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參數(shù)資料
| 型號： | WM2637 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| 中文描述： | 雙路10位串行輸入電壓輸出DAC，帶有內(nèi)部參考 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 262K |
| 代理商： | WM2637 |
WM2637
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 1.0 July 99
7
DEVICE DESCRIPTION
GENERAL FUNCTION
The device uses a resistor string network buffered with an op amp to convert 10-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:
Output voltage =
(
)
1024
code
V
2
REF
INPUT
1111
OUTPUT
(
11
1111
)
1024
1023
V
2
REF
:
:
10
0000
0001
(
V
)
1024
513
2
REF
10
0000
0000
(
)
REF
REF
V
1024
)
512
V
2
=
01
1111
1111
(
1024
511
V
2
REF
:
:
00
0000
0001
(
)
1024
1
V
2
REF
0000
0000
0000
0V
Table 1 Binary Code Table (0V to 2VREF Output), Gain = 2
POWER ON RESET
An internal power-on-reset circuit resets the DAC registers 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.
SERIAL INTERFACE
When chip select (NCS) is low, the input data is read into a 16-bit shift register with the input data
clocked in most significant bit first. The falling edge of the SCLK input shifts the data into the input
register. After 16 bits have been transferred, the next rising edge on SCLK or NCS then transfers
the data to the DAC latch. When NCS is high, input data cannot be clocked into the input register
(see Table 2).
SERIAL CLOCK AND UPDATE RATE
Figure 1 shows the device timing. The maximum serial rate is:
1
min
WCL
min
WCH
+
The digital update rate is limited to an 800ns period, or 1.25MHz frequency. However, the DAC
settling time to 10 bits limits the update rate for large input step transitions.
f
SCLK
max =
MHz
20
t
t
=
SOFTWARE CONFIGURATION OPTIONS
The 16 bits of data can be transferred with the sequence shown in Table 2. D11-D2 contains the 10-bit data
word. D15-D12 hold the programmable options which are summarized Table 3
D15
R1
D14
SPD PWD
D13
D12
R0
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
x
D0
x
New DAC value or control register value
Table 2 Serial Word Format
相關(guān)PDF資料 |
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| WM2637CD | Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2637ID | Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2638 | Dual 12-Bit Serial Input Voltage Output DAC with Internal reference |
| WM2638CD | Dual 12-Bit Serial Input Voltage Output DAC with Internal reference |
| WM2638ID | TVS UNI 225W 6V PWRDI 123 SMD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WM2637CD | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2637ID | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2638 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 12-Bit Serial Input Voltage Output DAC with Internal reference |
| WM2638CD | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 12-Bit Serial Input Voltage Output DAC with Internal reference |
| WM2638ID | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 12-Bit Serial Input Voltage Output DAC with Internal reference |
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