參數(shù)資料
型號(hào)： EVAL-AD1937EB
廠商： Analog Devices, Inc.
元件分類： Codec
英文描述： 4 ADC/8 DAC with PLL, 192 kHz, 24 Bit CODEC
中文描述： 4模數(shù)轉(zhuǎn)換器/ 8鎖相環(huán)，192千赫，24位編解碼器數(shù)模轉(zhuǎn)換器
文件頁(yè)數(shù)： 11/30頁(yè)
文件大小： 376K
代理商： EVAL-AD1937EB
Preliminary Technical Data
AD1935/AD1936/AD1937/AD1938/AD1939
Rev. Pr
I
| Page 11 of 30
R/
W
0
SCK
SDA
0
0
0
1
AD1
AD0
0
0
0
0
0
1
1
0
ACK. BY
AD193X
START BY
MASTER
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
AD193X
STOP BY
MASTER
SCK
(CONTINUED)
SDA
(CONTINUED)
FRAME 1
CHIP ADDRESS BYTE
FRAME 3
DATA BYTE TO
AD193X
FRAME 2
REGISTER ADDRESS BYTE
ACK. BY
AD193X
8
Figure 11. Format of I
2
C Write
R/
W
0
SCL
SDA
0
0
0
1
AD1
AD0
0
0
0
0
0
1
1
0
ACK. BY
AD193X
START BY
MASTER
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
AD193X
STOP BY
MASTER
FRAME 1
CHIP ADDRESS BYTE
FRAME 2
REGISTER ADDRESS BYTE
ACK. BY
AD193X
R/
W
0
SCL
(Continued)
SDA
(Continued)
0
0
0
1
AD1
AD0
REPEATED START
BY MASTER
FRAME 3
CHIP ADDRESS BYTE
FRAME 4
REGISTER DATA
ACK. BY
AD193X
8
Figure 12. Format of I
2
C Read
Power Supply and Voltage Reference
The AD193X is designed for 3.3 V supplies. Separate power supply
pins are provided for the analog and digital sections. These pins
should be bypassed with 100 nF ceramic chip capacitors, as close to
the pins as possible, to minimize noise pickup. A bulk aluminum
electrolytic capacitor of at least 22
μ
F should also be provided on
the same PC board as the codec. For critical applications, improved
performance will be obtained with separate supplies for the analog
and digital sections. If this is not possible, it is recommended that
the analog and digital supplies be isolated by means of a ferrite
bead in series with each supply. It is important that the analog
supply be as clean as possible.
The AD1935 (64-pin single-ended version), and the AD1939 and
AD1937 (64-pin differential versions) include a 3.3V regulator
driver which requires only an external pass transistor and bypass
capacitors to make a 5V to 3.3V regulator. If the regulator driver is
not used, VSUPPLY, VDRIVE, and VSENSE should be connected to
DGND.
All digital inputs are compatible with TTL and CMOS levels. All
outputs are driven from the 3.3 V DVDD supply and are
compatible with TTL and 3.3 V CMOS levels.
The ADC and DAC internal voltage reference V
REF
is brought out
on FILTR and should be bypassed as close as possible to the chip,
with a parallel combination of 10
μ
F and 100 nF. Any external
current drawn should be limited to less than 50
μ
A.
The internal reference can be disabled in PLL and Clock Control
Register 1 and FILTR driven from an external source. This can be
used to scale the DAC output to a power amplifier's clipping level
based on its power supply voltage. The ADC input gain will also
vary by the inverse ratio. The total gain from ADC input to DAC
output will stay constant.
The CM pin is the internal common-mode reference. It should be
bypassed as close as possible to the chip, with a parallel
combination of 10
μ
F and 100 nF. This voltage may be used to bias
external op amps to the common-mode voltage of the input and
output signal pins. The output current should be limited to less
than 0.5 mA source and 2 mA sink.
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相關(guān)代理商/技術(shù)參數(shù)
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EVAL-AD1938EB 制造商:AD 制造商全稱:Analog Devices 功能描述:4 ADC/8 DAC with PLL, 192 kHz, 24-Bit CODEC
EVAL-AD1938EBZ 制造商:Analog Devices 功能描述:EVAL BD FOR MULTI CHANNEL 96KHZ CODEC - Boxed Product (Development Kits)
EVAL-AD1939AZ 功能描述:BOARD EVAL FOR AD1939 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板
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