参数资料
型号: DS2153Q-A7+T&R
厂商: Maxim Integrated Products
文件页数: 36/60页
文件大小: 0K
描述: IC TXRX E1 1-CHIP 5V 44-PLCC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 500
功能: 单芯片收发器
接口: E1
电路数: 1
电源电压: 4.75 V ~ 5.25 V
电流 - 电源: 65mA
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 44-LCC(J 形引线)
供应商设备封装: 44-PLCC(16.59x16.59)
包装: 带卷 (TR)
DS2153Q
41 of 60
13.2 Transmit Waveshaping and Line Driving
The DS2153Q 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 E1 line. The waveforms created by the
DS2153Q meet the ITU specifications. See Figure 13-3. 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). The
DS2153Q can set up in a number of various configurations depending on the application. See Table 13-2
Table 13-2. LBO Select in LICR
L2
L1
L0
APPLICATION
TRANSFORMER
RETURN LOSS
(dB)
Rt (
)
0
75
normal
1:1.15 step-up
N.M.
0
1
120
normal
1:1.15 step-up
N.M.
0
1
0
75
normal with protection
resistors
1:1.15 step-up
N.M.
8.2
0
1
120
normal with protection
resistors
1:1.15 step-up
N.M.
8.2
1
0
75
with high return loss
1:1.15 step-up
21
27
1
0
75
with high return loss
1:1.36 step-up
21
18
1
0
120
with high return loss
1:1.36 step-up
21
27
N.M. = not meaningful
Due to the nature of the design of the transmitter in the DS2153Q, very little jitter (less than 0.005UIP-P
broadband from 10Hz to 100kHz) is added to the jitter present on TCLK. Also, the waveforms that they
create are independent of the duty cycle of TCLK. The transmitter in the DS2153Q couples to the E1
transmit shielded twisted pair or coax via a 1:1.15 or 1:1.36 step-up transformer as shown in Figure 13-1.
For the devices to create the proper waveforms, the transformer used must meet the specifications listed
Table 13-3. Transformer Specifications
SPECIFICATION
RECOMMENDED VALUE
Turns Ratio
1:1 (receive) and 1:1.15 or 1:1.36 (transmit)
±5%
Primary Inductance
600
H minimum
Leakage Inductance
1.0
H maximum
Intertwining Capacitance
60pF maximum
DC Resistance
1.2
maximum
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