RFDA0066 Datasheet, PDF (12/18 Pages) RF Micro Devices – DIGITAL CONTROLLED VARIABLE GAIN AMPLIFIER 5MHz TO 1GHz, 12-BIT 0.5dB LSB CONTROL

RFDA0066
Evaluation Board Schematic
5MHz to 250MHz Application Circuit
VDD
CLK
LE
DATA
PUP
VCC
R1
L1
P1
1
2
3
4
5
6
HDR_1X6
23.7
+
4700nH
C1 0
C9
10uF
1uF
C8
1000pF
C7
1uF
P2
VCC
1
2
HDR_1X2
C6
C5
1uF
C4
10000pF
C3
10000pF
C2
10000pF
J1
RFIN
1
C1
2.2uF
10000pF
1 _{AMP1 _IN}
2 _{DSA1 _OUT}
3 _ACG1
4 _ACG2
5 _ACG3
6 _ACG4
7 _{DSA1 _IN}
U1
RFDA0066
R5
R4
VDD
1K
DNP
PUP
C12
C13
C14
10000pF 10000pF 10000pF
ACG5 ²¹
GND ²⁰
DSA2 _OUT ¹⁹
AMP2 _IN ¹⁸
GND ¹⁷
GND ¹⁶
AMP2 _OUT ¹⁵
C15
10000pF
C16
1uF
R6
P3
1 _TXD
GND ²⁴
DNPCLK
2 _DTR#
CB0 ²³
DATA
3 _RTS#
CB1 ²²
4 _VIO
VCC ²¹
LE
5 _RXD
RST ²⁰
6 _RI#
3V3 ¹⁹
7 _GND
CB3 ¹⁸
8 _DSR#
PU1 ¹⁷
9 _{DCD# PU2} 16
10 _{CTS# VCC} 15
11 _CB4
USB ¹⁴
12 _CB2
SLD ¹³
UM2 32R
C17
2.2uF
J2
1
RFOUT
L2
4700nH
R3
VCC
C18
1000pF
+
C19
1uF
23.7
C2 0
10uF
PUP
DATA
LE
RN1
1
2
3
4
CLK
5
6
7
8
C2 1
DNP
1K
VDD
C22
C23
10000pF 1uF
*Required Bias Resistance for I_CC =115mA (one Amplifier)
Bias Resistance = R_BIAS + R_CHOKE = ( V_CC -V_D ) / I_CC
( V_CC: Supply Voltage; V_D: Voltage on the device, ~4.9-5.0V; R_BIAS: Bias Resistor;
R_CHOKE: DCR of choke)
Supply Voltage
Bias Resistance
Bias Resistance
7V
8V
9V
12V
19
27.5
36
63
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DS141218