參數(shù)資料
型號(hào)： PCM4222_07
英文描述： High-Performance, Two-Channel, 24-Bit, 216kHz Sampling Multi-Bit Delta-Sigma Analog-to-Digital Converter
中文描述： 高性能，雙通道，24位，216kHz的采樣多位Δ-Σ模擬到數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 18/40頁(yè)
文件大小： 609K
代理商： PCM4222_07
www.ti.com
100
m
F
+
10-100nF
+
10-100nF
+
100
m
F
AGND
AGND
+
VREFR
REFGNDR
REFGNDL
VREFL
46
47
14
15
PCM4222
COMMON-MODE VOLTAGE OUTPUTS
The PCM4222 includes two dc common-mode voltage outputs, VCOML (pin 13) and VCOMR (pin 48), which
correspond to the left and right input channels, respectively. The common-mode voltage is utilized to bias
internal op amps within the modulator section of the PCM4222, and may be used to bias external input circuitry
when proper design guidelines are followed. The common-mode voltages are derived from the VCC1 and VCC2
analog power supplies using internal voltage dividers. The voltage divider outputs are buffered and then routed
to internal circuitry and the VCOML and VCOMR outputs.
The common-mode output voltage is nominally equal to (0.4875
×
VCC1) for VCOMR and (0.4875
×
VCC2) for
VCOML. Given an analog supply voltage of +4.0V connected to both VCC1 and VCC2, the resulting
common-mode voltages are +1.95V.
VCOML
or
VCOMR
PCM4222
Precision, Low-Noise Op Amp
(
OPA227
or equivalent)
To
Bias Nodes
R
(Optional)
Direct Connect to
High-Z Bias Node
(Z > 10M )
W
100nF to 1
m
F
Close to IC pins
PCM4222
SBAS399A–OCTOBER 2006–REVISED MARCH 2007
PRODUCT INFORMATION (continued)
Figure 38. Recommended Reference Capacitor Connections and Values
The common-mode voltage outputs have limited drive capability. If multiple bias points are to be driven, or the
external bias nodes are not sufficiently high impedance, an external output buffer is recommended.
Figure 39
shows a typical buffer configuration using the
OPA227
. The op amp utilized in the buffer circuit should exhibit
low dc offset and drift characteristics, as well as low output noise.
Figure 39. Common-Mode Output Connections
18
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