- 您现在的位置：买卖IC网 > PDF目录8696 > AD5449YRUZ-REEL7 (Analog Devices Inc)IC DAC DUAL 12BIT MULT 16TSSOP PDF资料下载
参数资料
| 型号： | AD5449YRUZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/29页 |
| 文件大小： | 0K |
| 描述： | IC DAC DUAL 12BIT MULT 16TSSOP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1,000 |
| 设置时间： | 80ns |
| 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）： | 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： | 带卷 (TR) |
| 输出数目和类型： | 4 电流，单极；4 电流，双极 |
| 采样率（每秒）： | 2.47M |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页
Data Sheet
AD5429/AD5439/AD5449
Rev. E | Page 15 of 28
THEORY OF OPERATION
DIGITAL-TO-ANALOG CONVERTER
The AD5429/AD5439/AD5449 are 8-, 10-, and 12-bit, dual-
channel, current output DACs consisting of a standard inverting
R-2R ladder configuration. Figure 37 shows a simplified diagram
for a single channel of the AD5449. The feedback resistor, RFBA,
has a value of R. The value of R is typically 10 kΩ (with a
minimum of 8 kΩ and a maximum of 12 kΩ). If IOUT1A and
IOUT2A are kept at the same potential, a constant current flows
into each ladder leg, regardless of digital input code. Therefore,
the input resistance presented at VREFA is always constant.
2R
S1
2R
S2
2R
S3
2R
S12
2R
DAC DATA LATCHES
AND DRIVERS
R
RFBA
IOUT1A
IOUT2A
VREFA
04464-006
RR
R
Figure 37. Simplified Ladder
Access is provided to the VREFx, RFBx, IOUT1x, and IOUT2x termi-
nals of the DACs, making the devices extremely versatile and
allowing them to be configured in several operating modes, such
as unipolar mode, bipolar output mode, or single-supply mode.
CIRCUIT OPERATION
Unipolar Mode
Using a single op amp, these devices can easily be configured to
provide 2-quadrant multiplying operation or a unipolar output
voltage swing, as shown in Figure 38.
When an output amplifier is connected in unipolar mode, the
output voltage is given by
n
REF
OUT
D
V
2
/
where:
D
is the fractional representation of the digital word loaded to
the DAC.
D
= 0 to 255 (AD5429)
= 0 to 1023 (AD5439)
= 0 to 4095 (AD5449)
n
is the number of bits.
With a fixed 10 V reference, the circuit shown in Figure 38 gives
a unipolar 0 V to 10 V output voltage swing. When VIN is an ac
signal, the circuit performs 2-quadrant multiplication.
Table 5 shows the relationship between digital code and the
expected output voltage for unipolar operation using the 8-bit
AD5429 DAC.
Table 5. Unipolar Code Table
Digital Input
Analog Output (V)
1111 1111
VREF (255/256)
1000 0000
VREF (128/256) = VREF/2
0000 0001
VREF (1/256)
0000 0000
VREF (0/256) = 0
AD5429/
AD5439/
AD5449
04
46
4-
0
07
NOTES
1. R1 AND R2 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED.
2. C1 PHASE COMPENSATION (1pF TO 2pF) MAY BE REQUIRED
3. DAC B OMITTED FOR CLARITY.
IOUT1A
IOUT2A
VREFx
VDD
C1
A1
VOUT = 0V TO –VREF
AGND
R2
VDD
VREF
SDIN
GND
SCLK
SYNC
RFBA
R1
IF A1 IS A HIGH SPEED AMPLIFIER.
MICROCONTROLLER
Figure 38. Unipolar Operation
相关PDF资料 |
PDF描述 |
|---|---|
| V300A8H400BF3 | CONVERTER MOD DC/DC 8V 400W |
| ICS8344AY-01LFT | IC CLOCK BUFFER MUX 2:24 48-LQFP |
| AD5447YRUZ-REEL | IC DAC 12BIT DUAL MULT 24TSSOP |
| ICS8536AG-02LFT | IC CLOCK BUFFER MUX 3:6 24-TSSOP |
| VI-B6W-MV-F4 | CONVERTER MOD DC/DC 5.5V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD544JH | 制造商:Rochester Electronics LLC 功能描述:ULTRA-LOW DRIFT OP AMP IC - Bulk |
| AD544JH/+ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD544KH | 制造商:AD 功能描述:544 ANALOG |
| AD544KH/+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Operational Amplifier |
| AD544LH | 制造商:Rochester Electronics LLC 功能描述:ULTRA-LOW DRIFT OP AMP IC - Bulk |
发布紧急采购，3分钟左右您将得到回复。