- 您现在的位置：买卖IC网 > PDF目录39424 > LTC2641IS8-16#TRPBF (LINEAR TECHNOLOGY CORP) 16-BIT DAC, PDSO8 PDF资料下载
参数资料
| 型号： | LTC2641IS8-16#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | DAC |
| 英文描述： | 16-BIT DAC, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 8/24页 |
| 文件大小： | 334K |
| 代理商： | LTC2641IS8-16#TRPBF |
LTC2641/LTC2642
16
26412fb
APPLICATIONS INFORMATION
such as the LTC6078 is suitable, if the application does
not require linear operation very near to GND, or zero scale
(Figure 2). The LTC6078 typically swings to within 1mV of
GND if it is not required to sink any load current. For an
LSB size of 38μV, 1mV represents 26 missing codes near
zero scale. Linearity will be degraded over a somewhat
larger range of codes above GND. It is also unavoidable
that settling time and transient performance will degrade
whenever a single supply amplier is operated very close
to GND, or to the positive supply rail.
The small LSB size of a 16-bit DAC, coupled with the tight
accuracy specications on the LTC2641/LTC2642, means
that the accuracy and input specications for the external
op amp are critical for overall DAC performance.
Op Amp Specications and Unipolar DAC Accuracy
Most op amp accuracy specications convert easily to
DAC accuracy.
Op amp input bias current on the noninverting (+) input is
equivalent to an IL loading the DAC VOUT pin and therefore
produces a DAC zero-scale error (ZSE) (see Unbuffered
Operation):
ZSE = –IB(IN+) ROUT [Volts]
In 16-bit LSBs:
ZSE = –IB IN
+
() 6.2k
66k
VREF
LSB
Op amp input impedance, RIN, is equivalent to an RL
loading the LTC2641/LTC2642 VOUT pin, and produces
a gain error of:
GE =
–66k
1+
6.2k
RIN
LSB
Op amp offset voltage, VOS, corresponds directly to DAC
zero code offset error, ZSE:
ZSE
V
k
V
LSB
OS
REF
=
[]
66
Temperature effects also must be considered. Over the
–40°C to 85°C industrial temperature range, an offset
voltage temperature coefcient (referenced to 25°C) of
0.6μV/°C will add 1LSB of zero-scale error. Also, IBIAS and
the VOFFSET error it causes, will typically show signicant
relative variation over temperature.
Op amp open-loop gain, AVOL, contributes to DAC gain
error (GE):
GE
k
A
LSB
VOL
=
[]
66
Op amp input common mode rejection ratio (CMRR) is
an input-referred error that corresponds to a combina-
tion of gain error (GE) and INL, depending on the op amp
architecture and operating conditions. A conservative
estimate of total CMRR error is:
Error = 10
CMRR
20
VCMRR_RANGE
VREF
66k LSB
where VCMRR_RANGE is the voltage range that CMRR (in
dB) is specied over. Op amp Typical Performance Charac-
teristics graphs are useful to predict the impact of CMRR
errors on DAC performance. Typically, a precision op amp
will exhibit a fairly linear CMRR behavior (corresponding
to DAC gain error only) over most of the common mode
input range (CMR), and become nonlinear and produce
signicant errors near the edge of the CMR.
Rail-to-rail input op amps are a special case, because they
have 2 distinct input stages, one with CMR to GND and
the other with CMR to V+. This results in a “crossover”
CM input region where operation switches between the
two input stages.
The LTC6078 rail-to-rail input op amp typically exhibits
remarkably low crossover linearity error, as shown in the
VOS vs VCM Typical Performance Characteristics graphs
(see the LTC6078 data sheet). Crossover occurs at CM
inputs about 1V below V+, and an LTC6078 operating as
a unipolar DAC buffer with VREF = 2.5V and V+ = 5V will
typically add only about 1LSB of GE and almost no INL
error due to CMRR. Even in a full rail-to-rail application,
with VREF = V+ = 5V, a typical LTC6078 will add only about
1LSB of INL at 16-bits.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC2641CS8-16#PBF | 16-BIT DAC, PDSO8 |
| LTC2641CS8-16#TRPBF | 16-BIT DAC, PDSO8 |
| LTC2752AILX#PBF | 16-BIT DAC, PQFP48 |
| LTC2752ACLX#PBF | 16-BIT DAC, PQFP48 |
| LTC2752BCLX#PBF | 16-BIT DAC, PQFP48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2642ACDD-16#PBF | 功能描述:IC DAC 16BIT VOUT 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
| LTC2642ACDD-16#TRPBF | 功能描述:IC DAC 16BIT VOUT 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
| LTC2642ACMS-16#PBF | 功能描述:IC DAC 16BIT V-OUT 10-MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
| LTC2642ACMS-16#TRPBF | 功能描述:IC DAC 16BIT V-OUT 10-MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
| LTC2642AIDD-16#PBF | 功能描述:IC DAC 16BIT VOUT 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
发布紧急采购，3分钟左右您将得到回复。