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參數(shù)資料
| 型號(hào)： | WM2623 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Low Power 8-bit Serial Input DAC |
| 中文描述： | 低功耗8位串行輸入DAC |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 86K |
| 代理商： | WM2623 |
Production Data
WM2623
WOLFSON MICROELECTRONICS LTD
PD
Rev 1.0 October 2000
7
DEVICE DESCRIPTION
GENERAL FUNCTION
The WM2623 is an 8-bit, voltage output DAC operating from a single supply. The device uses a
resistor string network buffered with an op amp to convert 8-bit digital data to analogue voltage
levels (see Block Diagram). The output voltage is determined by the reference input voltage and
the input code according to the following relationship:
(
)
256
2
CODE
V
out
V
REFIN
=
INPUT
OUTPUT
(
V
1111
1111
)
256
255
2
REF
:
:
1000
0001
(
)
256
129
2
REF
V
1000
0000
(
)
REF
REF
V
V
=
256
128
2
0111
1111
(
)
256
127
2
REF
V
:
:
0000
0001
(
)
256
1
2
REF
V
0000
0000
0V
Table 1 Binary Code Table (0V to 2V
REF7
Output), Gain = 2
POWER ON RESET
An internal power-on-reset circuit resets the DAC register to all 0s on power-up.
BUFFER AMPLIFIER
The output buffer has a near rail-to-rail output with short circuit protection and can reliably drive a
2k
load with a 100pF load capacitance.
EXTERNAL REFERENCE
The reference voltage input is buffered which makes the DAC input resistance independent of
code. The REF pin has an input resistance of 10M
and an input capacitance of typically 5pF. The
reference voltage determines the DAC full-scale output.
SERIAL INTERFACE
Before writing any data to the WM2623, the device must first be enabled by setting CSB to low.
Then, a falling edge of FS starts shifting the data bit-per-bit (starting with the MSB) into the internal
register on the falling edges of SCLK. After 16 bits have been transferred, the next rising edge on
SCLK or FS causes the content of the shift register to be moved to the DAC latch which updates
the voltage output to the new level.
The serial interface of the device can be used in two basic modes:
four wire (with chip select)
three wire (without chip select)
Using the chip select pin CSB (four wire mode), it is possible to have more than one device
connected to the serial port of the data source (DSP or microcontroller). If there is no need to have
more than one device on the serial bus, CSB can be tied low.
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相關(guān)代理商/技術(shù)參數(shù) |
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| WM2623CD | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Low Power 8-bit Serial Input DAC |
| WM2623ID | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Low Power 8-bit Serial Input DAC |
| WM2623XAB WAF | 制造商:Texas Instruments 功能描述: |
| WM2625 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Low Power Dual 8-bit Serial Input DAC |
| WM2625CD | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Low Power Dual 8-bit Serial Input DAC |
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