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參數(shù)資料
| 型號(hào)： | DAC8043 |
| 英文描述： | CMOS 12-Bit Serial Input Multiplying DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 的CMOS 12位串行輸入乘法數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 189K |
| 代理商： | DAC8043 |
DAC8043
–7–
REV. C
DYNAMIC PE RFORMANCE
OUT PUT IMPE DANCE
T he DAC8043’s output resistance, as in the case of the output
capacitance, varies with the digital input code. T his resistance,
looking back into the I
OUT
terminal, may be between 10 k
(the
feedback resistor alone when all digital inputs are LOW) and
7.5 k
(the feedback resistor in parallel with approximate 30 k
of the R-2R ladder network resistance when any single bit logic
is HIGH). Static accuracy and dynamic performance will be af-
fected by these variations.
T his variation is best illustrated by using the circuit of Figure 4
and the equation:
V
ERROR
=
V
OS
1
+
R
FB
R
O
where
R
O
is a function of the digital code, and:
R
O
= 10 k
for more than four bits of logic 1.
R
O
= 30 k
for any single bit of logic 1.
T herefore, the offset gain varies as follows:
at code 0011 1111 1111,
V
ERROR
1
=
V
OS
1
+
10
k
10
k
= 2
V
OS
at code 0100 0000 0000,
V
ERROR
2
=
V
OS
1
+
10
k
30
k
= 4/3
V
OS
T he error difference is 2/3 V
OS
.
Since one LSB has a weight (for V
REF
= +10 V) of 2.4 mV for
the DAC8043, it is clearly important that V
OS
be minimized,
either using the amplifier’s nulling pins, an external nulling net-
work, or by selection of an amplifier with inherently low V
OS
.
Amplifiers with sufficiently low V
OS
include ADI’s OP77, OP07,
OP27, and OP42.
Figure 4. Simplified Circuit
T o further insure accuracy across the full temperature range,
permanently “ON” MOS switches were included in series with
the feedback resistor and the R-2R ladder’s terminating resistor.
T he “Simplified DAC Circuit,” Figure 2, shows the location of
the series switches. T hese series switches are equivalently scaled
to two times switch 1 (MSB) and to switch 12 (LSB) respec-
tively to maintain constant relative voltage drops with varying
temperature. During any testing of the resistor ladder or
R
FEEDBACK
(such as incoming inspection), V
DD
must be present
to turn “ON” these series switches.
Figure 2. Simplified DAC Circuit
E QUIVALE NT CIRCUIT ANALY SIS
Figure 3 shows an equivalent analog circuit for the DAC8043.
T he (D
×
V
REF
)/R current source is code dependent and is the
current generated by the DAC. T he current source I
LK G
consists
of surface and junction leakages and doubles approximately ev-
ery 10
°
C. C
OUT
is the output capacitance; it is the result of the
N-channel MOS switches and varies from 80 pF to 110 pF
depending on the digital input code. R
O
is the equivalent output
resistance that also varies with digital input code. R is the nomi-
nal R-2R resistor ladder resistance.
Figure 3. Equivalent Analog Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DAC8043U | CMOS 12-Bit Serial Input Multiplying DIGITAL-TO-ANALOG CONVERTER |
| DAC8043AZ | 12-Bit Serial Input Multiplying CMOS D/A Converter |
| DAC8043EZ | 12-Bit Serial Input Multiplying CMOS D/A Converter |
| DAC8043FP | 12-Bit Serial Input Multiplying CMOS D/A Converter |
| DAC8043FS | 12-Bit Serial Input Multiplying CMOS D/A Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC8043A | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit Serial Input Multiplying D/A Converter |
| DAC8043A1ES | 功能描述:IC DAC 12BIT MULT SRL INP 8-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,400 系列:- 設(shè)置時(shí)間:- 位數(shù):18 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:3 電壓電源:模擬和數(shù)字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應(yīng)商設(shè)備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數(shù)目和類型:* 采樣率（每秒）:* |
| DAC8043A1ES2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit Serial Input Multiplying D/A Converter |
| DAC8043A1ESZ | 功能描述:IC DAC 12BIT MULT SRL INP 8SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:47 系列:- 設(shè)置時(shí)間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:* |
| DAC8043A1ESZ23 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit Serial Input Multiplying D/A Converter |
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