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CS6420-CS Datasheet(PDF) 10 Page - Cirrus Logic

Part No. CS6420-CS
Description  FULL DUPLEX SPEAKERPHONE CHIP
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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CS6420
10
DS205PP2
stage allows gains of 0 dB, 6 dB, 9.5 dB, and 12 dB
to be added prior to the ADC input. The default
gain stage setting is 0 dB.
The signal at APO should not exceed 2.8 Vpp at the
default gain stage setting. If other gain stages are
used then the full-scale signal at APO must also
change. Table 1 shows full-scale voltages as mea-
sured at APO for given programmable gains:
Table 1. Full scale voltages for each gain stage.
MB provides a stable 3.5 VDC output from the on-
board voltage reference of the CS6420. MB may
not be connected to any load. MB serves to provide
decoupling for the internal 2.12 VDC bandgap ref-
erence, and must have a 0.1
µF and a 10 µF capac-
itor to ground for bypass. Noise on MB will
strongly influence the overall analog perfor-
mance of the CS6420.
The acoustic output, AO, should connect to a sin-
gle-pole low-pass RC network with a corner fre-
quency of 4 kHz, which will filter out-of-band
components. The maximum voltage swing at AO is
2.8 Vpp. AO is capable of driving down to a 10 kΩ
load.
Network Interface
The pins NI (pin 17) and NO (pin 4) make up the
Network Interface. The details of the Network In-
terface are shown in Figure 4.
NI is the input from the telephone network side into
the CS6420. The signal into NI must be low pass
filtered by a single-pole RC filter with a corner fre-
quency of 8 kHz.
A programmable analog gain stage (PGA) accessi-
ble through the Microcontroller Interface amplifies
signals received at NI. This gain stage allows gains
of 0 dB, 6 dB, 9.5 dB, and 12 dB to be added prior
to the ADC input. The default gain stage setting for
the network side is 0 dB.
The signal at NI should not exceed 2.8 Vpp at the
default gain stage setting. If other gain stages are
used then the full-scale signal at NI must also
change. Table 1 shows full-scale voltages as mea-
sured at NI for given programmable gains.
The output to the telephone network side, NO,
should connect to a single pole RC network with a
corner frequency at 4 kHz, which will filter out-of-
band components. The maximum swing NO is ca-
pable of producing is 2.8 Vpp. NO is capable of
driving down to a 10 k
Ω load.
Microcontroller Interface
Several control functions of the CS6420 are acces-
sible through its Microcontroller Interface, which
consists of three pins: DATA (pin 8), STROBE
(pin 7), and DRDY (pin 6). These inputs are intend-
ed to connect to the outputs of a microcontroller to
allow write-only access to the 16-bit Microcontrol-
ler Control Register (MCR).
The RST (pin 5) pin, which affects the entire inte-
grated circuit, is especially significant to the Micro-
controller Interface.
RST is used to place the
CS6420 into a known state of operation. Two sub-
types of reset are possible: cold reset and warm re-
set.
Description
The Microcontroller Interface is implemented by a
serial shift register gated by DRDY. The microcon-
troller begins the transaction by setting DRDY low
and STROBE low. The most significant bit (MSB),
Bit 15, of the 16-bit data word should be presented
to the DATA pin and then STROBE should be
brought high to shift the data bit into the CS6420.
STROBE should be brought low again so it is ready
Gain Setting
Full-scale Voltage
0 dB
2.8 Vpp
6 dB
1.4 Vpp
9.5 dB
0.94 Vpp
12 dB
0.71 Vpp




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