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參數(shù)資料
| 型號(hào)： | DAC2900-EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DAC2900 10-bit, 125MSPS DC EVM(DAC2900 10位, 125MSPS DC 評(píng)估板) |
| 中文描述： | DAC2900 10位，125Msps區(qū)的EVM（DAC2900 10位，125MSPS直流評(píng)估板） |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 444K |
| 代理商： | DAC2900-EVM |
DAC290x-EVM
SBAU071
2
INITIAL CONFIGURATION
By using jumpers and 0
resistors, the DAC290x-EVM can
be set up in a variety of configurations to accommodate a
specific mode of operation. Before starting evaluation, the
user should decide on the configuration and make the appro-
priate connections or changes. The demonstration board
comes with the following factory-set configuration:
Single clock source driving CLK_1, WRT_1, CLK_2, and
WRT_2 from WRT_1 input J5. W10, R21, R32-R37, and
J6-J8 not installed.
Transformer coupled outputs (1:1) using transformer T1
and T2. R43-R46, C12, C13, C22, and C23 not installed.
Note that a dc-bias voltage is set at the center tap.
The converter is set to operate with the internal reference.
Jumper W1 is not installed.
The full-scale output current of both DACs is set to 20mA
through the FSA resistors R15 and R16 (2k
each). Jumper
W2 is installed connecting pin 42 (GSET) to ground.
The DAC290x output is enabled (power-down mode dis-
abled). Jumper W6 is installed connecting pin 37 (PD) to
ground.
POWER SUPPLY
The DAC290x converter requires two power supplies—an
analog and a digital supply. Each of the supplies may be set
independently between +3.0V and +5.0V. The analog sup-
ply, +VA, must be connected at banana jack J9 with the
return going to banana jack J10. The digital supply, +VD,
connects at banana jack J11 with the return connected to J12.
When operating the DAC290x with a +3.0V digital supply,
care must be taken that the amplitude of the digital data
inputs has a corresponding logic level. The logic high level
must not exceed the power supply by more than 0.3V. Refer
to the product data sheets (DAC2900—SBAS166;
DAC2902—SBAS167; DAC2904—SBAS198) for further
details.
All analog and digital power, and grounds are distributed by
the use of power planes.
INPUT CLOCK
The DAC290x-EVM default configuration requires only
one clock input. The clock should be applied via SMA
connector WRT_1 ( J5), which provides a 50
terminated
input. It is recommended to use a square wave clock with an
amplitude of
≥
3.0Vp-p. In order to preserve the specified
performance of the DAC290x converter, the clock source
should feature very low jitter.
MULTIPLE INPUT CLOCKS
The DAC290x-EVM evaluation board can be configured for
multiple input clocks, each driving a CLK or WRT input pin.
This mode would require the user to install J6, J7, J8, R32
thru R37, and removal of R22 thru R25.
INTERNAL REFERENCE OPERATION
The full-scale output current is set by applying an external
resistor (R15 and R16) between the FAS1 and FAS2 pins of
the DAC290x and ground. The full-scale output current can
be adjusted from 20mA down to 2mA by varying R15 and
R16 or changing the externally applied reference voltage.
The full-scale output current, IOUT
FS
, is defined as follows:
IOUT
FS
= 32 (V
REF_IN
/R
BIAS
)
where V
REF_IN
is the voltage at pin REF_IN and R
BIAS
is the
resistance of R15 (for DAC1) or R16 (for DAC2). This
voltage is typically +1.25V when using the internally pro-
vided reference voltage source. Two potentiometers (R40
and R41) are provided to allow the user to adjust the center
voltage of the DAC outputs across transformers T1 and T2.
The EVM initial setup is for full-scale output current opera-
tion, with the potentiometers adjusted to provide 0.5V at the
center tap of the transformers.
EXTERNAL REFERENCE OPERATION
The internal reference can be disabled and overridden by an
external reference. Two methods of external reference are
provided by the EVM. The user can provide an external
reference by connecting a voltage source to SMA connector
J13 with Jumper W1 installed between pins 2 and 3. In
addition, a reference circuit has been included on the EVM
to provide a second external reference source. This source is
available by placing Jumper W1 between pins 1 and 2 and
adjusting potentiometer R7 to the desired voltage. The range
of this circuit is from 0V to 1.25V. The specified range for
external reference voltages should never exceed the limits as
specified per the data sheet.
POWER-DOWN MODE
The DAC290x-EVM provides a means of placing the
DAC290x converter into a power-down mode. This mode is
activated by re-configuring Jumper W6 so that it connects
the PD-pin (pin37) to +VD.
INPUT DATA
The DAC290x-EVM allows the user to input I and Q digital
data to the DAC using J1 and J2. The board provides series
dampening 22
resistors and buffering to minimize digital
ringing and switching noise. The connectors also provide a
path for an input clock. With the EVM set up in the single
clock source mode, the user can provide a clock through J1
or J2 by installing jumper W10 and resistor R21. The 14-bit
input data buses are brought in through two 34 pin headers
as shown in Tables I and II.
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相關(guān)代理商/技術(shù)參數(shù) |
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| DAC2900Y/1K | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Dual 10-Bit 125Msps RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC2900Y/1KG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Dual 10-Bit 125Msps RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC2900Y/250 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Dual 10-Bit 125Msps RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC2900Y/250G4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Dual 10-Bit 125Msps RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC2902 | 制造商:BB 制造商全稱:BB 功能描述:Dual, 12-Bit, 125MSPS DIGITAL-TO-ANALOG CONVERTER |
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