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| 型號： | AD604-EVALZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 15/33頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD604 AMP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | X-AMP® |
| 每 IC 通道數(shù)： | 2 - 雙 |
| 放大器類型： | 可變增益 |
| 輸出類型： | 單端 |
| 轉(zhuǎn)換速率： | 170 V/µs |
| -3db帶寬： | 40MHz |
| 電流 - 輸出 / 通道： | 40mA |
| 工作溫度： | -40°C ~ 85°C |
| 電流供應(yīng)（主 IC）： | 32mA |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD604 |
| 相關(guān)產(chǎn)品： | AD604ARZ-RL-ND - IC AMP VGA DUAL ULN 40MA 24SOIC AD604ANZ-ND - IC AMP VGA DUAL ULN 40MA 24DIP AD604ARSZ-R7-ND - IC AMP VGA DUAL ULN 40MA 24SSOP AD604ARSZ-RL-ND - IC AMP VGA DUAL ULN 40MA 24SSOP AD604ARSZ-ND - IC AMP VGA DUAL ULN 40MA 24SSOP AD604ARZ-ND - IC AMP VGA DUAL ULN 40MA 24SOIC AD604AR-REEL-ND - IC AMP VGA DUAL ULN 40MA 24SOIC AD604AR-ND - IC AMP VGA DUAL ULN 40MA 24SOIC |
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AD604
Rev. G | Page 21 of 32
At 1 MHz, the attenuation is about 0.2 dB, increasing to 6 dB
at 10 MHz and 28 dB at 100 MHz. Signals less than approximately
1 MHz are not significantly affected.
Figure 49 shows the control voltage vs. the input power at 1 MHz
to the circuit shown in Figure 48; note that the AGC threshold is at
95 dBm. The output signal level is set to 800 mV p-p by applying
80 mV to the VSET connector.
12
11
10
9
8
1
2
3
4
7
6
5
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15
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17
AD604
FB
–DSX1
+DSX1
PAI1
FBK1
PAO1
COM1
COM2
PAI2
FBK2
PAO2
+DSX2
–DSX2
VGN1
VREF
VPOS
GND1
OUT1
VNEG
VPOS
GND2
OUT2
VOCM
VGN2
FAIR-RITE
#2643000301
C5
0.1F
R2
499
C6
560pF
C3
0.1F
00
54
0-
04
8
Figure 48. Modifications of the AGC Amplifier to Create 96 dB of Gain Range
4.5
4.0
0
3.5
3.0
1.0
2.5
2.0
1.5
CO
NT
R
O
L
V
O
L
T
AG
E
(V
)
1MHz
0.5
PIN (dBm)
–100 –90 –80 –70 –60 –50 –40 –30 –20 –10
0
10
00
54
0-
0
49
Figure 49. Control Voltage vs. Input Power of the Circuit in Figure 48
ULTRALOW NOISE, DIFFERENTIAL INPUT-
DIFFERENTIAL OUTPUT VGA
Figure 50 shows how to use both preamplifiers and DSXs to
create a high impedance, differential input-differential output
VGA. This application takes advantage of the differential inputs
to the DSXs. Note that the input is not truly differential in the
sense that the common-mode voltage needs to be at ground to
achieve maximum input signal swing. This has largely to do
with the limited output swing capability of the output drivers of
the preamplifiers; they clip around ±2.2 V due to having to drive
an effective load of about 30 Ω. If a different input common-mode
voltage needs to be accommodated, ac coupling (as in Figure 48)
is recommended. The differential gain range of this circuit runs
from 6 dB to 54 dB, which is 6 dB higher than each individual
the signal amplitude compared with when they are driven
single-ended.
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AD604
FB
+5V
–5V
ALL SUPPLY PINS ARE DECOUPLED AS SHOWN.
+5V
–5V
+5V
VIN+
VIN–
VG
VREF
VOUT+
VOUT–
–DSX1
+DSX1
PAI1
FBK1
PAO1
COM1
COM2
PAI2
FBK2
PAO2
+DSX2
–DSX2
VGN1
VREF
VPOS
GND1
OUT1
VNEG
VPOS
GND2
OUT2
VOCM
VGN2
C13
0.1F
C12
0.1F
C1
0.1F
C2
0.1F
C4
0.1F
C3
0.1F
C5
0.1F
C7
0.1F
R1
453
R2
453
C6
0.1F
005
40-
05
0
Figure 50. Ultralow Noise, Differential Input-Differential Output VGA
Fig
r
,
ure 51 displays the output signals VOUT+ and VOUT afte
a 20 dB attenuator formed between the 453 Ω resistors shown
in Figure 50 and the 50 Ω loads presented by the oscilloscope
plug-in. R1 and R2 are inserted to ensure a nominal load of 500 Ω
at each output. The differential gain of the circuit is set to 20 dB
by applying a control voltage, VGN, of 1 V; the gain scaling is
20 dB/V for a VREF of 2.500 V; the input frequency is 10 MHz
and the differential input amplitude is 100 mV p-p. The resulting
differential output amplitude is 1 V p-p as can be seen on the
scope photo when reading the vertical scale as 200 mV/div.
10
0%
100
90
20ns
20mV
NOTES
1. THE OUTPUT AFTER 10× ATTENUATER FORMED
BY 453 TOGETHER WITH 50 OF 7A24 PLUG-IN.
–500mV
ACTUAL
VOUT
+500mV
0
05
40-
054
Figure 51. Output of VGA in Figure 50 for VGN = 1 V
channel of the AD604 because the DSX inputs now see twice
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