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參數(shù)資料
| 型號： | DAC2932PFBT |
| 元件分類： | DAC |
| 英文描述： | DUAL 12-BIT 40MSPS DIGITAL TO ANALOG CONVERTER |
| 中文描述： | 雙通道12位40MSPS數(shù)模轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 343K |
| 代理商： | DAC2932PFBT |
SBAS279C AUGUST 2003 REVISED OCTOBER 2004
www.ti.com
14
APPLICATION INFORMATION
THEORY OF OPERATION
The architecture of the DAC2932 uses the current steering
technique to enable fast switching and a high update rate.
The core element within the monolithic DAC is an array of
segmented current sources that are designed to deliver a
full-scale output current of up to 2mA, as shown in
Figure 27. An internal decoder addresses the differential
current switches each time the DAC is updated and a
corresponding output current is formed by steering all
currents to either output summing node, I
OUT
or I
OUT
. The
complementary outputs deliver a differential output signal,
which improves the dynamic performance through
reduction of even-order harmonics and common-mode
signals (noise), and doubles the peak-to-peak output
signal swing by a factor of two, compared to single-ended
operation.
The segmented architecture results in a significant
reduction of the glitch energy, and improves the dynamic
performance (SFDR) and DNL. The current outputs
maintain a very high output impedance of greater than
200k
.
The full-scale output current is determined by the ratio of
the internal reference voltage (approximately +1.2V) and
an external resistor, R
SET
. The resulting I
REF
is internally
multiplied by a factor of 32 to produce an effective DAC
output current that can range from 0.5mA to 2mA,
depending on the value of R
SET
.
The DAC2932 is split into a digital and an analog portion,
each of which is powered through its own supply pin. The
digital section includes edge-triggered input latches and
the decoder logic, while the analog section comprises the
current source array with its associated switches, and the
reference circuitry.
STBY
CS
DIN
SCLK
SYNC
PD
CLK
Parallel Data Input,
[D0:D11]
12Bit Data,
Interleaved
DAC2932
REF
IN
+V
D
+V
A
GSET
FSA1
FSA2
AGND
DGND
I
OUT1
I
OUT1
I
OUT2
I
OUT2
V
OUT1
V
OUT2
V
OUT3
V
OUT4
+1.22V Reference
Latch
S
S
I
a
D
Reference Control Amp
12Bit
40MSPS
IDAC1
DAC
Latch 1
12Bit
40MSPS
IDAC2
12Bit
StringDAC1
Latch
12Bit
StringDAC2
Latch
12Bit
StringDAC3
Latch
12Bit
StringDAC4
DAC
Latch 2
Data2
CLK2
Clock
IDAC Section
A0
A
A
A
A
Dx
12
A1
A2
A3
REFV
+V
DV
+V
AV
AGNDV
DGNDV
PDV
VDAC Section
Data1
CLK1
Figure 27. Block Diagram of the DAC2932
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DAC312BR | 12-Bit Digital-to-Analog Converter |
| DAC312GBC | 12-Bit Digital-to-Analog Converter |
| DAC312FR | 12-Bit High Speed Multiplying D/A Converter |
| DAC312HP | 12-Bit High Speed Multiplying D/A Converter |
| DAC312HS | 12-Bit High Speed Multiplying D/A Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC2932PFBTG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Dual 12-Bit 40MSPS 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)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC-2-CG | 制造商:Thomas & Betts 功能描述: |
| DAC2K5G4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-Bit, Low-Power Digital-to-Analog Converter |
| DAC2KY | 制造商:BB 制造商全稱:BB 功能描述:Dual, 12-Bit, 125MSPS DIGITAL-TO-ANALOG CONVERTER |
| DAC312 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit High Speed Multiplying D/A Converter |
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