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参数资料
| 型号： | AD9245BCPZRL7-20 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT SGL 20MSPS 32LFCSP |
| 标准包装： | 1,500 |
| 位数： | 14 |
| 采样率（每秒）： | 20M |
| 数据接口： | 并联 |
| 转换器数目： | 3 |
| 功率耗散（最大）： | 90mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ（5x5） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
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AD9245
Data Sheet
Rev. E | Page 22 of 32
03583-018
10
F
+
0.1
F
VREF
SENSE
R2
R1
0.5V
AD9245
VIN–
VIN+
REFT
0.1
F
0.1
F
10
F
0.1
F
REFB
SELECT
LOGIC
ADC
CORE
+
Figure 47. Programmable Reference Configuration
EXTERNAL REFERENCE OPERATION
The use of an external reference can be necessary to enhance
the gain accuracy of the ADC or improve thermal drift char-
acteristics. When multiple ADCs track one another, a single
reference (internal or external) can be necessary to reduce
gain matching errors to an acceptable level. Figure 48 shows
the typical drift characteristics of the internal reference in both
1.0 V and 0.5 V modes.
When the SENSE pin is tied to AVDD, the internal reference is
disabled, allowing the use of an external reference. An internal
reference buffer loads the external reference with an equivalent
7 kΩ load. The internal buffer still generates the positive and
negative full-scale references, REFT and REFB, for the ADC
core. The input span is always twice the value of the reference
voltage; therefore, the external reference must be limited to a
maximum of 1.0 V.
TEMPERATURE (°C)
VREF
ERROR
(%)
–40
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
80
70
60
50
40
30
20
10
0
–10
–20
–30
0358
3-
040
VREF = 0.5V
VREF = 1.0V
Figure 48. Typical VREF Drift
OPERATIONAL MODE SELECTION
As discussed earlier, the AD9245 can output data in either
offset binary or twos complement format. There is also a
provision for enabling or disabling the clock DCS. The
MODE pin is a multilevel input that controls the data format
and DCS state. The input threshold values and corresponding
mode selections are outlined in Table 11.
Table 11. Mode Selection
MODE Voltage
Data Format
Duty Cycle Stabilizer
AVDD
Twos Complement
Disabled
2/3 AVDD
Twos Complement
Enabled
1/3 AVDD
Offset Binary
Enabled
AGND (Default)
Offset Binary
Disabled
EVALUATION BOARD
The AD9245 evaluation board provides the support circuitry
required to operate the ADC in its various modes and
configurations. Complete schematics and layout plots follow
and demonstrate the proper routing and grounding techniques
that should be applied at the system level.
It is critical that signal sources with very low phase noise
(<1 ps rms jitter) be used to realize the ultimate performance of
the converter. Proper filtering of the input signal, to remove
harmonics and lower the integrated noise at the input, is also
necessary to achieve the specified noise performance.
The AD9245 can be driven single-ended or differentially
through a transformer. Separate power pins are provided to
isolate the DUT from the support circuitry. Each input
configuration can be selected by proper connection of
various jumpers (refer to the schematics).
An alternative differential analog input path using an
AD8351 op amp is included in the layout but is not populated
in production. Designers interested in evaluating the op amp
with the ADC should remove C15, R12, and R3 and populate
the op amp circuit. The passive network between the AD8351
outputs and the AD9245 allows the user to optimize the
frequency response of the op amp for the application.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9245BCPZRL7-202 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 3 V A/D Converter |
| AD9245BCPZRL7-40 | 功能描述:IC ADC 14BIT SGL 40MSPS 32LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD9245BCPZRL7-402 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 3 V A/D Converter |
| AD9245BCPZRL7-65 | 功能描述:IC ADC 14BIT SGL 65MSPS 32LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD9245BCPZRL7-652 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 3 V A/D Converter |
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