- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1986 > AD9235BRURL7-40 (Analog Devices Inc)IC ADC 12BIT SGL 40MSPS 28TSSOP PDF資料下載
參數(shù)資料
| 型號： | AD9235BRURL7-40 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT SGL 40MSPS 28TSSOP |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標準包裝： | 1,000 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 40M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 3 |
| 功率耗散（最大）： | 165mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 28-TSSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 2 個單端，單極；1 個差分，單極 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁當前第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁
AD9235
Data Sheet
Rev. D | Page 16 of 40
The internal voltage reference can be pin-strapped to fixed
values of 0.5 V or 1.0 V, or adjusted within the same range as
discussed in the Internal Reference Connection section. Maxi-
mum SNR performance is achieved with the AD9235 set to the
largest input span of 2 V p-p. The relative SNR degradation is
3 dB when changing from 2 V p-p mode to 1 V p-p mode.
The SHA may be driven from a source that keeps the signal
peaks within the allowable range for the selected reference volt-
age. The minimum and maximum common-mode input levels
are defined as:
VCMMIN = VREF/2
VCMMAX = (AVDD + VREF)/2
The minimum common-mode input level allows the AD9235 to
accommodate ground-referenced inputs.
Although optimum performance is achieved with a differential
input, a single-ended source may be driven into VIN+ or VIN–.
In this configuration, one input accepts the signal, while the
opposite input should be set to midscale by connecting it to an
appropriate reference. For example, a 2 V p-p signal may be
applied to VIN+ while a 1 V reference is applied to VIN–. The
AD9235 then accepts an input signal varying between 2 V and
0 V. In the single-ended configuration, distortion performance
may degrade significantly as compared to the differential case.
However, the effect is less noticeable at lower input frequencies and
in the lower speed grade models (AD9235-40 and AD9235-20).
Differential Input Configurations
As previously detailed, optimum performance is achieved while
driving the AD9235 in a differential input configuration. For
baseband applications, the AD8138 differential driver provides
excellent performance and a flexible interface to the ADC. The
output common-mode voltage of the AD8138 is easily set to
AVDD/2, and the driver can be configured in a Sallen-Key filter
topology to provide band limiting of the input signal.
AD9235
VIN+
VIN–
AVDD
1Vp-p
49.9
523
1k
1k
0.1
F
22
22
15pF
499
499
499
AGND
02461-035
AD8138
Figure 35. Differential Input Configuration Using the AD8138
At input frequencies in the second Nyquist zone and above, the
performance of most amplifiers is not adequate to achieve the
true performance of the AD9235. This is especially true in IF
undersampling applications where frequencies in the 70 MHz to
100 MHz range are being sampled. For these applications,
differential transformer coupling is the recommended input
configuration, as shown in Figure 36.
02461-036
AD9235
VIN+
VIN–
AVDD
49.9
22
22
15pF
AGND
1k
1k
0.1
F
2Vp-p
Figure 36. Differential Transformer-Coupled Configuration
The signal characteristics must be considered when selecting a
transformer. Most RF transformers saturate at frequencies
below a few MHz, and excessive signal power can also cause
core saturation, which leads to distortion.
Single-Ended Input Configuration
A single-ended input may provide adequate performance in
cost-sensitive applications. In this configuration, there is degra-
dation in SFDR and in distortion performance due to the large
input common-mode swing. However, if the source
impedances on each input are matched, there should be little
effect on SNR performance. Figure 37 details a typical single-
ended input configuration.
02461-037
AD9235
VIN+
VIN–
AVDD
49.9
22
22
15pF
AGND
1k
1k
1k
1k
2Vp-p
0.33
F
0.1
F
10
F
Figure 37. Single-Ended Input Configuration
CLOCK INPUT CONSIDERATIONS
Typical high speed ADCs use both clock edges to generate a
variety of internal timing signals, and as a result, may be sensi-
tive to clock duty cycle. Commonly a 5% tolerance is required
on the clock duty cycle to maintain dynamic performance char-
acteristics. The AD9235 contains a clock duty cycle stabilizer
(DCS) that retimes the nonsampling edge, providing an internal
clock signal with a nominal 50% duty cycle. This allows a wide
range of clock input duty cycles without affecting the perfor-
mance of the AD9235. As shown in Figure 30, noise and distor-
tion performance are nearly flat over a 30% range of duty cycle.
The duty cycle stabilizer uses a delay-locked loop (DLL) to
create the nonsampling edge. As a result, any changes to the
sampling frequency require approximately 100 clock cycles to
allow the DLL to acquire and lock to the new rate.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9236BRUZRL7-80 | IC ADC 12BIT 80MSPS 28TSSOP |
| AD9237BCPZ-20 | IC ADC 12BIT SGL 20MSPS 32LFCSP |
| AD9238BSTRL-65 | IC ADC 12BIT DUAL 65MSPS 64-LQFP |
| AD9239BCPZ-170 | IC ADC 12BIT DUAL 170MSPS 72PIN |
| AD9240AS | IC ADC 14BIT 10MSPS 44-MQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9235BRURL7-65 | 功能描述:IC ADC 12BIT 65MSPS 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD9235BRUZ-20 | 功能描述:IC ADC 12BIT 20MSPS 28-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD9235BRUZ-20 | 制造商:Analog Devices 功能描述:IC, ADC, 12BIT, 20MSPS, TSSOP-28 |
| AD9235BRUZ-40 | 功能描述:IC ADC 12BIT 40MSPS 28-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD9235BRUZ-40 | 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
發(fā)布緊急采購，3分鐘左右您將得到回復。