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参数资料
| 型号： | AD9058AKJ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT DUAL 50MSPS 44-JLCC |
| 标准包装： | 1 |
| 位数： | 8 |
| 采样率（每秒）： | 50M |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 960mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-JLCC（16.39x16.39） |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，单极；2 个单端，双极 |
REV.
AD9058
–8–
AD9058 in through-hole PCB designs, use the AD9058AJD/AKD
with individual pin sockets (AMP Part No. 6-330808-0). Alterna-
tively, surface-mount AD9058 units can be mounted in a
through-hole socket (Circuit Assembly Corporation, Irvine, Cali-
fornia Part No. CA-44SPC-T).
AD9058 APPLICATIONS
Combining two ADCs in a single package is an attractive alterna-
tive in a variety of systems when cost, reliability, and space are
important considerations. Different systems emphasize particular
specifications, depending on how the part is used.
In high density digital radio communications, a pair of high
speed ADCs are used to digitize the in-phase (I) and quadrature
(Q) components of a modulated signal. The signal presented to
each ADC in this type of system consists of message-dependent
amplitudes varying at the symbol rate, which is equal to the
sample rates of the converters.
t
A = APERTURE TIME
t
V = DATA DELAY OF PRECEDING ENCODE
t
PD = OUTPUT PROPAGATION DELAY
ANALOG
INPUT
ENCODE
D0–D7
VALID DATA
FOR N–1
VALID DATA
FOR N
VALID DATA
FOR N+1
DATA
CHANGING
t
V
t
A
N
N+1
N+2
t
PD
Figure 4. Timing Diagram
Figure 5 shows what the analog input to the AD9058 would
look like when observed relative to the sample clock. Signal-to-
noise ratio (SNR), transient response, and sample rate are all
critical specifications in digitizing this “eye pattern.”
ANALOG
INPUT
SAMPLE
CLOCK
Figure 5. I and Q Input Signals
Receiver sensitivity is limited by the SNR of the system. For the
ADC, SNR is measured in the frequency domain and calculated
with a Fast Fourier Transform (FFT). The signal-to-noise ratio
equals the ratio of the fundamental component of the signal
(rms amplitude) to the rms level of the noise. Noise is the sum
of all other spectral components, including harmonic distortion,
but excluding dc.
Although the signal being sampled does not have a significant
slew rate at the instant it is encoded, dynamic performance of
the ADC and the system is still critical. Transient response is
the time required for the AD9058 to achieve full accuracy when
a step function input is applied. Overvoltage recovery time is the
interval required for the AD9058 to recover to full accuracy after an
overdriven analog input signal is reduced to its input range.
Time domain performance of the ADC is also extremely important
in digital oscilloscopes. When a track-/sample-and-hold is used
ahead of the ADC, its operation becomes similar to that described
above for receivers.
The dynamic response to high frequency inputs can be described by
the effective number of bits (ENOB). The effective number of
bits is calculated with a sine wave curve fit and is expressed as:
ENOB
N
LOG
Error measured
Error ideal
=
()
( )
[]
2
where N is the resolution (number of bits) and measured error is
actual rms error calculated from the converter’s outputs with
a pure sine wave applied as the input.
Maximum conversion rate is defined as the encode (sample)
rate at which SNR of the lowest frequency analog test signal
drops no more than 3 dB below the guaranteed limit.
HARMONIC
DIST
OR
TION
–
dB
60
55
50
45
40
35
INPUT FREQUENCY – MHz
0.1
1
10
100
30
+25 C
–55 C
+125 C
Figure 6. Harmonic Distortion vs. Analog Input Frequency
SIGNAL-T
O-NOISE
RA
TIO
(SNR)
–
dB
55
50
45
40
35
INPUT FREQUENCY – MHz
0.1
1
10
100
30
+25 C AND +125 C
–55 C
EFFECTIVE
NUMBER
OF
BITS
(ENOB)
8.0
7.2
6.4
5.5
Figure 7. Dynamic Performance vs. Analog Input
Frequency
E
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9058ATD/883B | 功能描述:模数转换器 - ADC Dual 8-Bit 50 MSPS RoHS:否 制造商:Analog Devices 通道数量: 结构: 转换速率: 分辨率: 输入类型: 信噪比: 接口类型: 工作电源电压: 最大工作温度: 安装风格: 封装 / 箱体: |
| AD9058ATD883B | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual 8-Bit 50 MSPS A/D Converter |
| AD9058ATJ | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual 8-Bit 50 MSPS A/D Converter |
| AD9058ATJ/883B | 制造商:Analog Devices 功能描述:ADC Dual Flash 50Msps 8-bit Parallel 44-Pin JLCC 制造商:Analog Devices 功能描述:ADC DUAL FLASH 50MSPS 8BIT PARALLEL 44PIN JLCC - Rail/Tube 制造商:Analog Devices 功能描述:IC 8-BIT ADC |
| AD9058ATJ883B | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual 8-Bit 50 MSPS A/D Converter |
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