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CM L M icrocircuits
COMMUNICATION SEMICONDUCTORS
High Resolution
Circuit Diagrams for DE8781 and DE8782
Complementary to CML User Manual: UM8780 August 2003
(c) 2003 CML Microcircuits
Power Extraction
D1 CBRHD-04
LPLUS
3
J1 RJ11SKT
1 2 3 4 5 6
VLCL
AC AC
1
2
VIN
JP1
R4 100k
B
Q1 BTA92
R4A 100k R10 100k
B
F1 1A25
E1 P3100SC R33 470k
R5 220k R8 100k M1 VN4012L C9 100nF
VSTBY+
B
Q1A BTA92
Q3 BTA92
VLCL
R5A 220k M1A VN4012L
R9 100k D7 BZX84 5V6 C33 n/f
C19 100nF (250v)
C20 100nF (250v) R26 470k C22 n/f D6 R27 470k D5 BAS16
Q2 BTA42
JP2
R6 470k
ADCIN
GPOP1
R11 2k7 D20 6V2
R7 15k
C18 3u3F
AVDD
BAS16
AC AC
Ring Detection
D2 CBRHD-04
R30 1M C21 150nF C8 100nF
C4 22uF C5 100nF
MOD
Signal Interface
C13 220nF R23 91k R24 100k R25 160k
R22 3k C15 100nF C16 47nF(300V) R21 3k C14 10nF C23 220nF(16V)
R16 10k
R28 470k
RXIN
C17 100pF
RXFB
D8 BZX84 4V7
R13 10k
Gyrator
1
R29 68k
D31 BZX84 n/f 22pF C2
GYON
Q4 FZT757
11M0592Hz X1 22pF C1
ICTRL
M2 VN4012L
Q5 BTA42
J4:A J4:B J4:C J4:D
DVDD
R64 R65 330R 330R R66 330R
GPOP1 GPOP2 GPOP3 AVDD
R2 30R C6 22uF
C3
DVDD
100nF C7 100nF
ADCIN
J4:E
R14 27R(0W5)
R17 n/f
n/f
R19 470R Q6
J2
1 2
TP3
VLCL AVSS
TP4
AVSS
DVDD
R1 100k R15A n/f R15 0R C10 n/f R18 n/f C11 n/f R20 10k C12 3u3F
SNPSKT2
Place decoupling capacitors C4, C5, C6, C7 and C8 as close to CMX878 pins as possible.
GNDANALOG
LMINUS
Off-hook AC impedance
CTR21 I limit
DE8781, sheet 1
DVDD
MCLR
Brown-out Detection optional
U6 MAX6377 2V2
TP2 DVSS R34 270R SW1
RESET VPP
TP1 DVSS
OUTN 2
R92
VSTBY
Isolation barrier.
430R
All diodes on this side are BAS16.
C27 1nF C28 10nF R78 1M R79 1M R80 1M R81 1M R82 1M R83 1M
U2
1 /MCLR/Vpp 2 RA0/AN0 3 RA1/AN1 4 RA2/AN2 5 RA3/AN3/Vref 6 RA4/T0CKI 7 RA5//SS/AN4 8 VSS 9 OSC1/CLKIN 10 OSC2/CLKOUT 11 12 13 14 RC0/T1OSO/T1CKI RC1/T1OSC/CCP2 RC2/CCP1 RC3/SCK/SCL RB7 28 RB6 27 RB5 26 RB4 25 RB3 24 RB2 23 RB1 22 RB0/INT 21 VDD 20 VSS 19 RC7/RX/DT RC6/TX/CK RC5/SDO RC4/SDI/SDA 18 17 16 15
SW2
WAKE DVDD
8
U3:A PC827
1
R60 6k8 D26 TP5
DVDD
R52 R86 1M R87 1M R93 1M R88 1M
DTRN
R51 100k
R84
DVDD
5M6 M11 BSS138LT1
WAKE
7
2
1M R85 1M
D32
U4:B PC827 DVDD CTSN
3 6
HOST-HI
R59 1k8
4
5
D27 R62
J3:3 J3:4 J3:5 J3:6 J3:8 J3:16
R67 R68 R69 R70 R71 R72
220R 220R 220R 220R 220R 220R
BER_RXDCLK BER_RXD BER_TXDCLK BER_TXD BOOT_PWR
R97 R94 R95
n/f 220R 220R J3:10 J3:7
RXD U4:A PC827 DVDD
1 8
HOST-HI
10k
C25 27pF C26 27pF X2 4MHz
IRQN DVDD
47nF C24
D23 R56 2k7
R54 1k8
2
7
CDATA RDATA
DVDD
R55 2k7
U3:B PC827
6 3
PIC16LF876SO
R57 6k8
JP4
2 1 3
J3:14 J3:12
R73 R96
220R 220R 1M 1M 1M 1M R77 R74 R75 R76
CSN SCLK
DVDD
1M 1M 1M
R89 R90 R91
TXD
5
4
D24
DVDD
U5:B PC827 DVDD RIN
3 6
HOST-HI
1 2 3 4 5 6 7 8 9
J5
R61 1k8
4
5
D30
R63 10k
J3:1
MCLR CTSN TXD VPP
1 2 3 4 5
DVDD
DVDD
DB9F_CML TP6
J6:A J6:B J6:C J6:D J6:E
J3:2
In circuit serial programming for PIC
J3:9 J3:11 J3:13 J3:15
C31 1uF
C32 1uF
Place:C31 adjacent to U4 pin1. C32 adjacent to R55.
HGND
DE8781, sheet 2
Power Extraction
D1 CBRHD-04
LPLUS
3
J1 RJ11SKT
1 2 3 4 5 6
VLCL
AC AC
1
2
VIN
JP1
R4 100k
B
Q1 BTA92
R4A 100k R10 100k
B
F1 1A25
E1 P3100SC R33 470k
R5 220k R8 100k M1 VN4012L C9 100nF
VSTBY+
B
Q1A BTA92
Q3 BTA92
VLCL
R5A 220k M1A VN4012L
R9 100k D7 BZX84 5V6 C33 n/f
C19 100nF (250v)
C20 100nF (250v) R26 470k C22 n/f D6 R27 470k D5 BAS16
Q2 BTA42
JP2
R6 470k
ADCIN
GPOP1
R11 2k7 D20 6V2
R7 15k
C18 3u3F
AVDD
BAS16
AC AC
Ring Detection
D2 CBRHD-04
R30 1M C21 150nF C8 100nF
C4 22uF C5 100nF
MOD
Signal Interface
C13 220nF R23 100k R24 100k R25 160k
R22 2k7 C15 100nF C16 47nF(300V) R21 3k3 C14 10nF C23 220nF(16V)
R16 10k
R28 470k
RXIN
C17 100pF
RXFB
D8 BZX84 4V7
R13 10k
Gyrator
1
R29 68k
D31 BZX84 n/f
GYON
Q4 FZT757
11M0592Hz X1 22pF 22pF C2 C1
ICTRL
M2 VN4012L
Q5 BTA42
J4:A J4:B J4:C J4:D
DVDD
R64 R65 330R 330R R66 330R
GPOP1 GPOP2 GPOP3 AVDD
R2 30R C6 22uF
C3
DVDD
100nF C7 100nF
ADCIN
J4:E
R14 12R (0W6)
R17 5k6 Q6 BC846
R19 470R
J2
1 2
TP3
VLCL AVSS
TP4
AVSS
DVDD
R1 100k R15A 36R(0W6) R15 n/f C10 3u3F R18 2k C11 33uF R20 10k C12 3u3F
SNPSKT2
Place decoupling capacitors C4, C5, C6, C7 and C8 as close to CMX878 pins as possible.
GNDANALOG
LMINUS
Off-hook AC impedance
CTR21 I limit
DE8782, sheet 1
DVDD
MCLR
Brown-out Detection optional
U6 MAX6377 2V2
TP2 DVSS R34 270R SW1
RESET VPP
TP1 DVSS
OUTN 2
R92
VSTBY
Isolation barrier.
430R
All diodes on this side are BAS16.
C27 1nF C28 10nF R78 1M R79 1M R80 1M R81 1M R82 1M R83 1M
U2
1 /MCLR/Vpp 2 RA0/AN0 3 RA1/AN1 4 RA2/AN2 5 RA3/AN3/Vref 6 RA4/T0CKI 7 RA5//SS/AN4 8 VSS 9 OSC1/CLKIN 10 OSC2/CLKOUT 11 12 13 14 RC0/T1OSO/T1CKI RC1/T1OSC/CCP2 RC2/CCP1 RC3/SCK/SCL RB7 28 RB6 27 RB5 26 RB4 25 RB3 24 RB2 23 RB1 22 RB0/INT 21 VDD 20 VSS 19 RC7/RX/DT RC6/TX/CK RC5/SDO RC4/SDI/SDA 18 17 16 15
SW2
WAKE DVDD
8
U3:A PC827
1
R60 6k8 D26 TP5
DVDD
R52 R86 1M R87 1M R93 1M R88 1M
DTRN
R51 100k
R84
DVDD
5M6 M11 BSS138LT1
WAKE
7
2
1M R85 1M
D32
U4:B PC827 DVDD CTSN
3 6
HOST-HI
R59 1k8
4
5
D27 R62
J3:3 J3:4 J3:5 J3:6 J3:8 J3:16
R67 R68 R69 R70 R71 R72
220R 220R 220R 220R 220R 220R
BER_RXDCLK BER_RXD BER_TXDCLK BER_TXD BOOT_PWR
R97 R94 R95
0R 220R 220R J3:10 J3:7
RXD U4:A PC827 DVDD
1 8
HOST-HI
10k
C25 27pF C26 27pF X2 4MHz
IRQN DVDD
47nF C24
D23 R56 2k7
R54 1k8
2
7
CDATA RDATA
DVDD
R55 2k7
U3:B PC827
6 3
PIC16LF876SO
R57 6k8
JP4
2 1 3
J3:14 J3:12
R73 R96
220R 220R 1M 1M 1M 1M R77 R74 R75 R76
CSN SCLK
DVDD
1M 1M 1M
R89 R90 R91
TXD
5
4
D24
DVDD
U5:B PC827 DVDD RIN
3 6
HOST-HI
1 2 3 4 5 6 7 8 9
J5
R61 1k8
4
5
D30
R63 10k
J3:1
MCLR CTSN TXD VPP
1 2 3 4 5
DVDD
DVDD
DB9F_CML TP6
J6:A J6:B J6:C J6:D J6:E
J3:2
In circuit serial programming for PIC
J3:9 J3:11 J3:13 J3:15
C31 1uF
C32 1uF
Place:C31 adjacent to U4 pin1. C32 adjacent to R55.
HGND
DE8782, sheet 2

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