HP 8340A Service Manual page 178

TP2 TP4 TP5
•••
LOCK LOOP 2 (PLL2) PHASE_ DETECTOR
(EJ
PHASE/FREQUENCY DETECTOR t5VR
R4
R3 1330
TP5
1000
QIO
U7A
+5VR
+5VR
+
�
-5VR R2 CI
RI !330 2.2
TP4
16 1000
I
l I
750
NC
CR I
R5
19GO
-7V
Pl"."" i 3,28UN) 4.7
+?.OVF
i
�
H64
0.1 2.2 348
VREG
1 1
OUT +5Vr<
+
2.2
L4 I
Pl-15,30CIN> 4. 7
+5Vf
i
C2 I
¢
,2.2
O. I
Pl-:1,3,G, IO,
ll,14_.16,18,21, I
22 25
f I
GND I R35
10
Pl-8 TP2
N2 TUNE I
RTN
PJ-7CIN)
-- 7V
-7V REF I
L2
P l-12,27(1N) 4,7
- IOVF
-JOV
� � CIT
CIS
+ 1.0
0.1
I
I
TPI
•
®
DIGITAL INTEGRATOR
r-COMPARATORS--._
+5VF
Rl7
Rl8
J2. IK
2150
CR4
TP I
R7
34 .eK
VR2 VR3
I JV
6. I IV 6,
___ \
\
\
I
R6 I
I
196 R9
Q3 I
IOK
0
R33
2610
Scans by HB9HCA and HB9FSX
TP3
•
UP-DOWN COUNTERS
rSW!TCHED OSCILLATORS,_
+5VF
U7B U7C us
5 15
6
4 :
NC 12
.IT
4 = +I ,CT,,, 1 5
I I
R20 GI [LOAD]
14 13
348 R -1,CT=O
CTRl6
i
+ C 11 1 5
I D [I]
1.0
I ,D [']
I
1,0 [4]
I D [8]
+5VF
R21
U9
16
348
12
�:+l,CT""l5
+ � 12 : � �
c
I [LO
1.0 � r. 13
C 0
I CTRIS
[I]
(2]
e
I
@
OUTPUT AMPLIFIER
C7
10
R 10
464K
R
I I
6190
INDICATOR
+5VF
R25
TOK
Cl4
.01
R26
1211<
-IDVF
TP6 TP7
• •
NOTES:
REFER
SECTION VIII FOR
r DAc, DETAILED SCHEl.!ATIC DIAGRAM
+20VF NOTES.
2. RESISTANCE VALUES ARE IN
OHMS, CAPACITANCE IN
UIO
MICROFARADS, AND INDUCTANCE
R23
IN
3160
OTHERWISE NOTED.
3. PINS
PACKAGE U2 HAVE NO INTERNAL
CONNECTION TO THE OP AMP
CIRCUIT,
IS ELECTRICALLY CONNECTED
TO U2
NC
OA.C 10
NC
IS
[RFB]
15
-7V [VREFl [II]
2
[12]
2
cg
.0047
N2 TUNE
U4
R 13
2150
C24 COVER
-IOVF 5000PF TP7 TEST
POINT
i
DET
�
OUT
I
+2DVF +!5VF
UI
R29
HUL2
R30
2150
+20VF C23 COVER
-IOVF 5000PF TP6 TEST
R2B
R27
422K
237K
(HIGH�
UNLOCKEO I
J
I
I
J
__
Figure BC-28. A41 PLI2 Phase Detector, Schematic Diagram
TO
THE BEGINNING OF
MICROHENRIES UNLESS
AND 4 OF OP AMP
2
THE GUARD TRACE
PINS 12.
2, 4 ,AND
8-247 /8-248