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| 型號： | AD604ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/33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 13 of 32
THEORY OF OPERATION
The AD604 is a dual-channel VGA with an ultralow noise
preamplifier. Figure 37 shows the simplified block diagram of
one channel. Each identical channel consists of a preamplifier
with gain setting resistors (R5, R6, and R7) and a single-supply
X-AMP (hereafter called DSX, differential single-supply X-AMP)
made up of the following:
A precision passive attenuator (differential ladder).
A gain control block.
A VOCM buffer with supply splitting resistors
(R3 and R4).
An active feedback amplifier (AFA) with gain setting
resistors (R1 and R2). To understand the active-feedback
amplifier topology, refer to the AD830 data sheet. The
AD830 is a practical implementation of the idea.
The preamplifier is powered by a ±5 V supply, while the DSX
uses a single +5 V supply. The linear-in-dB gain response of the
AD604 can generally be described by
G (dB) = Gain Scaling (dB/V) × Gain Control (V) +
(Preamp Gain (dB) 19 dB)
(1)
Each channel provides between 0 dB to 48.4 dB and 6 dB to 54.4
dB of gain, depending on the user-determined preamplifier
gain. The center 40 dB of gain is exactly linear-in-dB while the
gain error increases at the top and bottom of the range. The gain
of the preamplifier is typically either 14 dB or 20 dB but can be
set to intermediate values by a single external resistor (see the
Preamplifier section for details). The gain of the DSX can vary
from 14 dB to +34.4 dB, as determined by the gain control
voltage (VGN). The VREF input establishes the gain scaling;
the useful gain scaling range is between 20 dB/V and 40 dB/V
for a VREF voltage of 2.5 V and 1.25 V, respectively. For
example, if the preamp gain is set to 14 dB and VREF is set to
2.50 V (to establish a gain scaling of 20 dB/V), the gain equation
simplifies to
G (dB) = 20 (dB/V) × VGN (V) – 5 dB
The desired gain can then be achieved by setting the unipolar
gain control (VGN) to a voltage within its nominal operating
range of 0.25 V to 2.65 V (for 20 dB/V gain scaling). The gain is
monotonic for a complete gain control voltage range of 0.1 V to
2.9 V. Maximum gain can be achieved at a VGN of 2.9 V.
The inputs VREF and VOCM are common to both channels.
They are decoupled to ground, minimizing interchannel
crosstalk. For the highest gain scaling accuracy, VREF should
have an external low impedance voltage source. For low accuracy
20 dB/V applications, the VREF input can be decoupled with a
capacitor to ground. In this mode, the gain scaling is determined
by the midpoint between VPOS and GND; therefore, care
should be taken to control the supply voltage to 5 V. The input
resistance looking into the VREF pin is 10 kΩ ± 20%.
The DSX portion of the AD604 is a single-supply circuit, and
the VOCM pin is used to establish the dc level of the midpoint
of this portion of the circuit. The VOCM pin only needs an
external decoupling capacitor to ground to center the midpoint
between the supply voltages (5 V, GND); however, the VOCM
can be adjusted to other voltage levels if the dc common-mode
level of the output is important to the user (for example, see the
section entitled Medical Ultrasound TGC Driving the AD9050,
a 10-Bit, 40 MSPS ADC). The input resistance looking into the
VOCM pin is 45 kΩ ± 20%.
FBKx
C1
VGNx
PAIx
–DSXx
EXT.
COMx
VPOS
VOCM
C3
C2
OUTx
175
G1
Ao
G2
EXT.
175
R4
200k
R3
200k
VREF
DISTRIBUTED GM
GAIN
CONTROL
DIFFERENTIAL
ATTENUATOR
R1
820
R2
20
+DSXx
PAOx
R7
40
R5
32
R6
8
005
40
-03
7
Figure 37. Simplified Block Diagram of a Single Channel of the AD604
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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(yùn)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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