參數(shù)資料
| 型號： | AD5626BRMZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC NANO 12BIT 8-MSOP |
| 產品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 50 |
| 系列： | nanoDAC™ |
| 設置時間： | 16µs |
| 位數(shù)： | 12 |
| 數(shù)據接口： | 串行 |
| 轉換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 12.5mW |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 1 電壓，單極；1 電壓，雙極 |
| 采樣率（每秒）： | * |
AD5626
Rev. A | Page 15 of 20
For the ±2.5 V output range and the circuit values shown in the
table in Figure 31, the transfer equation becomes
VO = 1.22 mV × Digital Code 2.5 V
Similarly, for the 5 V output range, the transfer equation
becomes
VO = 2.44 mV × Digital Code 5 V
GENERATING A NEGATIVE SUPPLY VOLTAGE
Some applications may require bipolar output configuration
but only have a single power supply rail available. This is very
common in data acquisition systems using microprocessor-
based systems. In these systems, only 12 V, 15 V, and/or 5 V
are available.
Figure 32 shows a method for generating a negative supply
voltage using one CD4049, a CMOS hexadecimal inverter, and
operating on 12 V or 15 V. The circuit is essentially a charge
pump where two of the six inverters are used as an oscillator.
For the values shown, the frequency of oscillation is approx-
imately 3.5 kHz and is fairly insensitive to supply voltage
because R1 > 2 × R2.
The remaining four inverters are wired in parallel for higher
output current. The square wave output is level translated by C2
to a negative-going signal rectified using a pair of 1N4001s, and
then filtered by C3. With the values shown, the charge pump
provides an output voltage of 5 V for currents loading in the
range 0.5 mA ≤ IOUT ≤ 10 mA with a 15 V supply and 0.5 mA ≤
IOUT ≤ 7 mA with a 12 V supply.
06757-
032
7
9
11
14
6
54
32
R1
510k
R3
470
D2
1N4001
R2
5.1k
C1
0.02F
C3
47F
D1
1N4001
1N5231
5.1V
ZENER
C2
47F
–5V
INVERTERS = CD4049
10
12
15
+
Figure 32. Generating a –5 V Supply When Only 12 V or 15 V Is Available
A SINGLE-SUPPLY, PROGRAMMABLE
CURRENT SOURCE
The circuit in Figure 33 shows how the AD5626 can be used
with an OP295 single-supply, rail-to-rail, output op amp to
provide a digitally programmable current sink from VSOURCE
that consumes less than 3.8 mA, maximum. The DAC output
voltage is applied across R1 by placing the 2N2222 transistor in
the feedback loop of the OP295. For the circuit values shown,
the full-scale output current is 1 mA, which is given by the
following equation:
R1
DW
I
OUT
V
095
.
4
×
=
where DW = the binary digital input code of the AD5626.
0
6757-
033
CS
CLR
SCLK
LDAC
SDIN
2
8
6
5
3
4
1
7
AD5626
+5V
VS
2N2222
LOAD
P1
200
R1
4.02k
A1 = 1/2 OP295
FULL-SCALE
ADJUST
0.1F
5V
VDD
A1
2
1
3 +
–
VOUT
GND
Figure 33. A Single-Supply, Programmable Current Source
The usable output voltage range of the current sink is 5 V to
60 V. The low limit of the range is controlled by transistor
saturation, and the high limit is controlled by the collector-base
breakdown voltage of the 2N2222.
GALVANICALLY-ISOLATED INTERFACE
In many process control type applications, it is necessary to
provide an isolation barrier between the controller and the unit
being controlled to protect and isolate the controlling circuitry
from any hazardous common-mode voltages that may occur.
An iCoupler can provide isolation in excess of 2.5 kV. The
serial loading structure of the AD5626 makes it ideal for
isolated interfaces as the number of interface lines is kept to
a minimum. Figure 34 illustrates a 4-channel isolated interface
using an ADuM1400. For further information, visit
ENCODE
DECODE
ENCODE
DECODE
ENCODE
DECODE
VIA
VIB
VIC
VID
VOA
VOB
VOC
VOD
ENCODE
DECODE
ADuM1400*
MICROCONTROLLER
SERIAL CLOCK OUT
SERIAL DATA OUT
SYNC OUT
CONTROL OUT
TO SCLK
TO SDIN
TO SYNC
TO LDAC
*ADDITIONAL PINS OMITTED FOR CLARITY.
0
675
7-
0
34
Figure 34. An iCoupler-Isolated DAC Interface
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| AD5626BRMZ-REEL7 | 功能描述:IC DAC NANO 12BIT 8-MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據采集 - 數(shù)模轉換器 系列:nanoDAC™ 產品培訓模塊:Data Converter Fundamentals DAC Architectures 設計資源:Unipolar, Precision DC Digital-to-Analog Conversion using AD5450/1/2/3 8-14-Bit DACs (CN0052) Precision, Bipolar, Configuration for AD5450/1/2/3 8-14bit Multiplying DACs (CN0053) AC Signal Processing Using AD5450/1/2/3 Current Output DACs (CN0054) Programmable Gain Element Using AD5450/1/2/3 Current Output DAC Family (CN0055) Single Supply Low Noise LED Current Source Driver Using a Current Output DAC in the Reverse Mode (CN0139) 標準包裝:10,000 系列:- 設置時間:- 位數(shù):12 數(shù)據接口:DSP，MICROWIRE?，QSPI?，串行，SPI? 轉換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 薄型，TSOT-23-8 供應商設備封裝:TSOT-23-8 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:2.7M |
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| AD5627BCPZ-250RL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual, 12-/14-/16-Bit nanoDACs with 5ppm/C On-Chip Ref, I2C Interface |
| AD5627BCPZ-R2 | 功能描述:IC DAC 12BIT DUAL 10-LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據采集 - 數(shù)模轉換器 系列:nanoDAC™ 產品培訓模塊:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色產品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 標準包裝:91 系列:- 設置時間:4µs 位數(shù):10 數(shù)據接口:MICROWIRE?，串行，SPI? 轉換器數(shù)目:8 電壓電源:單電源 功率耗散（最大）:2.7mW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-DFN-EP（4x3） 包裝:管件 輸出數(shù)目和類型:8 電壓，單極 采樣率（每秒）:* |
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