參數(shù)資料
型號(hào)： AD9271BSVZ-25
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 1/60頁(yè)
文件大小： 0K
描述： IC ADC OCT 12BIT 25MSPS 100-TQFP
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 12
采樣率（每秒）： 25M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 8
功率耗散（最大）： 1.06W
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： 100-TQFP 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 100-TQFP-EP（14x14）
包裝： 托盤(pán)
輸入數(shù)目和類型： 8 個(gè)單端，單極；8 個(gè)差分，單極
Octal LNA/VGA/AAF/ADC
and Crosspoint Switch
AD9271
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
2007–2009 Analog Devices, Inc. All rights reserved.
FEATURES
8 channels of LNA, VGA, AAF, and ADC
Low noise preamplifier (LNA)
Input-referred noise = 1.1 nV/√Hz @ 5 MHz typical,
gain = 18 dB
SPI-programmable gain = 14 dB/15.6 dB/18 dB
Single-ended input; VIN maximum = 400 mV p-p/
333 mV p-p/250 mV p-p
Dual-mode active input impedance matching
Bandwidth (BW) > 70 MHz
Full-scale (FS) output = 2 V p-p differential
Variable gain amplifier (VGA)
Gain range = 6 dB to +24 dB
Linear-in-dB gain control
Antialiasing filter (AAF)
3rd-order Butterworth cutoff
Programmable from 8 MHz to 18 MHz
Analog-to-digital converter (ADC)
12 bits at 10 MSPS to 50 MSPS
SNR = 70 dB
SFDR = 80 dB
Serial LVDS (ANSI-644, IEEE 1596.3 reduced range link)
Data and frame clock outputs
Includes crosspoint switch to support
continuous wave (CW) Doppler
Low power, 150 mW per channel at 12 bits/40 MSPS (TGC)
90 mW per channel in CW Doppler
Single 1.8 V supply (3.3 V supply for CW Doppler output bias)
Flexible power-down modes
Overload recovery in <10 ns
Fast recovery from low power standby mode, <2 μs
100-lead TQFP
APPLICATIONS
Medical imaging/ultrasound
Automotive radar
GENERAL DESCRIPTION
The AD9271 is designed for low cost, low power, small size,
and ease of use. It contains eight channels of a variable gain amp-
lifier (VGA) with low noise preamplifier (LNA); an antialiasing
filter (AAF); and a 12-bit, 10 MSPS to 50 MSPS analog-to-digital
converter (ADC).
Each channel features a variable gain range of 30 dB, a fully
differential signal path, an active input preamplifier termination, a
maximum gain of up to 40 dB, and an ADC with a conversion
rate of up to 50 MSPS. The channel is optimized for dynamic
performance and low power in applications where a small
package size is critical.
FUNCTIONAL BLOCK DIAGRAM
SER
IA
L
PO
RT
IN
TE
R
F
A
C
E
REFERENCE
FCO+
FCO–
DCO+
DCO–
LNA
LO-H
LOSW-H
LI-H
LG-H
12-BIT
ADC
SERIAL
LVDS
DOUTH+
DOUTH–
LNA
LO-G
LOSW-G
LI-G
LG-G
12-BIT
ADC
SERIAL
LVDS
DOUTG+
DOUTG–
LNA
LO-F
LOSW-F
LI-F
LG-F
12-BIT
ADC
SERIAL
LVDS
DOUTF+
DOUTF–
LNA
LO-E
LOSW-E
LI-E
LG-E
12-BIT
ADC
SERIAL
LVDS
DOUTE+
DOUTE–
LNA
LO-D
LOSW-D
LI-D
LG-D
12-BIT
ADC
SERIAL
LVDS
DOUTD+
DOUTD–
LNA
LO-C
LOSW-C
LI-C
LG-C
12-BIT
ADC
SERIAL
LVDS
DOUTC+
DOUTC–
LNA
LO-B
LOSW-B
LI-B
LG-B
LNA
LO-A
LOSW-A
LI-A
LG-A
12-BIT
ADC
SERIAL
LVDS
DOUTB+
DOUTB–
12-BIT
ADC
SERIAL
LVDS
DOUTA+
DOUTA–
AV
D
ST
BY
DR
V
DD
PDW
N
CL
K
–
CL
K
+
SD
IO
SCL
K
CSB
RB
IAS
RE
F
T
RE
F
B
VR
EF
SE
N
SE
GA
IN
+
GA
IN
–
C
W
D[5:
0]+
/–
CW
V
D
SWITCH
ARRAY
DA
T
A
RAT
E
M
U
LT
IP
LI
E
R
06
304-
0
01
AAF
AD9271
VGA
Figure 1.
The LNA has a single-ended-to-differential gain that is selectable
through the SPI. The LNA input noise is typically 1.2 nV/√Hz,
and the combined input-referred noise of the entire channel
is 1.4 nV/√Hz at maximum gain. Assuming a 15 MHz noise
bandwidth (NBW) and a 15.6 dB LNA gain, the input SNR is
roughly 86 dB. In CW Doppler mode, the LNA output drives a
transconductance amp that is switched through an 8 × 6
differential crosspoint switch. The switch is programmable
through the SPI.
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