EVAL-AD7986EBZ Analog Devices Inc, EVAL-AD7986EBZ Datasheet - Page 7

no-image

EVAL-AD7986EBZ

Manufacturer Part Number
EVAL-AD7986EBZ
Description
18-Bit A/D Converter Eval. Board
Manufacturer
Analog Devices Inc
Series
PulSAR®r
Datasheet

Specifications of EVAL-AD7986EBZ

Silicon Manufacturer
Analog Devices
Application Sub Type
ADC
Kit Application Type
Data Converter
Silicon Core Number
AD7986
Kit Contents
Board
Number Of Adc's
1
Number Of Bits
18
Sampling Rate (per Second)
2M
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
±VREF
Power (typ) @ Conditions
29mW @ 2MSPS
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7986
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 6. Pin Function Descriptions
Pin No.
1, 2
3, 4
5
6
7
8
9
10
11
12
13
14
15
Mnemonic
REF
REFGND
IN−
IN+
PDREF
VIO
SDO
DGND
DVDD
SCK
CNV
SDI
TURBO
Type
AI
AI
AI
AI
DI
P
DO
P
P
DI
DI
DI
DI
1
Description
Reference Output/Input Voltage.
When PDREF = low, the internal reference and buffer are enabled, producing 4.096 V on this pin.
When PDREF = high, the internal reference and buffer are disabled, allowing an externally supplied
voltage reference up to 5.0 V.
Decoupling is required with or without the internal reference and buffer. This pin is referred to the
REFGND pins and should be decoupled closely to the REFGND pins with a 10 µF capacitor.
Reference Input Analog Ground.
Differential Negative Analog Input.
Differential Positive Analog Input.
Internal Reference Power-Down Input.
When low, the internal reference is enabled.
When high, the internal reference is powered down and an external reference must be used.
Input/Output Interface Digital Power. Nominally at the same supply as the host interface
(1.8 V, 2.5 V, or 2.7 V).
Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK.
Digital Power Ground.
Digital Power. Nominally at 2.5 V.
Serial Data Clock Input. When the part is selected, the conversion result is shifted out by this clock.
Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions
and selects the interface mode of the part: chain mode or CS mode. In CS mode, the SDO pin is
enabled when CNV is low. In chain mode, the data should be read when CNV is high.
Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC as
follows:
Chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a data
input to daisy-chain the conversion results of two or more ADCs onto a single SDO line. The digital
data level on SDI is output on SDO with a delay of 18 SCK cycles.
CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV can
enable the serial output signals when low. If SDI or CNV is low when the conversion is complete, the
busy indicator feature is enabled.
Conversion Mode Selection.
When TURBO = high, the maximum throughput (2 MSPS) is achieved. The ADC does not power down
between conversions.
When TURBO = low, the maximum throughput is lower (1.5 MSPS). The ADC powers down between
conversions.
NOTES
1. THE EXPOSED PAD IS NOT CONNECTED
REFGND
REFGND
INTERNALLY. FOR INCREASED
RELIABILITY OF THE SOLDER JOINTS, IT
IS RECOMMENDED THAT THE PAD BE
SOLDERED TO THE SYSTEM
GROUND PLANE.
REF
REF
IN–
Figure 4. Pin Configuration
1
2
3
4
5
Rev. B | Page 7 of 28
(Not to Scale)
AD7986
TOP VIEW
PIN 1
INDICATOR
15 TURBO
14 SDI
13 CNV
12 SCK
11 DVDD
AD7986

Related parts for EVAL-AD7986EBZ