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參數資料
| 型號： | AD7866ARU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Dual 1 MSPS, 12-Bit, 2-Channel SAR ADC with Serial Interface |
| 中文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | MO-153AC, TSSOP-20 |
| 文件頁數： | 5/20頁 |
| 文件大小： | 304K |
| 代理商： | AD7866ARU |
REV. 0
AD7866
–5–
ORDERING GUIDE
Resolution
(Bits)
Package
Option
Model
Temperature Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
Evaluation Board
Package Description
AD7866ARU
AD7866BRU
EVAL-AD7866CB
1
EVAL-CONTROL BRD2
2
Controller Board
12
12
Thin Shrink SO (TSSOP)
Thin Shrink SO (TSSOP)
(TSSOP)
RU-20
RU-20
NOTES
1
This can be used as a stand-alone evaluation board or in conjunction with the evaluation board controller for evaluation/demonstration purposes.
2
This evaluation board controller is a complete unit, allowing a PC to control and communicate with all Analog Devices evaluation boards ending in the CB designators.
PIN FUNCTION DESCRIPTIONS
Pin No.
Mnemonic
Function
1
REF SELECT
Internal/External Reference Selection Pin. Logic Input. If this pin is tied to GND, the on-chip
2.5 V reference is used as the reference source for both ADC A and ADC B. In addition, pins V
REF
,
D
CAP
A, and D
CAP
B must be tied to decoupling capacitors. If the REF SELECT pin is tied to a
logic high, an external reference can be supplied to the AD7866 through the V
REF
pin, in which
case decoupling capacitors are required on D
CAP
A and D
CAP
B. However, if the V
REF
pin is tied to
AGND while REF SELECT is tied to a logic low, an individual external reference can be applied
to both ADC A and ADC B through pins D
CAP
A and D
CAP
B, respectively. See Reference section.
Decoupling capacitors are connected to these pins to decouple the reference buffer for each respective
ADC. The on-chip reference can be taken from these pins and applied externally to the rest of a
system. Depending on the polarity of the REF SELECT pin and the configuration of the V
REF
pin,
these pins can also be used to input a separate external reference to each ADC. The range of the
external reference is dependent on the analog input range selected. See Reference section.
Analog Ground. Ground reference point for all analog circuitry on the AD7866. All analog input
signals and any external reference signal should be referred to this AGND voltage. Both of these
pins should connect to the AGND plane of a system. The AGND and DGND voltages should
ideally be at the same potential and must not be more than 0.3 V apart even on a transient basis.
Analog Inputs of ADC B. Single-ended analog input channels. The input range on each channel is 0 V
to V
REF
or a 2
×
V
REF
range depending on the polarity of the RANGE pin upon the falling edge of
CS
.
Analog Inputs of ADC A. Single-ended analog input channels. The input range on each channel is 0 V
to V
REF
or a 2
×
V
REF
range depending on the polarity of the RANGE pin upon the falling edge of
CS
.
Reference Decoupling Pin and External Reference Selection Pin. This pin is connected to the inter-
nal reference and requires a decoupling capacitor. The nominal reference voltage is 2.5 V and this
appears at the pin; however, if the internal reference is to be used externally in a system, it must be
taken from either the D
CAP
A or D
CAP
B pins. This pin is also used in conjunction with the REF SELECT
pin when applying an external reference to the AD7866. See REF SELECT pin description.
2, 9
D
CAP
B, D
CAP
A
3, 8
AGND
4, 5
V
B2
,
V
B1
6, 7
V
A2
,
V
A1
10
V
REF
PIN CONFIGURATION
TOP VIEW
(Not to Scale)
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
AD7866
REF SELECT
A0
D
CAP
B
AGND
V
B2
V
B1
V
A2
V
A1
AGND
D
CAP
A
V
REF
CS
SCLK
V
DRIVE
D
OUT
B
D
OUT
A
DGND
DV
DD
AV
DD
RANGE
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