參數(shù)資料
型號(hào)： DS2151
英文描述： T1 Single-Chip Transceiver
中文描述： T1單芯片收發(fā)器
文件頁(yè)數(shù)： 33/51頁(yè)
文件大?。?/td> 1100K
代理商： DS2151
DS2151Q
33 of 51
1=jitter attenuator disabled
TPD
LICR.0
Transmit Power Down
.
0=normal transmitter operation
1=powers down the transmitter and 3-states the TTIP and
TRING pins
12.1 Receive Clock and Data Recovery
The DS2151Q contains a digital clock recovery system. See the DS2151Q Block Diagram in Section 1
and Figure 12-1 for more details. The DS2151Q couples to the receive T1 twisted pair via a 1:1
transformer. See Table 12-3 for transformer details. The DS2151Q automatically adjusts to the T1 signal
being received at the RTIP and RRING pins and can handle T1 lines from 0 feet to over 6000 feet in
length. The crystal attached at the XTAL1 and XTAL2 pins is multiplied by 4 via an internal PLL and
fed to the clock recovery system. The clock recovery system uses both edges of the clock from the PLL
circuit to form a 32 times oversampler which is used to recover the clock and data. This oversampling
technique offers outstanding jitter tolerance (see Figure 12-2). The EGL bit in the Line Interface Control
Register is used to limit the sensitivity of the receiver in the DS2151Q. For most CPE applications, a
receiver sensitivity of -30 dB is wholly sufficient and hence the EGL bit should be set to 1. In some
applications, more sensitivity than -30 dB may be required and the DS2151Q will allow the receiver to go
as low as -36 dB if the EGL bit is set to 0. However, when the EGL bit is set to 0, the DS2151Q will be
more susceptible to crosstalk and its jitter tolerance will suffer.
Normally, the clock that is output at the RCLK pin is the recovered clock from the T1 AMI waveform
presented at the RTIP and RRING inputs. When no AMI signal is present at RTIP and RRING, a
Receive Carrier Loss (RCL) condition will occur and the RCLK can be sourced from either the ACLKI
pin or from the crystal attached to the XTAL1 and XTAL2 pins. The DS2151Q will sense the ACLKI
pin to determine if a clock is present. If no clock is applied to the ACLKI pin, then it should be tied to
RVSS to prevent the device from falsely sensing a clock. See Table 12-1. If the jitter attenuator is either
placed in the transmit path or is disabled, the RCLK output can exhibit short high cycles of the clock.
This is due to the highly oversampled digital clock recovery circuitry. If the jitter attenuator is placed in
the receive path (as is the case in most applications), the jitter attenuator restores the RCLK to being close
to 50% duty cycle. Please see the Receive AC Timing Characteristics in Section 14 for more details.
SOURCE OF RCLK UPON RCL
Table 12-1
ACLKI PRESENT
RECEIVE SIDE JITTER
ATTENUATOR
ACLKI via the jitter attenuator
centered crystal
TRANSMIT SIDE JITTER
ATTENUATOR
ACLKI
TCLK via the jitter attenuator
Yes
No
12.2 Transmit Waveshaping and Line Driving
The DS2151Q uses a set of laser-trimmed delay lines along with a precision Digital-to-Analog Converter
(DAC) to create the waveforms that are transmitted onto the T1 line. The waveforms created by the
DS2151Q meet the latest ANSI, AT&T, and CCITT specifications. See Figure 12-3. The user will select
which waveform is to be generated by properly programming the L0 to L2 bits in the Line Interface
Control Register (LICR).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS2151DK 功能描述:KIT TRANSCEIVER T1 DESIGN DS2151 RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 過(guò)時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類(lèi)型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
DS2151K 功能描述:IC TXRX T1 1-CHIP 5V 44-PLCC RoHS:否 類(lèi)別:集成電路 (IC) >> 接口 - 電信 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:*
DS2151Q 制造商:DAL 功能描述:2151 DAL'95 NOTES 制造商:Maxim Integrated Products 功能描述:PCM TRANSCEIVER, Single, T-1(DS1), 44 Pin, Plastic, PLCC
DS2151Q/T&R 制造商:Maxim Integrated Products 功能描述:IC TXRX T1 1-CHIP 5V LP 44-PLCC
DS2151Q/T&R 功能描述:IC TXRX T1 1-CHIP 5V LP 44-PLCC RoHS:否 類(lèi)別:集成電路 (IC) >> 接口 - 電信 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:*
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