Philips 32PFL8605H/12 Service Manual page 83

8.13 Diagram B08 820400089624 DVBS
Block diagram
Pinning information
Supply, LNBH23Q (IC 7T50)
ISEL ISEL
LX LX
Rsense Rsense
EN EN
VSEL VSEL
P-GND P-GND
Vup Vup
Linear Post-reg Linear Post-reg
+Modulator +Modulator
VoRX VoRX
+Protections +Protections
+Diagnostics +Diagnostics
VoTX VoTX
TTX TTX TTX
EXTM EXTM
DSQIN DSQIN
V CTRL V CTRL
1 n.c .
2 n.c .
3 n.c .
4 LX
5 P -G N D
6 S D A
7 n.c .
8 n.c .
9 S C L
10 A D DR
11 DS Q out
12 DS Q IN
13 E XTM
14 TTX
15 B Y P
16 n.c .
17 n.c .
18 V c c -L
19 V c c
20 A -G N D
21 V oRX
22 V oTX
23 n.c .
24 n.c .
25 n.c .
26 n.c .
27 V up
28 IS E L
29 D E TIN
30 V C TRL
31 n.c .
32 n.c .
Figure 8-13 Internal block diagram and pin configuration
IC Data Sheets
TTX TTX ADDR ADDR SDA SCL SDA SCL
VSEL VSEL
TTX TTX
I2C interface I2C interface
ITEST ITEST
VOUT Control VOUT Control
TEN TEN
I2C Diagnostics I2C Diagnostics
22KHz 22KHz 22KHz
Oscill. Oscill. Oscill.
22KHz Tone 22KHz Tone
Amp. Diagn. Amp. Diagn.
22KHz Tone 22KHz Tone
Freq. Detector Freq. Detector
LNBH23 LNBH23
A-GND A-GND
Epad Connected with power grounds and to
the ground layer through vias
to dissipate the heat.
back to
div. table
Q551.1E LA
Vcc Vcc Vcc Byp Byp Byp Vcc- Vcc- Vcc- L L L
Preregulator Preregulator
+U.V.lockout +U.V.lockout
+P.ON reset +P.ON reset
EN EN
DETIN DETIN
DSQOUT DSQOUT
8. EN 83
18770_306_100217.eps
100217
2010-Oct-01