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参数资料
| 型号： | AA110-85 |
| 元件分类： | 衰减器 |
| 英文描述： | 0 MHz - 2000 MHz RF/MICROWAVE VARIABLE ATTENUATOR, 2.6 dB INSERTION LOSS-MAX |
| 封装： | SSOP-20 |
| 文件页数： | 5/5页 |
| 文件大小： | 566K |
| 代理商： | AA110-85 |
Alpha Industries, Inc. [978] 241-7000
Fax [978] 241-7906 Email sales@alphaind.com www.alphaind.com
5
Specifications subject to change without notice. 2/02A
GaAs IC 5 Bit Digital Attenuator with Driver 1 dB LSB Positive Control DC–2 GHz
AA110-85
J1
GND
J2
N/C
VCC
VSS
CTL1
CTL2
CTL4
CTL8
CTL16
0.01
F
(Negative Voltage
Holding Capacitor)
(Power Supply
Bypass Capacitor)
(Charge Pump Capacitor)
0.01
F
0.025
F
C2
C1
12
3
4
5
6
7
8
20
19
18
17
16
15
14
13
91
0
12
11
1 dB
Dr
iv
er
2 dB
4 dB
8 dB
16 dB
Pin Out
“0” = 0 to 0.8 V (VCC = 5 V).
“1” = 3 to 5 V (VCC = 5 V).
Attenuation
CTL1
CTL2
CTL4
CTL8
CTL16
J1–J2
0
Ins. Loss
10
0
1 dB
01
0
2 dB
00
1
0
4 dB
00
0
1
0
8 dB
0
1
16 dB
1
31 dB
Truth Table
Characteristic
Value
RF Input Power
2 W > 500 MHz, 0/6 V
0.5 W > 50 MHz, 0/6 V
Supply Voltage
6 V
Control Voltage1
-0.2 V, +6 V
Operating Temperature
-40°C to +85°C
Storage Temperature
-65°C to +150°C
ΘJC
85°C/W
Absolute Maximum Ratings
Note: Exceeding these ratings may cause irreversible damage.
1. Control voltage must not exceed supply voltage.
Compression Point vs. Attenuation,
Voltage, and Temperature
Attenuation
Control
Input Power @ 1 dB Compression
State
Voltage (V) +25°C (dBm) +85°C (dBm) -40°C (dBm)
Ins. Loss
3
16.6
16.5
1 dB
3
17.5
2 dB
3
18.9
19
18.8
4 dB
3
16.3
16.6
16.3
8 dB
3
20.6
21.1
21.8
16 dB
3
15.5
15.1
16.2
31 dB
3
20.2
19.9
20.1
Frequency = 50 MHz.
Application Information
The on chip charge pump oscillates at approximately
600 KHz, which may create noise in the user’s circuit.
When the input level to the attenuator is low, < -10 dBm,
the signal to noise ratio starts to degrade. For many
applications input power levels are typically in the -20 dBm
to -30 dBm range. At these input levels there is
insufficient signal to noise. Alpha has developed a solution
to this problem. Part number AA117-85 has the same
attenuation range as the AA110-85, but the charge pump
oscillator has been turned off. The user can still control the
part with 0/+V, however, a negative VSS voltage is required.
See AA117-85 data sheet for further information.
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