參數(shù)資料
型號(hào)： EVAL-AD7661CBZ
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7661
標(biāo)準(zhǔn)包裝： 1
系列： PulSAR®
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 100k
數(shù)據(jù)接口： 串行，并聯(lián)
輸入范圍： ±VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 16mW @ 100kSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7661
已供物品： 板，CD
相關(guān)產(chǎn)品： AD7661ACPZRL-ND - IC ADC 16BIT W/REF 48-LFCSP
AD7661ASTZ-ND - IC ADC 16BIT W/REF 48-LQFP
AD7661ACPZ-ND - IC ADC 16BIT W/REF 48LFCSP
AD7661ASTZRL-ND - IC ADC 16BIT W/REF 48LQFP
AD7661
Rev. 0 | Page 20 of 28
For applications that use multiple AD7661s, it is more effective
to use the internal buffer to buffer the reference voltage.
Care should be taken with the voltage reference’s temperature
coefficient, which directly affects the full-scale accuracy if this
parameter matters. For instance, a ±15 ppm/°C temperature
coefficient of the reference changes full scale by ±1 LSB/°C.
Note that VREF can be increased to AVDD – 1.85 V. Since the
input range is defined in terms of VREF, this would essentially
increase the range to 0 V to 3 V with an AVDD above 4.85 V.
The AD780 can be selected with a 3 V reference voltage.
The TEMP pin, which measures the temperature of the
AD7661, can be used as shown in Figure 30. The output of
TEMP pin is applied to one of the inputs of the analog switch
(e.g., ADG779), and the ADC itself is used to measure its own
temperature. This configuration is very useful for improving the
calibration accuracy over the temperature range.
ADG779
AD8021
CC
03033-0-024
ANALOG INPUT
(UNIPOLAR)
AD7661
IN
TEMPERATURE
SENSOR
TEMP
Figure 30. Temperature Sensor Connection Diagram
Power Supply
The AD7661 uses three power supply pins: an analog 5 V supply
AVDD, a digital 5 V core supply DVDD, and a digital input/
output interface supply OVDD. OVDD allows direct interface
with any logic between 2.7 V and DVDD + 0.3 V. To reduce the
supplies needed, the digital core (DVDD) can be supplied
through a simple RC filter from the analog supply, as shown in
Figure 26. The AD7661 is independent of power supply
sequencing once OVDD does not exceed DVDD by more than
0.3 V, and is thus free of supply voltage induced latch-up.
Additionally, it is very insensitive to power supply variations
over a wide frequency range, as shown in Figure 31, which
represents PSRR over frequency with on chip and external
references.
30
40
50
60
70
80
90
1
10
100
1000
10000
FREQUENCY (kHz)
P
S
RR
(dB)
03033-0-044
EXT REF
INT REF
Figure 31. PSRR vs. Frequency
POWER DISSIPATION VERSUS THROUGHPUT
Operating currents are very low during the acquisition phase,
allowing significant power savings when the conversion rate is
reduced (see Figure 32). The AD7661 automatically reduces its
power consumption at the end of each conversion phase. This
makes the part ideal for very low power battery applications.
The digital interface and the reference remain active even
during the acquisition phase. To reduce operating digital supply
currents even further, digital inputs need to be driven close to
the power supply rails (i.e., DVDD or DGND), and OVDD
should not exceed DVDD by more than 0.3 V.
SAMPLE RATE (SPS)
10
03033-0-045
100
10000
100000
1000
10000
100
1000
100000
10
POW
E
R
DISSIPATION
(
W)
PDREF = PDBUF = HIGH
Figure 32. Power Dissipation vs. Sampling Rate
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參數(shù)描述
EVAL-AD7661EDZ 功能描述:BOARD EVAL FOR AD7661 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:* 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
EVAL-AD7662CB 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Evaluation Board AD766X/AD767X
EVAL-AD7663CB 制造商:Analog Devices 功能描述:
EVAL-AD7663CBZ 功能描述:BOARD EVALUATION FOR AD7663 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:PulSAR® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
EVAL-AD7663EDZ 制造商:Analog Devices 功能描述:CONVERTER - ADC
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