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參數(shù)資料
型號(hào)： ADN2850BCPZ250
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 28/28頁(yè)
文件大?。?/td> 0K
描述： IC DGTL RHEO DL 1024POS 16LFCSP
產(chǎn)品變化通告： Metal Edit Change 03/Feb/2012
標(biāo)準(zhǔn)包裝： 1
接片： 1024
電阻（歐姆）： 250k
電路數(shù)： 2
溫度系數(shù)： 標(biāo)準(zhǔn)值 35 ppm/°C
存儲(chǔ)器類(lèi)型： 非易失
接口： 4 線 SPI（芯片選擇）
電源電壓： 3 V ~ 5.5 V，±2.25 V ~ 2.75 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-VQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 16-LFCSP
包裝： 托盤(pán)
Data Sheet
ADN2850
Rev. E | Page 9 of 28
PIN 1
INDICATOR
1
SDO
2
GND
3
VSS
4
V1
11 WP
12 PR
10 VDD
9V2
5
W
1
6
B
1
7
B
2
8
W
2
1
5
C
L
K
1
6
S
D
I
1
4
R
D
Y
1
3
C
S
ADN2850
NOTES
1. THE EXPOSED PAD IS LEFT FLOATING
OR IS TIED TO VSS.
TOP VIEW
(Not to Scale)
(EXPOSED
PAD)
026
60-
105
Figure 5. Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
SDO
Serial Data Output. Serves readback and daisy-chain functions. Command 9 and Command 10 activate the SDO
output for the readback function, delayed by 24 or 25 clock pulses, depending on the clock polarity before and
after the data-word (see Figure 2 and Figure 3). In other commands, the SDO shifts out the previously loaded SDI
bit pattern, delayed by 24 or 25 clock pulses depending on the clock polarity (see Figure 2 and Figure 3). This
previously shifted out SDI can be used for daisy-chaining multiple devices. Whenever SDO is used, a pull-up
resistor in the range of 1 kΩ to 10 kΩ is needed.
2
GND
Ground Pin, Logic Ground Reference.
3
VSS
Negative Supply. Connect to 0 V for single-supply applications. If VSS is used in dual supply, it must be able to sink
2 mA for 15 ms when storing data to EEMEM.
4
V1
Log Output Voltage 1. Generates voltage from an internal diode configured transistor.
5
W1
Wiper terminal of RDAC1. ADDR (RDAC1) = 0x0.
6
B1
Terminal B of RDAC1.
7
B2
Terminal B of RDAC2.
8
W2
Wiper terminal of RDAC2. ADDR (RDAC2) = 0x1.
9
V2
Log Output Voltage 2. Generates voltage from an internal diode configured transistor.
10
VDD
Positive Power Supply.
11
A
WPE
Optional Write Protect. When active low,
A
WPE
A
prevents any changes to the present contents, except
A
PRE
A
strobe.
CMD_1 and COMD_8 refresh the RDAC register from EEMEM. Tie
A
WPE
A
to VDD, if not used.
12
A
PRE
Optional Hardware Override Preset. Refreshes the scratchpad register with current contents of the EEMEM
register. Factory default loads midscale until EEMEM is loaded with a new value by the user.
A
PRE
A
is activated
at the logic high transition. Tie
A
PRE
A
to VDD, if not used.
13
A
CSE
Serial Register Chip Select Active Low. Serial register operation takes place when
A
CSE
A
returns to logic high.
14
RDY
Ready. Active high open-drain output. Identifies completion of Instruction 2, Instruction 3, Instruction 8,
Instruction 9, Instruction 10, and
A
PRE
A
.
15
CLK
Serial Input Register Clock. Shifts in one bit at a time on positive clock edges.
16
SDI
Serial Data Input. Shifts in one bit at a time on positive clock CLK edges. MSB loads first.
EP
Exposed Pad. The exposed pad is left floating or is tied to VSS.
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