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參數資料
| 型號： | AD5449YRUZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 13/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC DUAL 12BIT MULT 16TSSOP |
| 產品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 1,000 |
| 設置時間： | 80ns |
| 位數： | 12 |
| 數據接口： | 串行 |
| 轉換器數目： | 2 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 3.5µW |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 16-TSSOP |
| 包裝： | 帶卷 (TR) |
| 輸出數目和類型： | 4 電流，單極；4 電流，雙極 |
| 采樣率（每秒）： | 2.47M |
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Data Sheet
AD5429/AD5439/AD5449
Rev. E | Page 19 of 28
REFERENCE SELECTION
When selecting a reference for use with the AD54xx series of
current output DACs, pay attention to the reference output voltage
temperature coefficient specification. This parameter affects not
only the full-scale error, but it 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 of 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 a low output
temperature coefficient, this error source can be minimized.
Table 7 lists some references available from Analog Devices, Inc.,
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.
Because of the code-dependent output resistance of the DAC,
the input offset voltage of an op amp is multiplied by the variable
gain of the circuit. A change in this noise gain between two
adjacent digital fractions produces a step change in the output
voltage due to the amplifier 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. The input bias current of an op amp also generates
an offset at the voltage output as a result of the bias current flowing
in 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 because 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.
If the DAC switches are driven from true wideband low impedance
sources (VIN and AGND), they settle quickly. Consequently, the
slew rate and settling time of a voltage-switching DAC circuit
is determined largely by the output op amp. To obtain minimum
settling time in this configuration, minimize capacitance at the
VREF node (the voltage output node in this application) of the
DAC by using low input capacitance buffer amplifiers and careful
board design.
Most single-supply circuits include ground as part of the analog
signal range, which, in turn, requires an amplifier that can handle
rail-to-rail signals. Analog Devices offers a wide range of single-
supply amplifiers (see Table 8 and Table 9).
Table 7. Suitable Analog Devices Precision References
Part No.
OutputVoltage (V)
Initial Tolerance (%)
Temp Drift (ppm/°C)
ISS (mA)
Output Noise (V p-p)
Package
ADR01
10
0.05
3
1
20
SOIC-8
ADR01
10
0.05
9
1
20
TSOT-23, SC70
ADR02
5
0.06
3
1
10
SOIC-8
ADR02
5
0.06
9
1
10
TSOT-23, SC70
ADR03
2.5
0.10
3
1
6
SOIC-8
ADR03
2.5
0.10
9
1
6
TSOT-23, SC70
ADR06
3
0.10
3
1
10
SOIC-8
ADR06
3
0.10
9
1
10
TSOT-23, SC70
ADR431
2.5
0.04
3
0.8
3.5
SOIC-8
ADR435
5
0.04
3
0.8
8
SOIC-8
ADR391
2.5
0.16
9
0.12
5
TSOT-23
ADR395
5
0.10
9
0.12
8
TSOT-23
Table 8. Suitable Analog Devices Precision Op Amps
Part No.
SupplyVoltage (V)
VOS (Max) (V)
IB (Max) (nA)
0.1 Hz to 10 Hz Noise (V p-p)
Supply Current (A)
Package
OP97
±2 to ±20
25
0.1
0.5
600
SOIC-8
OP1177
±2.5 to ±15
60
2
0.4
500
MSOP, SOIC-8
AD8551
2.7 to 5
5
0.05
1
975
MSOP, SOIC-8
AD8603
1.8 to 6
50
0.001
2.3
50
TSOT
AD8628
2.7 to 6
5
0.1
0.5
850
TSOT, SOIC-8
Table 9. Suitable Analog Devices High Speed Op Amps
Part No.
Supply Voltage (V)
BW @ ACL (MHz)
Slew Rate (V/s)
VOS (Max) (V)
IB (Max) (nA)
Package
AD8065
5 to 24
145
180
1500
6000
SOIC-8, SOT-23, MSOP
AD8021
±2.5 to ±12
490
120
1000
10,500
SOIC-8, MSOP
AD8038
3 to 12
350
425
3000
750
SOIC-8, SC70-5
AD9631
±3 to ±6
320
1300
10,000
7000
SOIC-8
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