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| 型号： | EVAL-AD7653CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7653 |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行，并联 |
| 输入范围： | 0 ~ 2.5 V |
| 在以下条件下的电源（标准）： | 92mW @ 666kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7653 |
| 已供物品： | 板 |
| 相关产品： | AD7653ACPZ-ND - IC ADC 16BIT UNIPOLAR 48LFCSP AD7653ACPZRL-ND - IC ADC 16BIT UNIPOLAR 48LFCSP AD7653ASTZRL-ND - IC ADC 16BIT UNIPOLAR 48LQFP AD7653ASTZ-ND - IC ADC 16BIT 1MSPS W/REF 48-LQFP |
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AD7653
Voltage Reference Input
The AD7653 allows the choice of either a very low temperature
drift internal voltage reference or an external 2.5 V reference.
For applications that use multiple AD7653s, it is more effective
to use the internal buffer to buffer the reference voltage.
Unlike many ADCs with internal references, the internal
reference of the AD7653 provides excellent performance and
can be used in almost all applications.
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.
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.
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 output impedance of REFBUFIN is 11 k (minimum) when
the 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.
The TEMP pin, which measures the temperature of the AD7653,
can be used as shown in
. The output of the 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.
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
02966-0-024
ANALOG INPUT
(UNIPOLAR)
AD7653
IN
TEMPERATURE
SENSOR
TEMP
To use an external reference directly on the REF pin, PDREF
and PDBUF should both be HIGH.
PDREF and PDBUF, respectively, power down the internal
reference and the internal reference. 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 AD7653 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 AD7653 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 AD7653 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
tantalum capacitor) is appropriate when using either the
internal reference or one of these recommended reference
voltages:
The low power ADR291
The low cost AD1582
Rev. A | Page 18 of 28
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相关代理商/技术参数 |
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| EVAL-AD7653EDZ | 功能描述:BOARD EVAL FOR AD7653 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7654CB | 制造商:Analog Devices 功能描述: |
| EVAL-AD7654CBZ | 功能描述:BOARD EVALUATION FOR AD7654 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7655CB | 制造商:Analog Devices 功能描述:Evaluation Board For The 48 Lead Pulsar Analog To Digital Converter Family 制造商:Rochester Electronics LLC 功能描述:EVAL BRD LOW COST 4-CH 1 MSPS 16-BIT ADC - Bulk |
| EVAL-AD7655CBZ | 功能描述:BOARD EVALUATION FOR AD7655 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
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