5-30
Schematic Diagrams, Overlays, and Parts Lists
Steering Line
2 to 11 VDC
Freq Range
819.35 to 837.35 MHz
Freq Range
746 to 794 MHz
1.9 V when selected
1.9 V when selected
Switched supplies for VCOs
on this page
3 dBm typical
to PA
5 mA current draw
Allows 3V logic from frac-N to control 5V logic of VCO
0V for RX
5V for TX
VCO Select Line
5V when selected
TX VCO
RX VCO
LEVEL SHIFT FOR VCO SELECT
L609
R5
TX BUFFER
Supply from U201
4.6 V Super Filter
L610
8.2nH
47
47nH
R607
R608
15K
R609
100
18nH
15K
L607
NU
R611
R610
33
C624
100nH
1
3
2
L608
45J93
FL601
BFQ67W
Q600
C601
51pF
68pF
C653
C663
68pF
0.1uF
C620
33K
R662
C627
7.5pF
C671
51pF
0.1uF
C614
C615
68pF
0.1uF
C616
C669
R606
10
47pF
33
R657
120
33
R612
R652
R602
.033uF
C652
33
47nH
L654
L655
100pF
C661
27nH
68pF
C665
33
R660
10
R659
0.1uF
C651
47pF
C667
C666
3.3pF
C604
NU
C603
NU
L656
4.7nH
51pF
C625
C626
51pF
51pF
C628
R661
100
47K
R658
Q601
BFQ67W
1
3
2
C664
100nH
68pF
.033uF
L600
0.1uF
C600
C670
68pF
C650
C623
51pF
L652
100nH
100nH
L603
2
1
L650
100nH
2pF
C656
C607
1.5pF
R603
33
C659
3.3pF
FL600
45J93
R655
1K
13K
R651
270
R654
R601
18K
R604
270
2
1
33nH
L605
C610
C613
68pF
68pF
390nH
L604
100nH
L606
L602
100nH
Q603
4
2
5
3
2.7pF
C605
68pF
C621
CR601
0.1uF
CR600
C622
0.1uF
R650
22K
C612
12K
R600
NU
0.1uF
C657
6.8pF
C602
L653
C668
R656
680
100nH
NU
C611
C617
2.2uF
68pF
C662
0.1uF
68pF
C618
14
VCC_BUFFERS
18
VCC_LOGIC
C619
7
RX_SWITCH
3
SUPER_FLTR
19
TRB_IN
16
TX_BASE
15
TX_EMITTER
1
TX_IADJ
10
TX_OUT
13
TX_SWITCH
11
GND_BUFFERS
9
GND_FLAG
GND_LOGIC
17
12
PRESC_OUT
5
RX_BASE
6
RX_EMITTER
2
RX_IADJ
8
RX_OUT
50U54
U600
4
COLL_RFIN
20
FLIP_IN
C658
13pF
C609
51pF
C654
68pF
C660
3.3pF
R653
C608
33
1.5pF
CR603
VSF
AUX3_5V
PRESC
AUX4
VCTRL
RX_LO
TX_INJ
L601
L651
18nH
6.8pF
22nH
C606
C655
330
2.7pF
R605
Rx_sw
Tx_sw
Tx_sw
Rx_sw
Figure 5-24. 700 MHz Voltage Controlled Oscillator Schematic Diagram
Summary of Contents for HT1250-LS+
Page 10: ...viii ...
Page 12: ...x Product Safety and RF Exposure Compliance ...
Page 16: ...1 4 Introduction ...
Page 58: ...4 22 Maintenance ...
Page 64: ...5 6 Schematic Diagrams Overlays and Parts Lists ...