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| 型号： | EVAL-AD5433EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/29页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5433 |
| 产品培训模块： | DAC Architectures |
| 标准包装： | 1 |
| DAC 的数量： | 1 |
| 位数： | 10 |
| 采样率（每秒）： | 20.4M |
| 数据接口： | 并联 |
| 设置时间： | 35ns |
| DAC 型： | 电流 |
| 工作温度： | -40°C ~ 125°C |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | AD5433 |
| 相关产品： | AD5433YRUZ-ND - IC DAC 10BIT MULTIPLYING 20TSSOP AD5433YCPZ-ND - IC DAC 10BIT MULTIPLYING 20LFCSP AD5433YRUZ-REEL7-ND - IC DAC 10BIT MULTIPLYING 20TSSOP AD5433YRUZ-REEL-ND - IC DAC 10BIT MULTIPLYING 20TSSOP AD5433YRU-REEL-ND - IC DAC 10BIT MULTIPLYING 20TSSOP AD5433YRU-ND - IC DAC 10BIT MULTIPLYING 20TSSOP |
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AD5424/AD5433/AD5445
Data Sheet
Rev. D | Page 22 of 28
Table 9. Suitable ADI Precision References
Part No.
Output Voltage (V)
Initial Tolerance (%)
Temp Drift (ppm/°C)
ISS (mA)
Output Noise (V p-p)
Package
10
0.05
3
1
20
SOIC-8
10
0.05
9
1
20
TSOT-23, SC70
5
0.06
3
1
10
SOIC-8
5
0.06
9
1
10
TSOT-23, SC70
2.5
0.10
3
1
6
SOIC-8
2.5
0.10
9
1
6
TSOT-23, SC70
3
0.10
3
1
10
SOIC-8
3
0.10
9
1
10
TSOT-23, SC70
2.5
0.04
3
0.8
3.5
SOIC-8
5
0.04
3
0.8
8
SOIC-8
2.5
0.16
9
0.12
5
TSOT-23
5
0.10
9
0.12
8
TSOT-23
Table 10. Suitable ADI Precision Op Amps
Part No.
Supply Voltage (V)
VOS (Max) (V)
IB (Max) (nA)
0.1 Hz to 10 Hz
Noise (V p-p)
Supply Current (A)
Package
±2 to ±20
25
0.1
0.5
600
SOIC-8
±2.5 to ±15
60
2
0.4
500
MSOP, SOIC-8
2.7 to 5
5
0.05
1
975
MSOP, SOIC-8
1.8 to 6
50
0.001
2.3
50
TSOT
2.7 to 6
5
0.1
0.5
850
TSOT, SOIC-8
Table 11. Suitable ADI High Speed Op Amps
Part No.
Supply Voltage (V)
BW at ACL (MHz)
Slew Rate (V/s)
VOS (Max) (V)
IB (Max) (nA)
Package
5 to 24
145
180
1500
6000
SOIC-8, SOT-23, MSOP
±2.5 to ±12
490
120
1000
10500
SOIC-8, MSOP
3 to 12
350
425
3000
750
SOIC-8, SC70-5
±3 to ±6
320
1300
10000
7000
SOIC-8
REFERENCE SELECTION
AD5445 family of current output DACs, pay attention to the
reference’s output voltage temperature coefficient specification.
This parameter not only affects the full-scale error, but can also
affect the linearity (INL and DNL) performance. The reference
temperature coefficient should be consistent with the system
accuracy specifications. For example, an 8-bit system required
to hold its overall specification to within 1 LSB over the
temperature range 0°C to 50°C dictates that the maximum
system drift with temperature should be less than 78 ppm/°C.
A 12-bit system with the same temperature range to overall
specification within 2 LSBs requires a maximum drift of
10 ppm/°C. By choosing a precision reference with low output
temperature coefficient this error source can be minimized.
Table 9 suggests some references available from Analog Devices
that are suitable for use with this range of current output DACs.
AMPLIFIER SELECTION
The primary requirement for the current-steering mode is an
amplifier with low input bias currents and low input offset
voltage. The input offset voltage of an op amp is multiplied by
the variable gain (due to the code dependent output resistance
of the DAC) of the circuit. A change in the noise gain between
two adjacent digital fractions produces a step change in the output
voltage due to the amplifier’s input offset voltage. This output
voltage change is superimposed on the desired change in output
between the two codes and gives rise to a differential linearity
error, which, if large enough, could cause the DAC to be non-
monotonic. In general, the input offset voltage should be <1/4
LSB to ensure monotonic behavior when stepping through codes.
The input bias current of an op amp also generates an offset at
the voltage output as a result of the bias current flowing into the
feedback resistor, RFB. Most op amps have input bias currents
low enough to prevent significant errors in 12-bit applications.
Common-mode rejection of the op amp is important in voltage-
switching circuits, since it produces a code dependent error at
the voltage output of the circuit. Most op amps have adequate
common mode rejection for use at 8-, 10-, and 12-bit resolution.
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