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| 型號： | AD604ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/33頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP VGA DUAL ULN 40MA 24SOIC |
| 標(biāo)準(zhǔn)包裝： | 31 |
| 系列： | X-AMP® |
| 放大器類型： | 可變增益 |
| 電路數(shù)： | 2 |
| 轉(zhuǎn)換速率： | 170 V/µs |
| -3db帶寬： | 40MHz |
| 電流 - 輸入偏壓： | 400nA |
| 電流 - 電源： | 32mA |
| 電流 - 輸出 / 通道： | 40mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC W |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 774 (CN2011-ZH PDF) |
| 配用： | AD604-EVALZ-ND - BOARD EVAL FOR AD604 AMP |
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AD604
Rev. G | Page 19 of 32
VG
13
16
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14
19
18
17
24
23
22
21
20
12
11
10
9
8
1
2
3
4
7
6
5
AD604
–5V
+5V
VREF
RF OUT
–5V
+5V
8
7
6
5
1
2
3
4
AD711
NC
OUT
AD835
+5V
–5V
+5V
2
VSET (<0V)
–DSX1
+DSX1
PAI1
FBK1
PAO1
COM1
COM2
PAI2
FBK2
PAO2
+DSX2
–DSX2
VGN1
VREF
VPOS
GND1
OUT1
VNEG
VPOS
GND2
OUT2
VOCM
VGN2
FB
+5V
–5V
ALL SUPPLY PINS ARE DECOUPLED AS SHOWN.
1V
OFFS
NULL
C1
0.1F
C2
0.1F
VIN
(MAX
800mV p-p)
R1
49.9
C3
0.1F
C4
0.1F
C12
0.1F
C13
0.1F
C7
0.1F
C6
0.56F
R2
453
R3
1k
C7
0.33F
V1 = VIN ×G
R4
2k
C8
0.33F
87
6
5
1
234
C9
0.33F
R5
2k
R6
2k
–(A)2
IF V1 = A × cos (wt)
Y1
Y2
VN
Z
X1
X2
VP
W
–(V1)2
LOW-
PASS
FILTER
R7
1k
C10
1F
C11
1F
R8
2k
+VS
–VS
OFFS
NULL
00
54
0-
0
44
Figure 44. AGC Amplifier with 82 dB of Gain Range
ULTRALOW NOISE AGC AMPLIFIER WITH 82 dB TO
96 dB GAIN RANGE
Figure 44 shows an implementation of an AGC amplifier with
82 dB of gain range using a single AD604. The signal is applied
to connector VIN and, because the signal source is 50 Ω, a
terminating resistor (R1) of 49.9 Ω is added. The signal is then
amplified by 14 dB (Pin FBK1 shorted to PAO1) through the
Channel 1 preamplifier and is further processed by the Channel 1
DSX. Next, the signal is applied directly to the Channel 2 DSX. The
second preamplifier is powered down by connecting its COM2 pin
to the positive supply as explained in the Preamplifier section.
C1 and C2 level shift the signal from the preamplifier into the
first DSX and, at the same time, eliminate any offset contribution
of the preamplifier. C3 and C4 have the same offset cancellation
purpose for the second DSX. Each set of capacitors, combined
with the 175 Ω input resistance of the corresponding DSX,
provides a high-pass filter with a 3 dB corner frequency of
about 9.1 kHz. VOCM is decoupled to ground by a 0.1 μF
capacitor, while VREF can be externally provided; in this
application, the gain scale is set to 20 dB/V by applying 2.500 V.
Because each DSX amplifier operates from a single 5 V supply,
the output is ac-coupled via C6 and C7. The output signal can
be monitored at the connector labeled RF OUT.
the AD604 connected as shown in Figure 44. The gain range is
14 dB to +82 dB; the useful range is 0 dB to +82 dB if the RF
output amplitude is controlled to ±400 mV (+2 dBm). The main
limitation on the lower end of the signal range is the input
capability of
the preamplifier. This limitation can be overcome by adding an
attenuator in front of the preamplifier, but that would defeat the
advantage of the ultralow noise preamplifier. It should be noted
that the second preamplifier is not used because its ultralow
noise and the associated high-power consumption are overkill
after the first DSX stage. It is disabled in this application by
connecting the COM2 pin to the positive supply. Nevertheless,
the second preamplifier can be used, if so desired, and the
useful gain range increases by 14 dB to encompass 0 dB to
96 dB of gain. For the same +2 dBm output, this allows signals
as small as 94 dBm to be measured.
To achieve the highest gains, the input signal must be band-
limited to reduce the noise; this is especially true if the second
preamplifier is used. If the maximum signal at OUT2 of the AD604
is limited to ±400 mV (+2 dBm), the input signal level at the
AGC threshold is +25 μV rms (79 dBm). The circuit as shown in
Figure 44 has about 40 MHz of noise bandwidth; the 0.8 nV/√Hz
of input referred voltage noise spectral density of the AD604
results in an rms noise of 5.05 μV in the 40 MHz bandwidth.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD604ARZ | 制造商:Analog Devices 功能描述:IC AMP VARIABLE GAIN |
| AD604ARZ-RL | 功能描述:IC AMP VGA DUAL ULN 40MA 24SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:X-AMP® 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
| AD604-EB | 制造商:Analog Devices 功能描述: |
| AD604-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual, Ultralow Noise Variable Gain Amplifier |
| AD604-EVALZ | 功能描述:BOARD EVAL FOR AD604 AMP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 系列:X-AMP® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
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