参数资料
| 型号： | AD5439YRU |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/29页 |
| 文件大小： | 0K |
| 描述： | IC DAC DUAL 10BIT MULT 16-TSSOP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 96 |
| 设置时间： | 35ns |
| 位数： | 10 |
| 数据接口： | 串行 |
| 转换器数目： | 2 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 3.5µW |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
| 输出数目和类型： | 4 电流，单极；4 电流，双极 |
| 采样率（每秒）： | 2.47M |
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AD5429/AD5439/AD5449
Data Sheet
Rev. E | Page 18 of 28
ADDING GAIN
In applications in which the output voltage must be greater than
VIN, gain can be added with an additional external amplifier, or
it can be achieved in a single stage. Consider the effect of temper-
ature coefficients of the thin film resistors of the DAC. Simply
placing a resistor in series with the RFB resistor causes mismatches
in the temperature coefficients, resulting in larger gain temper-
ature coefficient errors. Instead, the circuit in Figure 42 shows
the recommended method of increasing the gain of the circuit.
R1, R2, and R3 should have similar temperature coefficients,
but they need not match the temperature coefficients of the
DAC. This approach is recommended in circuits in which
gains of greater than 1 are required.
DIVIDER OR PROGRAMMABLE GAIN ELEMENT
Current-steering DACs are very flexible and lend themselves
to many applications. If this type of DAC is connected as the
feedback element of an op amp and RFBA is used as the input
resistor, as shown in Figure 43, the output voltage is inversely
proportional to the digital input fraction, D.
For D = 1 2n, the output voltage is
(
)n
IN
OUT
V
D
V
/
=
/
=
2
1
/
As D is reduced, the output voltage increases. For small values of
the Digital Fraction D, it is important to ensure that the amplifier
does not saturate and the required accuracy is met. For example,
an 8-bit DAC driven with binary code of 0x10 (0001 0000)—that
is, 16 decimal—in the circuit of Figure 43 should cause the output
voltage to be 16 × VIN. However, if the DAC has a linearity speci-
fication of ±0.5 LSB, D can have a weight in the range of 15.5/256
to 16.5/256, so that the possible output voltage is in the range of
15.5 VIN to 16.5 VIN. This range represents an error of 3%, even
though the DAC itself has a maximum error of 0.2%.
DAC leakage current is also a potential error source in divider
circuits. The leakage current must be counterbalanced by an
opposite current supplied from the op amp through the DAC.
Because only a fraction, D, of the current into the VREFx terminal
is routed to the IOUT1 terminal, the output voltage changes as
follows:
Output Error Voltage Due to DAC Leakage = (Leakage × R)/D
where R is the DAC resistance at the VREFx terminal.
For a DAC leakage current of 10 nA, R = 10 k, and a gain (that
is, 1/D) of 16, the error voltage is 1.6 mV.
VDD
RFBA
IOUT1A
IOUT2A
C1
GND
VDD
VREFA
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY.
2. C1 PHASE COMPENSATION (1pF TO 2pF) MAY BE REQUIRED
8-/10-/12-BIT
DAC
VIN
R1
R3
R2
VOUT
R1 =
R2R3
R2 + R3
GAIN =
R2 + R3
R2
04464-011
IF A1 IS A HIGH SPEED AMPLIFIER.
Figure 42. Increasing Gain of Current Output DAC
VIN
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY.
VREFA
VDD
RFBA
IOUT1A
IOUT2A
GND
VOUT
04464-
012
8-/10-/12-BIT
DAC
Figure 43. Current-Steering DAC Used as a Divider or Programmable Gain Element
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5439YRU-REEL | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 10-bit 16-Pin TSSOP T/R 制造商:Analog Devices 功能描述:DAC 2CH R-2R 10-BIT 16TSSOP - Tape and Reel |
| AD5439YRU-REEL7 | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 10-bit 16-Pin TSSOP T/R 制造商:Analog Devices 功能描述:DAC 2CH R-2R 10-BIT 16TSSOP - Tape and Reel |
| AD5439YRUZ | 功能描述:IC DAC DUAL 10BIT MULT 16-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 设置时间:4µs 位数:12 数据接口:串行 转换器数目:2 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-uMAX 包装:管件 输出数目和类型:2 电压，单极 采样率（每秒）:* 产品目录页面:1398 (CN2011-ZH PDF) |
| AD5439YRUZ-REEL | 功能描述:IC DAC DUAL 10BIT MULT 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色产品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 标准包装:91 系列:- 设置时间:4µs 位数:10 数据接口:MICROWIRE?，串行，SPI? 转换器数目:8 电压电源:单电源 功率耗散（最大）:2.7mW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-DFN-EP（4x3） 包装:管件 输出数目和类型:8 电压，单极 采样率（每秒）:* |
| AD5439YRUZ-REEL7 | 功能描述:IC DAC DUAL 10BIT MULT 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色产品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 标准包装:91 系列:- 设置时间:4µs 位数:10 数据接口:MICROWIRE?，串行，SPI? 转换器数目:8 电压电源:单电源 功率耗散（最大）:2.7mW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-DFN-EP（4x3） 包装:管件 输出数目和类型:8 电压，单极 采样率（每秒）:* |
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