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參數(shù)資料
| 型號： | AD603ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP VGA 90MHZ LN 50MA 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | X-AMP® |
| 放大器類型： | 可變增益 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 275 V/µs |
| -3db帶寬： | 90MHz |
| 電流 - 輸入偏壓： | 200nA |
| 電流 - 電源： | 12.5mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 9.5 V ~ 12.6 V，±4.75 V ~ 6.3 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： | 管件 |
| 產(chǎn)品目錄頁面： | 774 (CN2011-ZH PDF) |
| 配用： | AD603-EVALZ-ND - BOARD EVALUATION FOR AD603 |
Data Sheet
AD603
Rev. K | Page 19 of 24
During the time VOUT is negative with respect to the base
voltage of Q1, Q1 conducts; when VOUT is positive, it is cut off.
Because the average collector current of Q1 is forced to be
300 A, and the square wave has a duty cycle of 1:1, Q1’s
collector current when conducting must be 600 A. With R8
omitted, the peak amplitude of VOUT is forced to be just the VBE
of Q1 at 600 A, typically about 700 mV, or 2 VBE peak-to-peak.
This voltage, the amplitude at which the output stabilizes, has a
strong negative temperature coefficient (TC), typically 1.7 mV/°C.
Although this may not be troublesome in some applications, the
correct value of R8 renders the output stable with temperature.
To understand this, note that the current in Q2 is made to be
proportional to absolute temperature (PTAT). For the moment,
continue to assume that the signal is a square wave.
When Q1 is conducting, VOUT is now the sum of VBE and a
voltage that is PTAT and that can be chosen to have an equal
but opposite TC to that of the VBE. This is actually nothing more
than an application of the band gap voltage reference principle.
When R8 is chosen such that the sum of the voltage across it
and the VBE of Q1 is close to the band gap voltage of about 1.2 V,
VOUT is stable over a wide range of temperatures, provided, of
course, that Q1 and Q2 share the same thermal environment.
Because the average emitter current is 600 A during each half
cycle of the square wave, a resistor of 833 adds a PTAT
voltage of 500 mV at 300 K, increasing by 1.66 mV/°C. In
practice, the optimum value depends on the type of transistor
used and, to a lesser extent, on the waveform for which the
temperature stability is to be optimized; for the inexpensive
2N3904/2N3906 pair and sine wave signals, the recommended
value is 806 .
This resistor also serves to lower the peak current in Q1 when
more typical signals (usually sinusoidal) are involved, and the
1.8 kHz LP filter it forms with CAV helps to minimize distortion
due to ripple in VAGC. Note that the output amplitude under sine
wave conditions is higher than for a square wave because the
average value of the current for an ideal rectifier is 0.637 times
as large, causing the output amplitude to be 1.88 (= 1.2/0.637) V,
or 1.33 V rms. In practice, the somewhat nonideal rectifier
results in the sine-wave output being regulated to about
1.4 V rms, or 3.6 V p-p.
The bandwidth of the circuit exceeds 40 MHz. At 10.7 MHz, the
AGC threshold is 100 V (67 dBm) and its maximum gain is
83 dB (20 log 1.4 V/100 V). The circuit holds its output at
1.4 V rms for inputs as low as 67 dBm to +15 dBm (82 dB),
where the input signal exceeds the maximum input rating of the
AD603. For a 30 dBm input at 10.7 MHz, the second harmonic
is 34 dB down from the fundamental, and the third harmonic is
35 dB down from the fundamental.
CAUTION
Careful component selection, circuit layout, power supply
decoupling, and shielding are needed to minimize the susceptibility
of the AD603 to interference from signals such as those from
radio and TV stations. In bench evaluation, it is recommended
to place all of the components into a shielded box and use
feedthrough decoupling networks for the supply voltage. Circuit
layout and construction are also critical because stray capacitances
and lead inductances can form resonant circuits and are a
potential source of circuit peaking, oscillation, or both.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD603ARZ | 制造商:Analog Devices 功能描述:Programmable Gain Amplifier IC |
| AD603ARZ-REEL | 功能描述:IC AMP VGA 90MHZ LN 50MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:X-AMP® 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| AD603ARZ-REEL7 | 功能描述:IC AMP VGA 90MHZ LN 50MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:X-AMP® 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| AD603-EB | 制造商:Analog Devices 功能描述:Evaluation Board For Low Noise, 90 MHz Variable Gain Amplifier |
| AD603-EVALZ | 功能描述:BOARD EVALUATION FOR AD603 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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