Si3220/Si3225
Table 6. Linefeed Characteristics
(VDD, VDD1–VDD4 = 3.13 to 5.25 V, TA = 0 to 70 °C for K/F-Grade, –40 to 85 °C for B/G-Grade)
Parameter
Symbol
Test Condition
Min Typ Max Unit
2
Maximum Loop Resistance (adaptive
R
R
= 430 Ω,
1870
—
—
Ω
LOOP
DC,MAX
1
linefeed disabled )
I
= 18 mA, V
= –52 V,
BAT
LOOP
ABIAS = 8 mA
VOCDELTA = 0
2
Maximum Loop Resistance (adaptive
R
R
= 430 Ω,
DC,MAX
2030
—
—
Ω
LOOP
1
linefeed enabled )
I
= 18 mA, V
= –52 V,
BAT
LOOP
ABIAS = 8 mA
VOCDELTA ≠ 0
DC Loop Current Accuracy
I
= 18 mA
—
—
—
—
±10
±4
%
V
LIM
DC Open Circuit Voltage Accuracy
Active Mode; V = 48 V,
OC
V
– V
RING
TIP
DC Differential Output Resistance
R
I
< I
—
—
320
—
—
Ω
DO
LOOP
LIM
DC On-Hook Voltage Accuracy—Ground
Start
V
I
<I ; V wrt ground,
±4
V
OHTO
RING LIM RING
V
= –51 V
RING
DC Output Resistance—Ground Start
DC Output Resistance—Ground Start
Loop Closure Detect Threshold Accuracy
Ground Key Detect Threshold Accuracy
Ring Trip Threshold Accuracy
R
I
<I ; RING to ground
—
300
—
320
—
—
—
Ω
kΩ
%
ROTO
RING LIM
R
TIP to ground
TOTO
I
I
= 13 mA
= 13 mA
±10 ±15
±10 ±15
THR
—
%
THR
Si3220, ac detection,
VRING = 70 Vpk, no offset,
= 80mA
—
±4
±5
mA
I
TH
Si3220, dc detection,
—
—
±1.5 ±2
mA
20 V dc offset, I = 13 mA
TH
Si3225, dc detection,
—
±4.5 mA
48 V dc offset, R
= 1500 Ω
loop
3
Ringing Amplitude, Si3220
V
Open circuit, V
= 100 V
93
82
—
—
—
—
V
V
RING
BATH
PK
PK
5 REN load, R
= 0 Ω,
LOOP
V
= 100 V
BATH
Sinusoidal Ringing Total
Harmonic Distortion
R
—
2
—
%
THD
Ringing Frequency Accuracy
Ringing Cadence Accuracy
Calibration Time
f = 16 Hz to 100 Hz
Accuracy of ON/OFF times
↑CAL to ↓CAL bit
—
—
—
—
—
—
±1
%
±50 ms
600 ms
Notes:
1. Adaptive linefeed is enabled when the VOCDELTA RAM address is set to a non-zero value and is disabled when
VOCDELTA is set to 0.
2. RDC,MAX is the maximum dc resistance of the CPE; hence the specified total loop resistance is RLOOP + RDC,MAX
.
3. Ringing amplitude is set for 93 V peak using the RINGAMP RAM address and measured at TIP-RING using no series
protection resistance.
12
Rev. 1.0
SILICONIMAGE [ Silicon image ]
