w681512 Winbond Electronics Corp America, w681512 Datasheet - Page 9

• Manufacturer Part Number: w681512
• Description: Single-channel Voiceband Codec
• Manufacturer: Winbond Electronics Corp America

as an input when AI+ is tied to V
Table 7.1).
When the input amplifier is powered down, the input signal at AO or AI- needs to be referenced to the
analog ground voltage V
The output of the input amplifier is fed through a low-pass filter to prevent aliasing at the switched
capacitor 3.4 kHz low pass filter. The 3.4 kHz switched capacitor low pass filter prevents aliasing of
input signals above 4 kHz, due to the sampling at 8 kHz. The output of the 3.4 kHz low pass filter is
filtered by a high pass filter with a 200 Hz cut-off frequency. The filters are designed according to the
recommendations in the G.712 ITU-T specification. From the output of the high pass filter the signal is
digitized. The signal is converted into a compressed 8-bit digital representation with either μ-Law or A-
Law format. The μ-Law or A-Law format is pin-selectable through the μ/A-Law pin. The compression
format can be selected according to Table 7.2.
The digital 8-bit μ-Law or A-Law samples are fed to the PCM interface for serial transmission at the
data rate supplied by the external BCLKT.
The 8-bit digital input samples for the D-to-A path are serially shifted in by the PCM interface and
converted to parallel data bits. During every cycle of the frame sync FSR, the parallel data bits are fed
through the pin-selectable μ-Law or A-Law expander and converted to analog samples. The mode of
expansion is selected by the μ/A-Law pin as shown in Table 7.2. The analog samples are filtered by a
low-pass smoothing filter with a 3.4 kHz cut-off frequency, according to the ITU-T G.712 specification.
A sin(x)/x compensation is integrated with the low pass smoothing filter. The output of this filter is
buffered to provide the differential receive output signals RO+ and RO-. The RO+ or RO- outputs can
be externally connected to the PAI pin to provide a differential output with high driving capability at the
PAO+ and PAO- pins. By using external resistors (see section 11 for examples), various gain settings
7.2. Receive Path
AI+
V
1.2 to V
V
DD
SS
μ/A-Law Pin
V
V
SS
DD
DD
AG
-1.2
.
Table 7.2. Pin-selectable Compression Format
Table 7.1 Input Amplifier Modes of operation
DD
and the AI- pin is selected as an input when AI+ is tied to V
Input Amplifier
Powered Down
Powered Up
Powered Down
- 9 -
Format
A-Law
μ-Law
Input
AO
AI+, AI-
AI-
Publication Release Date: April, 2007
W681512
Revision C14
SS
(see