- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄6046 > AD8368ACPZ-REEL7 (Analog Devices Inc)IC AMP VGA 24LFCSP PDF資料下載
參數(shù)資料
| 型號： | AD8368ACPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP VGA 24LFCSP |
| 設計資源： | Extending the Dynamic Range of ADL5513 Logarithmic Detector Using AD8368 (CN0072) |
| 標準包裝： | 1 |
| 系列： | X-AMP® |
| 放大器類型： | 可變增益 |
| 電路數(shù)： | 1 |
| -3db帶寬： | 800MHz |
| 電流 - 電源： | 60mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 24-LFCSP-VQ（4x4） |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 775 (CN2011-ZH PDF) |
| 其它名稱： | AD8368ACPZ-REEL7DKR |
AD8368
Rev. B | Page 14 of 20
APPLICATIONS INFORMATION
VGA OPERATION
The AD8368 is a general-purpose VGA suitable for use in a wide
variety of applications where accurate, continuous, linear-in-dB
gain control over a broad range of frequencies is important. Its
stability over temperature and supply in comparison to other
variable gain techniques can be traced back to the X-AMP
architecture. While having an 800 MHz bandwidth, its low
frequency operation can be extended by properly selecting
CHPFL and CDECL.
The typical connections for using the AD8368 in VGA mode are
illustrated in Figure 33. The input (INPT) and output (OUTP) of
the AD8368 should be externally ac-coupled to prevent disrupting
the dc levels on the chip. Therefore, a sufficiently large coupling
capacitor should be used such that the series impedance of the
capacitor is negligible at the frequencies of interest.
05
90
7-
03
6
ICOM
GAIN
EN
B
L
VPS
I
VPS
I
MO
D
E
IC
OM
IN
P
T
OC
OM
OU
TP
V
PSO
V
PSO
V
PSI
V
PSI
ICOM
DETO
ICOM
HPFL
DECL
DETI
VPSI
OCOM
AD8368
VGAIN
0V TO 1V
VPOS
VIN
REF
X2
–
+
VPOS
VOUT
Figure 33. Typical Connections for VGA Mode for
Increasing Gain with Increasing VGAIN (MODE High)
The gain control voltage ranging from 0 V to 1 V is applied to
the GAIN pin. The MODE pin controls whether the gain of the
part is an increasing or decreasing function of the gain voltage.
When the MODE pin is pulled high, the gain increases with
increasing gain voltages. When the MODE pin is pulled low, the
gain decreases with increasing gain voltages. The ENBL pin is
used to enable or disable the part. ENBL is active high; when
ENBL is pulled low, the part is disabled and draws a fraction of
the normal supply current.
The DECL pin provides the internal midsupply dc reference
for the AD8368. It should be well decoupled to ground using a
large capacitor with low ESR. The capacitors connected to the
HPFL pin and DECL pin are used to control the low-pass
corner frequency of the output offset correction loop. The
resulting high-pass corner frequency is inversely proportional
to their values.
AGC OPERATION
The AD8368 can be configured as a standalone AGC amplifier
by using the on-board rms detector, as shown in Figure 34. The
detector output, DETO, is an error current representing the
difference of squares between the root-mean-square (rms) of
the sensed signal and an internal reference of 63 mV rms. This
error current is integrated on CDETO and connected to the GAIN
pin to form the AGC loop.
The 63 mV rms reference corresponds to 178 mV p-p for a sine
wave but the detector accuracy is maintained for more complex
signals, such as Gaussian noise, complex envelopes, and multi-
carrier signals with high peak-to-average ratios.
05
90
7-
03
7
ICOM
GAIN
E
NBL
VP
SI
VP
SI
MO
D
E
IC
OM
IN
P
T
OC
OM
OU
T
P
VPS
O
VPS
O
VPS
I
VPS
I
ICOM
DETO
ICOM
HPFL
DECL
DETI
VPSI
OCOM
AD8368
RSSI
CDETO
VPOS
VIN
REF
X2
–
+
VPOS
VOUT
R2
R1
Figure 34. AGC Mode of Operation
The AGC mode of operation requires a specific gain direction.
The gain must fall as VDETO increases to restore the needed
balance against the setpoint. Therefore, the MODE pin must be
pulled low. By connecting the signal at OUTP directly to the
detector input (DETI), the output level is driven to the 63 mV
rms reference setpoint.
相關PDF資料 |
PDF描述 |
|---|---|
| PBC14SACN | CONN HEADER .100 SINGL STR 14POS |
| PBC14SABN | CONN HEADER .100 SINGL STR 14POS |
| PEC15SFBN | CONN HEADER .100 SINGL STR 15POS |
| PEC12SAEN | CONN HEADER .100 SINGL STR 12POS |
| PEC19SABN | CONN HEADER .100 SINGL STR 19POS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD8368ACPZ-WP | 功能描述:IC AMP VGA 24LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:X-AMP® 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 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） 供應商設備封裝:8-SO 包裝:帶卷 (TR) |
| AD8368-EVALZ | 制造商:Analog Devices 功能描述:EVAL BD 800 MHZ, LINEAR-IN-DB VGA W/ AGC DETECTOR - Bulk 制造商:Analog Devices 功能描述:EVALUATION BOARD KIT |
| AD8369 | 制造商:AD 制造商全稱:Analog Devices 功能描述:45 dB Digitally Controlled VGA LF to 600 MHz |
| AD8369ARM | 制造商:Analog Devices 功能描述:500 MHZ DIGITAL VGA - Bulk |
| AD8369ARU | 制造商:Analog Devices 功能描述:SP Amp Variable Gain Amp Single 5.5V 16-Pin TSSOP Tube 制造商:Rochester Electronics LLC 功能描述:TSSOP IF DIGITAL CONTROL VGA - Bulk 制造商:Analog Devices 功能描述:IC SEMICONDUCTOR ((NS)) |
發(fā)布緊急采購，3分鐘左右您將得到回復。