參數(shù)資料
型號(hào)： PCA8591T
廠商： NXP Semiconductors N.V.
英文描述： 8-bit A/D and D/A converter
中文描述： 8位A / D和D / A轉(zhuǎn)換器
文件頁(yè)數(shù)： 12/28頁(yè)
文件大?。?/td> 221K
代理商： PCA8591T
1998 Jul 02
12
Philips Semiconductors
Product specification
8-bit A/D and D/A converter
PCF8591
7.5
Reference voltage
For the D/A and A/D conversion either a stable external
voltage reference or the supply voltage has to be applied
to the resistor divider chain (pins V
REF
and AGND).
The AGND pin has to be connected to the system analog
ground and may have a DC off-set with reference to V
SS
.
A low frequency may be applied to the V
REF
and AGND
pins. This allows the use of the D/A converter as a
one-quadrant multiplier; see Chapter 15 and Fig.6.
The A/D converter may also be used as a one or two
quadrant analog divider. The analog input voltage is
divided by the reference voltage. The result is converted to
a binary code. In this application the user has to keep the
reference voltage stable during the conversion cycle.
7.6
Oscillator
An on-chip oscillator generates the clock signal required
for the A/D conversion cycle and for refreshing the
auto-zeroed buffer amplifier. When using this oscillator the
EXT pin has to be connected to V
SS
. At the OSC pin the
oscillator frequency is available.
If the EXT pin is connected to V
DD
the oscillator output
OSC is switched to a high-impedance state allowing the
user to feed an external clock signal to OSC.
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