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參數(shù)資料
| 型號(hào)： | RF2670 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | 8MHZ DUAL BASEBAND AGC WITH PROGRAMMABLE LOW PASS FILTERING |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | RF2670 |
10-52
RF2670
Rev A4 010820
10
I
Evaluation Board S chematic
(Download Bill of Materials from www.rfmd.com.)
C26
10 nF
C25
100 pF
C24
10 nF
C23
100 pF
C22
10 nF
C21
100 pF
P3-1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
IN I-
IN I+
GND2
DCFB I
VCC2
GND3
IF OUT I
VCC3
I DATA
RSSI I
V IF EN
GND1
IN Q-
IN Q+
GND1
DCFB Q
VCC1
VGC
IF OUT Q
VREF
RSSI Q
Q DATA
BW SEL2
BW SEL1
C6
100 nF
C5
100 nF
C2
1 nF
L1
10
μ
H
C1
220 pF
T1
50
μ
strip
J1
I IN
L2
10
μ
H
DCFB I
C9
220 nF
VCC
50
μ
strip
J2
IF OUT I
50
μ
strip
J3
I DATA
RSSI I
C13
68 pF
V IF EN
C8
100 nF
C7
100 nF
C3
1 nF
L3
10
μ
H
C4
220 pF
T2
50
μ
strip
J4
Q IN
L4
10
μ
H
DCFB Q
C10
220 nF
VCC
VGC
50
μ
strip
J5
IF OUT Q
VREF
C11
47 nF
RSSI Q
J6
Q DATA
C12
68 pF
50
μ
strip
BW SEL2
BW SEL1
C27
10
μ
F
2670400-
P5
1
2
3
P5-1
BW SEL2
GND
P5-3
BW SEL1
P4
1
2
3
P4-1
DCFB Q
GND
P4-3
VREF
P3
1
2
3
VCC
GND
P3-3
VGC
P2
1
2
3
P2-1
RSSI Q
GND
P2-3
RSSI I
P1
1
2
3
P1-1
V IF EN
GND
P1-3
DCFB I
L1-L4 and C1-C4 make two LPFs. The fc of the RF2670 is variable;
therefore the L and C components must be variable. The following
table gives recommended component values ("std" indicates standard
eval board value).
Desired BW
BW1, BW2
C1, C4 (pF) C2, C3 (pF)
L1-L4 (
μ
H)
22
700 kHz
1.4 MHz
2.8 MHz
7.0 MHz
0 0
0 1
1 0
1 1
330
220 (std)
100
33
1800
1000 (std)
470
180
10
4.7
2.2
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