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参数资料
| 型号： | AD9245BCPZRL7-20 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/32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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Data Sheet
AD9245
Rev. E | Page 21 of 32
As detailed in Table 11, the data format can be selected for either
offset binary or twos complement.
TIMING
The AD9245 provides latched data outputs with a pipeline delay
of seven clock cycles. Data outputs are available one propagation
delay (tPD) after the rising edge of the clock signal. Refer to
Figure 2 for a detailed timing diagram.
The length of the output data lines and the loads placed on
them should be minimized to reduce transients within the
AD9245. These transients can degrade the converter’s dynamic
performance.
The lowest typical conversion rate of the AD9245 is 1 MSPS. At
clock rates below 1 MSPS, dynamic performance can degrade.
VOLTAGE REFERENCE
A stable and accurate 0.5 V voltage reference is built into the
AD9245. The input range can be adjusted by varying the
reference voltage applied to the AD9245 using either the
internal reference or an externally applied reference voltage.
The input span of the ADC tracks reference voltage changes
linearly. The various reference modes are summarized in Table 10
and described in the following sections.
If the ADC is being driven differentially through a transformer,
the reference voltage can be used to bias the center tap
(common-mode voltage).
INTERNAL REFERENCE CONNECTION
A comparator within the AD9245 detects the potential at the
SENSE pin and configures the reference into one of four
possible states, which are summarized in Table 10. If SENSE is
grounded, the reference amplifier switch is connected to the
internal resistor divider (see Figure 45), setting VREF to 1 V.
Connecting the SENSE pin to VREF switches the reference
amplifier output to the SENSE pin, completing the loop and
providing a 0.5 V reference output. If a resistor divider is
connected as shown in Figure 47, the switch is again set to the
SENSE pin. This puts the reference amplifier in a noninverting
mode with the VREF output defined as
R1
R2
VREF
1
5
.
0
In all reference configurations, REFT and REFB drive the A/D
conversion core and establish its input span. The input range of
the ADC always equals twice the voltage at the reference pin for
either an internal or an external reference.
03583-017
10
F
+
0.1
F
VREF
SENSE
0.5V
AD9245
VIN–
VIN+
REFT
0.1
F
0.1
F
10
F
0.1
F
REFB
SELECT
LOGIC
ADC
CORE
+
Figure 45. Internal Reference Configuration
If the internal reference of the AD9245 is used to drive multiple
converters to improve gain matching, the loading of the reference
by the other converters must be considered. Figure 46 depicts
how the internal reference voltage is affected by loading. A
2 mA load is the maximum recommended load.
LOAD (mA)
ERROR
(
%
)
0.05
0
0.5
1.0
1.5
2.0
2.5
3.0
0358
3-
019
0
–0.25
–0.20
–0.15
–0.10
–0.05
0.5V ERROR (%)
1.0V ERROR (%)
Figure 46. VREF Accuracy vs. Load
Table 10. Reference Configuration Summary
Selected Mode
SENSE Voltage
Resulting VREF (V)
Resulting Differential Span (V p-p)
External Reference
AVDD
N/A
2 × External Reference
Internal Fixed Reference
VREF
0.5
1.0
Programmable Reference
0.2 V to VREF
R1
R2
1
0.5
2 × VREF
Internal Fixed Reference
AGND to 0.2 V
1.0
2.0
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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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