DS21352L+ Maxim Integrated Products, DS21352L+ Datasheet - Page 85

• Manufacturer Part Number: DS21352L+
• Description: IC TXRX T1 1-CHIP 3.3V 100-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21352L+

• Function: Single-Chip Transceiver
• Interface: HDLC, T1
• Number Of Circuits: 1
• Voltage - Supply: 3.14 V ~ 3.47 V
• Current - Supply: 75mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Includes: DSX-1 and CSU Line Build-Out Generator, HDLC Controller, In-Band Loop Code Generator and Detector
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -

Figure 16-1 EXTERNAL ANALOG CONNECTIONS
Table 16-2 TRANSMIT TRANSFORMER SELECTION
DEVICE
DS21552
DS21352
See separate application note on line interface design criteria for full details.
NOTES:
1. Resistor values are +/-1%.
2. The Rt resistors are used to protect the device from over–voltage.
3. See the Separate Application Note for details on how to construct a protected interface.
4. Normally a TTL level clock is applied MCLK and the XTAL pin is left as an NC. Optionally a crystal can be applied across
the MCLK and XTALD pins.
Table 16-3 TRANSFORMER SPECIFICATIONS
SPECIFICATION
Turns Ratio DS21352
Turns Ratio DS21552
Primary Inductance
Leakage Inductance
Intertwining Capacitance
DC Resistance
T1 Transmit
T1 Receive
Line
Line
(see table below)
1 : 1
N : 1
TRANSFORMER
1.15 : 1
1.36 : 1
2 : 1
0.1uF
Rt
Rt
50
RECOMMENDED VALUE
1:1(receive) and1:2(transmit) 5%
1:1(receive) and1:1.15 or1:1.36(transmit) 5%
600mH minimum
1.0mH maximum
40 pF maximum
1.2 Ohms maximum
polarized)
0.47uF
85 of 137
(non-
50
TTIP
TRING
RTIP
RRING
DS21352 / 552
RESISTOR Rt
0 ohms Ideal, 2.2 ohms max
4.7 ohms Ideal
0 ohms
XTALD
MCLK
DVDD
RVDD
DVSS
TVDD
RVSS
TVSS
0.01uF
DS21352/DS21552
0.1uF
0.1uF
0.1uF
NC
1.544MHz
VDD