- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1893 > AD9276BSVZ (Analog Devices Inc)IC ADC 12BIT LNA/VGA/AAF 100TQFP PDF資料下載
參數(shù)資料
| 型號： | AD9276BSVZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 22/48頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT LNA/VGA/AAF 100TQFP |
| 標準包裝： | 1 |
| 類型： | AAF，ADC，解調(diào)器，LNA，VGA |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 10M ~ 80M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 電壓電源： | 模擬和數(shù)字 |
| 電源電壓： | 1.8V，3V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 100-TQFP 裸露焊盤 |
| 供應商設備封裝： | 100-TQFP-EP（14x14） |
| 包裝： | 托盤 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第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頁當前第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頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁
AD9276
Rev. 0 | Page 29 of 48
TGC OPERATION
The TGC signal path is fully differential throughout to maxi-
mize signal swing and reduce even-order distortion; however,
the LNAs are designed to be driven from a single-ended signal
source. Gain values are referenced from the single-ended LNA
input to the differential ADC input. A simple exercise in under-
standing the maximum and minimum gain requirements is
shown in Figure 55.
The maximum gain required is determined by
(ADC Noise Floor/LNA Input Noise Floor) + Margin =
20 log(224/3.9) + 11 dB = 46 dB
The minimum gain required is determined by
(ADC Input FS/LNA Input FS) + Margin =
20 log(2/0.55) 10 dB = 3 dB
Therefore, 42 dB of gain range for a 12-bit, 40 MSPS ADC with
15 MHz of bandwidth should suffice in achieving the dynamic
range required for most of today’s ultrasound systems.
The system gain is distributed as listed in Table 9.
Table 9. Channel Gain Distribution
Section
Nominal Gain (dB)
LNA
15.6/17.9/21.3
Attenuator
42 to 0
VGA Amplifier
21/24/27/30
Filter
0
ADC
0
The linear-in-dB gain (law conformance) range of the TGC path
is 42 dB. The slope of the gain control interface is 28.5 dB/V,
and the gain control range is 0.8 V to +0.8 V. Equation 3 is the
expression for the differential voltage VGAIN, and Equation 4 is
the expression for the channel gain.
VGAIN (V) = (GAIN+) – (GAIN)
(3)
Gain (dB) = 28.5 dB/V × VGAIN + ICPT
(4)
where ICPT is the intercept point of the TGC gain.
In its default condition, the LNA has a gain of 21.3 dB (12×), and
the VGA postamp gain is 24 dB if the voltage on the GAIN+ pin
is 0 V and the voltage on the GAIN pin is 0.8 V (42 dB attenua-
tion). This results in a total gain (or ICPT) of 3.6 dB through
the TGC path if the LNA input is unmatched, or a total gain of
2.4 dB if the LNA is matched to 50 Ω (RFB = 350 Ω). However,
if the voltage on the GAIN+ pin is 1.6 V and the voltage on the
GAIN pin is 0.8 V (0 dB attenuation), the VGA gain is 24 dB.
This results in a total gain of 45 dB through the TGC path if the
LNA input is unmatched or in a total gain of 39 dB if the LNA
input is matched.
Each LNA output is dc-coupled to a VGA input. The VGA
consists of an attenuator with a range of 42 dB to 0 dB followed
by an amplifier with 21 dB/24 dB/27 dB/30 dB of gain. The
X-AMP gain interpolation technique results in low gain error
and uniform bandwidth, and differential signal paths minimize
distortion.
LNA FULL SCALE
(0.55V p-p SINGLE-ENDED)
LNA INPUT-REFERRED
NOISE FLOOR
(3.9V rms) @ AAF BW = 15MHz
LNA + VGA NOISE = 1.0nV/ Hz
MINIMUM GAIN
MAXIMUM GAIN
LNA
VGA GAIN RANGE > 42dB
MAX CHANNEL GAIN > 48dB
94dB
08
18
0
-04
9
Figure 55. Gain Requirements of TGC Operation for a 12-Bit, 40 MSPS ADC
相關PDF資料 |
PDF描述 |
|---|---|
| AD9277BSVZ | IC ADC 14BIT LNA/VGA/AAF 100TQFP |
| AD9278BBCZ | IC ADC 12BIT 50MSPS 144CSPBGA |
| AD9279BBCZ | IC ADC 12BIT 80MSPS 144CSPBGA |
| AD9393BBCZRL-80 | IC INTERFACE 80MHZ HDMI 76CSPBGA |
| AD9398KSTZ-150 | IC INTERFACE 150MHZ HDMI 100LQFP |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9276XBCZ | 功能描述:IC ADC 12BIT LNA/VGA/AAF 制造商:analog devices inc. 系列:* 零件狀態(tài):上次購買時間 標準包裝:1 |
| AD9276XSVZ | 功能描述:IC ADC 12BIT LNA/VGA/AAF 制造商:analog devices inc. 系列:* 零件狀態(tài):上次購買時間 標準包裝:1 |
| AD9277 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Octal LNA/VGA/AAF/14-Bit ADC and CW I/Q Demodulator |
| AD9277-50EBZ | 功能描述:BOARD EVAL FOR AD9277 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉換器 (ADC) 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| AD9277BSVZ | 功能描述:IC ADC 14BIT LNA/VGA/AAF 100TQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
發(fā)布緊急采購，3分鐘左右您將得到回復。