參數(shù)資料
型號(hào)： AD5755BCPZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 41/52頁(yè)
文件大小： 0K
描述： IC DAC 16BIT QUAD 64-LFCSP
視頻文件： AD5755: 16-Bit Multi-Channel, Voltage and Current Output DAC
標(biāo)準(zhǔn)包裝： 750
設(shè)置時(shí)間： 11µs
位數(shù)： 16
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 4
電壓電源： 模擬和數(shù)字，雙 ±
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 64-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 64-LFCSP-VQ（9x9）
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 4 電流，4 電壓
采樣率（每秒）： *
AD5755
Data Sheet
Rev. C | Page 46 of 52
APPLICATIONS INFORMATION
VOLTAGE AND CURRENT OUTPUT RANGES ON
THE SAME TERMINAL
When using a channel of the AD5755, the current and voltage
output pins can be connected to two separate terminals or tied
together and connected to a single terminal. There is no conflict
with tying the two output pins together because only the voltage
output or the current output can be enabled at any one time.
When the current output is enabled, the voltage output is in
tristate mode, and when the voltage output is enabled, the
current output is in tristate mode. For this operation, the POC
pin must be tied low and the POC bit in the main control
register set to 0, or, if the POC pin is tied high, the POC bit in
the main control register must be set to 1 before the current
output is enabled.
As shown in the Absolute Maximum Ratings section, the output
tolerances are the same for both the voltage and current output
pins. The +VSENSE_x and VSENSE_x connections are buffered so
that current leakage into these pins is negligible when in current
output mode.
CURRENT OUTPUT MODE WITH INTERNAL RSET
When using the internal RSET resistor in current output mode,
the output is significantly affected by how many other channels
using the internal RSET are enabled and by the dc crosstalk from
these channels. The internal RSET specifications in Table 1 are
for all channels enabled with the internal RSET selected and
outputting the same code.
For every channel enabled with the internal RSET, the offset error
decreases. For example, with one current output enabled using
the internal RSET, the offset error is 0.075% FSR. This value
decreases proportionally as more current channels are enabled;
the offset error is 0.056% FSR on each of two channels, 0.029%
on each of three channels, and 0.01% on each of four channels.
Similarly, the dc crosstalk when using the internal RSET is propor-
tional to the number of current output channels enabled with
the internal RSET. For example, with the measured channel at
0x8000 and one channel going from zero to full scale, the dc
crosstalk is 0.011% FSR. With two channels going from zero to
full scale, it is 0.019% FSR, and with all three other channels
going from zero to full scale, it is 0.025% FSR.
For the full-scale error measurement in Table 1, all channels are
at 0xFFFF. This means that, as any channel goes to zero scale,
the full-scale error increases due to the dc crosstalk. For
example, with the measured channel at 0xFFFF and three
channels at zero scale, the full-scale error is 0.025%. Similarly,
if only one channel is enabled in current output mode with the
internal RSET, the full-scale error is 0.025% FSR + 0.075% FSR =
0.1% FSR.
PRECISION VOLTAGE REFERENCE SELECTION
To achieve the optimum performance from the AD5755 over its
full operating temperature range, a precision voltage reference
must be used. Thought should be given to the selection of a
precision voltage reference. The voltage applied to the reference
inputs is used to provide a buffered reference for the DAC cores.
Therefore, any error in the voltage reference is reflected in the
outputs of the device.
There are four possible sources of error to consider when
choosing a voltage reference for high accuracy applications:
initial accuracy, temperature coefficient of the output voltage,
long term drift, and output voltage noise.
Initial accuracy error on the output voltage of an external refer-
ence can lead to a full-scale error in the DAC. Therefore, to
minimize these errors, a reference with low initial accuracy
error specification is preferred. Choosing a reference with an
output trim adjustment, such as the ADR425, allows a system
designer to trim system errors out by setting the reference
voltage to a voltage other than the nominal. The trim adjust-
ment can be used at any temperature to trim out any error.
Long-term drift is a measure of how much the reference output
voltage drifts over time. A reference with a tight long-term drift
specification ensures that the overall solution remains relatively
stable over its entire lifetime.
The temperature coefficient of a reference’s output voltage affects
INL, DNL, and TUE. A reference with a tight temperature
coefficient specification should be chosen to reduce the depend-
ence of the DAC output voltage to ambient temperature.
In high accuracy applications, which have a relatively low noise
budget, reference output voltage noise must be considered.
Choosing a reference with as low an output noise voltage as
practical for the system resolution required is important. Precision
voltage references such as the ADR435 (XFET design) produce
low output noise in the 0.1 Hz to 10 Hz region. However, as the
circuit bandwidth increases, filtering the output of the reference
may be required to minimize the output noise.
Table 34. Recommended Precision References
Part No.
Initial Accuracy
(mV Maximum)
Long-Term Drift
(ppm Typical)
Temperature Drift (ppm/°C Maximum)
0.1 Hz to 10 Hz Noise
(V p-p Typical)
±2
50
3
2.25
±3
50
3
10
±2
40
3
8
±5
50
9
8
±2.5
15
10
4
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