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參數(shù)資料
| 型號： | AD8369ARU-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | 45 dB Digitally Controlled VGA LF to 600 MHz |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | MO-153AB, TSSOP-16 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大小： | 968K |
| 代理商： | AD8369ARU-REEL7 |
REV. 0
–16–
AD8369
For example, suppose the input signal in Figure 4 is a 140 MHz
sinusoid from a ground-referenced 50
W
source. The 0.1
m
F
coupling capacitors present a very low reactance at this frequency
(11 m
W
) so that essentially all of the ac voltage is delivered to the
differential inputs of the AD8369. It will be apparent that, in
addition to the use of adequate coupling capacitance, the external
capacitor used to extend the low frequency range of the offset
control loop, C
FILT
, must also be large enough to prevent the
offset control loop from attempting to track the ac signal fluctuations.
Interfacing to an ADC
The AD8369 can be used to effectively increase the dynamic
range of an ADC in a direct IF sampling receiver application.
Figure 5 provides an example of an interface to an ADC designed
for an IF of 70 MHz. It comprises a low-pass filter that attenuates
harmonics while providing an impedance transformation from
200
W
to 1 k
W
. This impedance transformation allows the AD8369
to operate much below its peak output swing in the pass band,
which significantly reduces distortion.
0.1 F
CONTROL INTERFACE
9
10
11
FILT
12
13
14
15
16
INHI COMM
PWUP VPOS SENB
CMDC OPHI
INLO
1
DENB
7
COMM BIT0
2
BIT1
4
BIT2
5
BIT3
6
AD8369
OPLO
0.1 F
V
S
8
3
0.1 F
0.1 F
0.1 F
6.8pF
15pF
1k
270nH
270nH
ADC
Figure 5. AD8369 to ADC Interface
ADC OUTPUT FREQUENCY – MHz
0
–10
0
P
O
–20
–30
–40
–50
–60
–70
–80
–90
–100
5
10
15
20
25
30
70MHz – 1dBFS
HD2 = –83dBc
HD3 = –80dBc
SNR = 51dB
Figure 6. Single-Tone 70 MHz, –1 dBFS
ADC OUTPUT FREQUENCY – MHz
0
–10
0
P
O
–20
–30
–40
–50
–60
–70
–80
–90
–100
5
10
15
20
25
30
–72.5dBFS
–7dBFS
Figure 7. Two-Tone, 70 MHz, 70.3 MHz, –7 dBFS
A high performance 14-bit ADC, the AD6645, is used for illus-
trative purposes and is sampling at 64 MSPs with a full-scale
input of 2.2 V p-p. Typically, an SNR of 51 dB and an SFDR of
almost –90 dBFS are realized by this configuration. Figure 6 shows
an FFT of the AD8369 delivering a single tone at –1 dBFS (that
is, 2 V p-p) at the input of the ADC with an HD2 of –83 dBc and
HD3 of –80 dBc. Figure 7 shows that the two-tone, third-order
intermodulation distortion level is –65.5 dBc.
PCB Layout Considerations
Each input and output pin of the AD8369 presents 100
W
rela
tive to their respective ac grounds. To ensure that signal
integrity is not seriously impaired by the printed circuit board, the
relevant connection traces should provide a characteristic
impedance of 100
W
to the ground plane. This can be achieved
through proper layout. Figure 8 shows the cross section of a PC
board and Table II shows the dimensions that will provide a
100
W
line impedance.
Table II. Dimensions Required for 100
W
Characteristic
Impedance Microstrip Line in FR-4
r
(FR-4)
W
H
T
4.6
22 mils
53 mils
2.1 mils
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| AD8369ARUZ | 功能描述:IC AMP VGA 16TSSOP 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):4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8369ARUZ-REEL7 | 功能描述:IC AMP VGA 16TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:X-AMP® 標準包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉換速率: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） 供應商設備封裝:8-TSSOP 包裝:管件 |
| AD8369EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:45 dB Digitally Controlled VGA LF to 600 MHz |
| AD8369-EVAL | 制造商:Analog Devices 功能描述:AD8369 EVALUATION BOARD - Bulk |
| AD8369-EVALZ | 制造商:Analog Devices 功能描述:EVALUATION BOARD - Boxed Product (Development Kits) |
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