參數(shù)資料
型號(hào)： AD797ARZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP GP 110MHZ ULDIST 8SOIC
標(biāo)準(zhǔn)包裝： 2,500
放大器類型： 通用
電路數(shù)： 1
轉(zhuǎn)換速率： 20 V/µs
增益帶寬積： 110MHz
-3db帶寬： 8MHz
電流 - 輸入偏壓： 250nA
電壓 - 輸入偏移： 25µV
電流 - 電源： 8.2mA
電流 - 輸出 / 通道： 50mA
電壓 - 電源，單路/雙路(±)： ±5 V ~ 15 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 帶卷 (TR)
Data Sheet
AD797
Rev. J | Page 17 of 20
Ultrasound/Sonar Imaging Preamp
The AD600 variable gain amplifier provides the time-controlled
gain (TCG) function necessary for very wide dynamic range
sonar and low frequency ultrasound applications. Under some
circumstances, it is necessary to buffer the input of the AD600
to preserve its low noise performance. To optimize dynamic
range, this buffer should have a maximum of 6 dB of gain. The
combination of low noise and low gain is difficult to achieve.
The input buffer circuit shown in Figure 51 provides 1 nV/√Hz
noise performance at a gain of 2 (dc to 1 MHz) by using 26.1 Ω
resistors in its feedback path. Distortion is only 50 dBc at
1 MHz for a 2 V p-p output level and drops rapidly to better
than 70 dBc at an output level of 200 mV p-p.
*
7
*
+VS
VS = ±6Vdc
VOUT
AD797
00846-
050
26.1
6
3
4
2
–VS
AD600
VIN
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 51. An Ultrasound Preamplifier Circuit
Amorphous (Photodiode) Detector
Large area photodiodes (CS ≥ 500 pF) and certain image
detectors (amorphous Si) have optimum performance when used
in conjunction with amplifiers with very low voltage (rather than
very low current noise). Figure 52 shows the AD797 used with
an amorphous Si (CS = 1000 pF) detector. The response is adjusted
for flatness using capacitor CL, and the noise is dominated by
voltage noise amplified by the ac noise gain. The AD797’s excellent
input noise performance gives 27 μV rms total noise in a 1 MHz
bandwidth, as shown by Figure 53.
*
7
*
+VS
IS
AD797
00846-
051
10k
100
CL
50pF
CS
1000pF
6
3
4
2
–VS
VOUT
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 52. Amorphous Detector Preamp
00846-
052
100M
1k
100
0
60
20
40
80
10M
1M
100k
10k
FREQUENCY (Hz)
VO
LT
AG
E
N
OIS
E
(mV
rms
(0.
1Hz
F
RE
Q
UE
NCY
))
V
O
UT
(d
B
Re
1V
/
A)
–80
–30
–50
–70
–60
–40
NOISE
VOUT
Figure 53. Total Integrated Voltage Noise and VOUT
of Amorphous Detector Preamp
Professional Audio Signal Processing—DAC Buffers
The low noise and low distortion of the AD797 make it an ideal
choice for professional audio signal processing. An ideal I-to-V
converter for a current output DAC would simply be a resistor
to ground, were it not for the fact that most DACs do not operate
linearly with voltage on their output. Standard practice is to
operate an op amp as an I-to-V converter, creating a virtual
ground at its inverting input. Normally, clock energy and current
steps must be absorbed by the op amp output stage. However, in
the configuration shown in Figure 54, Capacitor CF shunts high
frequency energy to ground while correctly reproducing the
desired output with extremely low THD and IMD.
7
*
+VS
–VS
AD797
00846-
053
CF
82pF
6
2
C1
2000pF
4
100
3k
AD1862
DAC
3
VOUT
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 54. A Professional Audio DAC Buffer
VOUT
7
+VS
–VS
AD797
6
2
4
3
1
5
VOS ADJUST
00846-
054
–IN
+IN
20k
Figure 55. Offset Null Configuration
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