參數(shù)資料
型號(hào)： DAC8820IC
廠商： Texas Instruments, Inc.
英文描述： 16-Bit, Parallel Input Multiplying Digital-to-Analog Converter
中文描述： 16位并行輸入乘法數(shù)字到模擬轉(zhuǎn)換器
文件頁(yè)數(shù)： 15/22頁(yè)
文件大?。?/td> 939K
代理商： DAC8820IC
www.ti.com
V
OUT
D
32,768
1
V
REF
(2)
R2
R1
DAC
Parallel Bus
Input
Register
Control
Logic
DAC
Register
D15
WR
D0
RST
LDAC
REF
R
COM
R1
R
FB
R
OFS
R
FB
R
OFS
V
DD
I
OUT
AGND
DGND
DAC8820
OPA2277
V
REF
U1
OPA2277
V
OUT
C1
U2
Programmable Current Source Circuit
A DAC8820 can be integrated into the circuit in
Figure 43
to implement an improved Howland current pump for
precise V/I conversions. Bidirectional current flow and high-voltage compliance are two features of the circuit.
With a matched resistor network, the load current of the circuit is shown by
Equation 3
:
I
L
R2
R3
R3
R1
V
REF
D
(3)
Z
O
R1 R3 R1
R3
R2
R1 R2
R1 R2
R3
(4)
DAC8820
SBAS358C–AUGUST 2005–REVISED JUNE 2006
APPLICATION INFORMATION (continued)
Figure 42. Bipolar Output Circuit
The value of R3 in the previous equation can be reduced to increase the output current drive of U3. U3 can
drive
±
20 mA in both directions with voltage compliance limited up to 15 V by the U3 voltage supply. Elimination
of the circuit compensation capacitor (C1) in the circuit is not suggested as a result of the change in the output
impedance (Z
O
), according to
Equation 4
:
As shown in
Equation 4
, Z
O
with matched resistors is infinite and the circuit is optimum for use as a current
source. However, if unmatched resistors are used, Z
O
is positive or negative with negative output impedance
being a potential cause of oscillation. Therefore, by incorporating C1 into the circuit, possible oscillation
problems are eliminated. The value of C1 can be determined for critical applications; for most applications,
however, a value of several pF is suggested.
15
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DAC8820ICDBG4 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp 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
DAC8820ICDBR 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp 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
DAC8820ICDBRG4 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp 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
DAC8822 制造商:BB 制造商全稱:BB 功能描述:16-Bit, Dual, Parallel Input, Multiplying Digital-to-Analog Converter
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