- 您现在的位置：买卖IC网 > PDF目录10663 > AD9241ASZ (Analog Devices Inc)IC ADC 14BIT 1.25MSPS 44-MQFP PDF资料下载
参数资料
| 型号： | AD9241ASZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 1.25MSPS 44-MQFP |
| 标准包装： | 1 |
| 位数： | 14 |
| 采样率（每秒）： | 1.25M |
| 数据接口： | 并联 |
| 转换器数目： | 7 |
| 功率耗散（最大）： | 85mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
| 产品目录页面： | 780 (CN2011-ZH PDF) |
AD9241
REV. 0
–17–
deliberately left small to minimize the reference noise contribu-
tion. As a result, it is not possible to change the reference volt-
age rapidly in this mode without removing the CAPT/CAPB
Decoupling Network and driving these pins directly.
Variable Input Span with VCM = 2.5 V
Figure 39 shows an example of the AD9241 configured for an
input span of 2
× VREF centered at 2.5 V. An external 2.5 V
reference drives the VINB pin thus setting the common-mode
voltage at 2.5 V. The input span can be independently set by a
voltage divider consisting of R1 and R2, which generates the
VREF signal. A1 buffers this resistor network and drives VREF.
Choose this op amp based on accuracy requirements. It is
essential that a minimum of a 10
F capacitor in parallel with a
0.1
F low inductance ceramic capacitor decouple the reference
output to ground.
2.5V+VREF
2.5V–VREF
2.5V
+5V
0.1F
22F
VINA
VINB
VREF
SENSE
AD9241
+5V
R2
0.1F
A1
R1
0.1F
2.5V
REF
Figure 39. External Reference, VCM = 2.5 V (2.5 V on VINB,
Resistor Divider to Make VREF)
Single-Ended Input with 0 to 2
VREF Range
Figure 40 shows an example of an external reference driving
both VINB and VREF. In this case, both the common mode
voltage and input span are directly dependent on the value of
VREF. More specifically, the common-mode voltage is equal to
VREF while the input span is equal to 2
× VREF. Thus, the
valid input range extends from 0 to 2
× VREF. For example, if
the REF191, a 2.048 external reference, was selected, the valid
input range extends from 0 V to 4.096 V. In this case, 1 LSB of
the AD9241 corresponds to 0.250 mV. It is essential that a
minimum of a 10
F capacitor in parallel with a 0.1 F low induc-
tance ceramic capacitor decouple the reference output to ground.
2xREF
0V
+5V
10F
VINA
VINB
VREF
SENSE
AD9241
+5V
0.1F
VREF
0.1F
Figure 40. Input Range = 0 V to 2
× VREF
Low Cost/Power Reference
The external reference circuit shown in Figure 41 uses a low
cost 1.225 V external reference (e.g., AD580 or AD1580) along
with an op amp and transistor. The 2N2222 transistor acts in
conjunction with 1/2 of an OP282 to provide a very low imped-
ance drive for VINB. The selected op amp need not be a high
speed op amp and may be selected based on cost, power and
accuracy.
3.75V
1.25V
+5V
10F
VINA
VINB
VREF
SENSE
AD9241
+5V
0.1F
316
1k
0.1F
1/2
OP282
10F
0.1F
7.5k
AD1580
1k
1k
820
+5V
2N2222
1.225V
Figure 41. External Reference Using the AD1580 and Low
Impedance Buffer
DIGITAL INPUTS AND OUTPUTS
Digital Outputs
The AD9241 output data is presented in positive true straight
binary for all input ranges. Table IV indicates the output data
formats for various input ranges, regardless of the selected input
range. A twos-complement output data format can be created
by inverting the MSB.
Table IV. Output Data Format
Input (V)
Condition (V)
Digital Output
OTR
VINA –VINB
< – VREF
00 0000 0000 0000 1
VINA –VINB
= – VREF
00 0000 0000 0000 0
VINA –VINB
= 0
10 0000 0000 0000 0
VINA –VINB
= + VREF – 1 LSB 11 1111 1111 1111 0
VINA –VINB
≥ + VREF
11 1111 1111 1111 1
111111 1111 1111
111111 1111 1110
OTR
–FS
+FS
–FS+1/2 LSB
+FS –1/2 LSB
–FS –1/2 LSB
+FS –1 1/2 LSB
000000 0000 0001
000000 0000 0000
1
0
1
OTR DATA OUTPUTS
Figure 42. Output Data Format
Out Of Range (OTR)
An out-of-range condition exists when the analog input voltage
is beyond the input range of the converter. OTR is a digital
output that is updated along with the data output corresponding
to the particular sampled analog input voltage. Hence, OTR has
the same pipeline delay (latency) as the digital data. It is LOW
when the analog input voltage is within the analog input range.
相关PDF资料 |
PDF描述 |
|---|---|
| MAX9140EUK-T | IC COMPARATOR SGL R-R LP SOT23-5 |
| MAX919EUK/V+T | IC COMPARATOR NANO 1.8V SOT23-5 |
| AD9224ARSZ | IC ADC 12BIT 40MSPS 28-SSOP |
| AD9238BSTZ-40 | IC ADC 12BIT DUAL 40MSPS 64-LQFP |
| VI-J13-MW-F2 | CONVERTER MOD DC/DC 24V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9241ASZRL | 功能描述:IC ADC 14BIT SGL 1.25MSPS 44MQFP 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 |
| AD9241EB | 制造商:AD 制造商全称:Analog Devices 功能描述:Complete 14-Bit, 1.25 MSPS Monolithic A/D Converter |
| AD9241-EB | 制造商:Analog Devices 功能描述:Evaluation Board For AD9241 制造商:Analog Devices 功能描述:EVAL BD FOR AD9241 - Bulk |
| AD9243 | 制造商:AD 制造商全称:Analog Devices 功能描述:Complete 14-Bit, 3.0 MSPS Monolithic A/D Converter |
发布紧急采购，3分钟左右您将得到回复。