- 您現在的位置：買賣IC網 > PDF目錄376561 > DAC7741YB 16-Bit, Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface PDF資料下載
參數資料
| 型號： | DAC7741YB |
| 元件分類： | DAC |
| 英文描述： | 16-Bit, Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface |
| 中文描述： | 16位具有內部參考和并行接口的單通道數字到模擬轉換器 |
| 文件頁數： | 14/20頁 |
| 文件大?。?/td> | 421K |
| 代理商： | DAC7741YB |
DAC7741
SBAS248A
14
www.ti.com
ANALOG OUTPUTS
The output amplifier can swing to within 1.4V of the supply
rails, specified over the
–
40
°
C to +85
°
C temperature range.
This allows for a
±
10V DAC voltage output operation from
±
12V supplies with a typical 5% tolerance.
When the DAC7741 is configured for a unipolar, 0V to 10V
output, a negative voltage supply is required. This is due to
internal biasing of the output stage. Please refer to the
“
Electrical Characteristics
”
table for more information.
The minimum and maximum voltage output values are de-
pendent upon the output configuration implemented and
reference voltage applied to the DAC7741. Please note that
V
SS
(the negative power supply) must be in the range of
–
4.75V to
–
15.75V for unipolar operation. The voltage on V
SS
sets several bias points within the converter and is required
in all modes of operation. If V
SS
is not in one of these two
configurations, the bias values may be in error and proper
operation of the device is not ensured.
Supply sequence is important in establishing the correct
startup of the DAC. The digital supply (V
DD
) needs to estab-
lish correct bias conditions before the analog supplies (V
CC
,
V
SS
) are brought up. If the digital supply cannot be brought
up first, it must come up before either analog supply (V
CC
or
V
SS
), with the preferred sequence of: V
SS
(device substrate),
V
DD
then V
CC
.
REFERENCE INPUTS
The DAC7741 provides a built-in +10V voltage reference and
on-chip buffer to allow external component reference drive. To
use the internal reference, REFEN must be LOW, enabling the
reference circuitry of the DAC7741 (see Table I) and the
REF
OUT
pin must be connected to REF
IN
. This is the input to
the on-chip reference buffer. The buffers output is provided at
REFEN
ACTION
1
Internal Reference disabled;
REF
OUT
= HIGH Impedance
Internal Reference enabled;
REF
OUT
= +10V
0
TABLE I. REFEN Action.
TABLE II. DAC7741 Logic Truth Table.
the V
REF
pin. In this configuration, V
REF
is used to setup the
DAC7741 output amplifier into one of three voltage output
modes as discussed earlier. V
REF
can also be used to drive
other system components requiring an external reference.
The internal reference of the DAC7741 can be disabled when
use of an external reference is desired. When using an
external reference, the reference input, REF
IN
, can be any
voltage between 4.75V (or V
SS
+ 14V, whichever is greater)
and V
CC
–
1.4V.
DIGITAL INTERFACE
Table III shows the data format for the DAC7741 and
Table II illustrates the basic control logic of the device. The
interface consists of a chip select input (CS), read/write
control input (R/W), data inputs (DB0-DB15) and a load DAC
input (LDAC). An asynchronous reset input (RST) which is
active low, is provided to simplify start-up conditions, periodic
resets, or emergency resets to a known state, depending on
the status of the reset select (RSTSEL) signal. The DAC
code is provided via a 16-bit parallel interface, as shown in
Table II. The input word makes up the DAC code to be
loaded into the data input register of the device. The data is
latched into the input register on rising CS and is loaded into
the DAC register upon reception of a rising edge on the
LDAC input. This action updates the analog output, V
OUT
, to
the desired value. LDAC inputs of multiple DAC7741 devices
can be connected when a synchronized update of numerous
DAC outputs is desired. Please refer to the timing section for
more detailed data I/O information.
CONTROL STATUS
RST
RSTSEL
H
H
COMMAND
R/W
L
X
CS
L
H
LDAC
H, L,
↓
↑
Input Register
Write
Hold
DAC Register
Hold
Write
Mode
X
X
Write Data to Input Register
Update DAC register with data from input
register.
Write DAC register directly from data bus
Read data in input register.
No Change
L
H
X
X
L
L
H
X
H
H
H
L
X
X
X
L
↑
Transparent
Read
Hold
Reset to Min-Scale Reset to Min-Scale
Reset to Input and DAC Register (0000
H
)
Min-
Scale
Reset to Mid-Scale Reset to Mid-Scale
Reset to Input and DAC Register (8000
H
)
Mid-Scale
Write
Hold
Hold
H, L,
↓
H, L,
↓
X
X
X
L
H
X
ANALOG OUTPUT
TABLE III. DAC7741 Data Format.
DIGITAL INPUT
Unipolar Configuration
Bipolar Configuration
Unipolar Straight Binary
Zero (0V)
Zero + 1LSB
:
1/2 Full-Scale
1/2 Full-Scale + 1LSB
:
Full-Scale (V
REF
–
1LSB)
Bipolar Offset Binary
–
Full-Scale (
–
V
REF
or
–
V
REF
/2)
–
Full-Scale + 1LSB
:
Bipolar Zero
Bipolar Zero + 1LSB
:
+Full-Scale (+V
REF
–
1LSB
or +V
REF
/2
–
1LSB)
0x0000
0x0001
:
0x8000
0x8001
:
0xFFFF
相關PDF資料 |
PDF描述 |
|---|---|
| DAC7741YC | 16-Bit, Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface |
| DAC7741YL | 16-Bit, Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface |
| DAC7741 | Single Supply RS232C Line Driver/Receiver |
| DAC7741Y | 16-Bit, Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface |
| DAC7744 | 16-Bit, Quad Voltage Output DIGITAL-TO-ANALOG CONVERTER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DAC7741YB/250 | 功能描述:數模轉換器- DAC 16-Bit Sng Ch W/Int +10V Ref & Para I/F RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 |
| DAC7741YB/250G4 | 功能描述:數模轉換器- DAC 16-Bit Sng Ch W/Int +10V Ref & Para I/F RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 |
| DAC7741YB/2K | 功能描述:數模轉換器- DAC 16-Bit Sng Ch W/Int +10V Ref & Para I/F RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 |
| DAC7741YB/2KG4 | 功能描述:數模轉換器- DAC 16-Bit Sng Ch W/Int +10V Ref & Para I/F RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 |
| DAC7741YC | 制造商:Texas Instruments 功能描述:DAC,16Bit, Voltage Output DAC, DAC7741YC |
發(fā)布緊急采購，3分鐘左右您將得到回復。