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Part: EPT7008AG
Category:
Description: Token Ring Transceiver Module
Company: PCA Electronics Inc.
Datasheet: Download EPT7008AG datasheet File size : 78 kB
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Datasheet text preview:
Token Ring Transceiver Module
ELECTRONICS INC.
EPT7008AG
· Optimized for Texas Instrument's TMS38054 · · Supports both UTP and STP Transmission · · Overvoltage Protection Circuit · · Complies with or exceeds IEEE 802.5 Requirements ·
Electrical Parameters @ 25° C
Impedance [Xmit/Rcv] Chip Side 600/150 Cable Side 150/100 1-16 MHz Xmit Rcv -1 -1 Insertion Loss (dB Max.) 32 MHz Xmit -7 36 MHz 1-6 MHz Rcv -18 Return Loss (dB Min.) 6-17 MHz Xmit -12 Rcv -15 17-25 MHz Xmit -10 Rcv -10 1-30 MHz Xmit -40 Rcv -40 Common Mode Rejection (dB Min.) 30-100 MHz Xmit Rcv -35 -30 100-200 MHz Xmit -10 Rcv -10 200-300 MHz Xmit -10 Rcv -10 -35 Crosstalk (dB Min.) 1-30 MHz
Rcv Xmit -1 -25
Rcv Xmit -1 -18
Schematic
PhPh+ Tx+ Vcc 2 13 14 12 11 .1µF
15 Ts+
Xmit Filter
Impedance Matching Network
16 Ts-
CMF
17 Tu18 Tu+ 19 Ch Gnd 23 Rs22 Rs+
Tx- 10 Gnd 2 9 Gnd 1 3 Rx+ 2
Vcc 1 1
CMF
21 Ru+ 20 Ru-
Rx- 4 PhRet 24
Package
A N Dim. Pin 1 I.D. PCA EPT7008AG Date Code P A B C D E F G H I J K L M N P Q Min. 1.290 .575 .300 1.110 .003 .100 .780 .015 .008 .090 0° .025
Dimensions
(Inches) Max. Nom. 1.310 .585 .320 Typ. .020 Typ. .800 .021 .012 Typ. 8° .045 .030 .100 .092 .800 (millimeters) Min. Max. Nom. 32.77 14.60 7.62 28.19 0.076 2.54 19.81 .381 .203 .228 0° .635 33.27 14.86 8.13 Typ. .508 Typ. 20.32 .533 .305 Typ. 8° 1.14 .762 2.54 2.34 20.32
B
Q
D C F J H E
M
K
L G I
PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343
CST7008Aa Rev. -
10/2/96
Product performance is limited to specified parameters. Data is subject to change without prior notice.
TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com
Token Ring Transceiver Module
ELECTRONICS INC.
EPT7008AG
The circuit below is a guideline for interconnecting PCA's EPT7008AG with a typical Token Ring PHY chip for 4 Mb/16Mb applications over STP or UTP cable. Further details of system design should be obtained from the specific chip manufacturer. Note that this module is optimized for a "current source" driver such as TMS38054. Only one type of cable should be driven by the module: either UTP or STP. If you are using 120 cable or desire to install only one RJ45 connector thus leaving the STP use with a dongle when needed, please refer to PCA part numbers EPT7066 or similar parts optimized for 120 cable. Note that there is no need for the receiver side filtering. So consider this a cost effective solution for almost all Token Ring applications using this chip or similar chips. The pull down resistors to chassis via a cap shown around the RJ45 connector have been known to suppress unwanted radiation that unused wires pick up from the immediate environment. This is specially true if driving UTP cable. Their placement and use are to be considered carefully before design is finalized. No specific recommendation is made here for phantom circuitry, implementation varies. Please note that additional emission control has been observed if both nodes of the phantom bypass capacitor on the transmit channel are pulled to the chassis ground via suitable capacitors. It is recommended that there be a neat separation of ground planes in the layout. It is generally accepted practice to limit the plane off at least 0.05 inches away from the chip side pins of EPT7008AG. There need not be any ground plane beyond this point. For best results, PCB designer should design the outgoing traces preferably to be 75/50, (as the case may be) balanced and well coupled to achieve minimum radiation from these traces.
Typical Application Circuit Connection to TMS38054 (or Equivalent)
RCVINA 38 4 2 Vcc1
+5V +5V
100
23 22
RCVINB
1(R) 6(G) DB-9 Connector 5(B) 9(O) Use only one connector 4 Rcv ± 5 3 X m i t± 6 1 2 7 8
37
1 24
PHRET
PHOUTA PHOUTB
50/2W
19
29 27
10µF 10µF
13
50/2W
Chassis Ground
16 15 21
14
TMS38054
+5V
11 3 12 10
20 18
RJ45
DROUTB DROUTA
31 32
300 300
EPT7008AG
17
+5V
Notes : 1. Pin 24 is left unconnected. Applications vary. Your system may have a phantom drive return detection circuit needing pin 24 to be connected separately. 2. Red line connections to DB-9 Connector are 75 impedance traces.
PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343
CST7008Ab Rev. -
10/2/96
TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com
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