参数资料
型号: AD9231BCPZRL7-40
厂商: Analog Devices Inc
文件页数: 18/36页
文件大小: 0K
描述: IC ADC 12BIT 40MSPS 64LFCSP
标准包装: 750
位数: 12
采样率(每秒): 40M
数据接口: 串行,SPI?
转换器数目: 2
功率耗散(最大): 103mW
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: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 带卷 (TR)
输入数目和类型: 4 个单端,单极;2 个差分,单极
AD9231
Rev. A | Page 25 of 36
Jitter Considerations
High speed, high resolution ADCs are sensitive to the quality
of the clock input. The degradation in SNR from the low fre-
quency SNR (SNRLF) at a given input frequency (fINPUT) due to
jitter (tJRMS) can be calculated by
SNRHF = 10 log[(2π × fINPUT × tJRMS)2 + 10
]
)
10
/
(
LF
SNR
In the previous equation, the rms aperture jitter represents the
clock input jitter specification. IF undersampling applications
are particularly sensitive to jitter, as illustrated in Figure 56.
80
75
70
65
60
55
50
45
1
10
100
1k
FREQUENCY (MHz)
S
NR
(
d
BF
S
)
0.5ps
0.2ps
0.05ps
1.0ps
1.5ps
2.0ps
2.5ps
3.0ps
0
812
1-
0
22
Figure 56. SNR vs. Input Frequency and Jitter
The clock input should be treated as an analog signal in cases in
which aperture jitter may affect the dynamic range of the AD9231.
To avoid modulating the clock signal with digital noise, keep
power supplies for clock drivers separate from the ADC output
driver supplies. 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.
For more information, see the AN-501 Application Note and the
AN-756 Application Note available on www.analog.com.
CHANNEL/CHIP SYNCHRONIZATION
The AD9231 has a SYNC input that offers the user flexible
synchronization options for synchronizing sample clocks
across multiple ADCs. The input clock divider can be enabled
to synchronize on a single occurrence of the SYNC signal or on
every occurrence. The SYNC input is internally synchronized
to the sample clock; however, to ensure there is no timing
uncertainty between multiple parts, the SYNC input signal should
be externally synchronized to the input clock signal, meeting the
setup and hold times shown in Table 5. Drive the SYNC input
using a single-ended CMOS-type signal.
POWER DISSIPATION AND STANDBY MODE
As shown in Figure 57, the analog core power dissipated by
the AD9231 is proportional to its sample rate. The digital
power dissipation of the CMOS outputs are determined
primarily by the strength of the digital drivers and the load
on each output bit.
The maximum DRVDD current (IDRVDD) can be calculated as
IDRVDD = VDRVDD × CLOAD × fCLK × N
where N is the number of output bits (26, in the case of the
AD9231).
This maximum current occurs when every output bit switches
on every clock cycle, that is, a full-scale square wave at the Nyquist
frequency of fCLK/2. In practice, the DRVDD current is estab-
lished by the average number of output bits switching, which
is determined by the sample rate and the characteristics of the
analog input signal.
Reducing the capacitive load presented to the output drivers can
minimize digital power consumption. The data in Figure 57 was
taken using the same operating conditions as those used for the
output driver.
50
70
90
110
130
150
0
1020304050
60
708
A
NAL
O
G
CO
RE
P
O
W
E
R
(
m
W
)
CLOCK RATE (MSPS)
0
AD9231-20
AD9231-40
AD9231-65
AD9231-80
08
12
1-
07
9
Figure 57. Analog Core Power vs. Clock Rate
相关PDF资料
PDF描述
CS6422-CS IC CODEC SPKRPHONE 2CH 20-SOIC
AD9649BCPZRL7-20 IC ADC 14BIT 20MSPS 32LFCSP
CXS3102A2027P CONN RCPT 14POS PNL MNT PIN
SP3239ECA-L/TR IC TXRX RS232 INTELLIGENT 28SSOP
MS27467T11F98PD CONN PLUG 6POS STRAIGHT W/PINS
相关代理商/技术参数
参数描述
AD9231BCPZRL7-65 功能描述:IC ADC 12BIT 65MSPS 64LFCSP 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
AD9231BCPZRL7-80 功能描述:IC ADC 12BIT 80MSPS 64LFCSP 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
AD9233 制造商:AD 制造商全称:Analog Devices 功能描述:12-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Analog-to-Digital Converter
AD9233-105EB 制造商:AD 制造商全称:Analog Devices 功能描述:12-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Analog-to-Digital Converter
AD9233-105EBZ 制造商:Analog Devices 功能描述: