参数资料
型号: AD8332ARUZ-RL
厂商: Analog Devices Inc
文件页数: 17/56页
文件大小: 0K
描述: IC AMP VAR GAIN 2CHAN 28TSSOP
标准包装: 2,500
系列: X-AMP®
类型: 可变增益放大器
应用: 信号处理
安装类型: 表面贴装
封装/外壳: 28-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 28-TSSOP
包装: 带卷 (TR)
配用: AD8332-EVALZ-ND - BOARD EVAL FOR AD8332
AD8331/AD8332/AD8334
Rev. G | Page 24 of 56
THEORY OF OPERATION
0
3199-
071
CLAMP
LNA 2
LNA 1
INH1
LON1 LOP1 VIP1 VIN1 EN12
INH2
LON2
LOP2
VIP2
PA2
– ATTENUATOR
–48dB
+
VGA BIAS AND
INTERPOLATOR
+ ATTENUATOR
–48dB
GAIN UP/
DOWN
VMID1
CLAMP
GAIN
INT
VOH1
CLMP12
VOL1
VOL2
GAIN12
HILO
VOH2
VIN2
MODE
VCM1
VMID2
VMID3
VCM2
VCM3
VMID4
LNA 4
LNA 3
INH3
LON3
LOP3
LMD3
LMD4
INH4
VCM
BIAS
VCM
BIAS
PA3
PA4
– ATTENUATOR
–48dB
+
VGA BIAS AND
INTERPOLATOR
+ ATTENUATOR
–48dB
GAIN
INT
VOH3
VOL3
VOL4
GAIN34
VOH4
CLMP34
21dB
VIP3
VIN3
VCM4
EN34
VIN4
VIP4
LON4
LOP4
AD8334
LMD1
LMD2
PA1
OVERVIEW
The AD8331/AD8332/AD8334 operate in the same way.
Figure 69, Figure 70, and Figure 71 are functional block
diagrams of the three devices
0319
9-
06
9
VOL
VOH
LNA
ATTENUATOR
–48dB
+
INH
VIN
VIP
LOP
LON
ENBV
GAIN
AD8331
+
MODE
HILO
3.5dB/
15.5dB
RCLMP
VMID
VCM
VGA BIAS AND
INTERPOLATOR
ENBL
GAIN INT
VCM
BIAS
PA
21dB
CLAMP
LMD
Figure 69. AD8331 Functional Block Diagram
0
3199
-070
LNA 2
LNA 1
+19dB
INH1
LON1 LOP1
LON2 LOP2
VIP1
VIP2
VIN1
VIN2
LMD1
LMD2
INH2
LNA VMID
PA1
PA2
– ATTENUATOR
–48dB
+
VGA BIAS AND
INTERPOLATOR
+ ATTENUATOR
–48dB
3.5dB/
15.5dB
ENB
GAIN
INT
VOH1
VOL1
VOH2
VOL2
GAIN
RCLMP
HILO
AD8332
VMID
VCM1
VMID
VCM2
CLAMP
21dB
Figure 71. AD8334 Functional Block Diagram
Each channel contains an LNA that provides user-adjustable input
impedance termination, a differential X-AMP VGA, and a pro-
grammable gain postamp with adjustable output voltage limiting.
Figure 72 shows a simplified block diagram with external
components.
Figure 70. AD8332 Functional Block Diagram
0
3199-
072
LNA
VOL
VOH
HILO
INH
LMD
LOP
LON
PREAMPLIFIER
19dB
POSTAMP
3.5dB/15.5dB
SIGNAL PATH
BIAS AND
INTERPOLATOR
VIN
VIP
RCLMP
21dB
VCM
VMID
CLAMP
48dB
ATTENUATOR
GAIN
INTERFACE
GAIN
VCM
BIAS
Figure 72. Simplified Block Diagram
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