EVAL-AD7866CB AD [Analog Devices], EVAL-AD7866CB Datasheet - Page 5

• Manufacturer Part Number: EVAL-AD7866CB
• Description: Dual 1 MSPS, 12-Bit, 2-Channel SAR ADC with Serial Interface
• Manufacturer: AD [Analog Devices]

Model
AD7866ARU
AD7866BRU
EVAL-AD7866CB
EVAL-CONTROL BRD2
NOTES
1
2
Pin No.
1
2, 9
3, 8
4, 5
6, 7
10
This can be used as a stand-alone evaluation board or in conjunction with the evaluation board controller for evaluation/demonstration purposes.
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.
Mnemonic
REF SELECT
D
AGND
V
V
V
B2
A2
REF
CAP
, V
, V
B, D
B1
A1
1
CAP
A
2
Temperature Range
–40°C to +85°C
–40°C to +85°C
Evaluation Board
Controller Board
Function
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
D
logic high, an external reference can be supplied to the AD7866 through the V
case decoupling capacitors are required on D
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
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
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
Analog Inputs of ADC A. Single-ended analog input channels. The input range on each channel is 0 V
to V
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
pin when applying an external reference to the AD7866. See REF SELECT pin description.
CAP
REF
REF
A, and D
or a 2 × V
or a 2 × V
PIN FUNCTION DESCRIPTIONS
CAP
REF SELECT
REF
REF
B must be tied to decoupling capacitors. If the REF SELECT pin is tied to a
PIN CONFIGURATION
range depending on the polarity of the RANGE pin upon the falling edge of CS.
range depending on the polarity of the RANGE pin upon the falling edge of CS.
D
D
CAP
AGND
AGND
ORDERING GUIDE
CAP
CAP
V
V
V
V
V
REF
Resolution
12
12
(Bits)
B2
B1
A2
A1
A or D
B
A
10
2
3
4
5
6
7
8
9
1
(Not to Scale)
TOP VIEW
AD7866
CAP
B pins. This pin is also used in conjunction with the REF SELECT
19
18
17
16
15
14
13
12
11
20
A0
CS
SCLK
DGND
RANGE
V
D
D
DV
AV
DRIVE
OUT
OUT
CAP
Package Description
Thin Shrink SO (TSSOP)
Thin Shrink SO (TSSOP)
(TSSOP)
DD
DD
CAP
B
A
A and D
A and D
CAP
CAP
B, respectively. See Reference section.
B. However, if the V
Package
Option
RU-20
RU-20
REF
REF
AD7866
pin is tied to
pin, in which
REF
pin,
REF
,