參數(shù)資料
型號： EVAL-AD7652CBZ
廠商： Analog Devices Inc
文件頁數(shù)： 10/28頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7652
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）： 500k
數(shù)據(jù)接口： 串行，并聯(lián)
輸入范圍： 0 ~ 2.5 V
在以下條件下的電源（標(biāo)準(zhǔn)）： 65mW @ 500kSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7652
已供物品： 板
相關(guān)產(chǎn)品： AD7652ASTZ-ND - IC ADC 16BIT 500KSPS REF 48LQFP
AD7652ACPZ-ND - IC ADC 16BIT UNIPOLAR 48LFCSP
AD7652ACPZRL-ND - IC ADC 16BIT UNIPOLAR 48LFCSP
AD7652ASTZRL-ND - IC ADC 16BIT UNIPOLAR 48LQFP
AD7652
Voltage Reference Input
For applications that use multiple AD7652s, it is more effective
to use the internal buffer to buffer the reference voltage.
The AD7652 allows the choice of either a very low temperature
drift internal voltage reference or an external 2.5 V reference.
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.
Unlike many ADCs with internal references, the internal
reference of the AD7652 provides excellent performance and
can be used in almost all applications.
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.
To use the internal reference along with the internal buffer,
PDREF and PDBUF should both be LOW. This will produce a
1.207 V voltage on REFBUFIN which, amplified by the buffer,
will result in a 2.5 V reference on the REF pin.
The TEMP pin, which measures the temperature of the AD7652,
can be used as shown in
. 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.
The output impedance of REFBUFIN is 11 k (minimum) when
the internal reference is enabled.
It is useful to decouple
REFBUFIN with a 100 nF ceramic capacitor. Thus, the 100 nF
capacitor provides an RC filter for noise reduction.
Figure 24. Temperature Sensor Connection Diagram
To use an external reference along with the internal buffer,
PDREF should be HIGH and PDBUF should be LOW. This
powers down the internal reference and allows the 2.5 V
reference to be applied to REFBUFIN.
ADG779
AD8021
CC
02965-0-024
ANALOG INPUT
(UNIPOLAR)
AD7652
IN
TEMPERATURE
SENSOR
TEMP
To use an external reference directly on REF pin, PDREF and
PDBUF should both be HIGH.
PDREF and PDBUF respectively power down the internal
reference and the internal reference buffer. Note that the PDREF
and PDBUF input current should never exceed 20 mA. This
could eventually occur when input voltage is above AVDD (for
instance at power up). In this case, a 100 series resistor is
recommended.
Power Supply
The AD7652 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
. The AD7652 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.
The internal reference is temperature compensated to 2.5 V ±
20 mV. The reference is trimmed to provide a typical drift of 7
. This typical drift characteristic is shown in
For improved drift performance, an external reference such as
the AD780 can be used.
The AD7652 voltage reference input REF has a dynamic input
impedance; it should therefore be driven by a low impedance
source with efficient decoupling between the REF and REFGND
inputs. This decoupling depends on the choice of the voltage
reference but usually consists of a low ESR capacitor connected
to REF and REFGND with minimum parasitic inductance. A
10 F (X5R, 1206 size) ceramic chip capacitor (or 47 F tanta-
lum capacitor) is appropriate when using either the internal
reference or one of these recommended reference voltages:
The low noise, low temperature drift ADR421 and AD780
The low power ADR291
The low cost AD1582
Rev. 0 | Page 18 of 28
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參數(shù)描述
EVAL-AD7652EDZ 功能描述:BOARD EVAL FOR AD7652 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 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-AD7653CB 制造商:Analog Devices 功能描述:Development Tools, 16Bit 1MSPS SAR Unipolar ADC with Ref 制造商:Analog Devices 功能描述:DEV TOOLS, 16BIT 1MSPS SAR UNIPOLAR ADC W/ REF - Bulk
EVAL-AD7653CBZ 功能描述:BOARD EVALUATION FOR AD7653 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 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-AD7653EDZ 功能描述:BOARD EVAL FOR AD7653 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 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-AD7654CB 制造商:Analog Devices 功能描述:
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