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參數(shù)資料
| 型號： | ICL7121JMJI |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | DAC |
| 英文描述： | 16-Bit Multiplying Microprocessor-Compatible D/A Converter |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 1.8 us SETTLING TIME, 16-BIT DAC, CDIP28 |
| 文件頁數(shù)： | 10/10頁 |
| 文件大?。?/td> | 607K |
| 代理商： | ICL7121JMJI |
10
Operational Amplifier Section
The input offset voltage, input current, gain, and bandwidth
of the op amps used affect the circuit performance. Since the
output impedance of I
OUT
varies with the digital input code,
the input current of amplifier A
1
will cause a code-dependent
error at V
OUT
, degrading the linearity. The input bias current
should be significantly less than 1 LSB current, which is
about 10nA. In a similar manner, any offset voltage in A
1
will
cause linearity errors. The offset voltage of the output
amplifier should be significantly less than 1 LSB (153
μ
V at
V
REF
= 5V).
The voltage output setting time is highly dependent on the
slew rate and gain-bandwidth of A
1
, so for high speed
operation a high speed op amp such as the HA2600 is
recommended. For applications where high speed is not
required, the ICL7650 or ICL7652 can be used for A
1
. Since
the ICL7650/52 offset voltage is less than 5
μ
V, no offset
trimming is needed. To get a full 5V output swing from these
op amps,
±
7.5V supplies should be used for the ICL7650/52.
Amplifer A
3
, which is used to generate the inverted
reference, needs only to have a stable offset and to be able
to drive a 3k
load. Since this is strictly a DC amplifier, the
low noise ICL7652 is an ideal choice. Any variation in the
offset voltage of A
3
will result in a drift in the bipolar zero, but
will not affect the linearity of the ICL7121.
Amplifier A
3
, used to generate a high quality ground, also
meeds a low offset and the ability to sink up to 2mA.
Multiplying Mode Performance
While the ICL7121 can perform full four-quadrant
muliplication, full 0.003% linearity is guaranteed only at
V
REF
= +5V. This is because the voltage coefficient of
resistance of the R-2R ladder and the feedback resistor are
significant at the 14-bit or 16-bit level. This effect is most
significant at high voltages, and adds errors on the order of
0.01% for a
±
10V full-scale. While the ICL7121 is tested and
specified for V
REF
= +5V, the R-2R ladder has the same
voltage across it when V
REF
= -5V. Therefore, voltage
coefficients do not add any error with a -5V reference
voltage.
Grounding
Careful consideration must be given to grounding in any high
accuracy system. The current into the analog ground point
inside the chip varies signficantly with the input code value,
and the inevitable resistances between this point and any
external connection point can lead to signficant voltage drop
errors. For this reason, two separate leads are brought out
from this point on the IC: AGND
S
and AGND
F
. The varying
current should be absorbed through the AGND
F
pin, and the
AGND
S
pin will then accurately reflect the voltage on the
internal current summing point, as shown in Figure 6. Output
signals should ideally be referenced to the sense pin
AGND
S
, as shown in the application circuits.
FIGURE 6. GROUND CONNECTIONS
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相關代理商/技術參數(shù) |
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| ICL7121KCJI | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| ICL7121LCJI | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL7121LMJI | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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