參數(shù)資料
型號： ADM00317
廠商： Microchip Technology
文件頁數(shù)： 58/86頁
文件大?。?/td> 0K
描述： BOARD DAUGHTER MCP4706/16/26
標(biāo)準(zhǔn)包裝： 1
DAC 的數(shù)量： 3 個，每 IC 1 個
位數(shù)： 8，10，12
設(shè)置時間： 6µs
DAC 型： 電壓
已供物品： 子板
已用 IC / 零件： MCP4706，MCP4716，MCP4726
2011-2012 Microchip Technology Inc.
DS22272C-page 61
MCP4706/4716/4726
7.9
Gain Error
The Gain error (see Figure 7-4) is the difference
between the actual full-scale output voltage from the
ideal output voltage of the DAC transfer curve. The
Gain error is calculated after nullifying the Offset error,
or Full-Scale error minus the Offset error.
The Gain error indicates how well the slope of the
actual transfer function matches the slope of the ideal
transfer function. The Gain error is usually expressed
as percent of full-scale range (% of FSR) or in LSb.
In the MCP4706/4716/4726, the Gain error is not
calibrated at the factory and most of the Gain error is
contributed by the output buffer (op amp) saturation
near
the
code
range
beyond
4000d.
For
the
applications that need the Gain error specification less
than 1% maximum, the user may consider using the
DAC code range between 100d and 4000d instead of
using full code range (code 0 to 4095d). The DAC
output of the code range between 100d and 4000d is
much more linear than full-scale range (0 to 4095d).
The Gain error can be calibrated out by software in the
application.
FIGURE 7-4:
Gain Error and Full-Scale
Error Example.
7.10
Gain Error Drift
The Gain error drift is the variation in Gain error due to
a change in ambient temperature. The Gain error drift
is typically expressed in ppm/oC.
7.11
Offset Error Drift
The Offset error drift is the variation in Offset error due
to a change in ambient temperature. The Offset error
drift is typically expressed in ppm/oC.
7.12
Settling Time
The Settling time is the time delay required for the VOUT
voltage to settle into its new output value. This time is
measured from the start of code transition, to when the
VOUT voltage is within the specified accuracy.
In the MCP47X6, the settling time is a measure of the
time delay until the VOUT voltage reaches within 0.5
LSb of its final value, when the volatile DAC register
changes from 400h to C00h.
7.13
Major-Code Transition Glitch
Major-code transition glitch is the impulse energy
injected into the DAC analog output when the code in
the DAC register changes state. It is normally specified
as the area of the glitch in nV-Sec, and is measured
when the digital code is changed by 1 LSb at the major
carry transition (Example: 011...111 to 100...
000
, or 100... 000 to 011 ... 111).
7.14
Digital Feedthrough
The digital feedthrough is the glitch that appears at the
analog output caused by coupling from the digital input
pins of the device. The area of the glitch is expressed
in nV-Sec, and is measured with a full scale change
(Example: all 0s to all 1s and vice versa) on the digital
input pins. The digital feedthrough is measured when
the DAC is not being written to the output register.
7.15
Power-Supply Rejection Ratio
(PSRR)
PSRR indicates how the output of the DAC is affected
by changes in the supply voltage. PSRR is the ratio of
the change in VOUT to a change in VDD for full-scale
output of the DAC. The VOUT is measured while the
VDD is varied +/- 10%, and expressed in dB or V/V.
Analog
Output
Actual Transfer Function
DAC Input Code
0
Gain Error
Ideal Transfer Function
after Offset Error is removed
Full-Scale
Error
Zero-Scale
Error
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