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| 型号： | AD9203ARUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 40MSPS 3V 28-TSSOP |
| 标准包装： | 50 |
| 位数： | 10 |
| 采样率（每秒）： | 40M |
| 数据接口： | 并联 |
| 转换器数目： | 5 |
| 功率耗散（最大）： | 108mW |
| 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： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
| 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) |
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AD9203
Rev. B | Page 16 of 28
–40
–50
–60
–70
–80
–90
40.0
42.5
45.0
47.5
50.0
52.5
55.0
57.5
60.0
00573-031
DUTY CYCLE (%)
THD
(dB)
THD
SNR
Figure 31. THD and SNR vs. Clock Duty Cycle
(fIN = 5 MHz Differential, Clock = 40 MSPS)
Table 5. Power Programming Resistance
Clock MSPS
Resistor Value (k)
1
50
5 to 10
100
15 to 20
200
>20
500
POWER CONTROL
Power consumed by the AD9203 may be reduced by placing a
resistor between the PWRCON pin and ground. This function
will be valuable to users who do not need the AD9203’s high
conversion rate, but do need even lower power consumption.
The external resistor sets the programming of the analog
current mirrors. Table 5 illustrates the relationship between
programmed power and performance.
At lower clock rates, less power is required within the analog
sections of the AD9203. Placing an external resistor on the
PWRCON pin will shunt control current away from some of the
current mirrors. This enables the ADC to convert low data rates
with extremely low power consumption.
INTERFACING TO 5 V SYSTEMS
The AD9203 can be integrated into 5 V systems. This is
accomplished by deriving a 3 V power supply from the existing
5 V analog power line through an AD3307-3 linear regulator.
Care must be maintained so that logic inputs do not exceed the
maximum rated values listed on the Specifications page.
CLOCK INPUT AND CONSIDERATIONS
The AD9203 internal timing uses the two edges of the clock
input to generate a variety of internal timing signals. Sampling
occurs on the falling edge. The clock input to the AD9203
operating at 40 MSPS may have a duty cycle between 45% to
55% to meet this timing requirement since the minimum
specified tCH and tCL is 11.25 ns. For clock rates below 40 MSPS,
the duty cycle may deviate from this range to the extent that
duty cycle.
High-speed, high-resolution A/Ds are sensitive to the quality of
the clock input. The degradation in SNR at a given full-scale
input frequency (fIN) due only to aperture jitter (tA) can be
calculated with the following equation:
SNR degradation = 20 log10 [1/2π fIN tA]
In the equation, the rms aperture jitter, tA, represents the
rootsum square of all the jitter sources, which include the clock
input, analog input signal, and A/D aperture jitter specification.
Undersampling applications are particularly sensitive to jitter.
Clock input should be treated as an analog signal in cases where
aperture jitter may affect the dynamic range of the AD9203.
Power supplies for clock drivers should be separated from the
A/D output driver supplies to avoid modulating the clock signal
with digital noise. Low jitter crystal controlled oscillators make
the best clock sources. If the clock is generated from another
type of source (by gating, dividing or another method), it
should be retimed by the original clock at the last step.
The clock input is referred to the analog supply. Its logic
threshold is AVDD/2.
DIGITAL INPUTS AND OUTPUTS
Each of the AD9203 digital control inputs, 3-STATE, DFS, and
STBY are referenced to analog ground. CLK is also referenced
to analog ground. A low power mode feature is provided such
that for STBY = HIGH and the static power of the AD9203
drops to 0.65 mW.
Asserting the DFS pin high will invert the MSB pin, changing
the data to a twos complement format.
The AD9203 has an OTR (out of range) function. If the input
voltage is above or below full scale by 1 LSB, the OTR flag will
go high. See Figure 32.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9203ARUZ | 制造商:Analog Devices 功能描述:IC ADC 10BIT 40MSPS 28TSSOP |
| AD9203ARUZ | 制造商:Analog Devices 功能描述:IC, ADC, 10BIT, 40MSPS, TSSOP-28 |
| AD9203ARUZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:10-Bit, 40 MSPS, 3 V, 74 mW A/D Converter |
| AD9203ARUZRL7 | 功能描述:IC ADC 10BIT CMOS 40MSPS 28TSSOP 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:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD9203ARUZRL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:10-Bit, 40 MSPS, 3 V, 74 mW A/D Converter |
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