Z0220112VEGR4078 Zilog, Z0220112VEGR4078 Datasheet - Page 51

• Manufacturer Part Number: Z0220112VEGR4078
• Description: IC MODEM 2400BPS DSP AFE 44-PLCC
• Manufacturer: Zilog

Specifications of Z0220112VEGR4078

• Data Format: V.21, V.22, V.23, Bell 103, Bell 212A
• Baud Rates: 2.4k
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 44-LCC (J-Lead)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 20. Modem Data Pump Word Definitions (Continued)
PS000904-0107
Register & Address
(hex)
DTMFh_lev
DTMFl_lev
ToneGenA
ToneGenB
TxLevel
Seq3Count
Seq2Count
0185
01A1 –6 dBm
0191 —
0196 —
01A0 –9 dBm
18E None
18D 95 msec
Default
Value
–10 dBm Transmit Power Level
Function and Explanation
DTMF Transmit Level — High Band
DTMF Transmit Level — Low Band
These are the transmit levels for the DTMF low band (DTMFl_lev)
and DTMF high band (DTMFh_lev) frequencies. The levels are set
by the following formula where lev is specified in dBm and less or
equal to 0:
Change in value takes effect in 0.1 msec. The data pump sets these
locations to their default values at any reset.
Tone Generator A
Tone Generator B
The data pump has two independent tone generators, each
simultaneously generating a pure tone with its own transmit level
when Config register, bits 0–6 (MODE) is 1 (transmit tones). The
outputs of the tone generators are mixed together. The generated
frequencies are set by writing a coefficient to location ToneGenA or
ToneGenB. The coefficient is defined as the following: where f is the
frequency of the tone to be generated:
The transmit levels for tone generators A and B are set in locations
DTMFl_lev and DTMFh_lev, respectively. See “Transmitting Tones”
for more information including a description of setting the tone
transmission levels.
To sets the transmit power level, use the following formula where
power is specified in dBm and less than or equal to –6:
Change in value takes effect at the end of the baud period.
Dial Timer Inter-Pulse Count
Dial Timer Off Count
DTMFlev
TxLevel
V.22BIS Data Pump with Integrated AFE
coeff x
=
=
=
10
10
See Seq1Count
See Seq1count
2π f ⋅
------------ 4096
(
9600
power
(
lev
) 20
⋅
) 20
⁄
⁄
⋅
⋅
32767
2048
47