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参数资料
| 型号： | EVAL-AD5235SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5235 |
| 标准包装： | 1 |
| 主要目的： | 数字电位器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD5235 |
| 主要属性： | 2 沟道，1024 位置 |
| 次要属性： | SPI 接口 |
| 已供物品： | 板，CD |
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Data Sheet
AD5235
Rev. F | Page 21 of 32
Using CS to Re-Execute a Previous Command
Another subtle feature of the AD5235 is that a subsequent CS
strobe, without clock and data, repeats a previous command.
Using Additional Internal Nonvolatile EEMEM
The AD5235 contains additional user EEMEM registers for
storing any 16-bit data such as memory data for other components,
look-up tables, or system identification information. Table 9 pro-
vides an address map of the internal storage registers shown in the
functional block diagram (see Figure 1) as EEMEM1, EEMEM2,
and 26 bytes (13 addresses × 2 bytes each) of User EEMEM.
Table 9. EEMEM Address Map
EEMEM No.
Address
EEMEM Content for …
1
0000
RDAC11
2
0001
RDAC2
3
0010
USER12
4
0011
USER2
…
15
1110
USER13
16
1111
1
RDAC data stored in EEMEM locations is transferred to the corresponding
RDAC register at power-on, or when Instruction 1, Instruction 8, and PR are
executed.
2
USERx are internal nonvolatile EEMEM registers available to store and
retrieve constants and other 16-bit information using Instruction 3 and
Instruction 9, respectively.
3
Read only.
Calculating Actual End-to-End Terminal Resistance
The resistance tolerance is stored in the EEMEM register during
factory testing. The actual end-to-end resistance can, therefore,
be calculated, which is valuable for calibration, tolerance matching,
and precision applications. Note that this value is read only and
the RAB2 matches with RAB1, typically 0.1%.
The resistance tolerance in percentage is contained in the last
16 bits of data in EEMEM Register 15. The format is the sign
magnitude binary format with the MSB designate for sign
(0 = negative and 1 = positive), the next 7 MSB designate the
integer number, and the 8 LSB designate the decimal number
For example, if RAB_RATED = 250 k and the data in the SDO
shows XXXX XXXX 1001 1100 0000 1111, RAB_ACTUAL can be
calculated as follows:
MSB: 1 = positive
Next 7 LSB: 001 1100 = 28
8 LSB: 0000 1111 = 15 × 28 = 0.06
% tolerance = 28.06%
Therefore, RAB_ACTUAL = 320.15 k
RDAC STRUCTURE
The patent-pending RDAC contains multiple strings of equal
resistor segments with an array of analog switches that acts as
the wiper connection. The number of positions is the resolution of
the device. The AD5235 has 1024 connection points, allowing it to
provide better than 0.1% setability resolution. Figure 45 shows
an equivalent structure of the connections among the three
terminals of the RDAC. The SWA and SWB are always on, while
the switches, SW(0) to SW(2N 1), are on one at a time, depending
on the resistance position decoded from the data bits. Because
the switch is not ideal, there is a 50 wiper resistance, RW.
Wiper resistance is a function of supply voltage and temperature.
The lower the supply voltage or the higher the temperature, the
higher the resulting wiper resistance. Users should be aware of
the wiper resistance dynamics, if accurate prediction of the
output resistance is needed.
SW(1)
SW(0)
SWB
B
RS
SWA
SW(2N–1)
A
W
SW(2N–2)
RDAC
WIPER
REGISTER
AND
DECODER
RS = RAB/2N
RS
DIGITAL
CIRCUITRY
OMITTED FOR
CLARITY
02816-
044
Figure 45. Equivalent RDAC Structure
Table 10. Nominal Individual Segment Resistor Values
Device Resolution
25 k
250 k
1024-Step
24.4
244
Table 11. Calculating End-to-End Terminal Resistance
Bit
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Sign
Mag
Sign
26
25
24
23
22
21
20
.
21
22
23
24
25
26
27
28
7 Bits for Integer Number
Decimal
Point
8 Bits for Decimal Number
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| EVAL-AD5235SDZ | 制造商:Analog Devices 功能描述:Evaluation board |
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