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| 型號： | AD600ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/33頁 |
| 文件大小： | 0K |
| 描述： | IC AMP VGA DUAL LN 50MA 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | X-AMP® |
| 放大器類型： | 可變增益 |
| 電路數(shù)： | 2 |
| 轉(zhuǎn)換速率： | 275 V/µs |
| -3db帶寬： | 35MHz |
| 電流 - 輸入偏壓： | 350nA |
| 電流 - 電源： | 11mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.75 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 774 (CN2011-ZH PDF) |
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AD600/AD602
Rev. F | Page 15 of 32
APPLICATIONS INFORMATION
The full potential of any high performance amplifier can be
realized only by careful attention to details in its applications.
The following pages describe fully tested circuits in which many
such details have already been considered. However, as is always
true of high accuracy, high speed analog circuits, the schematic
is only part of the story; this is no less true for the AD600/
AD602. Appropriate choices in the overall board layout and the
type and placement of power supply decoupling components
are very important. As explained previously, the input grounds
A1LO and A2LO must use the shortest possible connections.
CONTROL VOLTAGE,
+625mV
–625mV
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
The following circuits show examples of time-gain control for
ultrasound and sonar, methods for increasing the output drive,
and AGC amplifiers for audio and RF/IF signal processing
using both peak and rms detectors. These circuits also illustrate
methods of cascading X-AMPs for either maintaining the
optimal SNR or maximizing the accuracy of the gain-control
voltage for use in signal measurement. These AGC circuits can
be modified for use as voltage-controlled amplifiers in sonar
and ultrasound applications by removing the detector and
substituting a DAC or other voltage source for supplying the
control voltage.
TIME-GAIN CONTROL (TGC) AND TIME-VARIABLE
GAIN (TVG)
Ultrasound and sonar systems share a similar requirement: both
need to provide an exponential increase in gain in response to a
linear control voltage, that is, a gain control that is linear in dB.
Figure 33 shows the AD600/AD602 configured for a control
voltage ramp starting at 625 mV and ending at +625 mV for a
gain-control range of 40 dB. The polarity of the gain-control
voltage can be reversed, and the control voltage inputs, C1HI
and C1LO, can be reversed to achieve the same effect. The gain-
control voltage can be supplied by a voltage output DAC, such
as the AD7244, which contains two complete DACs, operates
from ±5 V supplies, has an internal reference of +3 V, and
provides ±3 V of output swing. As such, it is well suited for use
with the AD600/AD602, needing only a few resistors to scale
the output voltage of the DACs to the levels needed by the
AD600/AD602.
REF
A1
A2
C1HI
A1CM
A1OP
VNEG
A2OP
A2CM
C2HI
C1LO
A1HI
A1LO
GAT1
A2LO
A2HI
C2LO
VG
AD600 OR
AD602
GAT2
+5V
–5V
+
–
+
–
VPOS
VOLTAGE-OUTPUT
DAC
A1
GAIN
0dB
40dB
00
538
-03
1
VG
VPOS
VNEG
VIN
Figure 33. The Simplest Application of the X-AMP Is as a TGC or TVG Amplifier
in Ultrasound or Sonar (Only A1 Connections Shown for Simplicity)
INCREASING OUTPUT DRIVE
The AD600/AD602 output stage has limited capability for
negative-load driving capability. For driving loads less than
500 Ω, the load drive can be increased by approximately 5 mA
by connecting a 1 kΩ pull-down resistor from the output to the
negative supply (see Figure 34).
DRIVING CAPACITIVE LOADS
For driving capacitive loads of greater than 5 pF, insert a 10 Ω
resistor between the output and the load. This lowers the
possibility of oscillation.
1k
1
2
3
4
5
16
15
14
13
12
6
7
8
11
10
9
REF
A1
C1HI
A1CM
A1OP
C1LO
A1HI
A1LO
GAT1
GAIN-CONTROL
VOLTAGE
A2
A2OP
A2CM
C2HI
A2LO
A2HI
C2LO
GAT2
+5V
–5V
+
–
+
–
AD600/
AD602
PULL-DOW
RESISTOR
ADDED
N
00
538
-032
Figure 34. Adding a 1 kΩ Pull-Down Resistor Increases the X-AMP Output
Drive by About 5 mA (Only A1 Connections Shown for Simplicity)
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| AD600ARZ-R7 | 功能描述:IC AMP VGA DUAL LN 50MA 16SOIC 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) |
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