參數(shù)資料
型號： DAC2932
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)： 19/24頁
文件大小： 343K
代理商： DAC2932
SBAS279C AUGUST 2003 REVISED OCTOBER 2004
www.ti.com
19
Figure 34 shows an example of a dc-coupled interface
with dc level-shifting, using a precision resistor network.
An ac-coupled interface, as shown in Figure 35, has the
advantage in that the common-mode levels at the input of
the modulator can be set independently of those at the
output of the DAC. Furthermore, no voltage loss occurs in
this setup.
I
OUT
1
I
OUT
1
DAC2932
I
OUT
1
I
OUT
1
V
OUT
1
V
DC
R
3
R
4
R
5
V
OUT
1
Figure 34. DC-Coupled Interface to a Quadrature
Modulator Applying Level Shifting
I
OUT
1
I
OUT
1
DAC2932
I
OUT
1
I
OUT
1
V
OUT
1
0.01
μ
F
0.01
μ
F
V
DC
R
1
R
2
V
OUT
1
R
250
R
LOAD
250
Figure 35. AC-Coupled Interface to a Quadrature
Modulator Applying Level Shifting
INTERNAL REFERENCE OPERATION
The DAC2932 has an on-chip reference circuit that
comprises a 1.22V bandgap reference and two control
amplifiers, one for each DAC. The full-scale output current,
I
OUTFS
, of the DAC2932 is determined by the reference
voltage, V
REF
, and the value of resistor R
SET
. I
OUTFS
can
be calculated by:
I
OUTFS
32
I
REF
32
V
REF
R
SET
The external resistor R
SET
connects to the FSA pin
(full-scale adjust) as shown in Figure 36. The reference
control amplifier operates as a V-to-I converter producing
a reference current, I
REF
, which is determined by the ratio
of V
REF
and R
SET,
as shown in Equation 10. The full-scale
output current, I
OUTFS
, results from multiplying I
REF
by a
fixed factor of 32.
DAC2932
+1.22V Ref.
R
19.6k
0.1
μ
F
FSA
+3V
+V
A
REF
IN
Current
Sources
I
REF
=V
REF
R
SET
Ref
Control
Amp
Figure 36. Internal Reference Configuration
Using the internal reference, a 19.6k
resistor value
results in a full-scale output of approximately 2mA.
Resistors with a tolerance of 1% or better should be
considered. Selecting higher values, the output current
can be adjusted from 2mA down to 0.5mA. Operating the
DAC2932 at lower than 2mA output currents may be
desirable for reasons of reducing the total power
consumption or observing the output compliance voltage
limitations for a given load condition.
It is recommended to bypass the REF
IN
pin with a ceramic
chip capacitor of 0.1
μ
F or more. The control amplifier is
internally compensated, and its small signal bandwidth is
approximately 0.1MHz.
GAIN SETTING OPTIONS
The full-scale output current on the DAC2932 can be set
two ways: either for each of the two DAC channels
independently or for both channels simultaneously. For the
independent gain set mode, GSET (pin 19) must be high
(that is, connected to +V
A
). In this mode, two external
resistors are required—one R
SET
connected to the FSA1
pin (pin 24) and the other to the FSA2 pin (pin 23). In this
configuration, the user has the flexibility to set and adjust
the full-scale output current for each DAC independently,
allowing for the compensation of possible gain
mismatches elsewhere within the transmit signal path.
(10)
相關(guān)PDF資料
PDF描述
DAC2932PFBR DUAL 12-BIT 40MSPS DIGITAL TO ANALOG CONVERTER
DAC2932PFBT DUAL 12-BIT 40MSPS DIGITAL TO ANALOG CONVERTER
DAC312BR 12-Bit Digital-to-Analog Converter
DAC312GBC 12-Bit Digital-to-Analog Converter
DAC312FR 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
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DAC2932PFBRG4 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC2932PFBT 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
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