1.0
7.2 k ʈ2 pF
5.0
± 0.5
2.5
1.1
± 0.5
195
138
± 0.5
390
138–276
± 0.5
74
75
20 kʈ2 pF
13 kʈC
(13 k +
13 k ʈC)
Bits
Bits
Bits
MHz
V ppd
V ppd
dB
MHz
MHz
dB
kHz
kHz
dB
kHz
kHz
dB
dB
dB
Notes
Sine Wave @ 400 kHz
DAC CK = 17.66 MHz
Output Voltage = 5 V ppd
To 5th Harmonic
Sine Wave @ 400 kHz
Bandlimited at 1.1 MHz
DAC CK = 17.66 MHz
Output Voltage = 5 V ppd
Sine Wave @ 30 kHz
DAC CK = 17.66 MHz
Output Voltage = 5 V ppd
To 5th Harmonic
Sine Wave @ 400 kHz
Bandlimited at 138 kHz
DAC CK = 17.66 MHz
Output Voltage = 5 V ppd
Straight Binary
IFS = 10 mA
± 30% Differential
4th Order Butterworth
Load Impedance 10 k, 15 pF into 2.3 V
@ 400 kHz for 0 dB, –6 dB, and
–12 dB Attenuation
± 20%
Relative to 400 kHz
± 15%
Relative to 400 kHz
± 20%
Sine Wave @ 400 kHz, Bandlimited at 1.1 MHz,
PGA Gain = 18 dB, ADC CK = 8.832 MHz,
Output Voltage = 5 V ppd
± 30% Single-Ended, PGA Gain Ն 6 dB
(Setting Ն 100000)
± 30% Single-Ended, 0 Յ PGA Gain Յ 6 dB
(011000 to 011111)
± 30% Single-Ended, –6 Յ PGA Gain Յ 0 dB
(010000 to 010111)
hfbsel = 0xx; C = 25 pF
hfbsel = 100; C = 35 pF
hfbsel = 101; C = 40 pF
hfbsel = 110; C = 60 pF
hfbsel = 111; C = 90 pF
–2– REV. 0



Part Number AD6440
Description Analog Front End
Maker Analog Devices - Analog Devices
Total Page 12 Pages
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