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| 型号： | AD73322LYR |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 通信及网络 |
| 英文描述： | Low Cost, Low Power CMOS General-Purpose Dual Analog Front End |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO28 |
| 封装： | MS-013AE, SOIC-28 |
| 文件页数： | 13/40页 |
| 文件大小： | 437K |
| 代理商： | AD73322LYR |
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REV. 0
AD73322L
–13–
Interpolation Filter
The anti-imaging interpolation filter is a sinc-cubed digital filter
that up-samples the 16-bit input words from the input sample
rate to a rate of DMCLK/8, while filtering to attenuate images
produced by the interpolation process. Its Z transform is given as:
[(1
–
Z
–
N
)/(1
–
Z
–
1
)]
3
where
N
is determined by the sampling rate (
N
= 32 @ 64 kHz .
. .
N
= 256 @ 8 kHz). The DAC receives 16-bit samples from
the host DSP processor at the programmed sample rate of
DMCLK/N. If the host processor fails to write a new value to
the serial port, the existing (previous) data is read again. The
data stream is filtered by the anti-imaging interpolation filter,
but there is an option to bypass the interpolator for the mini-
mum group delay configuration by setting the IBYP bit (CRE:5)
of Control register E. The interpolation filter has the same char-
acteristics as the ADC
’
s antialiasing decimation filter.
The output of the interpolation filter is fed to the DAC
’
s digital
sigma-delta modulator, which converts the 16-bit data to 1-bit
samples at a rate of DMCLK/8. The modulator noise-shapes
the signal so that errors inherent to the process are minimized in
the passband of the converter. The bit-stream output of the
sigma-delta modulator is fed to the single-bit DAC where it is
converted to an analog voltage.
Analog Smoothing Filter and PGA
The output of the single-bit DAC is sampled at DMCLK/8,
therefore it is necessary to filter the output to reconstruct the
low frequency signal. The decoder
’
s analog smoothing filter
consists of a continuous-time filter preceded by a third-order
switched-capacitor filter. The continuous-time filter forms part
of the output programmable gain amplifier (PGA). The PGA
can be used to adjust the output signal level from
–
15 dB to
+6 dB in 3 dB steps, as shown in Table IV. The PGA gain is
set by bits OGS0, OGS1 and OGS2 (CRD:4-6) in Control
Register D.
Table IV. PGA Settings for the Decoder Channel
OGS2
OGS1
OGS0
Gain (dB)
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
+6
+3
0
–
3
–
6
–
9
–
12
–
15
Differential Output Amplifiers
The decoder has a differential analog output pair (VOUTP and
VOUTN). The output channel can be muted by setting the
MUTE bit (CRD:7) in Control Register D. The output signal is
dc-biased to the codec
’
s on-chip voltage reference.
Voltage Reference
The AD73322L reference, REFCAP, is a bandgap reference
that provides a low noise, temperature-compensated reference
to the DAC and ADC. A buffered version of the reference is
also made available on the REFOUT pin and can be used to
bias other external analog circuitry. The reference has a default
nominal value of 1.2 V.
The reference output (REFOUT) can be enabled for biasing
external circuitry by setting the RU bit (CRC:6) of CRC.
INVERTING
OP AMPS
ANALOG
LOOP-BACK
SELECT
INVERT
SINGLE-
ENDED
ENABLE
GAIN
1
+6/
–
15dB
PGA
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
AD73322L
V
REF
VFBN1
ANALOG GAIN
TAP
0/38dB
PGA
Figure 9. Analog Input/Output Section
Analog and Digital Gain Taps
The AD73322L features analog and digital feedback paths
between input and output. The amount of feedback is deter-
mined by the gain setting which is programmed in the control
registers. This feature can typically be used for balancing the
effective impedance between input and output when used in
Subscriber Line Interface Circuit (SLIC) interfacing.
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|---|---|
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| AD73322L | KNOB, RT25; Series:29JF RoHS Compliant: Yes |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD73322LYR-REEL | 制造商:Analog Devices 功能描述: |
| AD73322LYR-REEL7 | 制造商:Analog Devices 功能描述: |
| AD73322LYRU | 制造商:Rochester Electronics LLC 功能描述:SPEECH AND TELEPHONY CODEC I.C. - Bulk 制造商:Analog Devices 功能描述: |
| AD73322LYRU-REEL | 制造商:Analog Devices 功能描述: |
| AD73322LYRUZ | 制造商:Analog Devices 功能描述:DUAL-CHANNEL, 3 V FRONT-END PROCESSOR FOR GENERAL PURPOSE AP - Rail/Tube |
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