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參數(shù)資料
| 型號： | AL1201 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | stereo DAC |
| 中文描述： | 立體聲DAC |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 134K |
| 代理商： | AL1201 |
Alesis Semiconductor
12555 J efferson Blvd., Suite 285
Los Angeles, CA 90066
Fax (310) 306-1551
- 7 -
DS1201-0702
Phone (310) 301-0780
www.alesis-semi.com
Differential to Single-ended Converter and 2-pole 48kHz lowpass filter
Differential Analog Outputs
The AL1201 outputs are self-biased to MID
potential. Maximum differential output
signal level is +/ -4V. The outputs have been
internally filtered to reduce out-of-band
noise, and further filtering is suggested
where this is considered critical. The
differential-to-single-ended filter shown
is a two-pole 48kHz lowpass filter whose
frequency response is flat from dc to 20kHz
+/ -.03dB. Its group delay deviation from flat
is 1.3
μ
s at 20kHz. High quality ceramic or
film capacitors suggested.
+
+
-
8.2k
IN-
10
μ
IN+
8.2k
+
1000p
8.2k
1.8k
1.8k
390p
8.2k
390p
Out
10
μ
MID
4Vpp
4Vpp
MID
8Vpp
GND
GND
GND
Reference and Mid
The differential potential between the REF+
and REF- pins (connected to VA and GND
respectively) determines the amount of
charge that is added to or removed from the
switched-capacitor filter input for each
-
Σ
modulator output (128Fs). It is very
important that REF+ is well bypassed to
REF- (.1
μ
F ceramic as close as possible to
pins) to remove the unwanted effects of high
frequency noise.
The MID potential is developed on chip
(VA/ 2 volts) and is used to bias the internal
amplifiers in the switched-capacitor and
continuous-time filters. It requires a .1
μ
F
bypass to GND at the pin. No load current
should be taken from the MID pin.
Power Supplies and Ground
A single low-impedance 5V supply is all that
is required to achieve specified performance.
A 5V supply plane is recommended if
possible. VA and VD can be directly
connected to 5V, and REF+ should be
isolated with a 220-ohm resistor to 5V.
A single low impedance ground plane can be
used for all GND connections, simplifying
PCB layout. Each supply pin should be
bypassed to GND with a .1
μ
F ceramic cap
positioned as close to the pin as possible.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AL128 | Circular Connector; No. of Contacts:55; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| AL1402 | Circular Connector; No. of Contacts:100; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| AL251 | Video Scan Doubler |
| AL3201 | Circular Connector; No. of Contacts:19; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-19 |
| AL440B | Circular Connector; No. of Contacts:128; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:24; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
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參數(shù)描述 |
|---|---|
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