IDT82V2048 データシートの表示（PDF） - Integrated Device Technology

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IDT82V2048

OCTAL T1/E1 SHORT HAUL LINE INTERFACE UNIT

Integrated Device Technology 

IDT82V2048 OCTAL T1/E1 SHORT HAUL LINE INTERFACE UNIT

INDUSTRIAL TEMPERATURE RANGES

corner frequency and the shortest FIFO length that can still meet jitter

attenuation requirements.

TABLE - 8. GAP WIDTH LIMITATION

FIFO Length

64 bit

32 bit

Max. Gap Width

56 UI

28 UI

TABLE - 9. OUTPUT JITTER SPECIFICATION

T1

AT&T Pub 62411

GR-253-CODE

TR-TSY-000009

E1

ITU-T G.736

ITU-T G.742

ITU-T G.783

ETSI CTR 12/13

TABLE - 10. TRANSFORMER SPECIFICATIONS

LINE INTERFACE CIRCUITRY

The transmit and receive interface RTIP/RRING and TTIP/TRING

connections provide a matched interface to the cable. Figure-12 shows

the appropriate external components to connect with the cable for one

transmit/receive channel. Table-11 summarizes the component values

based on the specific application.

TRANSMIT DRIVER POWER SUPPLY

All transmit driver power supplies must be 5.0V or 3.3V.

In E1 mode, despite of the power supply voltage, the 75Ω/120Ω

lines are driven through 9.5Ω series resistors and a 1:2 transformer.

In T1 mode, when 5.0V is selected, 100Ω lines are driven through

9.1Ω series resistors and a 1:2 transformer. When 3.3V, 100Ω lines are

driven through a 1:2 transformer. To optimize the power consumption of

the device, series resistors are removed in this case.

However, in harsh cable environment, series resistors are required to

improve the transmit return loss performance and protect the device

from surges coupling into the device.

Part No.

STD Temp. EXT Temp.

T1124

T1114

Electrical Specification @ 25 °C

Turns Ratio (Pri: sec±2%) OCL @ 25°C (mH MIN) LL (µH MAX)

Transmit Receive

Transmit Receive Transmit Receive

1:2CT 1CT:2

1.2

1.2

.6

.6

CW/W (pF MAX)

Transmit Receive

35

35

Package/

Schematic

TOU/3

TABLE - 11. EXTERNAL COMPONENTS VALUES

Component

RT

RR

Cp

D1 - D4

E1

T1

75Ω Coax

120Ω Twisted Pair

100Ω Twisted Pair VDDT = 5.0V

100Ω Twisted Pair VDDT = 3.3V

9.5Ω ± 1%

9.5Ω ± 1%

9.1Ω ± 1%

0Ω

9.31Ω ± 1%

15Ω ± 1%

12.4Ω ± 1%

12.4Ω ± 1%

2200pf

1000pf

Nihon Inter Electronics - EP05Q03L, 11EQS03L, EC10QS04, EC10QS03L; Motorola - MBR0540T1

A

RX Line

B

TX Line

•2:11•

•2:11•

• 1kΩ

0.22µF • RR

RR

• 1kΩ

RT

Cp 2

RT

VDDT

D4 ·

D3

VDDT

D2

·

D1

One of Eight Identical Channels

RTIPn

RRINGn

TTIPn

TRINGn

VDDDn

GNDTn

VDDT

•

0.1µF

•

68µF3

NOTE:

1. Pulse T1124 transformer is recommended to use in Standard (STD) operating temperature range (0° to 70°C), while Pulse T1114 transformer is recommended to use in Extended

(EXT) operating temperature range is -40° to +85°C. See Transformer Specifications Table for details.

2. Typical value. Adjust for actual board parasitics to obtain optimum return loss.

3. Common decoupling capacitor for all VDDT and GNDT pins.

Figure - 12. External Transmit/Receive Line Circuitry

19

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