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| 型号： | AD8432-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD8432 |
| 标准包装： | 1 |
| 每 IC 通道数： | 2 - 双 |
| 放大器类型： | 电压反馈 |
| 输出类型： | 差分 |
| 转换速率： | 295 V/µs |
| -3db带宽： | 200MHz |
| 电流 - 输出 / 通道： | 77mA |
| 工作温度： | -40°C ~ 85°C |
| 电流供应（主 IC）： | 24mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8432 |
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Dual-Channel Ultralow Noise Amplifier with
Selectable Gain and Input Impedance
Data Sheet
Rev. C
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
Fax: 781.461.3113
2009–2012 Analog Devices, Inc. All rights reserved.
FEATURES
Low noise
Input voltage noise: 0.85 nV/√Hz
Current noise: 2.0 pA/√Hz
High speed
200 MHz bandwidth (G = 12.04 dB)
295 V/s slew rate
Selectable gain
G = 12.04 dB (×4)
G = 18.06 dB (×8)
G = 21.58 dB (×12)
G = 24.08 dB (×16)
Active input impedance matching
Integrated input clamp diodes
Single-ended input, differential output
Supply range: 4.5 V to 5.5 V
Low power: 60 mW/channel
APPLICATIONS
CW Doppler ultrasound front ends
Low noise preamplification
Predriver for I/Q demodulators and phase shifters
Wideband analog-to-digital drivers
FUNCTIONAL BLOCK DIAGRAM
BIAS
ENB
COMM
INH1
IND1
INL1
INH2
IND2
INL2
VPS1
VPS2
OPH1
OPL1
GMH1
GOH1
GOL1
GML1
OPH2
OPL2
GMH2
GOH2
GOL2
GML2
LNA1
LNA2
AD8432
08341-
001
Figure 1.
GENERAL DESCRIPTION
The AD8432 is a dual-channel, low power, ultralow noise
amplifier with selectable gain and active impedance matching.
Each channel has a single-ended input, differential output, and
integrated input clamps. By pin strapping the gain setting pins, four
accurate gains of G = 12.04 dB, 18.06 dB, 21.58 dB, and 24.08 dB
(×4, ×8, ×12, and ×16, respectively) are possible. A bandwidth of
200 MHz at G = 12.04 dB makes this amplifier well suited for many
high speed applications.
The exceptional noise performance of the AD8432 is made
possible by the active impedance matching. Using a feedback
network, the input impedance of the amplifiers can be adjusted
to match the signal source impedance without compromising
the noise performance. Impedance matching and low noise in
the AD8432 allow designers to create wider dynamic range
systems that are able to detect even very low level signals.
The AD8432 achieves 0.85 nV/√Hz input-referred voltage noise for
a gain of 12.04 dB. The AD8432’s ultralow noise, low distortion,
gain accuracy, and channel-to-channel matching are ideal for
high performance ultrasound systems and for processing I/Q
demodulator signals.
The AD8432 operates on a single supply of 5 V at 24 mA. It is
available in a 4 mm × 4 mm, 24-lead LFSCP. The LFCSP features
an exposed paddle that provides a low thermal resistance path to
the PCB, which enables more efficient heat transfer and increases
reliability. The operating temperature range is 40°C to +85°C.
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