參數(shù)資料
型號(hào)： LTC1667
廠商： Linear Technology Corporation
英文描述： 12-Bit, 14-Bit, 16-Bit, 50Msps DACs
中文描述： 12位，14位，16位，50 MSPS的數(shù)模轉(zhuǎn)換器
文件頁(yè)數(shù)： 12/24頁(yè)
文件大?。?/td> 888K
代理商： LTC1667
12
LTC1666/LTC1667/LTC1668
Adjusting the Full-Scale Output
In Figure 2, a serial interfaced DAC is used to set I
OUTFS
.
The LTC1661 is a dual 10-bit V
OUT
DAC with a buffered
voltage output that swings from 0V to V
REF
.
DAC Transfer Function
The LTC1666/LTC1667/LTC1668 use straight binary digital
coding. The complementary current outputs, I
OUT A
and I
OUT
B
, sink current from 0 to I
OUTFS
. For I
OUTFS
= 10mA (nomi-
nal), I
OUT A
swings from 0mA when all bits are low (e.g.,
Code= 0) to 10mA when all bits are high (e.g., Code = 65535
for LTC1668) (decimal representation). I
OUT B
is comple-
mentary to I
OUT A
. I
OUT A
and I
OUT B
are given by the following
formulas:
LTC1666:
I
OUT A
= I
OUTFS
(DAC Code/4096)
I
OUT B
= I
OUTFS
(4095 – DAC Code)/4096
LTC1667:
I
OUT A
= I
OUTFS
(DAC Code/16384)
I
OUT B
= I
OUTFS
(16383 – DAC Code)/16384
LTC1668:
I
OUT A
= I
OUTFS
(DAC Code/65536)
I
OUT B
= I
OUTFS
(65535 – DAC Code)/65536
In typical applications, the LTC1666/LTC1667/LTC1668
differential output currents either drive a resistive load
directly or drive an equivalent resistive load through a
transformer, or as the feedback resistor of an I-to-V
converter. The voltage outputs generated by the I
OUT A
and
I
OUT B
output currents are then:
(2)
(3)
(4)
(5)
(6)
(7)
Figure 2. Adjusting the Full-Scale Current of
the LTC1666/LTC1667/LTC1668 with a DAC
APPLICATIOU
W
U
U
V
OUT A
= I
OUT A
R
LOAD
V
OUT B
= I
OUT B
R
LOAD
The differential voltage is:
V
DIFF
= V
OUT A
– V
OUT B
= (I
OUT A
– I
OUT B
) (R
LOAD
)
Substituting the values found earlier for I
OUT A
, I
OUT B
and
I
OUTFS
(LTC1668):
V
DIFF
= {2 DAC Code – 65535)/65536} 8
(R
LOAD
/R
SET
) (V
REF
)
From these equations some of the advantages of differen-
tial mode operation can be seen. First, any common mode
noise or error on I
OUT A
and I
OUT B
is cancelled. Second, the
signal power is twice as large as in the single-ended case.
Third, any errors and noise that multiply times I
OUT A
and
I
OUT B
, such as reference or I
OUTFS
noise, cancel near
midscale, where AC signal waveforms tend to spend the
most time. Fourth, this transfer function is bipolar; e.g. the
output swings positive and negative around a zero output
at mid-scale input, which is more convenient for AC
applications.
Note that the term (R
LOAD
/R
SET
) appears in both the
differential and single-ended transfer functions. This means
that the Gain Error of the DAC depends on the ratio of
R
LOAD
to R
SET
, and the Gain Error tempco is affected by the
temperature tracking of R
LOAD
with R
SET
. Note also that
the absolute tempco of R
LOAD
is very critical for DC
nonlinearity. As the DAC output changes from 0mA to
10mA the R
LOAD
resistor will heat up slightly, and even a
very low tempco can produce enough INL bowing to be
significant at the 16-bit level. This effect disappears with
medium to high frequency AC signals due to the slow
thermal time constant of the load resistor.
(8)
(9)
(10)
(11)
Analog Outputs
The LTC1666/LTC1667/LTC1668 have two complemen-
tary current outputs, I
OUT A
and I
OUT B
(see DAC Transfer
Function). The output impedance of I
OUT A
and I
OUT B
(R
IOUT A
and R
IOUT B
) is typically 1.1k
to LADCOM. (See
Figure 3.)
+
–
I
REFIN
2.5V
REFERENCE
R
1.9k
REF
0.1
μ
F
1/2 LTC1661
5V
1666/7/8
F03
LTC1666/
LTC1667/
LTC1668
相關(guān)PDF資料
PDF描述
LTC1667CG 12-Bit, 14-Bit, 16-Bit, 50Msps DACs
LTC1667IG 12-Bit, 14-Bit, 16-Bit, 50Msps DACs
LTC1760 Dual Smart Battery System Manager
LTC1760CFW Dual Smart Battery System Manager
LTC2286 Dual 10-Bit, 65/40/25Msps Low Noise 3V ADCs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1667CG 功能描述:IC D/A CONV 14BIT 50MSPS 28-SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
LTC1667CG#PBF 功能描述:IC D/A CONV 14BIT 50MSPS 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
LTC1667CG#TR 功能描述:IC D/A CONV 14BIT 50MSPS 28-SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
LTC1667CG#TRPBF 功能描述:IC D/A CONV 14BIT 50MSPS 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
LTC1667IG 功能描述:IC D/A CONV 14BIT 50MSPS 28-SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*