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參數(shù)資料
| 型號(hào)： | AD7302BRU |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 8BIT DUAL R-R 20-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Fundamentals DAC Architectures |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標(biāo)準(zhǔn)包裝： | 75 |
| 設(shè)置時(shí)間： | 1.2µs |
| 位數(shù)： | 8 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 24.8mW |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 2 電壓，單極；2 電壓，雙極 |
| 采樣率（每秒）： | 833k |
AD7302
–14–
REV. 0
Programmable Current Source
Figure 35 shows the AD7302 used as the control element of a
programmable current source. In this circuit the full-scale
current is set to 1 mA. The output voltage from the DAC is
applied across the current setting resistor of 4.7 k
in series
with the full-scale setting resistor of 470
. Transistors suitable
to place in the feedback loop of the amplifier include the BC107
or the 2N3904, which enable the current source to operate from
a min VSOURCE of 6 V. The operating range is determined by
the operating characteristics of the of the transistor. Suitable
amplifiers include the AD820 and the OP295 both having rail-
to-rail operation on their outputs. The current for any digital
input code can be calculated as follows:
I = 2
× V
REF × D/(5E +3 × 256) mA
AD7302
VOUTA
10F
0.1F
VDD = 5V
VDD
AGND
AD780/REF192
WITH VDD = 5V
REF IN
GND
VOUT
VIN
0.1F
EXT REF
4.7k
470
+5V
LOAD
VSOURCE
AD820/
OP295
DGND
Figure 35. Programmable Current Source
Coarse and Fine Adjustment Using the AD7302
The DACs on the AD7302 can be paired together to form a
coarse and fine adjustment function as shown in Figure 36. In
this circuit DAC A is used to provide the coarse function while
DAC B is used to provide the fine adjustment. Varying the ratio
of R1 and R2 will vary the relative effect of the coarse and fine
tune elements in the circuit. For the resistor values shown
DAC B has a resolution of 148
V giving a fine tune range of
approximately 2 LSBs for operation with a VDD of 5 V and a
reference of 2.5 V. The amplifiers shown allow a rail-to-rail
output voltage to be achieved on the output. A typical applica-
tion for such a circuit would be in a setpoint controller.
AD7302
VOUTA
10F
0.1F
VDD = 5V
VDD
AGND
AD780/REF192
WITH VDD = 5V
OR
AD589 WITH VDD = 3V
REF IN
GND
VOUT
VIN
0.1F
EXT REF
R2
51.2k
R4
390
R1
390
+5V
VOUT
DGND
AD820/
OP295
VOUTB
R3
51.2k
Figure 36. Coarse/Fine Adjust Circuit
Power Supply Bypassing and Grounding
In any circuit where accuracy is important, careful consideration
of the power supply and ground return layout helps to ensure
the rated performance. The printed circuit board on which the
AD7302 is mounted should be designed so the analog and
digital sections are separated and confined to certain areas of the
board. If the AD7302 is in a system where multiple devices
require an AGND to DGND connection, the connection should
be made at one point only, a star ground point that should be
established as closely as possible to the AD7302. The AD7302
should have ample supply bypassing of 10
F in parallel with
0.1
F on the supply located as close to the package as possible,
ideally right up against the device. The 10
F capacitors are the
tantalum bead type. The 0.1
F capacitor should have low
Effective Series Resistance (ESR) and Effective Series Induc-
tance (ESI), such as the common ceramic types, which provide
a low impedance path to ground at high frequencies to handle
transient currents due to internal logic switching.
The power supply lines of the AD7302 should use as large a
trace as possible to provide low impedance paths and reduce the
effects of glitches on the power supply line. Fast switching sig-
nals like clocks should be shielded with digital ground to avoid
radiating noise to other parts of the board and should never be
run near the reference inputs. Avoid crossover of digital and
analog signals. Traces on opposite sides of the board should run
at right angles to each other. This reduces the effects of feed-
through through the board. A microstrip technique is by far the
best, but not always possible with a double-sided board. In this
technique, the component side of the board is dedicated to
ground plane while signal traces are placed on the solder side.
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參數(shù)描述 |
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| AD7302BRU-REEL | 制造商:Analog Devices 功能描述:DAC 2-CH 8-bit 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:DAC 2CH 8BIT 20TSSOP - Tape and Reel |
| AD7302BRU-REEL7 | 制造商:Analog Devices 功能描述:DAC 2-CH 8-bit 20-Pin TSSOP T/R |
| AD7302BRUZ | 功能描述:IC DAC 8BIT DUAL R-R 20-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 設(shè)置時(shí)間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 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(yīng)商設(shè)備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產(chǎn)品目錄頁面:1398 (CN2011-ZH PDF) |
| AD7302BRUZ | 制造商:Analog Devices 功能描述:IC 8-BIT DAC |
| AD7302BRUZ-REEL | 功能描述:IC DAC 8BIT DUAL R-R 20-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 設(shè)計(jì)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(biāo)準(zhǔn)包裝:10,000 系列:- 設(shè)置時(shí)間:- 位數(shù):12 數(shù)據(jù)接口:DSP，MICROWIRE?，QSPI?，串行，SPI? 轉(zhuǎn)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(yīng)商設(shè)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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