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| 型號： | ADA4950-1YCP-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADA4950-1YCP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 差分 |
| 板類型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 16-LFCSP 封裝 |
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Low Power, Selectable Gain
Differential ADC Driver, G = 1, 2, 3
Data Sheet
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
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
2009–2013 Analog Devices, Inc. All rights reserved.
FEATURES
High performance at low power
High speed
3 dB bandwidth of 750 MHz, G = 1
0.1 dB flatness to 210 MHz, VOUT, dm = 2 V p-p, RL, dm = 200 Ω
Slew rate: 2900 V/s, 25% to 75%
Fast 0.1% settling time of 9 ns
Low power: 9.5 mA per amplifier
Low harmonic distortion
108 dB SFDR @ 10 MHz
98 dB SFDR @ 20 MHz
Low output voltage noise: 9.2 nV/√Hz, G = 1, RTO
±0.2 mV typical input offset voltage
Selectable differential gains of 1, 2, and 3
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Input common-mode range shifted down by 1 VBE
Wide supply range: +3 V to ±5 V
Available in 16-lead and 24-lead LFCSP packages
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The ADA4950-1/ADA4950-2 are gain-selectable versions of the
ADA4932-1/ADA4932-2 with on-chip feedback and gain resistors.
They are ideal choices for driving high performance ADCs as single-
ended-to-differential or differential-to-differential amplifiers. The
output common-mode voltage is user adjustable by means of an
internal common-mode feedback loop, allowing the ADA4950-1/
ADA4950-2 output to match the input of the ADC. The internal
feedback loop also provides exceptional output balance as well
as suppression of even-order harmonic distortion products.
Differential gain configurations of 1, 2, and 3 are easily realized
with internal feedback networks that are connected externally
to set the closed-loop gain of the amplifier.
The ADA4950-1/ADA4950-2 are fabricated using the Analog
Devices, Inc., proprietary silicon-germanium (SiGe) complementary
bipolar process, enabling them to achieve low levels of distortion and
noise at low power consumption. The low offset and excellent
dynamic performance of the ADA4950-x make it well suited for
a wide variety of data acquisition and signal processing applications.
FUNCTIONAL BLOCK DIAGRAMS
1
+INB
2
+INA
3
–INA
4
+INB
11 –OUT
12 PD
10 +OUT
9
VOCM
5
+V
S
6
+V
S
7
+V
S
8
+V
S
15
–V
S
16
–V
S
14
–V
S
13
–V
S
ADA4950-1
07957-
001
Figure 1. ADA4950-1
07957-
002
2
1
3
4
5
6
18
17
16
15
14
13
+INA2
+INB2
+VS1
–INB1
–INA1
–OUT2
PD2
–VS2
VOCM1
+OUT1
8
9
10
11
7
–I
NB2
+V
S2
+V
S2
V
O
CM
2
12
+
OU
T2
–I
NA2
20
19
21
P
D1
–O
UT
1
–V
S1
22
–V
S1
23
+
INB1
24
+
INA1
ADA4950-2
Figure 2. ADA4950-2
–140
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
HARM
O
NI
C
DI
S
T
O
RT
IO
N
(
d
Bc)
FREQUENCY (MHz)
VOUT, dm = 2V p-p
0.1
1
10
100
HD2, ±5V
HD3, ±5V
HD2, ±2.5V
HD3, ±2.5V
07957-
025
Figure 3. Harmonic Distortion vs. Frequency at Various Supplies
The ADA4950-x is available in a Pb-free, 3 mm × 3 mm, 16-lead
LFCSP (ADA4950-1, single) or a Pb-free, 4 mm × 4 mm, 24-lead
LFCSP (ADA4950-2, dual). The pinout has been optimized to
facilitate PCB layout and minimize distortion. The ADA4950-1/
ADA4950-2 are specified to operate over the 40°C to +105°C
temperature range; both operate on supplies from +3 V to ±5 V.
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