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參數(shù)資料
| 型號(hào)： | AD6645ASVZ-105 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 105MSPS 52TQFP |
| 設(shè)計(jì)資源： | Low Jitter Sampling Clock Generator for High Performance ADCs Using AD9958/9858 and AD9515 (CN0109) |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 105M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 4 |
| 功率耗散（最大）： | 1.75W |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -10°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 52-TQFP 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 52-TQFP-EP（10x10） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 1 個(gè)差分，雙極 |
AD6645
Rev. D | Page 19 of 24
LAYOUT INFORMATION
The schematic of the evaluation board (see Figure 43)
represents a typical implementation of the AD6645. A multi-
layer board is recommended to achieve best results. It is highly
recommended that high quality, ceramic chip capacitors be
used to decouple each supply pin to ground directly at the
device. The pinout of the AD6645 facilitates ease of use in the
implementation of high frequency, high resolution design practices.
All of the digital outputs are segregated to two sides of the chip,
with the inputs on the opposite side for isolation purposes.
Care should be taken when routing the digital output traces. To
prevent coupling through the digital outputs into the analog
portion of the AD6645, minimal capacitive loading should be
placed on these outputs. It is recommended that a fanout of
only one gate should be used for all AD6645 digital outputs.
The layout of the encode circuit is equally critical. Any noise
received on this circuitry results in corruption in the digitization
process and lower overall performance. The encode clock must be
isolated from the digital outputs and the analog inputs.
Table 8. Twos Complement Output Coding
AIN Level
Output State
Output Code
VREF + 0.55 V
VREF 0.55 V
Positive FS
01 1111 1111 1111
VREF
Midscale
00 … 0/11 … 1
VREF 0.55 V
VREF + 0.55 V
Negative FS
10 0000 0000 0000
JITTER CONSIDERATIONS
The SNR for an ADC can be predicted. When normalized to
ADC codes, the following equation accurately predicts the SNR
based on three terms: jitter, average DNL error, and thermal
noise. Each of these terms contributes to the noise within the
converter.
()
2
/
1
2
ε
1
2
log
20
76
.
1
×
+
+
+
×
π
=
n
rms
NOISE
n
rms
j
ANALOG
V
t
f
SNR
where:
fANALOG is the analog input frequency.
tj rms is the rms jitter of the encode (rms sum of encode source
and internal encode circuitry).
ε is the average DNL of the ADC (typically 0.41 LSB).
n is the number of bits in the ADC.
VNOISE rms is the voltage rms thermal noise that refers to the
analog input of the ADC (typically 0.9 LSB rms).
For a 14-bit ADC, such as the AD6645, aperture jitter can
greatly affect the SNR performance as the analog frequency is
increased. Figure 42 shows a family of curves that demonstrate the
expected SNR performance of the AD6645 as jitter increases.
The chart is derived from the preceding equation.
For a complete discussion of aperture jitter, see the AN-756
application note, Sampled Systems and the Effects of Clock Phase
Noise and Jitter. The AN-756 application note can be found on
JITTER (ps)
55
S
NR
(
d
B
F
S
)
60
65
70
75
80
AIN = 110MHz
AIN = 150MHz
AIN = 190MHz
AIN = 30MHz
AIN = 70MHz
0
0.1
0.2
0.3
0.4
0.5
0.6
02
64
7-
04
2
Figure 42. SNR vs. Jitter
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD6645ASVZ-1051 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 80 MSPS/105 MSPS A/D Converter |
| AD6645ASVZ-80 | 功能描述:IC ADC 14BIT 80MSPS 52TQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD6645ASVZ-80 | 制造商:Analog Devices 功能描述:ADC, 14BIT, 80MSPS, TQFP-52 |
| AD6645ASVZ-801 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 80 MSPS/105 MSPS A/D Converter |
| AD6645-MIL/PCB | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 AD6645-MIL/PCB EVAL. BD. RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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