SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 184

• Manufacturer Part Number: SI2493-C-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FS

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN93
184
Connect the prototype ground to the EVB ground
Lift prototype and EVB C1 and C2 to decouple the line side from the DSP side. Repeat this on the evaluation board.
Connect prototype system C1 and C2 to the Si3008 pad of EVB C1 and C2
Connect the phone line to the RJ11 jack on the EVB
Run the prototype system software to attempt a modem connection
Controller
Host
0.54 V
0.88 V
2.3 V
1.0 V
EVB
Transceiver
Figure 50. Si3008 In-Circuit Resistance to IGND (Si3008 Pin 9)
RS232
UART
Resistance measured with power and phone line removed
Voltages measured with respect to IGND (Si3008 pin 9)
Host
C2B
C1B
VREG
CID
On-Hook
Figure 48. Verify Prototype Si3008 Failure
1.6 M
VREG2
2.7 M
2.7 M
480 k
Figure 49. Si3008 Typical Voltages
Si24xx
Si24xx
DCT2
DCT3
QE2
Ω
Ω
Ω
Ω
C2B
CID
C1B
VREG
0.06 V
0.52 V
0.04 V
0.05 V
C1
C1
C2
C2
Rev. 0.9
N/A
2.3 V
1.0 V
N/A
DCT
QE
QB
Rx
180 k
2.6 M
1.4 M
1.4 M
C2B
CID
C1B
VREG
Si3008
Si3008
Off-Hook
Ω
Ω
Ω
Ω
Prototype System
DCT
QE
QB
Rx
Discretes
Discretes
2.3 V
1.7 V
1.1 V
3.0 V
To
Phone
Line