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参数资料
| 型号： | DC1096A |
| 厂商： | Linear Technology |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | BOARD DAC LTC2642-16 |
| 软件下载： | QuikEval System |
| 设计资源： | DC1096A Design File DC1096A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| DAC 的数量： | 1 |
| 位数： | 16 |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 设置时间： | 1µs |
| DAC 型： | 电压 |
| 工作温度： | 0°C ~ 70°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTC2642-16 |
LTC2641/LTC2642
16
26412fc
For more information www.linear.com/LTC2641
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 38V, 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 amplifier 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 specifications on the LTC2641/LTC2642, means
that the accuracy and input specifications for the external
op amp are critical for overall DAC performance.
Op Amp Specifications and Unipolar DAC Accuracy
Most op amp accuracy specifications 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:
ZSEV
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 coefficient (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 significant
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)isspecifiedover.OpampTypicalPerformanceCharac-
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
significant 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1096B | 制造商:Linear Technology 功能描述:BOARD EVAL FOR LTC2641/2 制造商:Linear Technology 功能描述:DEMO BOARD, LTC2642A-16 16BIT DAC; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2642A-16; Kit Application Type:Data Converter; Application Sub Type:DAC; Kit Contents:Demo Board LTC2642A-16 |
| DC1096D03XO_D4X WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DC1096D03XY_D4X WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DC1096D04XR_D4X WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DC1099A | 功能描述:BOARD EVAL LTC2953 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
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