Z02215
Single Chip Modem with Integrated Controller, Data Pump, and AFE
64
Table 19. Analog Characteristics
Parameter Minimum Typical Maximum Units
Description
Input impedance of transformer interface
3 dB point of transformer interface
1
2
3
400
21
1200
26.5
82
–
W
32.5
90
kHz
pF
External integration capacitance Type NPO
(COG)
73
Note: NPO and COG are synonymous terms for an industry standard dielectric material used for ceramic capacitors
which provides a very low temperature coefficient of capacitance (±30 ppm per °C) and voltage coefficient of
capacitance (under 0.01% per Volt). It also has a low dissipation factor (0.1% max at 1 MHz for the values of
interest).
Analog Inputs: Type AI
AC Characteristics
Symbol
Minimum Typical
Maximum Units
Input Impedance (DC
Z
15K
25K
–
Ω
IN
to V
)
REF
Power Supply
Rejection
PSRRi
40
–
–
dB
Input Current
Ii
–80
–
–
–
80
mA
Idle Channel Noise
ICNi
–72
dBm
(3950 Hz Bandwidth)
Signal to Distortion
STDi
30
–
–
dB
The characteristics below are provided for information only. They are not tested
except in the functional test vectors.
Characteristics
Input Capacitance
Input Bias
Symbol
Minimum Typical
Maximum Units
C
–
10
+2.5
–
–
pF
V
IN
V
V
–
–
DCOFF
PKI
Analog Input Voltage
(peak differential), (23)
–2.362
+2.362
V
Analog Input Voltage
(per RXI+. RXI– pin)
V
–1.181
–
+1.181
V
PKIP
PS001907-0904
Analog Inputs: Type AI
ZILOG [ ZILOG, INC. ]
