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參數資料
| 型號： | AD9875 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Broadband Modem Mixed-Signal Front End |
| 中文描述： | 寬帶調制解調器混合信號前端 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 288K |
| 代理商： | AD9875 |
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
AD9875
Tel: 781/329-4700Fax: 781/326-8703
Analog Devices, Inc., 2001a
Broadband Modem
Mxed-Signal Front End
FUNCT IONAL BLOCK DIAGRAM
REGISTER
CONTROL
Rx
MUX
ADC
PGA
LPF
PGA
TxDAC+
Kx INTERPOLATION
LPF/BPF
Tx
MUX
PLL-A
L
PLL-B
M/N
VRC
3
10
10
10
AD9875
Tx+
Tx–
GATE
FB
OSCIN
XTAL
Rx+
Rx–
PWR DN
Tx QUIET
GAIN
Tx [5:0]
Tx SYNC
CLK-A
CLK-B
Rx SYNC
Rx [5:0]
SPORT
V
REF
CLOCK GEN
PRODUCT DE SCRIPT ION
T he AD9875 is a single supply Broadband modem mixed-
signal front end (MxFE) IC. T he devices contain a transmit
path Interpolation Filter and DAC, and a receive path PGA,
L PF and ADC supporting a variety of Broadband modem
applications. Also on-chip is a PLL clock multiplier that pro-
vides all required clocks from a single crystal or clock input.
T he AD9875 provides 10-bit converter performance on both
the T x and Rx paths.
T he T xDAC+ uses a selectable digital 2
×
or 4
×
interpolation
low-pass or band-pass filter to further oversample transmit
data and reduce the complexity of analog reconstruction filtering.
T he transmit path signal bandwidth can be as high as 26 MHz
at an input data rate of 64 MSPS. T he 10-bit DAC provides
differential current outputs for optimum noise and distortion
performance. T he DAC full-scale current can be adjusted
from 2 mA to 20 mA by a single resistor, providing 20 dB of
additional gain range.
T he receive path consists of a PGA, LPF, and ADC. T he two-stage
PGA has a gain range of –6 dB to +36 dB, and is programmable
in 2 dB steps, adding 42 dB of dynamic range to the receive path.
MxFE is a trademark of Analog Devices, Inc.
T xDAC+ is a registered trademark of Analog Devices, Inc.
T he receive path LPF cutoff frequency can be programmed to either
12 MHz or 26 MHz. T he filter cutoff frequency can also be tuned
or bypassed where filter requirements differ. T he 10-bit ADC uses
a multistage differential pipeline architecture to achieve excellent
dynamic performance with low power consumption.
T he AD9875 provides a voltage regulator controller (VRC) that
can be used with an external power MOSFET transistor to form
a cost-effective 1.3 V linear regulator.
T he digital transmit and receive ports are each multiplexed to a
bus width of 5/6 bits and are clocked at a frequency of twice the
10-bit word rate.
T he AD9875 ADC and/or DAC can also be used at higher
sampling rates as high as 64 MSPS in a 5-bit resolution non-
multiplexed mode.
T he AD9875 is pin-compatible with the 12-bit AD9876. Both are
available in a space-saving 48-lead LQFP package. T hey are speci-
fied over the industrial (–40
°
C to +85
°
C) temperature range.
FEATURES
Low Cost 3.3 V-CMOS Mixed-Signal Front End (
MxFE
)
Converter for Broadband Modems
10-/12-Bit D/A Converter (TxDAC+
)
64/32 MSPS Input Word Rate
2 /4 Interpolating LPF or BPF Transmit Filter
128 MSPS DAC Output Update Rate
Wide (26 MHz) Transmit Bandwidth
Power-Down Mode
10-/12-Bit, 50 MSPS A/D Converter
Fourth Order Low-Pass Filter 12 MHz or 26 MHz
with Bypass
–6 dB to +36 dB Programmable Gain Amplifier
Internal Clock Multiplier (PLL)
Clock Outputs
Voltage Regulator Controller
48-Lead LQFP Package
APPLICATIONS
Powerline Networking
Home Phone Networking
xDSL
Broadband Wireless
Home RF
相關PDF資料 |
PDF描述 |
|---|---|
| AD9875-EB | Broadband Modem Mixed-Signal Front End |
| AD9875BST | Broadband Modem Mixed-Signal Front End |
| AD9876 | Broadband Modem Mixed-Signal Front End |
| AD9876-EB | Broadband Modem Mixed-Signal Front End |
| AD9876BST | Broadband Modem Mixed-Signal Front End |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9875BST | 制造商:Analog Devices 功能描述:Modem Chip Single 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:10B BROADBAND MODEM MXFE CONVERTER - Tape and Reel |
| AD9875BSTRL | 制造商:Analog Devices 功能描述:Modem Chip Single 48-Pin LQFP T/R |
| AD9875BSTZ | 制造商:Analog Devices 功能描述:Modem Chip Single 48-Pin LQFP |
| AD9875-EB | 制造商:Analog Devices 功能描述: |
| AD9876 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Broadband Modem Mixed-Signal Front End |
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